How to reduce taxable income on a high W-2 salary in 2026

To reduce taxable income on a high W-2 salary, send more of your pay into pre-tax accounts before December 31, 2026. A 401(k) takes up to $24,500 for 2026, and a family HSA takes $8,750.

Deferred pay, harvested losses and bunched gifts can add more. Two familiar moves work less well for high earners from 2026: catch-up contributions, which must now be Roth above $150,000 of wages, and itemized deductions.

401(k), 403(b) or 457(b)	$24,500 of your pay
Catch-up at 50 or older	$8,000, or $11,250 at ages 60 to 63
HSA	$4,400 self-only, $8,750 family
Health FSA	$3,400
Dependent care FSA	$7,500 per return
Transit and parking	$340 a month each
Capital losses against salary	$3,000 a year
Figures checked	October 26, 2026

How can I legally reduce my taxable income?

You legally reduce taxable income by keeping pay out of box 1 of your W-2, then by timing losses and deductions. These are the moves that still work on a high salary in 2026.

1. Fill your 401(k). You can defer $24,500 of 2026 pay into a 401(k), 403(b) or governmental 457(b) plan. Raise your rate now so the last paychecks of the year reach the limit.
2. Fund an HSA through payroll. With a high-deductible health plan, you can put in $4,400 for self-only coverage or $8,750 for family coverage, plus $1,000 at 55 or older. Payroll contributions also skip Social Security and Medicare tax.
3. Use your other pre-tax benefits. A health FSA takes $3,400 for 2026, and a dependent care FSA takes $7,500 per return. Transit and parking benefits each take $340 a month. You set most of these at open enrollment.
4. Defer salary or a bonus. A deferred compensation plan can move pay to a later year, with no dollar limit in the tax code. Most plans need your election for 2027 pay by December 31, 2026.
5. Harvest investment losses. Selling at a loss offsets your capital gains, then up to $3,000 of salary a year, and the rest carries forward. See how tax-loss harvesting works, including the wash sale rule.
6. Bunch your giving. If your deductions are near the $32,200 joint standard deduction, put two or more years of gifts into a donor-advised fund at once. Give stock held more than one year: you deduct its market value and never pay tax on the gain.
7. Open a plan for a side business. Net self-employment earnings can fund a SEP-IRA or a solo 401(k). The employer contribution can reach about 20% of those earnings, within $72,000 for 2026.

One limit catches people with a second job or a side business. The $24,500 deferral limit is per person across 401(k) and 403(b) plans, not per plan. If your day job's plan is full, a solo 401(k) can take only the employer contribution.

Which moves work less well for high earners in 2026?

Three familiar moves cut less tax on a high salary in 2026.

1. Catch-up contributions. From 2026, if your 2025 wages from the employer that sponsors the plan topped $150,000, your catch-ups must go in as Roth. They grow tax-free but no longer lower this year's taxable income.
2. Traditional IRA contributions. If a workplace plan covers you, the deduction phases out between $81,000 and $91,000 of modified AGI for a single filer. On a joint return, the range is $129,000 to $149,000. A backdoor Roth gets money into a Roth IRA, but it does not cut taxable income either.
3. Itemized deductions. In the 37% bracket, the law cuts itemized deductions by 2/37, so each dollar saves at most 35 cents. That bracket starts above $768,700 of taxable income on a joint return, or $640,600 for a single filer. Gifts also count only above 0.5% of AGI, as the 2026 charitable rules explain.

How much does a 401(k) contribution reduce your taxes?

Each dollar you put into a pre-tax 401(k) lowers your taxable income by a dollar, so it saves tax at your top rate.

Take a single filer with a $400,000 salary and no other deductions. After the $16,100 standard deduction, $383,900 is taxable, inside the 35% bracket that runs from $256,225 to $640,600. Deferring $24,500 cuts federal income tax by $8,575. Your state tax may fall too.

Social Security and Medicare tax still apply to a 401(k) deferral. An HSA funded through payroll skips both income tax and those payroll taxes.

When do you have to act?

Most of these moves must be done by December 31, 2026, because they run through payroll or count in the year they happen.

When	What has to happen
December 31, 2026	Last paycheck for 401(k) and HSA payroll deferrals
December 31, 2026	Usual deadline to elect deferred pay for 2027
December 31, 2026	Losses harvested and gifts made
Your open enrollment	FSA and commuter amounts for 2027
April 15, 2027	Last day for direct HSA contributions for 2026

What should you do now?

• Check your year-to-date 401(k) deferrals on your latest pay stub, and raise your rate to reach $24,500 by December 31.
• If you have a high-deductible health plan, top up your HSA through payroll before the year ends.
• At open enrollment, set your 2027 health FSA, dependent care FSA and commuter amounts.
• Decide by December 31 whether to defer part of your 2027 salary or bonus.
• Review your taxable accounts for losses, and make planned gifts, before December 31.
• If your 2025 wages topped $150,000, expect your 2026 catch-up contributions to be Roth.

For more, see our guide to tax planning for high earners.

Sources.

• IRS, 2026 limits for 401(k) plans and IRAs, with IRA deduction phase-outs
• IRS, Notice 2025-67, 2026 retirement plan limits and the Roth catch-up wage threshold
• IRS, Retirement topics: catch-up contributions
• IRS, How much salary can you defer if you are in more than one plan?
• IRS, Rev. Proc. 2025-19, 2026 HSA limits
• IRS Publication 969, Health Savings Accounts and other tax-favored health plans
• IRS, Rev. Proc. 2025-32, 2026 brackets, standard deduction, FSA and commuter limits
• 26 U.S.C. § 129, dependent care assistance
• 26 U.S.C. § 1211, limit on capital losses
• 26 U.S.C. § 68, the 2/37 limit on itemized deductions
• 26 U.S.C. § 3121(v)(1), 401(k) deferrals as Social Security and Medicare wages
• IRS Publication 560, Retirement Plans for Small Business