How Are Roth Conversions Taxed?

A Roth conversion is generally treated as a distribution from the source account followed by a movement into Roth. Previously untaxed dollars are included in income and are generally taxed at ordinary income rates rather than capital-gains rates.

Because the federal income tax is progressive, added income may occupy more than one bracket. The conversion can also affect deductions, credits, net investment income calculations, state income tax, and other income-based thresholds. A marginal bracket is useful context, not a complete tax estimate.

Nondeductible Traditional IRA contributions create basis—money that has already been taxed. When a person has basis across Traditional, SEP, and SIMPLE IRAs, the taxable portion of a distribution or conversion is generally calculated across the applicable IRA balances rather than by labeling one account as the after-tax account.

Prior Forms 8606 help establish basis history. Missing or inaccurate records can change the calculation, so the basis question should be resolved before relying on an estimated taxable amount.

The United States uses a pay-as-you-go system. A conversion can create a need for additional wage or pension withholding, estimated tax payments, or another payment approach. Waiting until the return is filed may produce a balance due and, in some cases, an underpayment penalty.

Withholding tax from the retirement distribution reduces the amount that reaches the Roth account. For someone under age 59½, an amount withheld rather than converted may also raise early-distribution questions. Payment method and timing therefore deserve separate review.

A prior tax return, current pay and pension information, realized gains, charitable plans, retirement distributions, estimated Social Security, IRA basis records, and state residence all provide context. Medicare coverage and marketplace health-insurance credits may introduce separate income thresholds.

An online questionnaire can show why these inputs matter, but it should not represent its projection as a filing calculation or a recommended conversion amount.