Introduction: 2024 Schedule 1 IRA Deduction and Line 20
Form 1040 Schedule 1, Part II, line 20 is where you report the allowable deduction for eligible traditional IRA contributions for tax year 2024. Many filers assume that contributing to an IRA means deducting the whole amount. It doesn't.
This guide is written for Australia-based taxpayers with US federal filing obligations. It covers US federal reporting only. Australian tax, residency, treaty and foreign-retirement-account issues need separate assessment.
The 2024 annual limit is $7,000 ($8,000 at age 50 or older), but deductibility turns on your income, filing status and workplace-plan coverage. Below, you'll find the rules, the calculation, a step-by-step walkthrough, and the mistakes that trip up cross-border filers.
Key Takeaways
- A traditional IRA contribution is not automatically deductible; compensation, filing status, MAGI and plan coverage decide the outcome.
- Roth contributions never go on line 20, and SEP or SIMPLE deductions belong on line 16.
- Your deduction may be full, partial or zero; nondeductible amounts go on Form 8606.
- Use the 2024 IRA Deduction Worksheet and keep contribution and coverage records.
What Is Schedule 1 Line 20 for 2024?
Line 20 on Schedule 1 (Part II) is labelled "IRA deduction." It is an adjustment to income, not an itemised deduction. You can claim it whether or not you itemise.
How line 20 flows to Form 1040
The amount on line 20 is combined with the other adjustments on line 26. That total carries to Form 1040 line 10. Form 1040 line 11 then subtracts adjustments from total income, while standard or itemised deductions are separate on line 12.
What belongs on line 20 and what does not
| Item | Where it goes |
|---|---|
| Traditional IRA deduction | Schedule 1, line 20 |
| Nondeductible traditional contributions | Form 8606, Part I |
| Regular Roth contributions | Not deductible; custodian reports on Form 5498 box 10 |
| Self-employed SEP, SIMPLE and qualified plans | Schedule 1, line 16 |
Check these line numbers against the official 2024 Schedule 1 before you file.
Who Can Claim the 2024 IRA Deduction?
Eligibility for a deductible traditional IRA contribution
Compensation. You need taxable compensation to contribute. Qualifying items include:
- Wages, salaries and commissions
- Self-employment income
- Taxable alimony or separate maintenance received
- Nontaxable combat pay
- Taxable non-tuition fellowship or stipend payments
Rent, interest, dividends, pensions, annuities and deferred compensation from a past year don't count. Neither do excluded foreign earnings or housing costs.
Contribution limit. Regular contributions across all your traditional and Roth IRAs combined cannot exceed $7,000, or $8,000 if you are 50 or older, or your taxable compensation if lower.
Workplace coverage. Coverage generally depends on account allocations in a defined-contribution plan, or eligibility to participate in a defined-benefit plan. Form W-2 box 13 ("Retirement plan") should indicate coverage. Lack of vesting doesn't avoid coverage.
2024 MAGI bands
| Filing status and coverage | Full deduction | Partial | None |
|---|---|---|---|
| Single/HOH; you are covered | $77,000 or less | $77,000 to $87,000 | $87,000 or more |
| MFJ; you are covered | $123,000 or less | $123,000 to $143,000 | $143,000 or more |
| MFJ; you are not covered, spouse is | $230,000 or less | $230,000 to $240,000 | $240,000 or more |
| MFS, lived with spouse; either covered | None | Under $10,000 | $10,000 or more |
| Neither spouse covered | No MAGI limit | n/a | n/a |
If you filed separately but lived apart from your spouse all year, use single-status treatment. Married filing separately alone creates no phaseout when neither spouse is covered.
Spousal IRAs
On a joint return, you can contribute for a spouse with little or no income, based on combined compensation. Each spouse owns a separate IRA. Check each spouse's coverage separately, because the bands differ.
Foreign retirement arrangements and Australia-based filers
Australian superannuation, foreign pensions and US employer plans are classified differently. Whether superannuation counts as workplace coverage for IRA purposes is unsettled, so confirm the treatment with a cross-border tax adviser before you claim. An ABA analysis notes the treaty doesn't address US taxation of superannuation contributions or earnings, and distribution classification is unclear.
Other cross-border points:
- The foreign earned income exclusion (maximum $126,500 for 2024) is added back when computing deduction MAGI.
- Excluded foreign earnings still don't count as compensation for contribution purposes.
- Treaty positions, FBAR (aggregate foreign accounts above $10,000) and Form 8938 operate separately from line 20.
How to Calculate the Amount for Line 20
Use the 2024 IRS deduction worksheet
Gather your filing status, MAGI, workplace-plan coverage, total traditional IRA contributions, compensation and spouse details. Then work through:
- Contributions and compensation: apply the combined traditional/Roth cap and strip out the Roth portion.
- MAGI: Publication 590-A Worksheet 1-1 starts with AGI before the IRA deduction. Add back student loan interest, foreign earned income and housing exclusions, foreign housing deduction, and certain excluded savings-bond interest and adoption benefits.
- Deduction: use Worksheet 1-2 in Publication 590-A, or the "IRA Deduction Worksheet - Schedule 1, Line 20" in the 2024 Form 1040 instructions. Covered filers who use Form 2555 are referred to Publication 590-A.
The reduced-limit result rounds up to the next $10. If the result is below $200 but above zero, enter $200.
Contribution limits, timing and allocation
- Deadline: 15 April 2025 for most taxpayers. Filing extensions don't extend it.
- Overseas filers: the automatic extension to 16 June 2025 doesn't push the contribution deadline.
- Designation: for a contribution made between January and April, tell the custodian it is for 2024. Otherwise it may be reported for the year received.
- Allocation: the annual limit applies across all your IRAs, so a $7,000 cap split between traditional and Roth is not $7,000 each.
- Check the records: confirm the custodian recorded the right tax year and the right spouse's account.
Partial and nondeductible contributions
The deductible amount can be lower than what you contributed. Only the allowable portion goes on line 20.
File Form 8606, Part I for the nondeductible remainder so basis is tracked and the funds aren't taxed again on withdrawal. Missing a required Form 8606 carries a $50 penalty unless you show reasonable cause.
Hypothetical example, no deduction (based on IRS Publication 590-A): A married couple, both 39, file jointly. One spouse earns $45,500 and is covered by a workplace plan. The other has no compensation and isn't covered. Each contributes $7,000.
Combined MAGI is $232,500. The covered spouse gets no deduction because MAGI exceeds $143,000. The other spouse's deduction is calculated separately, using the $230,000 to $240,000 band.
Hypothetical example, full deduction: A spouse who isn't covered and isn't subject to a phaseout can deduct the entire $7,000 contribution, and Worksheet 1-2 isn't needed.
How to Complete 2024 Schedule 1 Line 20
Gather the correct documents
- 2024 Form 1040 and Schedule 1
- Custodian confirmations or Form 5498
- Workplace-plan information (W-2 box 13)
- Compensation records
- Prior Forms 8606
- Your completed IRA deduction worksheet
Form 5498 can arrive after the filing deadline. Rely on custodian statements and confirm the reporting rather than waiting. Custodians' correction deadline for 5498 information is 2 June 2025, not 31 May.
Enter and transfer the deduction
- Calculate the allowable deduction using the worksheet.
- Enter only that amount on Schedule 1, line 20.
- Total your adjustments on line 26.
- Carry line 26 to Form 1040 line 10.
- If you have nondeductible contributions, complete Form 8606.
Exclude Roth contributions, amounts claimed elsewhere, and nondeductible contributions.
Quick field guide: Schedule 1 line 20 (IRA deduction) → line 26 (total adjustments) → Form 1040 line 10.
Paper filing, software and amended returns
Tax software may calculate the deduction through an interview. Still review the contribution year, filing status, plan coverage and the final Schedule 1.
Paper filers should confirm that:
- The worksheet matches Schedule 1 line 20
- Line 26 carries correctly to Form 1040 line 10
- Form 8606 is attached if required
If you omitted a deductible contribution, file Form 1040-X with a corrected Schedule 1 and any changed forms. The refund window is generally 3 years from filing the original return or 2 years from paying the tax, whichever is later. Software can e-file Form 1040-X.
Common Errors and Documentation for Australia-Based US Filers
Common line 20 mistakes
- Entering Roth contributions as deductible
- Using the wrong tax-year form
- Claiming the full contribution despite a phaseout
- Overlooking a spouse's workplace-plan coverage
- Confusing an IRA deduction with a self-employed retirement deduction (line 16)
- Skipping Form 8606 for nondeductible contributions
Foreign income, a foreign retirement plan or superannuation may need separate professional analysis rather than direct entry into the IRA calculation.
Official sources and professional review
Work from the 2024 Schedule 1, the Form 1040 instructions, Publication 590-A, Publication 590-B where relevant, Form 8606 and its instructions, and current IRS contribution and deduction-limit pages.
For Australia-based filers, those cross-border details make careful documentation essential. VJM Global's tax compliance and advisory team, including US-compliant professionals, can assist with complex cross-border documentation and review. This article is general information, not personalised tax advice, and no deduction outcome is guaranteed.
Taxpayers with foreign income, multiple retirement accounts, prior nondeductible contributions or uncertain plan coverage should consult a qualified tax professional before filing.
Frequently Asked Questions
What is Form 1040 Schedule 1 line 20?
Line 20 reports the allowable deduction for eligible traditional IRA contributions. The amount flows through line 26 of Schedule 1 to Form 1040 line 10.
Is an IRA contribution deductible on Schedule 1?
Traditional IRA contributions may be deductible; Roth contributions are not. Your income, filing status and workplace-plan coverage determine whether the result is full, partial or zero.
Do Roth IRA contributions go on Schedule 1 line 20?
No. Roth contributions are made with after-tax funds and aren't claimed as a traditional IRA deduction on line 20.
What if only part of my IRA contribution is deductible?
Enter only the allowable amount on line 20. Report the nondeductible portion on Form 8606 and track your basis.
Can I make a 2024 IRA contribution after the end of 2024?
Yes, until 15 April 2025 for most taxpayers. Tell the custodian the contribution is for 2024. Filing extensions, including the overseas extension, don't extend this date.
Does an Australian superannuation or foreign retirement plan affect my US IRA deduction?
Foreign arrangements can be classified differently for US purposes. Review them separately from the line 20 calculation, ideally with a cross-border tax professional.
