A Roth conversion moves money from a traditional retirement account into a Roth account. It can trade a tax bill today for tax-free qualified withdrawals later. Whether that trade works depends on more than the account balance.
What is a Roth conversion?
A Roth conversion transfers eligible money from a traditional IRA or another eligible retirement plan to a Roth IRA. Unlike a regular Roth IRA contribution, a conversion does not have an income limit. The IRS confirms that taxpayers may be able to convert regardless of adjusted gross income.
Money that has never been taxed is generally included in your income for the year of the conversion. After-tax IRA contributions can make part of a conversion nontaxable, but the calculation looks across your traditional IRAs rather than letting you select only after-tax dollars.
The conversion does not erase tax. It changes when you pay it.
When can a Roth conversion make sense?
A conversion may make sense when your tax rate today is lower than the rate you expect to pay on future withdrawals. That opportunity can appear after retirement but before required minimum distributions begin, during a business loss year, or whenever taxable income falls temporarily.
It may also help when you want to reduce future traditional account balances. Traditional IRAs eventually require distributions, while an original Roth IRA owner has no lifetime required minimum distributions under current rules.
These are reasons to model a conversion, not automatic reasons to complete one:
| Situation | Why a conversion may help | What to check first |
|---|---|---|
| Lower-income year | More income may fit within a planned tax range | Other income expected before year-end |
| Large traditional balance | Smaller future balances may mean smaller required distributions | Age, spending needs, and future tax rates |
| Cash outside retirement accounts | Tax can be paid without reducing the converted amount | Effect on the rest of your financial plan |
What taxes can a Roth conversion create?
The taxable part of a conversion is ordinary income in the conversion year. It can push other income into a higher tax bracket and may affect income-based items such as Medicare premiums, tax credits, or the tax on investment income.
If you have made nondeductible IRA contributions, Form 8606 tracks your basis and calculates the taxable share. Do not assume one IRA can be converted in isolation. Traditional, SEP, and SIMPLE IRA balances can affect that calculation.
Set aside cash for federal and any applicable state tax before converting. Withholding tax from the conversion leaves less money in the Roth account and can create an additional tax issue for someone under age 59½. Paying from cash outside the retirement account may avoid that problem, but only if doing so does not weaken your emergency reserve or near-term financial plan.
How much should you convert?
The useful question is usually how much to convert, not whether to convert everything. Start with a year-end tax projection that includes wages, business income, investment gains, deductions, credits, and any retirement withdrawals.
Then compare several conversion amounts. A smaller conversion may fill a target tax range without spilling far into the next one. A larger conversion may still be reasonable if future required distributions or expected tax rates make the upfront cost worthwhile. If retirement spending has begun, model the conversion alongside which accounts will fund withdrawals.
The investment decision matters too. Selling investments solely to pay conversion tax can create capital gains. A conversion also changes which account holds each investment, so the portfolio should still match your risk and spending plan afterward.
When should you wait or skip it?
Wait when current income is unusually high, the tax would drain cash needed soon, or you expect a clearly better conversion window. Also pause if the conversion could reduce a valuable credit or raise a near-term Medicare premium enough to change the result.
A conversion made in 2018 or later cannot be reversed through recharacterization. If required minimum distributions apply, that year’s distribution must come out first because an RMD is not eligible for rollover.
The bottom line
A Roth conversion can improve long-term flexibility when the tax paid today is reasonable compared with the tax avoided later. The amount should come from a coordinated tax projection and retirement plan, not a rule of thumb.
Santafino’s fee-only fiduciary wealth management firm and CPA firm can evaluate the investment move and its tax return impact together before the conversion becomes permanent.
FAQ
Is there an income limit for a Roth conversion?
No. Income limits can restrict direct Roth IRA contributions, but they do not prevent you from converting eligible traditional retirement money to a Roth IRA.
Can you undo a Roth conversion?
No. A Roth conversion made in 2018 or later cannot be recharacterized back to a traditional IRA. Review the amount before the conversion is completed.
Can a required minimum distribution be converted to a Roth IRA?
No. A required minimum distribution is not eligible for rollover. If you owe one for the year, take it before converting additional eligible retirement money.
