Reporting an RMD on your tax return takes one Form 1099-R and two lines of Form 1040, but one checkbox decides which lines you use and a QCD or after-tax basis decides which numbers go on them.
You report a required minimum distribution from the Form 1099-R your custodian sends by January 31. If box 7b (IRA/SEP/SIMPLE) is checked, the taxable amount goes on Form 1040 line 4b; otherwise a 401(k), 403(b) or pension RMD goes on line 5b. Tax withheld in box 4 goes on line 25b. Only a missed RMD needs Form 5329.
By Craig Wear, CFP® | Last reviewed: October 9, 2026
Key Takeaways
- IRA RMDs are reported on Form 1040 lines 4a and 4b; RMDs from 401(k), 403(b) and governmental 457(b) plans go on lines 5a and 5b. When the whole distribution is taxable, line 4a or 5a stays blank (IRS Form 1040 instructions).
- Nothing on Form 1099-R labels a payment as an RMD: a retiree’s RMD carries the same code 7 (“normal distribution”) as any other withdrawal after age 59½ (IRS Instructions for Forms 1099-R and 5498).
- Federal tax withheld (Form 1099-R box 4) goes on Form 1040 line 25b, and the default withholding rate on a nonperiodic IRA payment is 10% unless the retiree picks a rate from 0% to 100% on the 2026 Form W-4R (IRS Form W-4R).
- Since the 2025 Form 1040, a qualified charitable distribution is flagged by checking box 2 (“QCD”) on line 4c instead of writing “QCD” beside line 4b, and the 2026 draft Form 1040 keeps that checkbox; the 2026 QCD limit is $111,000 per IRA owner.
- A missed or short RMD is reported on Form 5329, Part IX (lines 52 to 55): the excise tax is 25% of the shortfall, or 10% if it is corrected within the correction window (IRS Form 5329 instructions).
- An RMD is taxed in the year it is received, so delaying the first RMD to April 1 puts two RMDs on one return (IRS RMD FAQs).
RMD reporting by the numbers (2026)
The 1099-R deadline is January 31 for the payer to send the recipient copy; RMD figures use the December 31 prior-year balance. Sources: IRS Forms 1040, 1099-R, 5329, W-4R instructions and Publication 590-B.
How do you report an RMD on your tax return?
You report an RMD exactly like any other retirement withdrawal: copy the gross and taxable amounts from Form 1099-R onto Form 1040 lines 4a and 4b (IRAs) or 5a and 5b (employer plans). There is no separate “RMD line” and no separate RMD form for a year in which the full RMD was taken.
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The Form 1040 instructions add one rule that trips up many filers: if the IRA distribution is fully taxable, enter it on line 4b and make no entry on line 4a. The same rule applies to a fully taxable pension or 401(k) payment on lines 5a and 5b.
Line 4a (or 5a) is used only when part of the distribution is not taxable, such as a QCD, after-tax basis, a rollover or a Roth conversion in the same year. In that case the gross amount goes on line 4a and the taxable part goes on line 4b.
What on Form 1099-R shows that a distribution was an RMD?
Nothing on Form 1099-R identifies a payment as an RMD. A custodian reports an RMD to an owner age 59½ or older with code 7 in box 7a, the same “normal distribution” code used for any other withdrawal or for a Roth conversion at that age, according to the IRS instructions for Forms 1099-R and 5498.
The RMD itself is flagged on a different form. Form 5498 has box 11 (“Check if RMD for” the following year) and boxes 12a and 12b for the RMD date and amount, which a custodian may use instead of a separate RMD statement due by January 31. That makes Form 5498 and the custodian’s RMD notice the records to keep if a shortfall is ever questioned.
For a full box-by-box tour of the form, including the 2026 renumbering of box 7 into boxes 7a through 7d, see the Form 1099-R guide. The fields that matter for an RMD are boxes 1, 2a, 2b, 4, 7a and 7b.
Does an RMD go on line 4 or line 5 of Form 1040?
The IRA/SEP/SIMPLE checkbox on Form 1099-R answers this: checked means lines 4a and 4b, unchecked means lines 5a and 5b. On 2026 forms that checkbox is box 7b; on earlier forms it sits beside box 7.
| Account the RMD came from | IRA/SEP/SIMPLE box | Form 1040 lines | Typical box 7a code |
|---|---|---|---|
| Traditional, SEP or SIMPLE IRA | Checked | 4a and 4b | 7 |
| 401(k), 403(b), governmental 457(b) | Not checked | 5a and 5b | 7 |
| Pension or annuity from a plan | Not checked | 5a and 5b | 7 |
| Inherited IRA (beneficiary RMD) | Checked | 4a and 4b | 4 (death) |
| Inherited 401(k) or 403(b) | Not checked | 5a and 5b | 4 (death) |
The 1040 instructions state that pension and annuity payments “include distributions from 401(k), 403(b), and governmental 457(b) plans,” which is why a 401(k) RMD never goes on the IRA line. Beneficiaries follow the same placement; the inherited IRA RMD calculation guide covers how much they must take.
How do you report a 2026 RMD, step by step?
A 2026 RMD is reported on the 2026 return filed in 2027, in six steps that run from confirming the required amount to checking for a shortfall.
- Confirm the required amount. Divide each account’s December 31, 2025 balance by the divisor from the Uniform Lifetime Table (24.6 for an owner who turns 75 in 2026), or use the amount on the custodian’s RMD notice.
- Collect every Form 1099-R. Payers must send recipient copies by January 31, 2027; one form usually covers all 2026 payments from one account.
- Sort by the IRA/SEP/SIMPLE box. Checked forms go to lines 4a and 4b; unchecked forms go to lines 5a and 5b.
- Figure the taxable amount. Fully taxable payments go only on line 4b or 5b; QCDs, after-tax basis and same-year conversions require the gross on line 4a and a smaller line 4b.
- Carry withholding to line 25b. Add box 4 from every Form 1099-R and attach the forms to a paper return if any tax was withheld.
- Check for a shortfall. If total distributions were less than the required amount, complete Form 5329, Part IX before filing.
Worked example (hypothetical, 2026 figures). Margaret is single and turns 75 in 2026. Her traditional IRA held $600,000 on December 31, 2025, so her IRA RMD is $600,000 / 24.6 = about $24,390. Her old employer’s 401(k) held $200,000, so its separate RMD is $200,000 / 24.6 = about $8,130.
She has the IRA custodian send $8,000 directly to a charity as a QCD and pays the remaining $16,390 to herself with the 10% default withholding ($1,639). The 401(k) pays her $8,130 with $813 withheld. Her two forms flow to Form 1040 like this:
| Form 1099-R field | IRA form | 401(k) form | Where it goes on Form 1040 |
|---|---|---|---|
| Box 1, gross distribution | $24,390 | $8,130 | IRA: line 4a $24,390. 401(k): line 5a left blank (fully taxable) |
| Box 2a, taxable amount | $24,390, with box 2b “taxable amount not determined” checked | $8,130 | Line 4b $16,390 (after the $8,000 QCD). Line 5b $8,130 |
| Box 4, federal tax withheld | $1,639 | $813 | Line 25b $2,452 |
| Box 7a, code | 7 (code Y for the QCD is optional in 2026) | 7 | No entry; the code drives software logic |
| IRA/SEP/SIMPLE box | Checked | Not checked | Decides line 4 versus line 5 |
| Line 4c | Not on Form 1099-R | Check box 2 (QCD) | |
Margaret’s taxable retirement income is $24,520 ($16,390 plus $8,130), not the $32,520 shown in box 1 of her two forms. She could not satisfy the 401(k) RMD from the IRA or vice versa, because RMD aggregation rules keep IRAs and 401(k) plans in separate buckets.
What changes on line 4b when part of the RMD is a QCD or after-tax money?
Line 4b drops below the gross amount whenever part of the RMD is not taxable, and each reason has its own marker. The custodian usually cannot know these facts, which is why box 2a often shows the full amount with box 2b checked.
| Situation | Line 4a | Line 4b | Extra step |
|---|---|---|---|
| Fully taxable IRA RMD | Blank | Full amount | None |
| Part of the RMD paid as a QCD | Gross distribution | Non-QCD part | Check line 4c box 2 |
| Traditional IRA holds nondeductible contributions (basis) | Gross distribution | Taxable part from Form 8606, line 15c | File Form 8606, Part I |
| RMD plus a Roth conversion in the same year | Gross distribution | Taxable part via Form 8606 | Form 8606, Part II for the conversion |
QCDs. The IRS instructions say to enter the total distribution on line 4a, enter only the part that is not a QCD on line 4b, and check box 2 on line 4c. The 2026 draft Form 1040 keeps the same “Rollover / QCD / other” checkboxes on line 4c (IRS 2026 draft Form 1040). The records to keep are covered in what documentation a QCD requires.
After-tax basis. When any traditional IRA holds nondeductible contributions, a share of every distribution is tax free under the pro-rata rule. Form 8606 uses the year-end value of all traditional IRAs to split the RMD, and a QCD is excluded from line 7 of that form. The Form 8606 guide walks through those lines.
No rollover. Publication 590-B states that amounts that must be distributed during a year “aren’t eligible for rollover treatment,” so the rollover exception on line 4c cannot be used to make an RMD tax free.
Which year’s return gets the RMD if the first one is delayed to April 1?
The RMD goes on the return for the year the money is actually received, not the year it was “for.” The IRS RMD FAQs allow the first RMD to wait until April 1 of the following year, but the second RMD is still due by December 31 of that same year.
A retiree born in 1953 turns 73 in 2026. If the 2026 RMD is taken in March 2027, both the 2026 RMD and the 2027 RMD land on the 2027 Form 1040, and the 1099-R for 2027 will show both in box 1. Taking the first RMD in 2026 spreads the income over two returns instead.
That timing choice also shapes conversion room in the first RMD year, which is covered in Roth conversions in your first RMD year.
Where does tax withheld from an RMD go?
Federal income tax withheld from an RMD, shown in Form 1099-R box 4, goes on Form 1040 line 25b. The 1040 instructions also say to attach Form 1099-R to the front of a paper return when tax was withheld.
RMDs are excluded from “eligible rollover distributions,” so the mandatory 20% withholding that applies to many 401(k) cash-outs does not apply. Nonperiodic payments instead default to 10% under Form W-4R, and the recipient can elect any rate from 0% to 100%.
Choosing between withholding and quarterly estimated payments, and how much to withhold, is covered in how to pay taxes on an RMD. For reporting purposes, only the box 4 amounts matter.
What if the RMD was missed or too small?
A shortfall is reported on Form 5329, Part IX, filed with the return for the year the RMD was required. Line 52 shows the required amount, line 53 the amount actually distributed, line 54 the excise tax and line 55 the total.
The Form 5329 instructions set the tax at 25% of the shortfall, reduced to 10% when the missed amount is distributed and a return reflecting the tax is filed within the correction window. A reasonable-cause waiver is requested by writing “RC” and the amount on the dotted line beside line 54 and attaching an explanation.
On the 2025 return, the line 55 total flows to Schedule 2, line 8. The 2026 drafts renumber Schedule 2, so the final 2026 form is the one to check. Rates, deadlines and waiver letters are covered in detail in the RMD penalty guide. For how Schedule 2 and the other attachments feed the return, see IRS tax schedules explained.
How does RMD reporting interact with a Roth conversion in the same year?
A same-year Roth conversion usually shares the RMD’s Form 1099-R, so Form 8606 does the work of separating the two. The IRS instructions tell custodians to report a conversion with code 7 for owners 59½ or older and to use one Form 1099-R for all distributions from one account with the same code, so box 1 may blend the RMD and the conversion.
The RMD itself cannot be converted, because Publication 590-B says RMDs “aren’t eligible for rollover treatment,” so retirees generally take the year’s RMD before converting. The conversion amount then goes on Form 8606, Part II, and the total still lands on line 4a with the taxable portion on line 4b.
Retirees who expect RMDs to push them into higher brackets later often consider converting in the years before RMDs begin, when there is no RMD to report alongside the conversion. A financial professional can model whether that fits a specific situation; the mechanics of reporting the conversion itself are in how to report a Roth conversion on taxes.
Frequently asked questions
Is an RMD reported differently from a regular IRA withdrawal?
No. An RMD is reported on Form 1040 exactly like any other distribution: lines 4a and 4b for IRAs, lines 5a and 5b for employer plans. Form 1099-R uses the same code 7 for both, and there is no separate RMD line.
Why is line 4a blank when I report my RMD?
The Form 1040 instructions say to enter a fully taxable IRA distribution only on line 4b and make no entry on line 4a. Line 4a is used only when part of the distribution is not taxable, such as a QCD, after-tax basis or a rollover.
How do I report a QCD that satisfied part of my RMD?
Enter the total distribution on line 4a, the part that was not a QCD on line 4b, and check box 2 (QCD) on line 4c. This checkbox replaced the older practice of writing “QCD” next to line 4b starting with the 2025 Form 1040.
Do I need to attach Form 1099-R to my tax return?
Only if federal income tax was withheld. The Form 1040 instructions say to attach Form 1099-R to the front of the return when box 4 shows withholding.
I have several IRAs. Do I report each 1099-R on a separate line?
No. Add the gross amounts from all IRA Forms 1099-R and enter the total on line 4a when it is needed, and enter the combined taxable amount on line 4b. Employer plan forms are totaled the same way on lines 5a and 5b.
I took more than my RMD. Do I report the extra?
Yes. Every dollar distributed is reported and taxed in the year received, and an excess over the RMD cannot be credited toward a later year’s RMD, according to IRS Publication 590-B.
Do I report RMDs from a Roth IRA or Roth 401(k)?
Owners do not have lifetime RMDs from a Roth IRA, and designated Roth accounts in 401(k) and 403(b) plans have no lifetime RMDs either. Beneficiaries who inherit Roth accounts do have RMDs, reported on line 4a or 5a with the taxable amount, often zero, on line 4b or 5b.
Do I need Form 5329 if I took my full RMD on time?
No. Form 5329, Part IX is needed only when distributions were less than the required amount, or when requesting a waiver of the excise tax on a shortfall.
Methodology: Line numbers and reporting rules come from the IRS Instructions for Form 1040 (2025), the 2026 draft Form 1040 and Schedule 2, the IRS Instructions for Forms 1099-R and 5498 (2026), the Instructions for Form 5329 (2025) and the 2026 draft Form 5329, the Instructions for Form 8606 (2025), Publication 590-B (2025), the 2026 Form W-4R and the IRS RMD FAQs, all read on IRS.gov in October 2026. The worked example is hypothetical and uses the Publication 590-B Uniform Lifetime Table divisor. Draft forms can change before release, so final 2026 line numbers should be confirmed. Because this is a tax topic, software help threads and anonymous forum answers were excluded as sources.
This article is for educational purposes only and is not individualized investment, tax, or legal advice. Consult a qualified professional about your specific situation.
