Are Pension Contributions Tax Deductible? IRA, 401(k), and Self-Employed

Yes, most pension and retirement plan contributions are tax deductible, but the mechanism depends on who is putting money in and into what kind of account. Employee contributions to a traditional 401(k), 403(b), or governmental 457(b) are excluded from your taxable wages before payroll runs, so you get the tax break automatically without claiming a deduction. Traditional IRA contributions are deducted on your tax return. Employer contributions to qualified plans are deductible as a business expense. Roth contributions are the one clear exception: no upfront deduction, with the benefit deferred to tax-free withdrawals later.

Workplace Pre-Tax Contributions

If you defer part of your salary into a traditional 401(k), 403(b), or governmental 457(b), the money is taken out before your employer calculates federal income tax withholding. You never “deduct” these contributions because they never appear as taxable income to begin with. On your W-2, Box 1 (taxable wages) is already reduced by the amount you deferred.¹

One thing that catches people off guard: pre-tax 401(k) deferrals still count as wages for Social Security and Medicare. Your employer withholds FICA on your full compensation, so Box 3 and Box 5 on the W-2 will be higher than Box 1.²

For 2026, the employee deferral limit is $24,500. If you are 50 or older, a catch-up contribution of $8,000 brings your ceiling to $32,500. Participants aged 60 through 63 can use an enhanced catch-up of $11,250 instead, for a total of $35,750.³

Traditional IRA Deductions

A Traditional IRA contribution is claimed as an above-the-line deduction on Schedule 1 of Form 1040, which reduces your adjusted gross income whether you itemize or take the standard deduction.⁴ The contribution limit for 2026 is $7,500, or $8,600 if you are 50 or older.³

Whether that contribution is actually deductible depends on two things: whether you or your spouse is covered by a workplace retirement plan, and your income. If neither spouse has workplace coverage, the full contribution is deductible at any income level.⁵

If you are covered by a workplace plan, the deduction phases out within these 2026 modified adjusted gross income (MAGI) ranges:

Single filers: phase-out between $81,000 and $91,000.
Married filing jointly, contributing spouse covered: phase-out between $129,000 and $149,000.
Not covered, but married to someone who is: phase-out between $242,000 and $252,000.
Married filing separately, covered by a plan: phase-out between $0 and $10,000, which effectively wipes out the deduction for most people in this status.

These figures are adjusted annually for inflation.³

You can still contribute to a Traditional IRA when your income is above the phase-out range. The contribution just is not deductible. In that case, file Form 8606 to track your basis so the non-deductible amount is not taxed again when you withdraw it.⁶

Roth Contributions Are Not Deductible

Roth contributions, whether to a Roth 401(k) or a Roth IRA, are made with after-tax money and never produce a deduction. The trade-off is that qualified withdrawals in retirement, including all growth, come out tax-free.

Roth 401(k) contributions have no income cap, but Roth IRA eligibility phases out for 2026 between $153,000 and $168,000 of MAGI for single filers and between $242,000 and $252,000 for married couples filing jointly.³

Employer Contributions

Businesses that sponsor a retirement plan can deduct their contributions as an ordinary business expense under IRC Section 404. This covers matching contributions, profit-sharing allocations, and funding for defined benefit pensions.⁷

For defined contribution plans, the employer deduction is capped at 25% of total compensation paid to plan participants during the year. Employee elective deferrals do not count against this ceiling. For defined benefit plans, the deductible amount is based on actuarial funding calculations.⁷

Non-deductible employer contributions carry a 10% excise tax each year until corrected.⁸ Separately, the total that can go into any one participant’s defined contribution account from all sources in 2026 is $72,000, or 100% of compensation if lower, under the Section 415 annual additions limit. Catch-up contributions are not counted against that cap.⁹

Self-Employed Plans

When you work for yourself, you fill both roles: employer and employee. That lets you contribute on both sides and deduct more than someone in a single role.

Solo 401(k)

As the employee, you can defer up to $24,500 for 2026, plus catch-up amounts if eligible, and take the deduction on your personal return. As the employer, you can add a profit-sharing contribution of up to 25% of net adjusted self-employment earnings, deducted as a business expense.¹⁰

SEP IRA

A Simplified Employee Pension IRA allows contributions of up to 25% of employee compensation, capped at $72,000 for 2026.¹¹ Only employer-side contributions are permitted, with no elective deferral option.

SIMPLE IRA

The standard SIMPLE IRA deferral limit for 2026 is $17,000, with a $4,000 catch-up for participants 50 and older and a $5,250 catch-up for those aged 60 through 63. Some SIMPLE plans meeting additional SECURE 2.0 requirements allow a slightly higher deferral of $18,100.³

The Circular Calculation

Your maximum deductible contribution depends on your net self-employment earnings, but those earnings are calculated after subtracting the contribution itself and half your self-employment tax. Because each number depends on the other, a stated 25% employer rate works out to roughly 20% of the owner’s net earnings in practice. Use the worksheets in IRS Publication 560 to run the math.¹⁰ The self-employed retirement deduction lands on Schedule 1 of Form 1040 as an above-the-line adjustment.⁴

Contribution Deadlines

Miss the deadline and you lose the deduction for that tax year.

Traditional and Roth IRA contributions can be made up to your tax return filing deadline, not including extensions. For most people, that means April 15 of the following year. You designate the tax year when you make the contribution.¹²

Employee 401(k) deferrals generally have to come out of wages paid during the calendar year. You cannot go back and defer pay you already received. Under SECURE 2.0, a self-employed person starting a brand-new Solo 401(k) in their first year can elect to defer prior-year net earnings as late as the tax return due date without extensions.¹³

Employer contributions, including matching and profit-sharing, can be made and deducted for the prior tax year as long as the money reaches the plan by the due date of the employer’s tax return, including extensions. A calendar-year corporation on extension could have until mid-October to fund and deduct.¹³

If You Contribute Too Much

Excess amounts in an IRA are hit with a 6% excise tax for every year the money stays in the account. You can avoid the penalty by withdrawing the excess and any earnings on it before your tax return due date, including extensions.¹⁴

For 401(k) plans, the fix is tighter. Excess deferrals and their earnings have to be distributed to you by April 15 of the following year, and filing an extension does not extend that deadline. Miss it and the excess gets taxed twice, once when deferred and again when withdrawn.¹⁵

For employers, contributions above the Section 404 deductible limit face the 10% excise tax on the non-deductible portion each year until corrected.⁸

How to Report Retirement Contributions on Your Return

For employees in a workplace plan, your W-2 does most of the work. Pre-tax deferrals appear in Box 12 with a letter code: D for a 401(k), E for a 403(b), S for a SIMPLE IRA. These amounts are already stripped from Box 1, so you do not claim any additional deduction.¹

Check Box 13. If the “Retirement plan” indicator is marked, you are considered covered for the year, which turns on the Traditional IRA phase-out rules above. Ask your employer for a corrected W-2 if the box is wrong.¹

Traditional IRA deductions go on Line 20 of Schedule 1 (Form 1040). If any part of your IRA contribution is non-deductible, file Form 8606 to record the basis. Skipping this step means paying tax on the same money twice.⁶ Self-employed plan deductions also land on Schedule 1, on the dedicated line for self-employed SEP, SIMPLE, and qualified plans, using the Publication 560 worksheets to derive the amount from your Schedule C or Schedule F income.¹⁰

State Income Tax

All of the rules above are federal. Most states with an income tax follow the federal treatment of retirement contributions, but some limit or disallow deductions the federal code permits. Check your state’s conformity rules before assuming the same deduction carries through to your state return.

1
Internal Revenue Service. Instructions for Form W-2 and Wage and Tax Statements
2
Internal Revenue Service. Are Retirement Plan Contributions Subject to Withholding for FICA, Medicare, or Federal Income Tax
3
Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
4
Internal Revenue Service. 2025 Schedule 1 (Form 1040)
5
Internal Revenue Service. IRA Deduction Limits
6
Internal Revenue Service. Instructions for Form 8606 (2025)
7
Office of the Law Revision Counsel. 26 USC 404 – Deduction for Contributions of an Employer to an Employees Trust or Annuity Plan
8
Office of the Law Revision Counsel. 26 USC 4972 – Tax on Nondeductible Contributions to Qualified Employer Plans
9
Internal Revenue Service. Notice 2025-67 – 2026 Amounts Relating to Retirement Plans and IRAs
10
Internal Revenue Service. Publication 560 – Retirement Plans for Small Business
11
Internal Revenue Service. SEP Contribution Limits (Including Grandfathered SARSEPs)
12
Internal Revenue Service. Traditional and Roth IRAs
13
Internal Revenue Service. Issue Snapshot – Deductibility of Employer Contributions to a 401(k) Plan Made After the End of the Tax Year
14
Internal Revenue Service. Retirement Topics – IRA Contribution Limits
15
Internal Revenue Service. Consequences to a Participant Who Makes Excess Deferrals to a 401(k) Plan