Yes. The taxable part of a Roth conversion counts as ordinary income in the year you convert. Pretax contributions and earnings are generally taxable; after-tax basis is not taxed again. The conversion is not earned income, and it can affect more than your tax bracket—including Medicare premiums and taxes on other investments.
The short answer: yes, and what that means for your tax bill this year
A conversion moves money from an eligible pretax retirement account to a Roth. You pay any tax due on the transfer now in exchange for the Roth’s treatment of future qualifying withdrawals.
The taxable amount generally increases adjusted gross income, or AGI, and taxable income. It is not wages, does not create compensation for an IRA contribution, and generally is not subject to payroll tax.
A larger conversion does not move every dollar you earn into a higher bracket. Tax rates apply in layers. Suppose you have $10,000 of room left in a 22% bracket and convert $30,000 of entirely pretax money, with the remaining $20,000 in a 24% bracket. The conversion’s ordinary federal income tax is $7,000: $2,200 plus $4,800, before any other effects. Your existing lower-bracket income keeps its lower rates.
What gets taxed, and what doesn’t
Pre-tax contributions
Money contributed before income tax, or deducted on an earlier return, is generally taxable when converted. You are paying the income tax that was deferred when the money entered the account.
Investment earnings
Growth inside a traditional retirement account is generally taxable on conversion too. The fact that the account earned dividends or long-term stock gains does not give those converted earnings the lower capital-gains rate; the distribution follows retirement-account rules.
After-tax contributions
Nondeductible IRA contributions create basis: money you have already paid income tax on. Basis itself is not taxed again, but you cannot usually choose to convert only that part while leaving all the pretax IRA money behind.
The IRS generally combines your traditional, SEP, and SIMPLE IRAs and allocates basis proportionally. The Form 8606 instructions include year-end balances, conversions, and other relevant distributions in the calculation. A separate “after-tax IRA” does not avoid it.
If you are contributing nondeductible dollars and then converting them, the backdoor Roth example shows exactly how an old rollover IRA can make the conversion taxable. Employer-plan after-tax balances have different rollover rules; do not apply the IRA formula to every 401(k) transaction.
How a Roth conversion changes your income picture for the year
Estimate the full return with and without the conversion. Looking only at the marginal tax bracket can miss other costs.
| Item | How a taxable conversion can affect it |
|---|---|
| Ordinary income tax | More income fills the current bracket and may reach the next one |
| Net investment income tax | The conversion is not itself net investment income, but higher income can expose other investment income to the tax |
| Medicare premiums | Higher income can trigger an income-related premium adjustment, generally using a tax return from two years earlier |
| Direct Roth contribution eligibility | This test has its own definition of income and generally excludes conversion income |
| Other income-based benefits or deductions | Each uses its own income definition and thresholds |
The IRS net investment income tax guidance, Social Security’s Medicare-premium rules, and Roth contribution worksheet in Publication 590-A explain those distinctions.
For Medicare, a 2026 conversion can therefore matter to 2028 premiums. Future thresholds and your circumstances still need checking. A “low-income year” is only low after you include the conversion, capital gains, bonuses, and other household income.
Can you reverse a Roth conversion?
No. Conversions made in 2018 or later cannot be recharacterized back to a traditional IRA. A market decline after the conversion does not let you undo its taxable income.
That makes a partial conversion useful to evaluate. You do not have to convert the whole account in one transaction or one year. Model the amount before transferring it, then update the estimate if the year’s income changes.
The timing question: when does converting make sense?
A conversion may help when paying tax now costs less than the tax you or your heirs would otherwise pay later. Compare equal investments, time horizons, and the after-tax value of money used to pay the bill. Tax-free growth alone does not prove one choice wins.
A temporarily low-income year
A sabbatical, career change, or early-retirement year may create room at a lower rate. Check the actual projected return: severance, investment gains, or a spouse’s income can fill that room.
Before required minimum distributions begin
Converting reduces the pretax balance used to calculate future required minimum distributions, or RMDs. Once an RMD is due, that required amount cannot itself be converted; satisfy the distribution requirement before evaluating additional money for conversion.
Before a major increase in income
An expected sale or large bonus can make an earlier year worth comparing. The benefit depends on both years’ full tax pictures, not simply whether the conversion happens before the event.
For estate-planning reasons
Your beneficiaries’ likely tax rates and required withdrawal timetable can change the result. A Roth inheritance and a pretax inheritance are taxed differently, but the Roth does not remove every estate or beneficiary-distribution rule.
When you can pay the tax from outside funds
Paying the tax with outside cash lets more retirement money reach the Roth. It also uses cash that could have served another purpose. Compare that cost and keep enough for living expenses and tax payments.
Before converting, check the account’s rollover rules, your basis records, the full tax estimate, and the source of payment. SIMPLE IRAs generally have a two-year participation restriction. A current employer’s plan may also limit when money can leave it.