This guide covers US federal income tax treatment of traditional IRA deductions reported on Form 1040. Roth IRA contributions and nondeductible contributions follow different rules. This matters for Australians and other expats who still file US returns.
We'll walk through four steps: check eligibility, calculate the deductible amount, report it on the right line, and keep the right records.
Key Takeaways
- A traditional IRA contribution can be fully, partly or not deductible.
- The IRA deduction is an adjustment to income on Schedule 1, not a Schedule A itemised deduction.
- Filing status, modified AGI, earned compensation and workplace-plan coverage drive the result.
- Confirm limits, thresholds and line numbers against current IRS instructions each year.
What an IRA Deduction Is and Which Contributions Qualify
What the deduction does
The IRA deduction is the deductible portion of a traditional IRA contribution. When you qualify, it lowers your adjusted gross income (AGI) and therefore your taxable income.
Contributing and deducting are separate events. Say you put money into a traditional IRA, but your income is too high and you're covered at work. You made a valid contribution, yet you may deduct only part of it, or none.
Traditional versus Roth
Traditional IRA contributions may be deductible. Roth contributions are made with after-tax money, and the IRS states that Roth contributions are not deductible, so they never appear as an IRA deduction on Form 1040.
Contribution limits are combined, though. For 2026, total contributions across all your traditional and Roth IRAs cannot exceed $7,500 (or $8,600 at age 50 or older), or your eligible compensation if lower. The deduction is tested separately.
Deductible versus nondeductible contributions
You can contribute to a traditional IRA without getting a deduction. In that case you file Form 8606 to record the after-tax basis, so you aren't taxed on it again when you withdraw.
Two limits are in play:
- Contribution limit: how much you may put in
- Deduction limit: how much of it you may deduct, which can never exceed what you actually contributed
Who Can Claim a Traditional IRA Deduction?
Earned compensation
You generally need compensation to contribute to a traditional IRA. Per Publication 590-A, qualifying compensation includes:
- Wages and salaries
- Net self-employment earnings (after the deductible half of self-employment tax and any retirement-plan deduction)
- Taxable alimony under instruments executed by December 31, 2018
- Taxable graduate fellowship stipends and nontaxable combat pay
Interest, dividends, rental income, pensions and annuities do not count.
Spousal IRAs help couples filing jointly. A working spouse's compensation can support a nonworking spouse's contribution. Each spouse has a separate IRA and limit, and combined contributions can't exceed joint compensation.
Age no longer limits traditional IRA contributions or the related deduction.
Workplace retirement-plan coverage
Being covered by a 401(k), 403(b) or similar plan doesn't stop you from contributing. It can reduce or eliminate the deduction. Check Box 13 ("Retirement plan") on your W-2. Defined benefit eligibility can count as coverage even if you don't earn a benefit.
For married couples, three situations produce different outcomes:
- You're covered: your own phaseout applies
- Only your spouse is covered: a higher phaseout range applies to you
- Neither is covered: no income-based limit
Filing status and modified AGI
These 2026 phaseout ranges come from IRS Notice 2025-67:
| Filing status and coverage | 2026 MAGI phaseout |
|---|---|
| Single or head of household, covered | $81,000–$91,000 |
| Married filing jointly, contributor covered | $129,000–$149,000 |
| Qualifying surviving spouse, covered | $129,000–$149,000 |
| Married filing jointly, only spouse covered | $242,000–$252,000 |
| Married filing separately, either covered | $0–$10,000 |
| Not covered, no covered spouse | No phaseout |
Separated spouses who lived apart all year are treated as single for this test.
Modified AGI isn't the AGI on your return. Start with AGI before the IRA deduction, then add back items such as student loan interest, foreign earned income exclusions and housing deductions. Worksheet 1-1 in Publication 590-A walks through it.
Full, partial or no deduction
Use Publication 590-A Worksheet 1-2 or the IRA Deduction Worksheet in the Form 1040 instructions. Within a phaseout range, the result is rounded up to the next $10. If the calculated amount is under $200 but above zero, you use $200.
The IRS's own 2025 example shows how coverage changes the result. A married couple, both aged 39, have $126,500 MAGI and each contribute $7,000. The covered spouse deducts $6,825. The uncovered spouse deducts $7,000. Total: $13,825.
Where Does the IRA Deduction Go on Form 1040?
The Schedule 1 path
For the 2025 return, the path is:
- Schedule 1, Part II, line 20 ("IRA deduction"), where you enter both spouses' combined deduction
- Schedule 1, line 26 (total adjustments)
- Form 1040, line 10
These lines were the same on the 2024 forms. Line numbers can shift between years, so check the current-year forms before filing.
Why Schedule A doesn't apply
The IRA deduction is an above-the-line adjustment. You don't need to itemise, and taking the standard deduction doesn't stop you claiming it. Schedule A is irrelevant here.
Full, partial and nondeductible amounts
Enter only the allowable amount on line 20. If the deduction is limited, the remainder of your contribution is nondeductible.
Nondeductible contributions go on Form 8606, which you file even if you have no other filing requirement. Per the Form 8606 instructions:
- Line 1 reports nondeductible contributions
- Line 2 brings in prior basis
- Line 14 shows remaining basis
Penalties apply: $50 for failing to file and $100 for overstating nondeductible contributions. Reasonable-cause relief may be available.
Multiple accounts and corrections
Add contributions across every traditional and Roth IRA, even at different custodians, when testing the annual limit. Before filing, confirm:
- Returned contributions: withdrawn by the return deadline (including extensions), with earnings, and no deduction claimed
- Recharacterisations: treated as made to the receiving IRA, so don't also deduct the original
- The tax year each contribution is designated for
Uncorrected excess contributions attract a 6% annual tax, reported on Form 5329.
Final review checklist
- Schedule 1 line 20 flows to line 26, then to Form 1040 line 10
- The same contribution isn't deducted twice
- Filing status and MAGI support the amount claimed
- Form 8606 is attached for any nondeductible portion
How to Calculate, Document and Claim the Deduction
Limits and deadlines
For 2026: $7,500 limit, $1,100 catch-up for those 50 and older, shared across all your IRAs. The ordinary deadline for 2025 contributions is April 15, 2026, and filing extensions don't move it. For January 1 to April 15 contributions, tell the custodian which year the money is for. Otherwise it may be reported for the current year.
Calculating the allowable deduction
The worksheet combines compensation, filing status, MAGI, coverage and contribution amount. The result can't exceed your contribution or your compensation. You may have made a larger permitted contribution than you're allowed to deduct.
Forms 5498, 8606 and 1099-R
- Form 5498: prepared by your custodian, reports contributions and year-end value. It's for your records and isn't attached to your return.
- Form 8606: yours to file for nondeductible contributions, Roth conversions and distributions when you have basis.
- Form 1099-R: reports distributions, including conversions and returned contributions with earnings.
Reconciling with your custodian
Compare account statements, contribution confirmations and each contribution's tax-year designation against your records. Form 5498 for regular contributions is generally due to the IRS by May 31, so it often arrives after you file. If it conflicts with your records, contact the custodian and don't guess.
Keeping basis records
Keep prior Forms 8606, contribution confirmations, deduction worksheets and records of returned or recharacterised contributions until all distributions are made. Form 5498 doesn't replace your own records. Resolve gaps before claiming a deduction.
Common IRA Deduction Mistakes and Special Situations
Common filing errors
- Deducting Roth contributions
- Treating the full contribution limit as automatically deductible
- Ignoring workplace-plan coverage
- Using the wrong MAGI threshold or filing-status range
- Claiming the same contribution twice
- Claiming the same contribution twice
- Skipping Form 8606 when required
- Missing an excess contribution or carrying forward the wrong basis
These errors can cost you later, often years after the original mistake.
Cross-border considerations
Don't assume the Form 1040 rules fit your situation if you live outside the US. Under Publication 519, a nonresident alien may qualify only with taxable compensation effectively connected with a US trade or business.
Form 1040-NR filers can't use a spouse's earned income, and excluded foreign earned income isn't IRA compensation.
State treatment, treaties and foreign retirement arrangements need separate analysis. Some states follow US treaties and others don't. Don't infer any of it from federal treatment.
For complex cross-border or business-related cases, VJM Global prepares Form 1040 and 1040-NR returns through U.S.-compliant professionals. Advice should always rest on your individual facts.
Frequently Asked Questions
Where does the IRA deduction go on Form 1040?
On the 2025 return, enter it on Schedule 1, line 20. It flows to Schedule 1 line 26, then Form 1040 line 10. Verify line numbers against the current-year forms.
Which IRA contributions are tax-deductible?
Qualifying traditional IRA contributions may be fully or partly deductible, depending on income, filing status and workplace coverage. Roth contributions are not deductible.
Is an IRA deduction the same as a 401(k) deduction?
No. Traditional 401(k) deferrals generally never appear in Form 1040 taxable income. An IRA deduction is claimed separately through Schedule 1, and eligibility rules differ.
What is an IRA deduction on a tax return?
It's the allowable portion of a traditional IRA contribution, claimed as an adjustment to income. It reduces AGI and is not an itemised deduction.
What is the difference between Form 5498 and Form 8606, and do I need to include Form 5498 with my return?
Form 5498 is your custodian's report of contributions and account value, and you don't attach it. Form 8606 is filed by you to report nondeductible contributions and track IRA basis.
