Should I do Roth conversions?
Retirement
A Roth conversion can make sense when its current tax cost is reasonable compared with the tax and flexibility benefits you expect later. Model the household's full tax picture and liquidity needs before choosing an amount.
A lower-income year can create an opportunity, but a conversion is not automatically the right move.
Separate a conversion from an annual contribution
A conversion moves eligible retirement assets to a Roth account. Previously untaxed amounts generally become taxable income in the conversion year. It is not simply an extra annual Roth contribution, and the contribution income limits do not by themselves bar a conversion.
A conversion does not guarantee that every later withdrawal is tax-free. Roth holding-period, age, and distribution rules still matter. Ask your tax professional to evaluate these separately if you may need the money soon.
Compare tax cost now with likely withdrawal years
Potential opportunities include a lower-income year, early retirement before required distributions, or a temporary business-income decline. Compare no conversion, a partial conversion, and a larger amount using the same household assumptions.
Hypothetically, a fully taxable $40,000 conversion taxed entirely at a 22% federal marginal rate would add $8,800 of federal tax. Actual tax may cross brackets, include state tax, or change other benefits. This is arithmetic, not a recommendation that everyone fill a particular bracket.
Include costs beyond the tax bracket
Additional income may affect Medicare income-related premiums, marketplace insurance subsidies, taxation of Social Security, deductions, and other income-based rules. Medicare usually looks back to an earlier tax year, so a conversion's effect can appear later.
Identify how you will pay the tax without jeopardizing essential cash. Using retirement funds to pay it can reduce the amount reaching the Roth and may create additional early-distribution tax exposure. Compare the full result, not just the converted balance.
Check IRA basis and distribution restrictions
If you have nondeductible traditional IRA contributions, do not assume you can convert only the after-tax dollars while ignoring other traditional, SEP, or SIMPLE IRA balances. Form 8606 uses aggregation and basis calculations that can make part of the conversion taxable.
Required minimum distributions are not eligible for conversion. Have the custodian and tax professional confirm any distribution that must occur first, the taxable amount, and the records needed for Form 8606.
Choose deliberately because the tax decision cannot simply be undone
Under current rules, conversions made after 2017 cannot be recharacterized back to traditional IRAs. A later market decline does not automatically undo the tax bill. Smaller staged conversions can be compared with a single large conversion, without assuming either is always better.
Before the year-end processing deadline, confirm income estimates, the source of tax payments, custodian instructions, and projected reporting. Reassess each year rather than following a fixed conversion amount regardless of circumstances.
What people often get wrong
- Comparing only marginal tax brackets and ignoring benefit or premium effects
- Ignoring nondeductible IRA basis and aggregation rules
- Assuming a conversion can be reversed after a market decline
- Converting money needed soon without checking distribution rules
What to think about next
- Collect IRA basis records and projected household income.
- Ask for no-conversion and partial-conversion tax projections.
- Confirm liquidity, distribution requirements, and custodian deadlines before acting.
When to consider working with a CFP®
Working with a CFP® can help when these decisions feel intertwined, taxes, investments, cash flow, and life goals tend to move together, and a planning relationship can offer structure, prioritization, and accountability over time.
Frequently Asked Questions
Can I convert in a high-income year?
A conversion may be allowed, but the tax cost could be substantial. Eligibility to convert does not establish that it is beneficial.
Can I reverse a conversion?
Conversions made after 2017 cannot be recharacterized back to a traditional IRA. Confirm the consequences before authorizing the transaction.
Sources and further reading
- IRS: Form 8606 and nondeductible IRA basis
- IRS: IRA FAQs, conversions and recharacterizations
- IRS: distributions eligible for rollover
Talk to a CFP® who works with high earners.
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