Dates trip people up, so here is the split. A return filed in 2026 covers tax year 2025. A tax year 2026 return is filed in 2027. The 2026 Form 1040 is still a draft marked "DRAFT - NOT FOR FILING", so the line numbers below come from the 2025 form and instructions.
This guide covers U.S. federal reporting. If you live in Australia, separate Australian obligations probably apply, which we flag at the end.
Key Takeaways
- Report the gross IRA distribution on line 4a and the taxable amount on line 4b.
- Check Form 1099-R for the gross amount, taxable amount and distribution code.
- Use Form 8606 for nondeductible basis, Roth conversions and some Roth distributions.
- Rollovers, QCDs, early withdrawals, inherited IRAs and missed RMDs change the forms you need.
Where to Report an IRA Distribution on Form 1040
For tax year 2025, line 4a is "IRA distributions" and line 4b is "Taxable amount." Your IRA custodian sends Form 1099-R, and you use it to fill in both lines.
The basic reporting path
The 2025 Form 1040 instructions set out how each situation looks on the form:
| Situation | Line 4a | Line 4b | Line 4c |
|---|---|---|---|
| Fully taxable distribution | Blank | Total distribution | None |
| Partly taxable | Total distribution | Taxable portion | Special box, if any |
| Entire amount rolled over | Total distribution | -0- | Box 1, Rollover |
| Entire amount is a QCD | Total distribution | -0- | Box 2, QCD |
| Roth distribution, code Q | Total distribution | -0- | None |
A blank line 4b is not the right entry when nothing is taxable. Enter -0-. With several distributions, work out each taxable amount separately, total them on 4b, and put the combined gross amount on 4a.
Reading Form 1099-R before you file
Three boxes matter most:
- Box 1: the gross distribution, before withholding.
- Box 2a: the taxable amount the payer reports. For traditional IRAs it often just repeats Box 1.
- Box 7: the distribution code, such as 1 (early, no known exception), 7 (normal) or Q (qualified Roth).
Do not copy Box 2a blindly. Custodians rarely know your basis, and they generally do not compute the taxable amount of a Roth distribution at all.
Here is an example. You withdraw $10,000 from a traditional IRA with $2,000 of after-tax basis, and Form 8606 shows $1,500 of that is nontaxable. Line 4a shows $10,000. Line 4b shows $8,500.
How to Determine the Taxable Amount of an IRA Distribution
Taxability depends on the IRA type, your basis, the kind of transaction, your age and any exception that applies. The custodian's figure is a starting point, not the final answer.
Traditional IRA distributions and after-tax basis
Deductible contributions and earnings are generally taxable when withdrawn. Previously taxed nondeductible contributions are not.
Form 8606 tracks that basis. It aggregates all your traditional, SEP and SIMPLE IRAs, uses December 31 values, and allocates the nontaxable share pro rata. Spouses each file their own Form 8606.
Skipping it has a cost. Failing to file a required Form 8606 for a nondeductible contribution carries a $50 penalty, and overstating nondeductible contributions carries a $100 penalty, unless you show reasonable cause. More importantly, you risk paying tax twice on the same money.
Roth IRA distributions
A qualified Roth distribution is tax-free. It requires a five-tax-year period from your first Roth contribution, plus age 59½, disability, death, or a first-home purchase (up to a $10,000 lifetime limit).
For nonqualified distributions, Publication 590-B sets the order:
- Regular contributions
- Conversions and rollovers, oldest first
- Earnings
Each conversion has its own separate five-year clock for the 10% additional tax on early withdrawal of the converted amount.
Early distributions, RMDs, and additional tax
Income tax and the 10% additional tax are separate questions. Taxable distributions before 59½ generally attract the 10% tax unless an exception applies:
- Disability
- Unreimbursed medical costs above 7.5% of AGI
- First-home purchase
- Qualified education
SIMPLE IRA withdrawals within two years of joining jump to 25%.
If code 1 is correct on every Form 1099-R and the 10% applies to the full amount, you can skip Form 5329 and report the tax on Schedule 2, line 8. Claiming an exception requires Form 5329.
Other points to watch:
- Owner RMDs start at 73 for traditional, SEP and SIMPLE IRAs. Roth owners have no lifetime RMDs.
- Missed RMDs carry a 25% tax on the shortfall, reducible to 10% with timely correction.
- Inherited IRAs under the 10-year rule generally must be emptied by December 31 of the tenth year after death; eligible designated beneficiaries (such as a surviving spouse) follow different rules.
Other IRA Transactions and Forms You May Need
Rollovers and conversions
A rollover and a Roth conversion are different things. Both generate Form 1099-R.
- Direct trustee-to-trustee transfer: not subject to the one-rollover limit.
- Indirect rollover: redeposit within 60 days. You get one per 12-month period across all your IRAs.
- Roth conversion: exempt from that limit. The taxable amount is figured on Form 8606 Part II and carried to line 4b.
- RMDs: cannot be rolled over.
Qualified charitable distributions
A QCD is reported as an IRA distribution but can be excluded from income. The money must go directly from the IRA trustee to an eligible charity, and you must be at least 70½ on the distribution date.
The limit is $108,000 for 2025 and $111,000 for 2026, per IRS Notice 2025-67. Donor-advised funds and ongoing SEP or SIMPLE IRAs are excluded. You also need the same written acknowledgment required for a deductible gift.
The IRS's own example: Amy, 75, has a $30,000 IRA with $10,000 basis. Her trustee pays $25,000 to charity. The $20,000 otherwise taxable portion is the QCD, she files Form 8606, and $5,000 of basis remains.
Which form for which situation
- Form 8606: basis and certain Roth transactions.
- Form 5329: additional taxes, exceptions and missed RMD relief.
- Form 5498: the custodian's record of contributions, rollovers and year-end value. It is not your distribution report.
- Form 1040 instructions: the final word on entries.
Practical Form 1040 Filing Checklist
Gather these documents first:
- Every Form 1099-R
- Last year's Form 8606
- Form 5498
- Rollover confirmations
- QCD receipts
- Inherited IRA statements
- RMD records
Then work through these steps:
- Identify the IRA and the type of transaction.
- Reconcile each Form 1099-R against your records.
- Calculate the taxable portion.
- Complete Form 8606 or Form 5329 if required.
- Enter the gross amount on line 4a and the taxable amount on line 4b.
- Retain supporting records for every IRA distribution you report.
Common mistakes:
- Reporting only the taxable amount on 4a and 4b when both are needed.
- Treating a rollover as ordinary income.
- Overlooking prior nondeductible basis.
- Missing a valid early-distribution exception.
- Confusing U.S. reporting with Australian reporting.
The Australian side
Most foreign pensions are taxable in Australia, even if U.S. tax was withheld. A foreign income tax offset may be available.
One ATO private ruling treated a specific IRA's earnings as assessable on withdrawal, but it does not bind other taxpayers. U.S. citizens in Australia can be taxed by both countries under the treaty.
VJM Global's U.S.-compliant CPAs and Chartered Accountants prepare Form 1040 returns and handle cross-border cases like these. The firm has served 250+ Australian businesses.
Frequently Asked Questions
Where does IRA distribution go on 1040?
Gross distributions go on line 4a and the taxable amount on line 4b. A fully taxable distribution can go on 4b alone. Confirm the line numbers against the form for your tax year.
What IRS form is used to report IRA distributions?
Form 1040 reports the income, and Form 1099-R is the custodian's statement. Form 8606 or Form 5329 may be needed for basis calculations or exceptions.
What happens if you don't fill out Form 8606?
You may pay tax twice on nondeductible basis. A $50 penalty applies to a missing required form, unless you show reasonable cause. You can correct earlier years with Form 1040-X.
What are the ordering rules for distributing Roth IRA assets?
Regular contributions come out first, then conversions and rollovers (oldest first), then earnings. Whether earnings are taxable depends on the qualified-distribution and five-year rules.
What is a qualified charitable distribution (QCD) from an IRA?
A QCD is a direct payment from your IRA trustee to an eligible charity. It can be excluded from taxable income when all requirements are met, but it must still appear on your return, with line 4c box 2 checked.
