Roth Conversion Calculator & Tax Strategy Guide (2026)
Estimate how much you could convert from a Traditional IRA to a Roth IRA and explore the potential tax implications of a Roth conversion.
Last Updated:August 2026
This calculator reflects current 2026 federal income tax brackets and Roth conversion rules.
Reviewed by Susan Delaney
Educational use only.
Did you know?
Millions of Americans hold assets in Traditional IRAs and employer-sponsored retirement plans, making Roth conversion planning an important retirement tax strategy.
Estimate whether converting part of your traditional IRA to a Roth IRA could reduce your lifetime tax bill. This calculator provides an educational estimate based on current federal tax rules.
About the Author
Susan Delaney is the founder of Essential Retirement Guide and the author of retirement planning books covering Social Security, retirement taxes, IRAs and income planning. His educational resources are designed to explain complex retirement topics in plain English for American retirees.
How a Roth Conversion Works
A Roth conversion moves money from a tax-deferred retirement account into a Roth IRA. You pay tax now, but qualified withdrawals can generally be tax-free later.
Should You Convert Your Traditional IRA to a Roth IRA?
A Roth conversion can be one of the most valuable retirement tax planning strategies available—but it isn’t the right choice for everyone. Converting money from a traditional IRA or eligible retirement account into a Roth IRA means paying income tax on the amount converted today in exchange for the potential benefit of tax-free qualified withdrawals in the future.
For some retirees, converting part of an IRA over several years can reduce future Required Minimum Distributions (RMDs), lower lifetime taxes, simplify estate planning, and provide greater flexibility in retirement. For others, converting too much in a single year could push them into a higher tax bracket, increase Medicare premiums through IRMAA, or cause a larger portion of their Social Security benefits to become taxable.
That’s why understanding how much to convert can be just as important as deciding whether to convert at all.
Our free Roth Conversion Calculator is designed to help you estimate how much of your traditional IRA or 401(k) you may be able to convert during 2026 before moving into the next federal income tax bracket. While every retirement plan is unique, this educational calculator can help you explore different scenarios and understand how a Roth conversion may fit into your broader retirement strategy.
Whether you’re recently retired, approaching Required Minimum Distributions, or simply looking for ways to manage future taxes more efficiently, this calculator provides a useful starting point before discussing your options with a qualified financial or tax professional.
Roth Conversion at a Glance
Best for:
- Retirees in temporarily lower tax brackets
- People planning before Required Minimum Distributions begin
- Investors expecting higher future tax rates
- Those wanting greater tax flexibility during retirement
May not be suitable if:
- You need all of your retirement income immediately
- A conversion would push you into a significantly higher tax bracket
- It would trigger higher Medicare premiums
- You cannot comfortably pay the tax from non-retirement savings
Our calculator estimates:
What Is a Roth Conversion?
A Roth conversion is the process of transferring money from a traditional IRA, SEP IRA, SIMPLE IRA, or eligible employer-sponsored retirement plan into a Roth IRA. Unlike a regular Roth IRA contribution, there are no income limits preventing you from completing a Roth conversion, regardless of how much you earn.
The main difference is taxation.
Money held in a traditional IRA has generally not yet been taxed. When you convert part or all of that account to a Roth IRA, the converted amount is usually added to your taxable income for that year. Although this may increase your tax bill today, future qualified withdrawals from the Roth IRA—including investment growth—can generally be taken tax-free under current federal tax law.
Many retirees consider Roth conversions during years when their taxable income is lower than usual. Examples include the years immediately after retirement but before claiming Social Security benefits, or before Required Minimum Distributions begin. By converting smaller amounts over several years rather than one large conversion, it may be possible to reduce lifetime taxes while avoiding unnecessary jumps into higher tax brackets.
A Roth conversion is not simply about reducing this year’s taxes. Instead, it is often a long-term planning decision designed to improve tax efficiency over the course of retirement.
Roth Conversion Benchmarks: What’s Reasonable, What’s a Red Flag
The 2026 federal brackets for a married couple filing jointly, for reference:
| Bracket | 2026 Taxable Income Range (MFJ) |
| 22% | $100,800 – $211,400 |
| 24% | $211,400 – $403,550 |
| 32% | $403,550 – $512,450 |
Say a couple has $150,000 in taxable income before any conversion, comfortably inside the 22% bracket. The bracket ends at $211,400, leaving $61,400 of room.
| Conversion Size | Result |
| $61,400 (fills the 22% bracket exactly) | Entire conversion taxed at 22% — about $13,508 in federal tax |
| $100,000 (spills into the next bracket) | $61,400 taxed at 22% + $38,600 taxed at 24% — about $22,772 total, a 22.8% blended rate |
Neither number is wrong on its own — a larger conversion still moves more money into tax-free growth. The point of the benchmark is knowing which side of the line you’re on before you file, not after.
On the Medicare side: in 2026, modified adjusted gross income above $109,000 (single) or $218,000 (married filing jointly) triggers an IRMAA surcharge on Part B and Part D premiums two years later — often $80 or more per month, per person. A conversion large enough to cross that line in a year you’re also enrolled in Medicare (or will be within two years) is worth checking against this number specifically, not just against your tax bracket.
Frequently Asked Questions About Roth Conversions
Sources & References
This Roth Conversion Calculator and accompanying guide are reviewed regularly to reflect current federal retirement and tax rules. While every effort is made to keep the information accurate and up to date, tax legislation can change and individual circumstances vary. This calculator is intended for educational purposes only and should not be considered personalised financial, tax or legal advice.
The information on this page has been prepared using guidance from the following authoritative sources:
- Internal Revenue Service (IRS)
- Retirement Plans and Individual Retirement Arrangements (IRAs)
- IRS Publication 590-A – Contributions to Individual Retirement Arrangements (IRAs)
- IRS Publication 590-B – Distributions from Individual Retirement Arrangements (IRAs)
- IRS Revenue Procedure 2025-32 – 2026 Inflation Adjusted Tax Provisions
- Social Security Administration – Retirement Benefits and Tax Information
- Medicare.gov – Income-Related Monthly Adjustment Amount (IRMAA)
- U.S. Department of the Treasury
- SEC Investor.gov – Retirement Planning Resources
Last reviewed: August 2026
Traditional IRA vs Roth IRA
Understanding the differences between a Traditional IRA and a Roth IRA is essential before deciding whether a Roth conversion makes sense for your retirement plan. Although both accounts can help you save for retirement, they differ in how and when you pay tax.
| Feature | Traditional IRA | Roth IRA |
| Contributions | May be tax-deductible if eligible | Made with after-tax dollars |
| Taxes on Investment Growth | Tax-deferred | Tax-free for qualified withdrawals |
| Taxes When You Withdraw | Generally taxable as ordinary income | Generally tax-free if qualified distribution rules are met |
| Required Minimum Distributions (RMDs) | Yes, beginning at the applicable RMD age under current law | No lifetime RMDs for the original account owner under current law |
| Income Limits for Contributions | No income limit for making contributions, but deductibility may depend on income and workplace retirement plan coverage | Income limits apply to regular annual contributions |
| Income Limits for Roth Conversions | Not applicable | No income limits for completing a Roth conversion |
| Best Suited For | Individuals expecting to be in the same or a lower tax bracket during retirement | Individuals expecting to be in a higher tax bracket later or seeking tax-free qualified retirement income |
Which Account Is Better?
Neither account is universally better. The right choice depends on your current tax bracket, expected retirement income, estate planning objectives and how you expect tax laws to affect you in the future.
Many retirees use both account types as part of a broader retirement tax strategy. Having money in taxable, tax-deferred and tax-free accounts can provide greater flexibility when deciding where to withdraw income each year.
A Roth conversion is one way of gradually shifting retirement savings from tax-deferred accounts into tax-free accounts. Rather than converting an entire retirement account in one year, many people complete a series of smaller annual conversions to help manage taxes, Medicare premiums and future Required Minimum Distributions.
Common Roth Conversion Mistakes
Even a well-planned Roth conversion can become expensive if important tax rules are overlooked. Before converting retirement savings, watch out for these common mistakes.
Converting Too Much in One Year
A large Roth conversion could move you into a higher federal income tax bracket than expected. Many retirees instead convert smaller amounts over several years to help manage their annual tax liability.
Ignoring Medicare IRMAA Thresholds
Higher taxable income from a Roth conversion may increase your Medicare Part B and Part D premiums two years later. Before converting, consider whether your income could cross an IRMAA threshold.
Forgetting About Social Security Taxes
A Roth conversion may increase the percentage of your Social Security benefits that becomes taxable. If you have already started receiving benefits, this should form part of your planning.
Paying the Tax From Your IRA
Whenever possible, many financial professionals suggest paying the conversion tax from savings outside your retirement account. This allows more retirement assets to remain invested for potential future tax-free growth.
Waiting Until Required Minimum Distributions Begin
Many retirees find the years between retirement and the start of Required Minimum Distributions provide one of the best opportunities to consider Roth conversions while taxable income may be lower.
Assuming Everyone Should Convert
A Roth conversion is not automatically the right decision for every retiree. Factors including your expected retirement income, state taxes, Medicare, estate planning goals and future spending needs should all be considered before making a decision.
Related Retirement Tools
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