How Traditional IRA Deductions Work

Contributing to a Traditional IRA means depositing money into the account, subject to the annual contribution limit and the earned-compensation requirement. Deducting that contribution means reporting it on Schedule 1 of Form 1040 to reduce your taxable income. These are separate steps: you must contribute by the deadline to get the deduction, but contributing does not guarantee a deduction.

When a contribution is fully deductible, your taxable income falls by the contribution amount, and you pay tax on that money only when you withdraw it in retirement. When a contribution is nondeductible, you pay tax now, and that after-tax amount is your IRA basis — protected from double taxation if you track it correctly.

The term "active participant" refers to any worker who is eligible to participate in an employer-sponsored retirement plan, such as a 401(k), 403(b), SEP-IRA, or SIMPLE IRA, for any part of the plan year. Being covered does not mean you actually contribute — merely being eligible to participate is sufficient. Your W-2 Box 13 shows a checkmark in the "Retirement plan" box if you were an active participant.

If you are covered, the deductibility of your Traditional IRA contribution depends on your MAGI. If you are not covered but your spouse is, a spousal phaseout applies at higher MAGI. If neither you nor your spouse is covered by a workplace plan, your Traditional IRA contribution is fully deductible regardless of income.

When the contributing taxpayer is covered by a workplace plan, the deduction phases out for Single and Head-of-Household filers between $81,000 and $91,000 MAGI. For Married Filing Jointly (covered taxpayer), the phaseout runs from $129,000 to $149,000.

When only the spouse is covered (the taxpayer is not), the Married Filing Jointly phaseout runs from $242,000 to $252,000. Married Filing Separately individuals who lived with their spouse face a very narrow phaseout from $0 to $10,000. All figures are for 2026 per IRS Rev. Proc. 2025-32.

When your MAGI falls within the phaseout range, you receive a partial deduction calculated by the IRS Publication 590-A worksheet. The basic formula: deductible fraction = (ceiling − MAGI) ÷ phaseout range width. Multiply that fraction by your contribution to get the deductible portion. Rounding rules and a $200 minimum apply.

For example, if you are Single, covered, and your MAGI is $86,000 in 2026: phaseout range is $10,000. Your MAGI is $5,000 above the floor ($81,000). Deductible fraction = (91,000 − 86,000) ÷ 10,000 = 50%. On a $7,500 contribution, $3,750 is deductible and $3,750 is nondeductible. This is an educational estimate; use the IRS worksheet for a precise figure.

Every time you make a nondeductible Traditional IRA contribution, you add to your IRA basis. IRA basis is the after-tax portion of your Traditional IRA balance — money you already paid federal income tax on. When you withdraw from a Traditional IRA that has basis, the IRS calculates the taxable and nontaxable portions using the pro-rata rule.

Form 8606 — Nondeductible IRAs — is how you report and track IRA basis with the IRS. You file it in any year you make a nondeductible Traditional IRA contribution, take a distribution when you have existing basis, or perform a Roth conversion. Failing to file it can result in the IRS treating all distributions as fully taxable, even the after-tax portion.

The pro-rata rule applies when you have a mix of pre-tax and after-tax amounts in any Traditional, SEP, or SIMPLE IRA accounts. You cannot choose to withdraw only the nondeductible (after-tax) basis first. Instead, each distribution is treated as coming proportionally from pre-tax and after-tax amounts, using the ratio of total IRA basis to total IRA fair market value.

This rule is especially important for taxpayers who want to execute a "backdoor Roth" strategy (making a nondeductible Traditional contribution and then converting it). If you have other pre-tax IRA balances, the pro-rata rule will apply to the conversion, making a portion taxable.

A deduction reduces your taxable income by the contribution amount; the actual tax savings equals the contribution multiplied by your marginal tax rate. A credit, by contrast, reduces your tax bill dollar for dollar. The Traditional IRA deduction is a deduction, not a credit. A 22% marginal rate taxpayer who deducts a $7,500 contribution saves $1,650 in federal tax — not $7,500.

There is a separate Retirement Savings Contributions Credit (Saver's Credit) that lower- and middle-income taxpayers may claim in addition to or instead of a deduction. The credit has its own income limits and is computed on Form 8880.

Use the IRA calculator to estimate your 2026 deductible and nondeductible Traditional IRA contribution amounts based on your income, filing status, and workplace plan coverage.