The tax code offers a range of accounts built specifically to make saving for retirement, healthcare, and education cheaper after tax. Despite serving different goals, they share a common design: contributions are often deductible or made pre-tax, growth inside the account is deferred or entirely tax-free, and withdrawals are tax-free when used for the purpose the account was created for. Knowing how each type works, and what its contribution limits and withdrawal rules look like, is central to building a sound long-term financial plan rather than an afterthought at filing time. Because contribution limits are adjusted for inflation every year, any specific dollar figure in this note reflects the 2025 limits and should be checked against current IRS guidance before relying on it.
Employer-Sponsored Retirement Plans
Defined contribution plans – 401(k), 403(b), and 457(b) plans – let employees defer part of their salary into an individual account, either pre-tax through a traditional plan or after-tax through a Roth version, with the employer often adding a matching contribution. For 2025 the employee elective deferral limit across these plans is $23,500, with an extra $7,500 catch-up contribution available at age 50 and an enhanced $11,250 catch-up for ages 60 through 63. The overall cap on combined employee and employer contributions to one of these accounts is the lesser of $70,000 or 100% of compensation. A defined benefit plan works differently: it promises a fixed payout in retirement based on salary and years of service, with the employer bearing the investment risk rather than the employee.
Traditional and Roth IRAs
Individual Retirement Accounts let anyone save independently of an employer plan. Contributions to a Traditional IRA are often deductible, reducing taxable income in the contribution year, with growth deferred and withdrawals taxed as ordinary income in retirement; the deduction phases out once income crosses set thresholds if the taxpayer is also covered by a workplace plan. A Roth IRA works in reverse: contributions are made with after-tax dollars and are never deductible, but qualified withdrawals in retirement, including all the growth, are entirely tax-free, and eligibility to contribute at all phases out at higher income levels. For 2025 the combined contribution limit across Traditional and Roth IRAs is $7,000, plus a $1,000 catch-up at age 50.
Options for the Self-Employed and Small Business
A SEP IRA lets an employer, including a self-employed individual, contribute up to 25% of compensation to each eligible employee’s account, funded entirely by the employer with no employee deferrals. A SIMPLE IRA, aimed at smaller employers, allows employee deferrals alongside a mandatory employer contribution, with a lower elective deferral limit than a standard 401(k). A Solo 401(k) suits a self-employed person with no employees other than a spouse, allowing contributions in both the employee and employer capacity, which lets a sole proprietor reach the same overall defined contribution limit as a large-company 401(k) participant.
When Retirement Money Can Be Withdrawn
Distributions from most retirement accounts become penalty-free at age 59½, though pre-tax withdrawals are still taxed as ordinary income. Taking money out earlier generally triggers a 10% additional tax, unless an exception applies – death or disability, a properly structured series of substantially equal periodic payments, unreimbursed medical expenses above a set share of AGI, a limited amount for a first home purchase, qualified education costs, birth or adoption expenses, an IRS levy, or separation from service at 55 or later under certain plans. On the other end of the timeline, Required Minimum Distributions force withdrawals to begin once the account owner reaches the age set by current law, with a steep penalty for missing one; Roth IRAs are the exception, carrying no lifetime RMD for the original owner.
Health Savings Accounts and Flexible Spending Accounts
An HSA, available to anyone enrolled in a qualifying high-deductible health plan, offers a genuine triple tax advantage: contributions are deductible, growth inside the account is tax-free, and withdrawals for qualified medical expenses are tax-free at any age. Unlike an FSA, unused HSA funds roll over indefinitely and can even be used for non-medical purposes after age 65, taxed as ordinary income at that point similar to a traditional retirement account – making the HSA a legitimate secondary retirement vehicle. An FSA, by contrast, is funded with pre-tax payroll deductions but is generally subject to a use-it-or-lose-it rule, so unused funds are typically forfeited at the end of the plan year unless the employer offers a grace period or limited carryover.
Education Savings: 529 Plans and Coverdell ESAs
A Section 529 plan is not federally deductible on contribution, but it offers tax-free growth and tax-free withdrawals for qualified education costs such as tuition, fees, books, and certain room and board, with many states offering their own deduction or credit for contributions. A Coverdell Education Savings Account works similarly but with much lower contribution limits and income restrictions on who can contribute, in exchange for a broader definition of qualified expenses that can include elementary and secondary school costs; Coverdell funds generally must be used before the beneficiary turns 30 to avoid tax and penalty.
Timing Strategies Across These Accounts
Because the core benefit of nearly every one of these accounts is tax deferral or tax exemption on growth, timing decisions compound over the years rather than mattering only once. Contributing to an HSA early in the year captures more months of tax-free growth, and the ability to fund it up until the following year’s filing deadline creates a useful window to reduce the prior year’s taxable income after year-end finances are clearer. FSA elections require careful estimation of the coming year’s expenses given the forfeiture risk, while 529 and Coverdell withdrawals must line up with the same year’s qualified expenses and be coordinated with education tax credits to avoid double-counting the same costs.
Quick revision summary
Tax-advantaged accounts generally offer deductible or pre-tax contributions, tax-deferred or tax-free growth, and tax-free withdrawals when used for their intended purpose.
401(k), 403(b), and 457(b) plans allow employee deferrals plus employer contributions, subject to annual limits that include extra catch-up amounts for older workers.
Traditional IRA contributions may be deductible with taxable withdrawals later; Roth IRA contributions are after-tax with tax-free qualified withdrawals.
SEP IRAs, SIMPLE IRAs, and Solo 401(k)s give the self-employed and small employers their own retirement plan options with different contribution structures.
Withdrawals before age 59½ generally trigger a 10% penalty unless an exception applies, and Required Minimum Distributions force withdrawals to begin later in life except from Roth IRAs.
HSAs offer a triple tax advantage and roll over indefinitely; FSAs are pre-tax but generally subject to a use-it-or-lose-it rule.
529 plans and Coverdell ESAs both offer tax-free growth and tax-free withdrawals for qualified education expenses, with Coverdell allowing a broader range of expenses at lower contribution limits.
Wages are not the only way an employer pays for services. Equity awards and non-cash fringe benefits routinely make up a meaningful part of a compensation package, and each carries its own tax rules covering when income is recognized, how it is characterized, and what payroll taxes apply. Getting the timing wrong on stock compensation can mean paying tax years earlier than necessary, or triggering the Alternative Minimum Tax unexpectedly, while missing an available fringe benefit exclusion can mean paying tax on something the law never required to be taxed at all. This note covers the major forms of equity compensation, how fringe benefits are taxed by default, and the main categories the Code chooses to exclude.
Restricted Stock: RSAs and RSUs
A Restricted Stock Award grants actual shares up front, subject to forfeiture until a vesting condition such as continued employment is met; once the restrictions lapse, the fair market value of the shares at that moment is taxed as ordinary wage income. An employee can instead make a Section 83(b) election within thirty days of the grant to be taxed on the value at grant rather than at vesting, a bet that pays off if the stock appreciates substantially before vesting, because the appreciation then becomes capital gain instead of ordinary income. A Restricted Stock Unit is a promise to deliver shares later rather than an immediate grant of stock, and it is taxed the same way RSAs are taxed without an 83(b) election – as ordinary income when the shares are actually delivered at vesting, with the holding period for any later gain beginning on that delivery date.
Stock Options: ISOs and NQSOs
Non-qualified stock options are the more common and less restricted type: when the option is exercised, the difference between the market value of the stock and the exercise price – the bargain element – is taxed immediately as ordinary income and treated as wages for payroll tax purposes, and any further movement in the stock’s value is capital gain or loss from that point forward. Incentive stock options receive more favorable treatment but require meeting strict conditions: exercising an ISO does not trigger regular income tax, though the bargain element does count as a preference item for the Alternative Minimum Tax. If the employee holds the shares for at least two years from grant and one year from exercise, the entire gain on eventual sale is taxed as long-term capital gain; falling short of either holding period turns the exercise-date bargain element into ordinary income after all.
Stock Appreciation Rights and Employee Stock Purchase Plans
A Stock Appreciation Right pays out the increase in a company’s stock value without requiring the employee to buy anything, and the payout – whether cash or stock – is taxed as ordinary wage income in the year it is received. An Employee Stock Purchase Plan lets employees buy company stock at a discount through payroll deductions; meeting the same two-year-from-grant and one-year-from-purchase holding periods that apply to ISOs converts the discount into ordinary income while the remaining gain is long-term capital gain, and missing either period pushes the discount into ordinary income at the time of sale instead.
How Fringe Benefits Are Taxed by Default
The default rule for any fringe benefit received for services performed is that it counts as taxable compensation, valued at its fair market value, unless a specific Code provision excludes it or the employee pays full value for it. A taxable fringe benefit must be reported on the employee’s Form W-2 as wages, and is generally subject to the same payroll taxes as cash pay. Because several exclusions exist specifically to help ordinary employees rather than executives, many of them come with nondiscrimination rules that deny the exclusion to highly compensated or key employees if a benefit plan disproportionately favors them – the rank-and-file keep the tax-free treatment even when a plan fails that test for its most senior participants.
Health, Retirement, and Convenience Benefits
Employer-provided health coverage, contributions to health flexible spending accounts, health reimbursement arrangements, and HSAs are generally excluded from income, as is the value of an on-site gym used mainly by employees and their families – though an employer-paid off-site fitness membership is fully taxable. Employer contributions to a qualified retirement plan such as a 401(k) are excluded from current income, and a set dollar amount of employer-provided group-term life insurance is excluded as well, with coverage above that amount becoming taxable. Working condition benefits – items that would have been deductible if the employee bought them personally – qualified transportation benefits up to set monthly limits, and no-additional-cost services like unsold airline seats are all excludable under their own specific rules.
Education, Family, and Development Benefits
A capped amount of employer-provided educational assistance is excluded from income each year regardless of whether the coursework is job-related, and qualified tuition reductions for employees of educational institutions are excluded under a separate provision. Dependent care assistance provided through a qualified plan is excludable up to a set annual limit, and qualified adoption assistance is excluded from income tax even though it remains subject to Social Security and Medicare tax. Employers can generally deduct the cost of providing these benefits, though the deduction rules and dollar limits differ benefit by benefit.
Timing Choices That Affect the Tax Bill
Because so much of this area turns on timing, planning decisions matter. Exercising an NQSO later defers the ordinary income it creates but leaves the eventual gain exposed to market risk in the meantime, while exercising an ISO avoids regular tax at exercise but can still create an AMT liability that needs to be planned for. Making an 83(b) election on restricted stock is a deliberate bet that locks in ordinary income at a low grant-date value in exchange for capital gain treatment on later appreciation. On the fringe benefit side, choosing pre-tax options in a cafeteria plan and contributing to a healthcare or dependent care flexible spending account are straightforward ways to convert what would otherwise be taxable spending into tax-free spending, subject to any use-it-or-lose-it deadline the plan imposes.
Quick revision summary
RSAs and RSUs are taxed as ordinary income when restrictions lapse or shares are delivered, unless an 83(b) election shifts RSA taxation to the grant date.
NQSOs are taxed as ordinary income on the bargain element at exercise; ISOs avoid regular tax at exercise but can trigger AMT and require specific holding periods for full capital gain treatment.
SARs are taxed as ordinary income when exercised; ESPP discounts are taxed as ordinary income unless the ISO-style holding periods are met.
Fringe benefits are taxable by default at fair market value unless a specific Code section excludes them, and several exclusions carry nondiscrimination rules protecting rank-and-file employees.
Common excluded benefits include employer health coverage, retirement plan contributions, a capped amount of group-term life insurance, transportation benefits, and on-site gym use.
Education assistance, tuition reduction, dependent care assistance, and adoption assistance are excludable up to set limits, each under its own Code provision.
Filing an accurate return is only half of individual taxation; the other half is planning ahead of time so that the return reflects the lowest tax liability the law legitimately allows. Tax planning is not a single trick but a discipline built on three interacting concepts: controlling when income and deductions are recognized, moving income toward taxpayers who face lower rates, and converting income from a heavily taxed form into a more lightly taxed one. Each concept comes with real limits imposed by the Internal Revenue Code and by doctrines the courts have developed specifically to stop abuse, so effective planning means understanding both the strategy and its boundaries.
The Goal of Tax Planning
The purpose of individual tax planning is to legally minimize tax liability over time, not merely in the current filing year. A plan that saves tax today but creates a larger liability in a future year, or that runs afoul of the law, is not good planning. Because individual taxation touches income sources, deductions, credits, investment decisions, retirement savings, and even estate considerations, effective planning requires understanding how these pieces interact rather than treating each tax return as an isolated event.
Timing: Deferring Income and Accelerating Deductions
Timing strategies manage when income is recognized and when deductions are claimed. Deferring income – for example through pre-tax contributions to a traditional 401(k) or IRA, or through an installment sale where gain is recognized as payments are received – postpones the related tax and can be especially valuable if the taxpayer expects a lower marginal rate in a future year. The opposite move, accelerating deductions, makes sense when a taxpayer expects to be in a higher bracket this year than in future years; bunching charitable contributions or prepaying certain deductible expenses into the current year captures the deduction while it is worth the most.
The Limits on Timing
Timing strategies are not unlimited. The constructive receipt doctrine treats income as taxable once it is made available without substantial restriction, even if the taxpayer chooses not to collect it, which closes off simple tricks like leaving a check uncashed. Deductions are similarly bound by rules about when the underlying expense is treated as incurred, such as the economic performance requirement for certain accrued costs. Tax law also frequently sets its own recognition rules for specific transactions, narrowing how much flexibility a timing strategy can actually provide.
Shifting Income Within the Same Tax System
Income shifting moves income from a taxpayer in a higher bracket to one in a lower bracket, most often within a family. Employing a relative in a family business at a reasonable wage for real work, or gifting income-producing property such as dividend stock to an adult child in a lower bracket, are both common approaches, and certain trusts can be structured to shift the taxation of income to a lower-bracket beneficiary. These strategies are constrained by several rules: the kiddie tax taxes a child’s unearned income above a threshold at the parent’s rate; the assignment of income doctrine taxes income to whoever actually earned it or owns the underlying asset, regardless of where the money is directed; and the IRS scrutinizes related-party transactions to confirm they reflect real economic activity rather than a paper shift designed only to save tax.
Shifting Income Across Jurisdictions
A parallel strategy moves income from a higher-tax jurisdiction to a lower-tax one, whether that means changing state residency or working and investing abroad. Establishing residency in a state without an income tax requires more than a change of mailing address – it requires genuinely relocating one’s life. For U.S. citizens, worldwide income remains subject to U.S. tax regardless of where it is earned, so mechanisms like the Foreign Earned Income Exclusion offer only partial relief, and both offshore structures and cross-border planning face heavy reporting requirements and anti-avoidance rules aimed squarely at artificial shifting.
Converting the Character of Income
Conversion changes the tax character of income or a deduction into a more favorably taxed form. The clearest example is holding a capital asset for more than a year so that its gain qualifies for the lower long-term capital gains rates instead of ordinary rates. Investing in municipal bonds converts otherwise taxable interest into income exempt from federal tax, and contributing to a Health Savings Account converts pre-tax dollars into tax-free spending on qualified medical care, since the contribution is deductible, the growth is tax-free, and qualified withdrawals are tax-free as well.
Why These Strategies Have Real Boundaries
Every conversion strategy comes with conditions: capital gain treatment requires meeting the holding-period test, interest on debt used to buy or carry tax-exempt bonds is generally not deductible, and tax law changes regularly enough that a conversion strategy that works today may be curtailed by future legislation. The common thread across timing, shifting, and conversion is that none of them is a loophole – each operates within rules Congress deliberately built into the Code, and each is checked by a doctrine or limitation designed to prevent it from being pushed past its intended purpose.
Quick revision summary
Individual tax planning aims to legally minimize tax liability over time, not just in the current year.
Timing strategies defer income or accelerate deductions, but are limited by doctrines like constructive receipt and rules like the economic performance test.
Income shifting moves income to a lower-bracket taxpayer, most often within a family, but is limited by the kiddie tax and the assignment of income doctrine.
Shifting income across jurisdictions is limited by residency rules and, for U.S. citizens, worldwide income taxation regardless of where it is earned.
Conversion changes income into a more favorably taxed form, such as long-term capital gains, tax-exempt municipal bond interest, or HSA-funded medical spending.
Every planning strategy operates within specific legal conditions and limitations, and none of them override the underlying tax law.
Once taxable income has been determined, two more steps remain before a taxpayer knows what they actually owe. First, the tax rate schedules are applied to that income, with long-term capital gains and qualified dividends taxed under their own, generally lower rate structure, and a handful of additional taxes layered on top for specific situations. Second, tax credits are subtracted directly from the resulting liability, dollar for dollar, before the return is reconciled against what was already paid through withholding or estimated payments. This note walks through that computation, the additional taxes that can apply, and the difference between nonrefundable and refundable credits.
Computing Tax on Ordinary Income and Capital Gains
Ordinary income – wages, interest, business profits, and short-term capital gains – is taxed first, filling the lower brackets before any income is taxed at a higher marginal rate. Long-term capital gains and qualified dividends are then stacked on top of that ordinary income and taxed under a separate, preferential rate schedule that tops out well below the highest ordinary rate. Because the capital gains bracket depends on where total income lands after ordinary income is counted first, a taxpayer whose ordinary income alone pushes them into a higher bracket will also see more of their capital gains taxed at a higher capital gains rate. A few categories of gain fall outside the standard 0/15/20 percent structure and carry their own maximum rates, including gain on qualified small business stock, gains from collectibles, and unrecaptured real estate depreciation gain.
The Kiddie Tax
The kiddie tax targets a child’s unearned income – interest, dividends, and capital gains – above a set threshold, taxing the excess at the parent’s marginal rate rather than the child’s. It exists specifically to stop parents from shifting investment assets into a child’s name purely to have the income taxed at the child’s lower bracket. Depending on the family’s circumstances, the child may file a separate return reporting this income, or in narrower cases the parent may elect to report the child’s interest and dividends directly on the parent’s own return instead.
Additional Taxes Beyond the Basic Calculation
Several taxes sit alongside the regular income tax computation rather than replacing it. The Alternative Minimum Tax recalculates taxable income by adding back a list of deductions and preference items, then applies a separate rate structure; if that alternative calculation exceeds the regular tax, the difference is owed on top. Self-employment tax covers both the employee and employer shares of Social Security and Medicare tax for anyone working for themselves, calculated on net self-employment earnings, with half of the amount paid deductible as an adjustment to gross income. An Additional Medicare Tax applies to wages and self-employment income once it crosses a filing-status-based threshold, and a Net Investment Income Tax applies at a flat rate to investment income once total income crosses a similar threshold.
How Nonrefundable Credits Work
A nonrefundable credit can reduce tax liability down to zero but never below zero – any credit left over once the liability hits zero is simply lost rather than refunded. Common nonrefundable credits include the Child and Dependent Care Credit, which offsets a percentage of work-related childcare costs; the Lifetime Learning Credit, available for an unlimited number of years for tuition and related education expenses; the Retirement Savings Contributions Credit for lower-income taxpayers who contribute to a retirement account; the Foreign Tax Credit, which prevents double taxation on income already taxed by another country; the General Business Credit, an umbrella for numerous smaller business incentive credits; and the Adoption Credit for qualified adoption expenses.
How Refundable Credits Work
A refundable credit can reduce liability below zero, with the excess paid to the taxpayer as part of their refund, which makes these credits function as direct financial support rather than purely as an offset to tax owed. The Earned Income Tax Credit supplements the earnings of low-to-moderate income workers based on income and number of qualifying children. A significant portion of the Child Tax Credit is refundable as the Additional Child Tax Credit. The American Opportunity Tax Credit for the first four years of higher education is partially refundable. Excess Social Security tax withheld across multiple employers is treated as a refundable credit, and the Premium Tax Credit helps eligible households afford Marketplace health insurance, whether taken in advance or claimed at filing.
From Tax Liability to Tax Due or Refund
Tax liability is the total amount legally owed for the year once every tax, including capital gains tax, AMT, and NIIT, has been added and every credit subtracted. That figure is then compared against the payments already made during the year through wage withholding and any estimated tax payments. If liability exceeds what was paid, the taxpayer owes the difference; if payments exceed liability, the taxpayer receives the difference back as a refund. The liability calculation and the due-or-refund reconciliation are two distinct steps, and confusing them is a common source of error when working through a return by hand.
Estimated Taxes and Underpayment Penalties
Taxpayers who expect to owe a meaningful amount of tax and whose withholding will not cover a safe-harbor percentage of either the current or prior year’s liability generally must make estimated tax payments, typically in four installments spread across the year. This obligation most often falls on the self-employed, investors with significant unearned income, and retirees whose income is not subject to automatic withholding. Paying too little during the year, whether through withholding or estimated payments, can trigger an underpayment penalty calculated on the shortfall for the period it remained unpaid, though certain exceptions – such as a very small underpayment or no tax liability in the prior year – can avoid the penalty.
Quick revision summary
Ordinary income fills the lower brackets first, and long-term capital gains and qualified dividends are then stacked on top and taxed under their own, generally lower rate schedule.
The kiddie tax taxes a child’s unearned income above a threshold at the parent’s rate to prevent income-shifting.
AMT, self-employment tax, Additional Medicare Tax, and the Net Investment Income Tax can all add to liability beyond the basic income tax calculation.
Nonrefundable credits reduce tax liability to zero but not below; refundable credits can reduce liability below zero and generate a refund.
Common nonrefundable credits include the Child and Dependent Care Credit, Lifetime Learning Credit, Saver’s Credit, Foreign Tax Credit, and General Business Credit.
Common refundable credits include the Earned Income Tax Credit, the Additional Child Tax Credit, and the partially refundable American Opportunity Tax Credit.
Underpaying tax during the year through withholding and estimated payments can trigger a penalty unless a safe-harbor exception applies.
Gross income is only the starting point of a tax return, not the number the tax is actually calculated on. Congress allows a series of adjustments and deductions that narrow gross income down to Adjusted Gross Income and then to Taxable Income, reflecting both fairness – it would be unreasonable to tax a business on its revenue without recognizing its costs – and deliberate policy choices, such as encouraging retirement savings or charitable giving. This note explains the difference between above-the-line adjustments and below-the-line deductions, walks through the most common items in each category, and covers the choice between the standard deduction and itemizing.
From Gross Income to Taxable Income
The path from gross income to taxable income runs through two stages. First, specific adjustments under IRC Section 62 are subtracted directly from gross income to produce Adjusted Gross Income, or AGI. Because these adjustments appeared above the AGI line on older paper tax forms, they are commonly called above-the-line deductions. Second, either the standard deduction or itemized deductions – both defined in Section 63 – are subtracted from AGI to arrive at taxable income, the figure the tax tables and brackets are actually applied to.
Why Above-the-Line Adjustments Are Especially Valuable
Adjustments to gross income are generally more useful to a taxpayer than an equivalent itemized deduction, because AGI is used as the benchmark for a long list of other tax provisions. Many credits phase out as AGI rises, and several itemized deductions are themselves limited by a percentage of AGI, so lowering AGI first can unlock or increase other tax benefits down the return. This cascading effect is why adjustments are worth understanding on their own, separate from the deductions that come later.
Common Above-the-Line Adjustments
Section 62(a) lists a defined set of adjustments. Self-employed taxpayers can deduct the ordinary and necessary expenses of running their trade or business. Eligible taxpayers can deduct contributions made to a traditional IRA, subject to income and coverage limits, and can deduct interest paid on qualified student loans up to an annual cap. Contributions to a Health Savings Account are deductible for taxpayers enrolled in a high-deductible health plan. Self-employed individuals may also deduct one-half of the self-employment tax they pay, which partially equalizes their tax burden with that of an employee whose employer covers half of payroll tax. A narrow adjustment for moving expenses survives only for active-duty military members relocating under orders, since the general moving expense deduction was suspended for other taxpayers.
The Standard Deduction
The standard deduction is a fixed dollar amount set each year by filing status, designed to simplify filing for taxpayers whose actual deductible expenses are modest. Taxpayers who are age 65 or older, or blind, receive an additional standard deduction amount, and a taxpayer who qualifies for both gets two additional amounts stacked on the base figure. The standard deduction available to a taxpayer who can be claimed as someone else’s dependent is more limited than the deduction available to an independent filer.
Itemized Deductions
Itemizing lets a taxpayer deduct actual qualifying expenses instead of the flat standard amount, and makes sense once those expenses exceed the standard deduction. Medical expenses are deductible only to the extent they exceed a set percentage of AGI, so a large medical bill is worth far more as a deduction than a small one. State and local taxes, including income or sales tax plus property tax, are deductible but capped at a fixed annual dollar limit regardless of how much was actually paid. Home mortgage interest on acquisition debt up to a set dollar limit is deductible, and investment interest is deductible up to the amount of net investment income for the year. Charitable contributions to a qualifying public charity are deductible up to a set percentage of AGI for cash gifts, with lower limits for property and certain other charities. Casualty and theft losses on personal property are now deductible only when they arise from a federally declared disaster, and even then only above a floor and a further percentage-of-AGI threshold.
Choosing Between the Standard Deduction and Itemizing
A taxpayer totals every qualifying itemized expense and compares that total to the standard deduction for their filing status, then claims whichever figure is larger – the two options cannot be combined. Taxpayers with a mortgage, high state and local taxes, large medical bills, or substantial charitable giving are the ones most likely to come out ahead by itemizing; a taxpayer with none of those tends to do better with the standard deduction, since it requires no documentation and rarely leaves money on the table.
Personal Exemptions and the Qualified Business Income Deduction
Personal and dependency exemptions – fixed amounts once deductible for the taxpayer, spouse, and each dependent – were suspended under current law, with the increased standard deduction and expanded child tax credit intended to offset their loss. Separately, eligible owners of sole proprietorships, partnerships, and S corporations may claim the Qualified Business Income deduction, worth up to 20% of qualified business income. Although it is technically listed among the Section 62 adjustments, the QBI deduction is calculated through its own, more complex set of rules and effectively provides a further reduction to taxable income beyond AGI.
Quick revision summary
Above-the-line adjustments under Section 62 reduce gross income to AGI; the standard deduction or itemized deductions under Section 63 then reduce AGI to taxable income.
Adjustments are especially valuable because AGI is the benchmark many other credits, deductions, and phase-outs are measured against.
Common adjustments include business expenses, traditional IRA contributions, student loan interest, HSA contributions, and one-half of self-employment tax.
The standard deduction is a fixed amount by filing status, increased for taxpayers who are 65 or older or blind, and reduced for dependents.
Itemized deductions – medical expenses above an AGI floor, capped state and local taxes, mortgage and investment interest, charitable gifts, and disaster-related casualty losses – are claimed only when they exceed the standard deduction.
The Qualified Business Income deduction lets eligible pass-through business owners deduct up to 20% of qualified business income, on top of the standard or itemized deduction.
