The question isn’t simply whether your tax rate will be lower later. It’s whether the tax you would pay to convert now is less than the total taxes that money would generate over the rest of your life, and your heirs’ lives, if you leave it where it is. Answering that takes year-by-year, tax-aware modeling, not a rule of thumb.

What happens when you convert?

You move money from a traditional IRA to a Roth IRA. The pre-tax amount you convert is added to your taxable income for that year. In exchange, qualified withdrawals from the Roth are tax-free later, and a Roth IRA has no required minimum distributions during the owner’s lifetime. There is no income limit on conversions. A conversion can’t be undone, so the decision is final once it’s made.

Why “Will my tax rate be lower later?” isn’t enough

Comparing today’s bracket with a guess about a future one leaves out what usually decides the answer.

  • The money keeps growing. If the account grows well over the decades ahead, the future tax applies to a much larger balance, not to today’s amount.
  • Required minimum distributions aren’t optional. They begin at age 73 for many of today’s retirees, and the required share of the account rises each year. Stacked on Social Security and other income, a well-grown account can push you into a higher bracket than you expected, in amounts you don’t choose.
  • Income has side effects. More income can raise Medicare premiums and the share of Social Security that is taxed, so the real cost of each added dollar can be higher than your bracket suggests.
  • Circumstances change. A surviving spouse usually files as a single taxpayer with narrower brackets, and heirs pay tax on inherited IRA withdrawals at their own rates, often within ten years.

Model the decision year by year

A sound decision compares two projections of your retirement: one with the conversion and one without. Each follows your income, investment growth, required distributions, tax brackets, Medicare premiums, and taxes year by year, then carries forward to your spouse and heirs. The difference in total taxes paid and after-tax wealth left, across all those years, is what answers the question. We build these projections in your financial plan and coordinate the numbers with your CPA.

When can converting make sense?

  • Lower-income years. The years between retirement and the start of required distributions or Social Security often leave room to convert at a lower cost.
  • A long time horizon, which gives tax-free growth longer to work.
  • Paying the tax from other savings, so the full converted amount stays invested.
  • A large traditional IRA whose future required distributions could push your income higher late in retirement.
  • Heirs in higher tax brackets. Most beneficiaries other than a spouse must empty an inherited IRA within ten years. Withdrawals from a traditional IRA are taxable to them; qualified Roth withdrawals are not.
  • Planning for the survivor. See What happens to my retirement taxes after one spouse dies?

When might it not make sense?

  • The modeling shows the tax on converting now outweighs the future taxes it would avoid.
  • You would have to pay the tax out of the IRA itself, which shrinks what reaches the Roth.
  • You may need the converted money within five years. Each conversion has its own five-year period, and before age 59½, withdrawing converted amounts early can bring a 10% penalty.
  • You plan to leave the IRA to charity, which won’t owe income tax on it.

Does it have to be all at once?

No. Many people convert in pieces over several years, choosing each year’s amount from the projections rather than from a fixed rule. That spreads the tax out and lets you reassess as markets, tax law, and your plans change.

Questions to answer before you convert

  • What would the conversion cost in taxes this year, all in?
  • How large could this account grow, and what would required distributions look like at 75, 85, and beyond?
  • How will I pay the tax?
  • Could the extra income raise my Medicare premiums two years from now?
  • When will I need this money?
  • Who is likely to inherit the account, and what is their tax situation?
  • How does my state tax the conversion?

Frequently asked questions

Can I undo a Roth conversion?
No. Conversions made after 2017 can’t be reversed (recharacterized).
Does Barrett Capital prepare tax returns?
No. We model the planning decision and work alongside your CPA or tax preparer, who files your return.

General educational information, not individualized investment, legal, or tax advice. Tax rules change; consult your tax advisor about your situation.