Most articles about Roth conversions answer one question: should you do them? 

That's an easy question. The harder one is to know when to stop.  

Roth conversions are powerful. Move money from a traditional IRA to a Roth IRA, pay the taxes now, and never pay taxes on the growth or withdrawals again. For the right person at the right time, this can save tens of thousands of dollars over a lifetime. 

But there's a point in every retiree's life when continuing to convert stops making sense. Knowing where that line matters as much as knowing when to start.

_{First, a quick reminder of why Roth conversions work}

The math comes down to one comparison: what tax bracket are you in now versus what bracket will you be in later? 

If you're in a lower bracket today than you'll be in once Required Minimum Distributions (RMDs) kick in at age 73, converting some IRA money now and paying tax at today's lower rate is usually a win. You're trading a smaller tax bill today for a much bigger tax bill later. 

That's why the typical Roth conversion sweet spot is the window between retirement (when income drops) and age 73 (when RMDs force income back up). A retiree who stops working at 65 might have eight years of low taxable income to work with, which means eight years to gradually move money from traditional IRA to Roth.

_{Five reasons to stop converting}

Here are the five most common situations where Roth conversions stop making sense even for retirees who've been doing them successfully for years.

_{1. You've hit a higher tax bracket than your future self will be in}

If your conversion amount this year would push you into the 24% bracket, but your projected RMDs only put you in the 22%bracket,you'vecrossed the line. You're now paying more tax today than you would have paid later. Stop or scale back.

_{2. You're approaching an IRMAA bracket}

Medicare Part B and Part D premiums increase sharply when your income crosses certain thresholds, called IRMAA brackets. A conversion that pushes you over one of these brackets can cost you $2,000 to$4,000 in additional Medicare premiums per year, per spouse, for two years. Sometimes the IRMAA cost erases the conversion benefit entirely.

_{3. You're within five years of needing the money}

Roth IRAs have a five-year rule for converted funds. If you convert money and then withdraw it within five years, you may owe a 10% penalty on top of the tax you already paid. Don't convert money, you'll need to spend soon.

_{4. You're planning a large charitable gift in retirement}

Qualified Charitable Distributions (QCDs) let retirees give directly from their traditional IRA to a charity, and the distribution doesn't count as taxable income. If you're planning to give meaningful amounts to charity, that money is more valuable left in the traditional IRA than converted to Roth.

_{5. Your heirs are in low tax brackets}

Roth conversions are partly about leaving tax-free money to your heirs. But if your beneficiaries are themselves in low brackets, then the inherited traditional IRA may not cost them much in taxes anyway. The conversion may have been done for nothing.

_{The decision is rarely all-or-nothing}

One of the most common misconceptions about Roth conversions is treating them as a yes-or-no decision. In practice, most retirees benefit from a multi-year plan that is adjusted annually. 

Some years you convert aggressively say, when one spouse stops working and household income drops temporarily. Other years you stop entirely may be the year you're already realizing capital gains from selling a property, or the year your bracket would otherwise tip into IRMAA territory. 

The strategy is dynamic. The answer changes year by year, depending on your income, your tax brackets, and your circumstances.

_{How we approach it}

When we work with retirees on Roth conversion strategy, we run a multi-year projection that model's income, brackets, IRMAA thresholds, projected RMDs, and state tax. We don't just answer "should you convert this year?" we answer, "what's the right amount over the next 5to 10 years?" 

Sometimes the answer is convert. Sometimes the answer is wait. Sometimes the answer is stop. The honest answer depends on your specific picture, and it changes every year. 

If you're in the conversion years and want to make sure, you're optimizing or if you've been converting for a while and aren't sure whether to keep going, that's the kind of analysis we run for our clients. Let us know if you'd like to talk about your situation.