Retirement & Tax Planning Answers
How to Report Your RMD on Your Tax Return
Quick answer
A required minimum distribution from a traditional IRA is reported on Form 1040 lines 4a (total IRA distributions) and 4b (the taxable amount, usually identical to 4a since most RMDs are fully taxable). An RMD from a 401(k), 403(b), or other employer plan goes on lines 5a and 5b instead, the pensions and annuities lines. There's no separate form or line just because a distribution happens to be your RMD, it's reported the same way as any other distribution from that account type. Your custodian sends you, and separately files with the IRS, Form 1099-R reporting the distribution, and that 1099-R is the actual source document used to fill in those lines. The IRS also gets an independent check on whether you took your RMD at all: your custodian files Form 5498 by the end of May reporting your account's prior-year-end value and checking a box confirming an RMD was due for the year, which the IRS can cross-reference against whether a matching 1099-R shows up.
On Form 1040, IRA distributions, including RMDs from traditional IRAs, SEP IRAs, and SIMPLE IRAs, are reported on lines 4a and 4b. Distributions from 401(k)s, 403(b)s, and most other employer-sponsored plans go on lines 5a and 5b, the return's pension and annuity lines, not the IRA lines. Line 4a/5a shows the gross distribution; line 4b/5b shows the taxable amount, which is usually the same number unless you have after-tax basis in the account (tracked on Form 8606 for IRAs) or made a Qualified Charitable Distribution.
Form 1099-R is what makes those numbers possible to fill in accurately. Your IRA custodian or plan administrator issues it by January 31 for the prior year, showing the gross distribution, any tax withheld, and a distribution code (a normal RMD after age 59½ is typically code 7) that tells the IRS what kind of distribution occurred. Whoever prepares your return, including tax software, is transcribing the 1099-R onto the 1040, not independently calculating what you owe on the distribution.
Form 5498 is the piece most people never see, because the custodian files it directly with the IRS and only sends you an informational copy, typically in May. It reports your account's fair market value as of December 31 of the prior year and includes a box confirming whether an RMD is required for the current year, sometimes along with the calculated RMD amount and a deadline. That gives the IRS a second data point independent of your 1099-R: if Form 5498 shows an RMD was required and no matching distribution shows up, that's a mismatch the IRS's automated matching programs are built to catch.
If a Qualified Charitable Distribution satisfied all or part of your RMD, the 1099-R still shows the full gross distribution in box 4a/5a, because the custodian doesn't know at the time of the distribution that it was directed to a charity. The taxable amount on line 4b/5b needs to be reduced by the QCD amount, and the return should note "QCD" next to that line. If your preparer or software isn't told about the QCD separately, the full amount gets taxed as if no QCD occurred.
If you missed an RMD entirely or took less than required, that gets reported on Form 5329, which calculates the excise tax, reduced under SECURE 2.0 to 25% of the shortfall, or 10% if corrected within two years, and is also where you can attach a statement requesting a penalty waiver for reasonable cause. Form 5329 is a separate filing from the 1040 income lines; the corrected distribution itself, once taken, is reported normally on 4a/4b or 5a/5b for the year you actually took it.
The 20% mandatory withholding rule that catches people off guard doesn't apply to IRA distributions or to RMDs specifically, even from a 401(k). That 20% mandatory federal withholding rule applies only to eligible rollover distributions from an employer plan, a lump sum or partial distribution that could have been rolled over but wasn't. An RMD is never eligible for rollover in the first place, so it's excluded from that mandatory 20% rule regardless of which account it comes from. IRA distributions, including IRA RMDs, are subject to elective withholding that defaults to 10% unless you request a different percentage, a flat dollar amount, or no withholding at all.
When your 1099-R arrives, check the gross distribution and withholding against what you actually received before assuming your tax software populated 4a/4b or 5a/5b correctly, especially in a year with a QCD or a missed-then-corrected RMD.
If part of your RMD went to charity as a QCD, flag it explicitly to whoever prepares your return. The 1099-R alone won't show that distinction, and missing it means paying tax on money that should have been excluded.
- Assuming an RMD gets its own line or special treatment on Form 1040. It's reported as a regular IRA or pension distribution, on 4a/4b or 5a/5b depending on account type.
- Confusing the mandatory 20% withholding on employer-plan rollover-eligible distributions with the withholding on an RMD, which is never subject to that 20% rule and defaults to 10% unless you elect otherwise.
- Not telling your preparer about a QCD, resulting in the full RMD being taxed instead of the QCD portion being excluded.
- Assuming the IRS only has your 1099-R as a record. Form 5498's RMD-required indicator gives the IRS a second, independent way to notice a missed distribution.