Roth Conversions 2026: Taxes and the Five-Year Rules
September 29, 2026
Roth Conversions in 2026: The Tax Bill, the Trade-Offs, and the Two Five-Year Rules
A practical guide to conversion taxes, after-tax basis, withdrawal timing, and the records that matter
Featured illustration: Moving retirement money to a Roth IRA can create a tax cost today.
A retirement account can change its tax treatment without changing the investments inside it. That is the basic idea behind a Roth conversion: eligible money moves from a traditional IRA to a Roth IRA, and the previously untaxed portion generally becomes ordinary income for that year. [1]
The appeal is future flexibility. Qualified Roth IRA withdrawals are tax-free, and the original owner has no lifetime required minimum distributions from the Roth IRA. But those features do not make every conversion beneficial. The current tax cost, the source of money used to pay it, and the timing of future withdrawals all matter. [2]
Key takeaways
- A conversion is different from an annual contribution. High income can restrict direct Roth contributions without prohibiting a conversion. [3]
- After-tax IRA basis can make part of a conversion nontaxable, but the calculation generally combines your traditional, SEP, and SIMPLE IRAs. [4]
- The five-year rule for qualified withdrawals and the five-year rule for early access to converted amounts are separate tests. [5]
- A required minimum distribution cannot be converted, and a completed conversion cannot be undone through recharacterization. [1,3]
| Accuracy and date scope: This guide addresses federal rules for an owner converting a traditional IRA in 2026. It is not a guide to inherited IRAs or in-plan Roth conversions. Examples are hypothetical; use the final forms for the year being filed. |
What gets taxed when you convert?
If an IRA contains only deductible contributions and investment earnings, its conversion is generally fully taxable. If it also contains nondeductible contributions, that after-tax amount is called basis. Basis is not taxed again, but it must be documented and allocated under the IRA rules. [1,4]
A transfer directly between custodians, or between accounts with the same custodian, is an available conversion method. A direct transfer does not make a taxable conversion tax-free. It simply changes how the money moves. [1]
| Illustrative tax estimate: Suppose a $30,000 conversion is entirely taxable and every additional dollar falls in a 22% federal marginal bracket. The simplified tax cost is $6,600 ($30,000 × 22%). This is not a quote for a real return: brackets, deductions, credits, state taxes, and other income-related effects can change the result. |
The pro-rata rule: one account is not the whole picture
Opening a separate IRA for nondeductible contributions does not usually isolate that money for a tax-free conversion. Form 8606 generally considers all of the owner’s traditional IRAs together, including traditional SEP and SIMPLE IRAs. The calculation uses year-end IRA values along with relevant distributions and conversions, not just the balance of the account being converted. [4,6]
| Hypothetical input | Amount |
|---|---|
| Documented after-tax basis before the conversion | $30,000 |
| Year-end value of all relevant traditional IRAs | $240,000 |
| Conversion during the year; no other distributions | $60,000 |
| Simplified calculation base: $240,000 + $60,000 | $300,000 |
| Nontaxable percentage: $30,000 ÷ $300,000 | 10% |
| Nontaxable portion of conversion: $60,000 × 10% | $6,000 |
| Taxable portion: $60,000 − $6,000 | $54,000 |
Table note: Original calculation applying the Form 8606 structure. Assumes no outstanding rollovers, new contributions, QCDs, repayments, or other adjustments. Actual Form 8606 instructions control. [4,6]
After-tax basis must be traced across the relevant IRAs, not just the account being converted.
In this example, converting $60,000 does not use all $30,000 of basis. Only $6,000 is recovered; $24,000 remains for later distributions. The example shows why the same proposed conversion can have a very different tax result depending on the rest of the IRA records. [6]
A conversion can affect more than the tax bracket
Medicare’s income-related monthly adjustment amount, or IRMAA, generally uses adjusted gross income plus tax-exempt interest from two years earlier. A taxable 2026 conversion can therefore affect 2028 premiums under the usual lookback. That is a timing implication, not a prediction of 2028 thresholds or an assurance that a surcharge will apply. [7]
For someone receiving Social Security, additional taxable income can also increase the portion of benefits included in federal taxable income, up to 85% of benefits. This is not an 85% tax rate on benefits. It is a separate income-inclusion calculation that can change the effective cost of adding conversion income. [8]
The useful comparison is a whole-return estimate with and without the conversion. “I am in the 22% bracket” is not enough if the added income also changes other tax calculations. Nor does a lower-income retirement year automatically prove that paying tax now is better than paying it later.
Two five-year clocks, two different questions
The first clock asks whether a Roth IRA withdrawal is qualified and therefore fully tax-free. For the usual retirement-age case, the owner must be at least 59½ and the five-tax-year period must be satisfied. It begins January 1 of the first tax year for which the owner funded any Roth IRA, including by conversion. A newly opened empty account does not start it. [4,5]
The second clock concerns the 10% additional tax on early withdrawals of converted amounts. Each conversion year has its own five-year period, starting January 1 of that year. If a withdrawal before age 59½ reaches the taxable portion of a recent conversion, the additional tax can apply unless an exception applies. Reaching 59½ is an exception to that additional tax; it does not by itself complete the first clock for earnings. [5]
A tax-free-earnings test and an early-distribution penalty test should not be treated as one rule.
| Example at age 67: An owner funds their first Roth IRA through a conversion in November 2026. The qualified-distribution clock starts January 1, 2026 and is satisfied January 1, 2031. Before then, earnings withdrawn may be taxable even though the owner is over 59½. Previously taxed conversion principal is not taxed a second time. [4,5] |
Ordering matters too. Nonqualified Roth IRA withdrawals generally come first from regular contributions, then conversions and rollovers in chronological order, and finally earnings. Within a conversion year, the taxable portion comes before the nontaxable portion. The withdrawal’s tax result depends on which layer it reaches, not just how long the newest account has existed. [5]
Before the transfer: RMDs, tax payments, and finality
If a required minimum distribution applies, satisfy that obligation separately; it is not eligible for conversion. A Roth conversion does not replace the year’s RMD. [1]
Money withheld from an IRA distribution for taxes is money that does not enter the Roth account unless replaced. Amounts not converted can be taxable and, before age 59½, may face the additional early-distribution tax. Distinguish the gross IRA distribution, the amount arriving in the Roth, and the separate tax-payment plan. [1]
Federal tax is pay-as-you-go. A conversion may require adjusted withholding or estimated payments during the year. Owing enough at filing can create an underpayment penalty even if the eventual tax bill is paid by the return deadline; timing and applicable exceptions matter. [9]
Finally, current law does not allow a post-2017 Roth conversion to be recharacterized back into a traditional IRA. A later market decline does not create an ordinary “undo” option. This makes checking the tax projection before authorizing the transfer especially important. [3]
A practical conversion review checklist
- List the relevant IRA balances and recover prior Forms 8606 before calculating basis. [4,6]
- Separate any RMD from the amount eligible to move to a Roth IRA. [1]
- Compare a smaller conversion, a larger conversion, and no conversion using consistent assumptions.
- Include Social Security taxation and the possible later Medicare effect in the comparison. [7,8]
- Record the first Roth funding year and each conversion year; identify money needed soon. [5]
- Document how taxes will be paid and retain custodian confirmations, Form 1099-R, Form 5498, and Form 8606 as applicable. [4,9,10]
Frequently asked questions
Does a conversion count against my annual Roth contribution limit?
A conversion is not a regular annual contribution. The contribution-limit calculation excludes conversions, although the converted amount can still create taxable income. [1]
Must everyone wait five years to withdraw any Roth money?
No. Contributions, conversions, and earnings have different treatment. Age, exceptions, ordering rules, and the relevant five-year period determine the outcome. [5]
Can I convert only part of an IRA?
Yes. Partial conversions are allowed. The taxable amount still depends on basis and the applicable aggregation rules. [1,4]
Is conversion automatically better before retirement?
No. The decision depends on present and future tax costs, cash needs, time horizon, and the assumptions used. The tax rules allow a conversion; they do not establish that it will improve every outcome.
Final takeaway
A Roth conversion is a decision about when to recognize income, not a shortcut around tax. The clearest starting point is an accurate basis calculation, a whole-return comparison, and a written record of the two timing rules. Those checks turn a broad idea into a decision that can be evaluated without relying on slogans.
Claim notes and fact-checking record
| Verification scope: Conversion eligibility, taxation, basis aggregation, withdrawal ordering, five-year rules, RMD restrictions, and reporting were checked against IRS guidance. Medicare timing was checked against SSA. All example arithmetic was recalculated; hypothetical results are not personalized recommendations. |
| Marker | Primary-source support |
|---|---|
| [1] | IRS: Publication 590-A — Conversion methods, income recognition, contribution limits, and amounts not eligible for conversion. |
| [2] | IRS: Roth IRAs — Qualified distributions and the original owner’s lifetime holding rules. |
| [3] | IRS: Topic 309, Roth IRA contributions — Income does not itself bar conversion; post-2017 conversions cannot be recharacterized. |
| [4] | IRS: Instructions for Form 8606 — Basis, aggregation, Roth qualification, and conversion reporting. Use the version for the filing year. |
| [5] | IRS: Publication 590-B, Roth IRA distributions — Separate five-year periods, exceptions to additional tax, and distribution ordering. |
| [6] | IRS: Form 8606 — Primary calculation structure used for the original pro-rata example. |
| [7] | SSA: Medicare premiums for higher-income beneficiaries — IRMAA income definition and usual two-year tax-return lookback. |
| [8] | IRS: Publication 915 — Income-based calculation of taxable Social Security benefits. |
| [9] | IRS: Topic 306, underpayment of estimated tax — Pay-as-you-go tax requirements and underpayment considerations. |
| [10] | IRS: 2026 instructions for Forms 1099-R and 5498 — Distribution and IRA contribution/conversion information reporting. |
| Educational use only: This article provides general education, not individualized tax, legal, investment, or insurance advice. Laws, agency guidance, plan terms, and individual circumstances can change. Use the official materials for the applicable year and facts. |