A Roth IRA conversion means moving money from a pre-tax retirement account (traditional IRA, 401(k), or similar) into a Roth IRA. You pay income tax on the converted amount now, but all future growth and withdrawals are tax-free. Whether this makes financial sense depends heavily on your current tax situation, your projected future tax rates, and your timeline. Here is a complete guide to evaluating Roth conversions in 2026.
What Is a Roth IRA Conversion?
When you contribute to a traditional IRA or 401(k), you typically get a tax deduction for the contribution. The money grows tax-deferred, and you pay income tax when you withdraw in retirement. A Roth IRA works the opposite way — you contribute after-tax money, and qualified withdrawals in retirement are completely tax-free.
A Roth conversion lets you move money from the pre-tax bucket to the after-tax Roth bucket. You include the converted amount in your gross income for the year of conversion and pay tax on it at your ordinary income tax rate. After that, the money grows tax-free forever.
When a Roth Conversion Makes Sense
Your Current Tax Rate Is Low
Conversions make the most sense when you are in a low tax bracket now compared to where you expect to be in retirement. Common scenarios:
- Early retirement before Social Security begins, creating a low-income window
- A year with unusually low income due to a job loss, career break, or business loss
- Years after a major deduction event (large charitable contribution, business write-off) that reduces your taxable income
- Early career, when income and tax rates are lower than expected peak earning years
You Expect Higher Tax Rates in Retirement
If you have a large pre-tax retirement account and will have substantial required minimum distributions (RMDs), your retirement income could push you into a high tax bracket. Converting some of that pre-tax balance now at a lower rate locks in tax savings.
The Tax Cuts and Jobs Act Sunset
The 2017 Tax Cuts and Jobs Act (TCJA) lowered individual tax rates significantly. Many of its provisions are set to expire at the end of 2025 — meaning tax rates may revert to higher pre-TCJA levels in 2026 and beyond (though this depends on Congressional action, which is uncertain as of this writing). If rates do increase, converting now at lower 2026 rates could be advantageous.
You Want to Reduce RMDs
Traditional IRAs and pre-tax 401(k)s are subject to Required Minimum Distributions starting at age 73 (as of current law). RMDs force you to withdraw money whether you need it or not, which can push you into a higher tax bracket and affect Medicare premiums. Roth IRAs are NOT subject to RMDs during the owner’s lifetime. Converting pre-tax assets to Roth reduces future RMDs and gives you more flexibility in retirement.
You Want to Leave Tax-Free Money to Heirs
Under the SECURE Act 2.0, most non-spouse beneficiaries must withdraw inherited IRAs within 10 years. If your heirs are in high earning years when they inherit, a Roth IRA may be significantly more valuable than a traditional IRA because all distributions are tax-free.
When a Roth Conversion Does NOT Make Sense
- You are currently in a high tax bracket and expect to be in a lower bracket in retirement.
- You cannot pay the conversion tax from non-retirement funds. If you have to withdraw extra from your IRA to pay the taxes, you lose compound growth on those additional dollars and may face an early withdrawal penalty (if under 59½).
- You need the money within 5 years. Roth conversions are subject to a 5-year rule — converted amounts must stay in the Roth for 5 years before they can be withdrawn penalty-free.
- You are in a high-income year due to a bonus, stock vesting, or business sale. Adding conversion income on top could push you into an even higher bracket.
How to Calculate Whether a Conversion Makes Sense
The break-even analysis compares:
- The tax you pay today on the conversion
- The estimated future tax savings from tax-free growth and tax-free withdrawals
A simplified approach: compare your current marginal tax rate to your estimated retirement marginal tax rate. If you are in the 22% bracket now and expect to be in the 32% bracket in retirement, converting today at 22% clearly makes sense on the amount that would otherwise be taxed at 32%.
A more sophisticated analysis accounts for the time value of money, projected account growth, state taxes, and the impact of conversions on Medicare premiums and Social Security taxation. Many financial planning software tools and fee-only financial advisors can run these projections.
Partial Conversions: Fill the Bracket
You do not have to convert your entire traditional IRA at once. A common strategy is to convert just enough each year to fill the top of your current tax bracket without jumping into the next one.
For example: if you are in the 22% bracket and your taxable income would need to rise by $30,000 to hit the 24% bracket, you convert $30,000 worth of traditional IRA this year. Next year, you assess again. This “bracket filling” approach spreads conversion taxes over many years and keeps each conversion at a manageable cost.
State Tax Considerations
Not all states treat Roth conversions the same way. Some states follow federal rules; others have unique rules around retirement income. If you are considering a large conversion, check your state’s treatment of conversion income — especially if you live in a high-tax state like California or New York where state income tax rates can add 9-13% on top of federal rates.
If you plan to move to a no-income-tax state (like Florida, Texas, or Nevada) in retirement, that is another argument against converting heavily now while you are still a resident of a high-tax state.
Roth Conversion and Medicare IRMAA
Medicare Part B and Part D premiums are income-tested through the Income-Related Monthly Adjustment Amount (IRMAA). Large Roth conversions can push your MAGI above IRMAA thresholds, significantly increasing your Medicare premiums in the following year. This is a major consideration for people aged 63 and older (since Medicare uses income from 2 years prior).
How to Execute a Roth Conversion
- Contact your IRA custodian — most allow conversions online or by phone.
- Specify the dollar amount or percentage to convert.
- Decide whether to withhold taxes. Most advisors recommend NOT withholding taxes from the conversion itself, but instead setting aside funds from non-retirement accounts to cover the tax bill in April.
- Consider making an estimated tax payment if the conversion will significantly increase your tax liability to avoid underpayment penalties.
- Report the conversion on your federal tax return using Form 8606 (if any basis is involved) and include the converted amount in your gross income.
Final Thoughts
A Roth conversion is not automatically a good idea — it requires careful analysis of your current and projected future tax situation. But for the right person at the right time, it is one of the most powerful tax planning tools available. The most common high-value opportunities are low-income years before retirement income begins, during early retirement before Social Security and RMDs, and any year when temporary tax circumstances push you into an unusually low bracket. When in doubt, consult a fee-only financial advisor or CPA who can model the conversion scenarios specific to your situation.