The Roth conversion deadline is December 31 of the tax year, so a conversion for 2026 must settle in a Roth account on or before December 31, 2026. A conversion is not a contribution: it gets no April filing-season grace period.
The Roth conversion deadline for the 2026 tax year is December 31, 2026. To count for 2026, the converted amount must settle in the Roth account by that date. There is no April 15 extension, because the IRS includes a conversion in income in the year it occurs, unlike an IRA contribution (Source: IRS Instructions for Form 8606).
What is the Roth conversion deadline for 2026?
The Roth conversion deadline for 2026 is December 31, 2026. A conversion is a distribution the IRS assigns to income in the calendar year it happens, so the transfer has to complete inside the tax year to count (Source: IRS Instructions for Form 8606). The taxable amount lands on that year’s Form 1040, which makes the year-end date the effective deadline.
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The date comes from how the conversion is taxed: Form 8606 reports it on that same year’s return, so the income attaches to the year of the transfer. A Roth conversion therefore differs from an IRA contribution; waiting until late December is fine if it settles in time.
Roth conversion deadline vs. the IRA contribution deadline
The Roth conversion deadline is December 31 of the tax year; the IRA contribution deadline is the following April. A 2026 IRA contribution can be made up to the return due date, generally April 15, 2027, not including extensions (Source: IRS Publication 590-A). A conversion gets no such grace period, the most-repeated clarification on this topic.
| Feature | Roth conversion | IRA contribution |
|---|---|---|
| 2026 deadline | December 31, 2026 | Approx. April 15, 2027 (no extension) |
| Dollar cap | No limit on amount converted | $7,500 for 2026, plus $1,100 catch-up at age 50+ ($8,600 total) (Source: IRS Notice 2025-67) |
| Income limit | None | Roth contribution phase-out: MAGI $153,000 to $168,000 single, $242,000 to $252,000 MFJ (Source: IRS Notice 2025-67) |
| When it counts for the year | When the conversion settles | When the contribution is made or postmarked by the deadline |
Mixing these two deadlines is the classic error. A contribution earmarked “for 2026” can be made in early 2027; a conversion cannot, because once January 1 arrives it belongs to the new tax year. Investors often size a conversion first with the Q3 Advisors guide to how much to convert to a Roth.
“Requested” vs. “settled”: the year-end custodian trap
A Roth conversion counts for the year it settles, not the year you request it. If you submit the order on December 30, 2026, but the cash posts on January 2, 2027, the IRS treats it as a 2027 conversion. Custodians also set processing cutoffs in mid-to-late December, so a last-day order can slip into the next tax year.
| What happens | Settlement date | Taxed in |
|---|---|---|
| Conversion posts to the Roth account by year-end | On or before Dec 31, 2026 | 2026 tax year |
| Order placed late December, settles after New Year | Jan 2, 2027 | 2027 tax year |
Some brokerages publish a same-day cutoff on December 31, after which a request rolls to the next year. Because cutoffs differ by firm, three steps keep a conversion inside the intended year:
- Ask the custodian for its year-end cutoff date and time in writing.
- Initiate the conversion several business days before that cutoff, not on December 31.
- Verify the funds posted to the Roth and that a Form 1099-R is expected for the right year.
Estimated taxes: the conversion deadline most people miss
A Roth conversion adds ordinary income in the year it happens, and that tax can be due before you file. Because the system is pay-as-you-go, a large fourth-quarter conversion can trigger an underpayment penalty even if you pay in full by April. The related deadline is the Q4 estimated payment, generally due January 15, 2027 (Source: IRS Form 1040-ES).
Underpayment penalties are usually avoided by meeting a safe harbor, paying at least one of the following (Source: IRS Form 1040-ES; IRS Tax Topic 306):
| Safe-harbor test | Pay at least | Applies to |
|---|---|---|
| Current-year test | 90% of the total 2026 tax | All filers |
| Prior-year test (2025 AGI of $150,000 or less) | 100% of the 2025 tax | Most filers |
| Prior-year test (2025 AGI above $150,000) | 110% of the 2025 tax | Higher earners |
The quarter in which you convert sets when the tax is generally due:
| Conversion date in 2026 | Estimated-tax quarter | Payment generally due |
|---|---|---|
| Jan 1 to Mar 31 | Q1 | April 15, 2026 |
| Apr 1 to May 31 | Q2 | June 15, 2026 |
| Jun 1 to Aug 31 | Q3 | September 15, 2026 |
| Sep 1 to Dec 31 | Q4 | January 15, 2027 |
Withholding is a common fix: money withheld from a paycheck or an RMD is treated as paid evenly across the year (Source: IRS Form 1040-ES).
Do my RMDs have to come out before I convert?
Yes. If you are RMD age, the required minimum distribution for the year must be satisfied before you convert. An RMD cannot be converted, so the required amount has to leave the traditional IRA first, and both the RMD and the conversion must complete by December 31, 2026. This RMD-first sequencing is easy to miss.
The required beginning age is 73 for most current retirees, moving to 75 for people born in 1960 or later (Source: IRS Publication 590-B). A December conversion at RMD age runs a compressed calendar: take the RMD, let it settle, then convert, all before custodian cutoffs. See the Q3 Advisors overview of required minimum distributions for 2026. Because a Roth IRA has no lifetime RMDs for the original owner, some investors convert to reduce future required distributions.
Is there an income limit, and can I undo a conversion?
There is no income limit on a Roth conversion, and the conversion cannot be undone. Anyone with a traditional IRA or eligible plan balance can convert, regardless of income. Conversions made in 2018 or later cannot be recharacterized, a change enacted by the Tax Cuts and Jobs Act, so the transaction is permanent (Source: IRS Publication 590-A).
The income phase-outs some articles cite ($153,000 to $168,000 single, $242,000 to $252,000 married filing jointly for 2026) apply to direct Roth IRA contributions, not conversions (Source: IRS Notice 2025-67).
Because a conversion is permanent, the sizing decision is often made once, near year-end, when income is known. The tax is due at ordinary income rates for the conversion year, and paying it from outside taxable funds leaves the full balance in the Roth (Source: IRS Publication 590-A). Whether the timing pays off over a full retirement is what a Roth conversion break-even analysis tests.
How the 5-year rules and the pro-rata rule interact with year-end
Each Roth conversion starts its own five-year clock for penalty-free access to the converted principal, beginning January 1 of the conversion year (Source: IRS Publication 590-B). So a conversion completed December 31, 2026, is treated as starting January 1, 2026. The pro-rata rule then uses your combined IRA balance on December 31 to set the taxable share.
If you hold both pre-tax and after-tax money across traditional, SEP, and SIMPLE IRAs, the taxable portion of any conversion uses their total value on December 31, reported on Form 8606 (Source: IRS Instructions for Form 8606). This is the backbone of the backdoor Roth: existing pre-tax IRA money can make part of an otherwise tax-free conversion taxable.
Will a conversion raise my Medicare premiums or NIIT later?
A Roth conversion can raise two costs that arrive later. Medicare’s income-related monthly adjustment amount (IRMAA) uses MAGI from the return filed two years earlier, so a 2026 conversion can raise 2028 Part B and Part D premiums (Source: SSA POMS HI 01101.020). Pushing 2026 MAGI one dollar over a tier boundary raises the full annual surcharge for that later year.
| 2026 MAGI, single filer | 2026 MAGI, married filing jointly | Total monthly Part B premium |
|---|---|---|
| $109,000 or less | $218,000 or less | $202.90 (no surcharge) |
| Over $109,000 to $137,000 | Over $218,000 to $274,000 | $284.10 |
| Over $137,000 to $171,000 | Over $274,000 to $342,000 | $405.80 |
| Over $171,000 to $205,000 | Over $342,000 to $410,000 | $527.50 |
| Over $205,000 to under $500,000 | Over $410,000 to under $750,000 | $649.20 |
| $500,000 or more | $750,000 or more | $689.90 |
The Net Investment Income Tax is the second echo. The conversion itself is not net investment income, because IRA distributions are excluded, but the interaction is indirect: a conversion raises MAGI, and the 3.8% tax applies over $200,000 single or $250,000 married filing jointly, thresholds not indexed for inflation (Source: 26 U.S.C. 1411). A larger conversion can expose other interest, dividends, or capital gains to the tax, detailed in the Q3 Advisors explainer on the Net Investment Income Tax for 2026.
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Frequently asked questions
When is the deadline for a Roth conversion?
The Roth conversion deadline is December 31 of the tax year, so December 31, 2026, for 2026. The amount must settle in the Roth account by that date. Unlike an IRA contribution, there is no filing-season extension, because the IRS assigns a conversion to the year it occurs (Source: IRS Instructions for Form 8606).
Can I do a Roth conversion for 2025 in 2026?
No. A conversion completed in 2026 is a 2026 conversion, not a 2025 one, because it counts for the year it settles. The December 31 deadline cannot be reached back into a prior year the way an IRA contribution can. To be taxed in 2025, the transfer had to settle by December 31, 2025 (Source: IRS Instructions for Form 8606).
What is the deadline for Roth IRA conversions?
The deadline for Roth IRA conversions is December 31 of the year you want the income taxed, so December 31, 2026, for 2026. The custodian must complete the transfer into the Roth by that date, because the IRS includes the converted amount in that year’s Form 1040 (Source: IRS Instructions for Form 8606).
Is there an April 15 deadline for Roth conversions?
No. The April 15 deadline applies to IRA contributions, not conversions. A 2026 IRA contribution can be made up to about April 15, 2027, but a conversion has no such extension and must settle by December 31, 2026 (Source: IRS Publication 590-A). Mixing the two deadlines is the most common mistake on this topic.
Can you reverse a Roth conversion?
No. Conversions made in 2018 or later cannot be recharacterized or undone, a change enacted by the Tax Cuts and Jobs Act (Source: IRS Publication 590-A). Before 2018, an investor could reverse a conversion. Today it is permanent, which is why many people wait until income is known before converting.
Do Roth conversions have income limits?
No. A Roth conversion has no income limit; anyone with a traditional IRA or eligible plan balance can convert, regardless of income, and the dollar amount is uncapped. The MAGI phase-outs of $153,000 to $168,000 single and $242,000 to $252,000 married filing jointly for 2026 apply only to direct Roth IRA contributions, not conversions (Source: IRS Notice 2025-67).
What happens if I miss the Roth conversion deadline?
If a conversion does not settle by December 31, it counts for the next tax year, so the income and its tax shift into that year. Nothing is lost, but the timing changes, which can affect your bracket, IRMAA two years out, and estimated taxes. The usual cause is a late-December order that settles in January (Source: IRS Instructions for Form 8606).
Does a Roth conversion count as income for the year?
Yes. The taxable portion of a Roth conversion is ordinary income in the year it settles, reported on Form 8606 and included on that year’s Form 1040 (Source: IRS Instructions for Form 8606). It stacks on top of wages, pensions, and Social Security, and can push part of your income into a higher bracket.
