Is a Roth conversion worth it for you?

Strip away the vocabulary and a Roth conversion is one decision. Move money out of a tax deferred account, pay ordinary income tax on it now, and never pay tax on it again.

That makes it a bet. You're wagering that the rate you pay today is lower than the rate those dollars would face if you left them alone. Everything else is detail about how to size the bet and whether you're likely to win it.

The short answer. Convert when three things are true. Your rate today is genuinely lower than the rate those dollars will face later. You can pay the tax from outside the account. And the conversion doesn't push your income across a line that costs more than the bracket.

Otherwise, wait.

The comparison that settles it.

Compare two rates: what a conversion costs you this year, and what those same dollars would cost when they eventually come out.

The second number is where people go wrong, because they compare against their current bracket rather than the bracket those dollars will actually face. Three things usually push the future rate higher than expected.

Required withdrawals arrive whether you want them or not. The IRS sets out the rules in Publication 590-B. Under current law the starting age depends on your birth year: 73 for those born 1951 through 1959, and 75 for anyone born in 1960 or later. Once they begin, the withdrawal is ordinary income stacked on top of Social Security and everything else.

The survivor files alone. A married couple eventually becomes one person at tighter brackets, often carrying similar required income. That alone can move the future rate up a full bracket.

Your children inherit the tax bill. An inherited retirement account generally has to be emptied within ten years, as ordinary income. That often lands in your children's highest earning decade, at their top rate. If the money is going to them rather than being spent, their rate is the one that matters.

Run those three and the future rate is often higher than today's, which is the whole case for converting.

The years the answer is usually yes.

The opportunity is concentrated, not spread evenly.

The clearest window is between the last paycheck and the first required withdrawal. Income is often the lowest it's been in decades, nothing is forced, and the whole choice is yours. We cover using that window in which account you should draw from first.

Other years worth a look:

• A sabbatical or career gap
• A year with a large business loss
• The year before a big income event, rather than the year of it
• Any year a market decline has lowered account values, which lets you convert the same shares for less tax

When the answer is no.

Converting is a mistake more often than the enthusiasm around it suggests.

When your current rate is genuinely higher. If you're in peak earning years and expect much lower income later, converting now pays the top rate to avoid a lower one.

When the tax has to come from the account. Paying the conversion tax out of the converted balance shrinks the amount that gets the benefit and defeats much of the point. If you can't pay from outside funds, convert less or wait.

When you'll need the money soon. The benefit compounds. A conversion you'll spend in three years has barely had a chance to work.

When it crosses a line that costs more than the bracket. This is the one people miss most.

The lines a conversion can trip.

A conversion raises your income for the year, and several costs are triggered by income level rather than bracket, including the net investment income tax and the rate on your capital gains.

Medicare premium surcharges. In 2026 the surcharge begins above $109,000 for single filers and $218,000 for joint filers, and it's based on your income from two years earlier. So a conversion at 63 shows up as a higher premium at 65. It steps up in jumps, which means a single dollar over a line costs the same as being well over it. Both figures change annually; the SSA publishes the current rules for higher-income beneficiaries, and there's more in how to avoid the Medicare surcharge.

How much of your Social Security is taxed, which rises with other income.

Your capital gains rate, which depends on where ordinary income sits.

The surtax on investment income, above certain levels.

None of these appear in a bracket table. Together they mean the real cost of a conversion is often higher than the marginal rate suggests. The practical work is finding the amount that fills your available room without crossing the next edge.

How much, and how often.

The useful question isn't whether to convert. It's how much to convert this year.

That amount is the gap between your current taxable income and the top of whatever line you've decided not to cross. Fill it deliberately, then do it again next year.

A series of moderate annual conversions across a decade usually works better than one large one, though a single conversion in one unusually low income year can beat it. Each year gets sized against that year's actual income.

Which means a conversion strategy isn't a single decision. It's an annual one, and it needs someone looking at it each autumn while there's still time to act. The work is never finished, and that's the point rather than a caveat.

Nothing here sits on its own.

A conversion touches your Medicare premium, your capital gains rate, your charitable plan, your children's inheritance, and how much you can spend. Decide it in isolation and it will interact with all of them anyway, just without anyone having chosen how.

That's why it belongs inside one plan, which is what how we work describes.

Five things to check first.

1. What will my taxable income be when required withdrawals begin, and how does that compare with this year?
2. If one of us were filing alone, what rate would our required income face?
3. Can I pay the conversion tax from outside the account?
4. What will my income two years from now do to my Medicare premium?
5. Are these dollars for me to spend, or for my children to inherit? Whose rate matters?

Conversions also have a hard deadline: the window closes when required withdrawals begin, and it doesn't reopen. That's the argument in which money decisions get more expensive the longer you wait.

Cosmos Wealth doesn't provide tax or legal advice, and nothing here is a recommendation for your circumstances. Ages, thresholds, and rates are set by statute and change. Confirm current figures with your CPA before converting anything, or talk to us about what your own numbers say.