The Roth conversion deadline for the 2026 tax year is December 31, 2026, the last day a conversion can post and still be taxed as 2026 income. This is the single point most people get wrong: a conversion is not a contribution, and it does not get the April filing-season grace period.
To count for the 2026 tax year, a Roth conversion must move money out of a traditional IRA or workplace plan and settle in a Roth account on or before December 31, 2026. Unlike an IRA contribution, there is no April 15 extension for conversions, because the IRS includes a conversion in income in the calendar year it occurs (Source: IRS Instructions for Form 8606, 2025).
What is the Roth conversion deadline for 2026?
The Roth conversion deadline for 2026 is December 31, 2026. A conversion is a distribution that the IRS includes in your income in the calendar year it happens, so the transfer has to be completed inside the tax year to count toward that year (Source: IRS Instructions for Form 8606, 2025). There is no filing-extension window the way contributions have.
Talk With Craig Wear's Team
Craig has helped IRA millionaires save over $1 million each in unnecessary taxes. Find out if a Roth conversion strategy fits your retirement, with no sales pressure and no product pitch.
The IRS does not print a single sentence that reads “Roth conversions are due December 31.” The date comes from how the conversion is taxed. The 2025 Instructions for Form 8606 direct filers to “complete Part II if you converted part or all of your traditional IRAs to a Roth IRA” during that year, and the converted amount lands on that year’s Form 1040 (Source: IRS Instructions for Form 8606, 2025). Because the income is assigned to the year of the transfer, the year-end date is the effective deadline.
This is where a Roth conversion differs from an IRA contribution. Waiting until the last week of December is common, since many savers want their full-year income picture before deciding how much to convert. The rules allow that, as long as the transaction actually settles in time.
Roth conversion deadline vs. the IRA contribution deadline
The conversion deadline is December 31 of the tax year; the IRA contribution deadline is the following April. For 2026, a traditional or Roth IRA contribution can be made up to the April 2027 return due date, generally April 15, and not including extensions (Source: IRS Publication 590-A, 2025). A conversion gets no such grace period, which is 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+ (Source: IRS Notice 2025-67) |
| Income limit | None | Roth contribution phase-outs apply by income: $153,000 to $168,000 single, $242,000 to $252,000 MFJ for 2026 (Source: IRS Notice 2025-67) |
| Counts for the year when | The conversion settles | 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. Once January 1 arrives, any conversion you initiate belongs to the new tax year.
“Requested” vs. “settled”: the year-end trap
A conversion counts for the year it settles, not the year you request it. If you submit the paperwork on December 30, 2026, but the shares or cash do not post to the Roth account until January 2, 2027, the IRS treats it as a 2027 conversion. Custodians also set internal processing cutoffs in mid-to-late December, so an order placed on the final business day can slip into the next 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 large brokerages publish a same-day cutoff on December 31, such as a late-afternoon Eastern deadline, after which a request rolls to the next year. Because these cutoffs and settlement mechanics differ by firm, the year-end processing schedule is specific to each custodian. The sequence others commonly describe for keeping a conversion inside the intended year has three parts:
- The custodian’s year-end conversion cutoff date and time, which it can supply in writing.
- Initiating the conversion several business days before that cutoff rather than on December 31.
- Verifying that the funds have posted to the Roth account and that a Form 1099-R is expected for the correct year.
Estimated taxes: the conversion deadline most people miss
A conversion adds ordinary income in the year it happens, and that tax can be due before you file. The federal system is pay-as-you-go, so a large Q4 conversion can trigger an underpayment penalty even if you pay in full by April. The related deadline is the fourth-quarter estimated payment, generally due January 15 of the following year (Source: IRS Form 1040-ES).
Underpayment penalties are usually avoided by meeting a safe harbor. The rules generally require paying in at least one of the following amounts through withholding and timely estimates (Source: IRS Form 1040-ES; IRS Topic No. 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 |
Timing within the year matters because estimated taxes are due each quarter. The quarter in which you convert determines when the tax on that income 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 |
One reason many people convert late in the year and then use withholding from a paycheck or an RMD to cover the tax is that withholding is treated as paid evenly across the year, which can soften a late-quarter timing problem. The mechanics vary by situation, so this is an area where confirming with a tax professional is common (Source: IRS Form 1040-ES).
Required minimum distributions come before a conversion
If you are old enough to take required minimum distributions, the RMD for the year must be satisfied before you convert. An RMD is not eligible to be converted, so the year’s required amount has to come out of the traditional IRA first, and both the RMD and the conversion still have to be handled by the December 31 deadline. This sequencing is easy to miss late in the year.
Practically, that means an RMD-age saver planning a December conversion is working against a compressed calendar: take the RMD, let it settle, then convert the additional amount, all before year-end cutoffs. Details on current RMD ages and amounts appear in the Q3 Advisors overview of required minimum distributions for 2026. Because a Roth IRA has no lifetime RMDs for the original owner, some savers convert partly to reduce future required distributions (Source: IRS Publication 590-B).
No income limit, and the conversion is permanent
There is no income limit on a Roth conversion. The income phase-outs some articles cite apply to direct Roth IRA contributions, not to conversions. For 2026, the ability to contribute directly to a Roth IRA phases out at modified adjusted gross income of $153,000 to $168,000 for single filers and heads of household, and $242,000 to $252,000 for married couples filing jointly (Source: IRS Notice 2025-67). Conflating those contribution limits with conversions is a common factual muddle, because anyone with a traditional IRA or an eligible plan balance can convert, regardless of income.
What you cannot do is undo it. Conversions made in 2018 or later cannot be recharacterized, a change enacted by the Tax Cuts and Jobs Act (Source: IRS Publication 590-A, 2025; IRS Retirement Plans FAQs regarding IRAs). Before 2018, a saver could reverse a conversion if markets fell or the tax bill came in higher than expected. That option is gone, which is a central reason the sizing decision is often made once, near year-end, when income is known.
The tax on a conversion is due at ordinary income rates for the conversion year. The source of the tax payment affects the result: using IRA money to pay the tax shrinks the amount that reaches the Roth and can create an early-distribution issue for those under 59½, whereas paying from outside taxable funds leaves the full converted balance in the Roth (Source: IRS Publication 590-A, 2025).
The 5-year rules and the pro-rata rule
Two clocks and one formula shape conversion planning. Each conversion starts its own five-year clock for penalty-free access to the converted principal, and that clock begins on January 1 of the conversion year (Source: IRS Publication 590-B). So a conversion completed on December 31, 2026, is treated as starting January 1, 2026, an extra reason the year-end date matters.
The pro-rata rule ties to your December 31 balance. If you hold both pre-tax and after-tax money across your traditional, SEP, and SIMPLE IRAs, the taxable share of any conversion is calculated using the total value of those accounts on December 31 of the conversion year, reported on Form 8606 (Source: IRS Instructions for Form 8606, 2025). You cannot isolate only the after-tax dollars.
This is the backbone of the backdoor Roth. In that approach, a saver makes a nondeductible traditional IRA contribution and then converts it. If other pre-tax IRA money exists on December 31, the pro-rata rule makes part of that conversion taxable rather than tax-free, which is why the year-end aggregate balance is the number that counts (Source: IRS Instructions for Form 8606, 2025).
How a conversion is taxed and reported
A conversion generates two forms. The custodian issues Form 1099-R showing the distribution from the traditional account, and the saver files Form 8606 to report the conversion and calculate the taxable portion (Source: IRS Instructions for Form 8606, 2025). The converted amount appears on Form 1040 for the conversion year, with the taxable share added to ordinary income.
Because the income is ordinary, a conversion stacks on top of wages, pensions, and other income. That interaction is why sizing a conversion against the year’s tax brackets is a frequent planning topic. For 2026, the standard deduction is $32,200 for married couples filing jointly, $16,100 for single filers, and $24,150 for heads of household, figures that anchor bracket-filling math (Source: IRS Rev. Proc. 2025-32). Contribution limits, which do not apply to conversions, are summarized in the Q3 Advisors guide to 2026 retirement contribution limits.
IRMAA and NIIT: the two-year echo
A conversion can raise two other costs that arrive later. Medicare’s income-related monthly adjustment amount (IRMAA) uses the modified adjusted gross income from the tax return filed two years earlier, so a 2026 conversion can raise 2028 Part B and Part D premiums (Source: SSA POMS HI 01101.020). A conversion that pushes 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 |
Source: SSA POMS HI 01101.020; 2026 standard Part B premium confirmed by CMS Fact Sheet, 2026 Medicare Parts A & B Premiums.
The Net Investment Income Tax is the second echo. The conversion amount itself is not net investment income, because distributions from IRAs and similar plans are excluded (Source: IRS Questions and Answers on the Net Investment Income Tax). The interaction is indirect: a conversion raises MAGI, and the 3.8% tax applies to the lesser of net investment income or the amount by which MAGI exceeds $200,000 single or $250,000 married filing jointly, thresholds that are not indexed for inflation (Source: 26 U.S.C. 1411; IRS Topic No. 559). A larger conversion can therefore expose other interest, dividends, or capital gains to the 3.8% tax. See the Q3 Advisors explainers on 2026 Medicare IRMAA brackets and the Net Investment Income Tax for 2026.
Work with Q3 Advisors
Q3 Advisors is a registered investment adviser focused on retirement tax planning. This article is educational and is not advice; for guidance on your own circumstances, consult a qualified tax or financial professional.
Frequently asked questions
If I convert to a Roth, can I reverse the conversion if the taxes are more than I expected?
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, 2025). Before 2018, a saver could reverse a conversion. Today the transaction is permanent, which is why many people wait until income is known before deciding how much to convert.
If I convert as part of a backdoor Roth strategy, is my conversion taxable?
It depends on your other IRA balances. If a nondeductible contribution is your only IRA money, little or no tax may apply. But the pro-rata rule uses the total value of your traditional, SEP, and SIMPLE IRAs on December 31 of the conversion year, so existing pre-tax dollars make part of the conversion taxable (Source: IRS Instructions for Form 8606, 2025).
How can I convert my SIMPLE IRA assets?
SIMPLE IRA assets can generally be converted to a Roth IRA, but a two-year clock applies. During the first two years of participation in a SIMPLE plan, measured from the first contribution, those assets generally cannot be converted (Source: IRS Publication 590-A, 2025). After the two-year period, a SIMPLE IRA can be converted like other traditional IRA money, subject to ordinary income tax.
Can I convert individual stocks or mutual funds from my IRA to a Roth?
Yes. A conversion can be done in cash or in kind, meaning specific securities such as individual stocks or mutual fund shares move directly from the traditional IRA to the Roth IRA without being sold first. Custodian procedures vary, so an in-kind conversion generally requires confirming that the receiving Roth account can hold the same securities.
If I convert shares of stock in my IRA to a Roth, how is the conversion value calculated?
The taxable amount is the fair market value of the shares on the date of the conversion, not what you originally paid for them. That valuation sets the ordinary income reported for the conversion year and appears on Form 1099-R and Form 8606 (Source: IRS Instructions for Form 8606, 2025). Because the taxable amount is fixed by the market value on the conversion date, a lower share price on that date corresponds to a lower reported amount.
How do I know how much to convert without jumping tax brackets?
Bracket-filling generally starts from your projected taxable income for the year, then measures the room left inside your current bracket before the next rate applies. The 2026 standard deduction ($32,200 married filing jointly, $16,100 single) anchors that math (Source: IRS Rev. Proc. 2025-32). Because a conversion is permanent, this sizing is often modeled before converting, and IRMAA and NIIT thresholds are watched alongside brackets.
Can a Roth conversion raise my Medicare premiums later?
It can. IRMAA surcharges use MAGI from two years earlier, so a 2026 conversion can raise 2028 Part B and Part D premiums (Source: SSA POMS HI 01101.020). Crossing a tier boundary raises the full surcharge for that year. For a single filer in 2026, the first tier begins above $109,000 of MAGI ($218,000 married filing jointly).
What mistakes can make my conversion count for the wrong tax year?
The most common cause is settlement timing: a request placed in late December that posts in January counts for the new year. Custodian year-end cutoffs, unsettled trades, and holiday processing delays all contribute. A conversion stays inside the intended tax year when it settles on or before December 31, so the custodian cutoff and the number of business days a transfer takes to settle are the details that determine the year (Source: IRS Instructions for Form 8606, 2025).
Sources
IRS, Instructions for Form 8606 (2025): https://www.irs.gov/instructions/i8606
IRS, Publication 590-A (2025): https://www.irs.gov/publications/p590a
IRS, Publication 590-B (2025): https://www.irs.gov/publications/p590b
IRS, Retirement Plans FAQs regarding IRAs: https://www.irs.gov/retirement-plans/retirement-plans-faqs-regarding-iras
IRS, Form 1040-ES and Topic No. 306 (estimated tax): https://www.irs.gov/forms-pubs/about-form-1040-es
IRS, Notice 2025-67 (2026 plan limits): https://www.irs.gov/pub/irs-drop/n-25-67.pdf
IRS, Rev. Proc. 2025-32 (2026 inflation adjustments): https://www.irs.gov/pub/irs-drop/rp-25-32.pdf
IRS, Questions and Answers on the Net Investment Income Tax: https://www.irs.gov/newsroom/questions-and-answers-on-the-net-investment-income-tax
26 U.S.C. 1411 (NIIT): https://www.law.cornell.edu/uscode/text/26/1411
SSA POMS HI 01101.020 (2026 IRMAA): https://secure.ssa.gov/poms.nsf/lnx/0601101020
CMS Fact Sheet, 2026 Medicare Parts A & B Premiums and Deductibles: https://www.cms.gov/newsroom/fact-sheets/2026-medicare-parts-b-premiums-deductibles
