Should You Do a Roth Conversion? Four Questions to Ask First.

Few retirement topics generate as much excitement — and as much bad advice — as the Roth conversion. Done at the right time, for the right reasons, it can lower the taxes you pay over your lifetime, shrink the tax bill your children inherit, and give you a pool of money that will never be taxed again. Done carelessly, it can push you into a higher bracket, raise your Medicare premiums, and hand the IRS money you never needed to give them.

The difference is almost never luck. It's planning. So rather than tell you whether you should convert — which no honest article can, because it depends entirely on your numbers — let's walk through the four questions that actually determine the answer.

First, what a Roth conversion actually is

A conversion simply moves money from a traditional IRA or 401(k) — where every dollar is taxed when you eventually withdraw it — into a Roth IRA, where qualified withdrawals are tax-free for the rest of your life. You pay ordinary income tax on whatever you convert in the year you convert it. In exchange, that money grows tax-free from then on, and it is not subject to required minimum distributions.

Put plainly: you're choosing to pay a known tax bill today to avoid an unknown, possibly larger, tax bill later. Whether that's a good trade comes down to the four questions below.

Question 1: What's your tax rate now versus later?

This is the whole game. A conversion makes sense when the rate you'll pay on the money today is lower than the rate you (or your heirs) would pay on it later. If you expect to be in a lower bracket for the rest of your life, converting may just prepay a tax you'd never have owed at that rate.

The catch is that most people underestimate their future rate. Three forces tend to push retirement income — and therefore tax rates — up over time:

• Required minimum distributions. Under current law, once you reach RMD age (73 for most people retiring today, rising to 75 later this decade), the IRS forces a growing percentage out of your traditional accounts each year, whether you need the money or not.
• The loss of a spouse. When one spouse passes, the survivor usually files as single the following year — often on similar income but with roughly half the brackets and standard deduction. This "widow's penalty" quietly raises the rate on the very accounts you were planning to spend down slowly.
• Where tax law is headed. No one can predict future rates, but today's brackets are historically moderate. Filling up the lower brackets now, while they're available, is a way of not betting your whole plan on rates staying put.

Question 2: Where will the tax money come from?

This question separates a good conversion from a bad one faster than any other. The tax you owe on a conversion should ideally be paid from outside the retirement account — from a taxable brokerage or savings account — not by withholding part of the conversion itself.

Here's why. If you convert $50,000 and hold back $12,000 to cover the tax, only $38,000 actually reaches the Roth. You've shrunk the very asset you were trying to grow tax-free, and if you're under 59½, that withheld amount can even count as an early withdrawal. When the tax is paid from other funds, every dollar converted goes to work for you. If covering the tax bill would drain your emergency savings or force you to sell investments at a bad time, that's usually a sign to convert less, or wait.

Question 3: What else does your income touch?

A conversion doesn't happen in a vacuum. Because it adds to your taxable income for the year, it can quietly trigger costs that have nothing to do with your tax bracket:

• Medicare premiums (IRMAA). Cross certain income thresholds and your Medicare Part B and Part D premiums rise — and because Medicare looks back two years, a large conversion at 63 can raise your premiums at 65.
• How your Social Security is taxed. Additional income can increase the share of your Social Security benefits subject to tax.
• Capital gains rates and other thresholds. Extra ordinary income can spill long-term capital gains from the 0% rate into a taxed one, and affect other income-based calculations.

None of these are reasons not to convert. They're reasons to size the conversion carefully — to fill a bracket up to a line, not blow past it. This is the part a good tax projection handles and a rule of thumb does not.

Question 4: Who is this really for — you, or the people after you?

The math changes depending on the goal. If the aim is your own lifetime tax bill, the answer lives in the bracket comparison above. But if part of your estate is likely to pass to children, the calculus shifts.

Under current rules, most non-spouse heirs must empty an inherited IRA within ten years — often during their own peak earning years, at their own top tax rate. A traditional IRA left to a high-earning child can be taxed heavily on the way out. A Roth passes to them tax-free. For families where legacy matters, converting during your lower-income years can be one of the most efficient gifts you leave behind.

So — should you?

If you take one thing from this, let it be this: a Roth conversion is not a product you buy or a box you check. It's a multi-year strategy that should be sized to your brackets, funded from the right account, and checked against everything else your income touches. The retirees who benefit most rarely convert everything at once — they convert deliberately, a bit each year, in the years that make sense.

The goal was never to pay zero tax. It was to pay the least tax over your whole life — and that's a math problem worth doing carefully.

If you're weighing a conversion and want to see the actual numbers for your situation — your brackets, your gap years, the effect on Medicare and Social Security — that's exactly the kind of question we work through with clients. You're welcome to start a conversation; there's no cost and no pressure.