11 legit ways to reduce taxable income this year

By Tom, CPA · Updated October 27, 2026

Part of: Easy Tax Strategies

TL;DR: Taxable income falls when money goes into pre-tax accounts (401(k), HSA, deductible IRA, FSA), when you claim above-the-line deductions, and when capital losses offset gains. Here are 11 legitimate levers with 2026 limits and what each is worth at your bracket.

Educational only, not tax, legal, or investment advice. Examples are illustrations, not predictions. Rules and limits change; verify current figures and talk to a qualified professional about your situation.

"How do I reduce my taxable income?" is usually asked in December, in a slight panic, by someone who has just seen a pay stub. Good news: there are real answers. Better news: none of them involve buying a truck you do not need. The key idea is that your tax is computed on taxable income, which is gross income minus exclusions, above-the-line adjustments and either the standard or itemized deduction. Every lever below works on one of those pieces.

Figures are 2026 amounts from IRS Rev. Proc. 2025-32, Notice 2025-67 and Rev. Proc. 2025-19, checked October 27, 2026. For the full ranked list of easy moves, see easy tax strategies that actually work.

CPA Warning Label: Lowering taxable income is not the same as lowering spending money; most of these moves lock dollars in accounts with withdrawal rules.

Which levers fit which situation

Not every lever is available to everyone, and the order you pull them matters. A quick sorting guide:

A practical sequence for most employees: capture any employer match first, then fill the HSA, then decide between more 401(k) and an IRA based on fees, fund choices and the Roth question. The goal is not to reduce taxable income at all costs. Pre-tax dollars come out taxed later, so for people in low brackets now, a Roth contribution can be the better long-run choice even though it does nothing for this year's taxable income.

Moves that do not reduce taxable income

Some popular ideas sound like they belong on this list but do not:

• Paying off the mortgage early. Principal is never deductible, and extra payments reduce future interest, which may reduce a deduction you already were not using.
• Buying a bigger house for the deduction. With the standard deduction at $32,200 for joint filers in 2026, many homeowners get no benefit from mortgage interest at all.
• Converting to Roth. A Roth conversion increases taxable income this year in exchange for tax-free growth later. That can be smart, but it is the opposite of this list.
• Prepaying next year's bills. Personal expenses are not deductible no matter when you pay them.

If you are near a cliff, such as an ACA subsidy threshold or a credit phaseout, reducing AGI can be worth more than your marginal rate suggests. That is where a few thousand dollars of extra 401(k) or HSA money earns its keep.

Pre-tax 401k

1. Pre-tax 401(k), 403(b), 457(b) or TSP deferrals. The 2026 employee limit is $24,500, plus an $8,000 catch-up at 50+ or $11,250 at ages 60 to 63. Pre-tax deferrals are excluded from wages in box 1 of your W-2, so they never hit taxable income. Many plans let you change the rate any time, so a December paycheck can still carry a bigger deferral if you have not hit the limit.

2. A governmental 457(b) on top. If your employer offers both a 403(b) and a governmental 457(b), the limits are separate, which can double the deferral space.

HSA

3. Health savings account. With HSA-eligible coverage, you can contribute up to $4,400 (self-only) or $8,750 (family) for 2026, plus $1,000 at 55+. Starting in 2026, bronze and catastrophic marketplace plans are treated as HSA-compatible, which widens eligibility. Payroll contributions skip FICA too; contributions made directly are deducted on Form 8889, and you can make them up to the April filing deadline. More in HSA vs. taxable vs. Roth.

Traditional IRA

4. Deductible traditional IRA. The 2026 limit is $7,500 ($8,600 at 50+). If you are covered by a workplace plan, the deduction phases out between $81,000 and $91,000 of modified AGI for single filers and $129,000 to $149,000 for joint filers. If you are not covered but your spouse is, the range is $242,000 to $252,000. Not covered at all? Deductible at any income.

5. Self-employed retirement plans. A SEP IRA or solo 401(k) can shelter far more than an IRA when you have net self-employment income.

FSA

6. Health FSA. Up to $3,400 for 2026, excluded from income and FICA. Election is made at open enrollment, so this is a next-year lever.

7. Dependent care assistance. Up to $7,500 starting in 2026 if your employer adopts the higher limit. 8. Commuter benefits. Transit and parking fringe benefits can be excluded up to $340 per month each in 2026.

Business deductions

9. Ordinary and necessary business expenses. If you have a real side business, its expenses reduce net profit, which cuts both income tax and the 15.3% self-employment tax. Half of self-employment tax is also an above-the-line deduction. The business must have a profit motive; a hobby does not qualify.

10. Above-the-line personal deductions. Student loan interest (up to $2,500, phased out above $85,000 MAGI single and $175,000 joint in 2026), the $350 educator expense deduction, and the newer temporary deductions for qualified tips, overtime premium pay and car loan interest, each with its own caps and phaseouts.

Harvesting losses

11. Tax-loss harvesting. Realized capital losses offset capital gains, then up to $3,000 of ordinary income per year, with the rest carried forward. Buying a substantially identical security within 30 days before or after the sale triggers the wash sale rule and defers the loss.

Illustration: Married couple, $180,000 of wages, 2026, standard deduction. Baseline taxable income: $180,000 − $32,200 = $147,800 (22% bracket, which runs to $211,400). They add $6,000 to pre-tax 401(k)s, $8,750 to a family HSA through payroll, and harvest $3,000 of net capital loss. Taxable income falls by $17,750 to $130,050. Federal income tax saved: $17,750 × 22% = $3,905, plus $8,750 × 7.65% = $669.38 of FICA on the payroll HSA. Total about $4,574.

Watch the interactions: lowering AGI can also help with phaseouts and the 3.8% net investment income tax (see NIIT guide), and landlords should read what rental income is taxable and NIIT on rental income.