Roth IRA Conversion Calculator

How This Roth Conversion Calculator Works

This calculator helps you understand the financial tradeoff of a Roth IRA conversion. Here's what happens when you click "Calculate":

The Tax Cost Today

When you convert money from a Traditional IRA to a Roth IRA, the converted amount is added to your taxable income for the year. The calculator multiplies your conversion amount by your current marginal tax rate to estimate the federal tax you would owe. For example, converting $100,000 at a 24% tax rate would cost $24,000 in taxes.

Growth Comparison

The calculator projects how both options grow over time using your expected annual return. For the Traditional IRA, the full balance grows tax-deferred. For the Roth IRA, the converted amount (after paying tax) grows tax-free. The key difference comes at withdrawal: Traditional IRA withdrawals are taxed at your retirement tax rate, while Roth withdrawals are completely tax-free.

Finding the Break-Even Point

The break-even point is when your net position with the Roth (account value minus the conversion tax you paid) exceeds the after-tax value of keeping the Traditional IRA. This comparison assumes you pay the conversion tax from funds outside the IRA.

What the Results Mean

If the break-even happens well before retirement, a conversion likely makes sense. If it happens after age 85 or never, keeping the Traditional IRA may be better. However, this is a simplified analysis. Create a free RetirePlanAI account to factor in your complete financial picture, including multiple accounts, income sources, and tax optimization strategies.

Understanding Roth IRA Conversions

A Roth IRA conversion is a strategic move that shifts money from a Traditional IRA (or other pre-tax retirement account) into a Roth IRA. Understanding the mechanics helps you make better decisions.

What Happens in a Conversion

When you convert, the money moves from your Traditional IRA to a Roth IRA. The converted amount is treated as ordinary income in the year of conversion. You pay taxes at your current marginal rate, but from that point forward, the money grows tax-free and can be withdrawn tax-free in retirement (after age 59 1/2 and meeting the 5-year rule).

The 5-Year Rule

Each Roth conversion has its own 5-year clock. You must wait 5 years from January 1 of the conversion year before you can withdraw the converted amount penalty-free (if you are under 59 1/2). However, the earnings on conversions can always be withdrawn tax-free after age 59 1/2, regardless of the 5-year rule.

Why People Convert

The primary reason people convert to a Roth IRA is to pay taxes at a known rate today in exchange for tax-free growth and withdrawals in the future. Conversions often make sense if you expect your effective tax rate on withdrawals to be higher later due to Required Minimum Distributions (RMDs), Social Security income, or tax law changes.

Other benefits include eliminating RMDs on converted balances, improving estate planning outcomes, reducing future tax uncertainty, and creating tax diversification by holding assets across taxable, tax-deferred, and tax-free accounts.

Partial Conversions

You do not have to convert your entire Traditional IRA at once. Many people do partial conversions over several years to stay within lower tax brackets. This "Roth conversion ladder" strategy can significantly reduce the total tax paid. Sign up for RetirePlanAI to model multi-year conversion strategies.

When Does a Roth Conversion Make Sense?

A Roth conversion is not right for everyone. Here are the situations where it typically makes the most financial sense:

You Expect Higher Taxes in Retirement

If you believe tax rates will increase (either due to legislation or your own income growth), paying taxes today at a lower rate is advantageous. This is especially relevant for high earners who may face Required Minimum Distributions that push them into higher brackets.

You Have a Long Time Horizon

The longer your money can grow tax-free, the more valuable the conversion becomes. A 45-year-old converting has 40+ years of tax-free growth ahead, while a 70-year-old has less time to benefit. Time is the key ingredient that makes Roth conversions work.

You Are in a Temporarily Low Tax Bracket

If you have a year with unusually low income, such as between jobs, early retirement before Social Security, or a business loss, that is an ideal time to convert. You are essentially getting a discount on the conversion tax.

You Want to Eliminate RMDs

Traditional IRAs require you to take Required Minimum Distributions starting at age 73. Roth IRAs have no RMDs during your lifetime. If you do not need the money, converting eliminates forced withdrawals that could push you into higher tax brackets or affect Medicare premiums.

Estate Planning Goals

Roth IRAs pass to heirs tax-free (though they must be distributed within 10 years under current rules). If leaving a tax-free inheritance is important, converting now shifts the tax burden from your heirs to you.

When a Roth Conversion Might NOT Make Sense

Despite the benefits, there are clear situations where a Roth conversion can hurt your finances:

You Expect Lower Taxes in Retirement

If your retirement income will be significantly lower than your current income, you may be paying taxes at a higher rate today than you would in retirement. In this case, keeping assets in a Traditional IRA and paying taxes later at a lower effective rate is often the better option.

You Cannot Afford the Tax from Outside Funds

Roth conversions are generally most effective when the tax bill is paid using money outside the IRA. If you must use IRA funds to pay the tax, you reduce the amount that continues compounding tax-advantaged. If you are under age 59 1/2, the portion withdrawn to pay taxes may also be subject to a 10% early-withdrawal penalty.

You Need the Money Within 5 Years

If you are under age 59 1/2 and may need access to the converted funds within five years, a Roth conversion can trigger penalties. Each conversion has its own 5-year holding period, and withdrawing converted amounts too early can result in a 10% penalty.

You Are Close to Medicare Enrollment

Large Roth conversions increase your taxable income and can trigger IRMAA (Income-Related Monthly Adjustment Amount) surcharges, significantly raising Medicare Part B and Part D premiums. Because Medicare uses a two-year lookback, conversions after age 63 can affect premiums for multiple years.

You Are Already in a Very Low Tax Situation in Retirement

If your retirement income is low enough that most Traditional IRA withdrawals fall within the standard deduction or the lowest tax brackets, Roth conversions may provide little benefit. In these cases, Traditional withdrawals can already be highly tax-efficient.

What This Calculator Does NOT Include

This calculator provides a useful starting point, but retirement tax planning is complex. Here are important factors this simple tool cannot model:

State Taxes

State income taxes vary dramatically from 0% in states like Texas and Florida to over 13% in California. Your state tax situation significantly affects the conversion decision. Some states do not tax retirement income at all, which could change the math entirely.

IRMAA and Medicare Premiums

High-income retirees pay extra for Medicare through IRMAA surcharges. A large conversion could trigger these surcharges for 2 years, costing thousands of dollars. This calculator does not model IRMAA thresholds or their impact on the conversion decision.

Social Security Taxation

Up to 85% of Social Security benefits can be taxed based on your combined income. Roth conversions add to your income and can increase Social Security taxation. The interplay between conversion income and Social Security taxation is not modeled here.

Multi-Year Conversion Strategies

Most financial advisors recommend spreading conversions over multiple years to stay within lower tax brackets. This calculator only analyzes a single-year conversion. A multi-year strategy could result in significantly lower total taxes paid.

Tax Bracket Boundaries

This calculator uses a flat marginal tax rate, but real taxes work in brackets. A conversion could push part of your income into a higher bracket, making the effective rate higher than your input. Bracket-aware analysis requires more detailed modeling.

What You Actually Need

For an accurate Roth conversion analysis, you need a tool that considers your complete financial picture: all income sources, tax brackets, state taxes, Medicare impacts, and multi-year strategies. RetirePlanAI provides comprehensive analysis including Monte Carlo simulations, AI coaching, and tax-optimized withdrawal strategies.