Multi-Year Roth Conversion Strategies: Filling Tax Brackets Without Overflowing Them

If you're sitting on a substantial traditional IRA balance, you've probably run into this tension: convert too much to a Roth IRA in one year and you risk pushing yourself into a higher tax bracket, but convert too little and you may leave money in an account that keeps growing, along with the tax bill attached to it. Required minimum distributions (RMDs) and Social Security income only add to that future tax liability.

A multi-year Roth conversion strategy, sometimes called "bracket filling," is one way to approach this tradeoff. Rather than converting a large sum all at once, you convert smaller amounts over several years, aiming to use up the room left in your current tax bracket each year without spilling into the next one up.

• Multi-year conversions aim to use available room in your current tax bracket each year rather than converting a lump sum that jumps you into a higher bracket.
• The "conversion window," the gap years between retirement and when Social Security or RMDs begin, is often when taxable income is temporarily lower and conversions may be more efficient.
• This is a modeling exercise that changes every year based on your actual income, deductions, and the tax code in effect that year.
• Coordinating investment and tax planning matters. A properly structured financial plan connects the dots between these two areas instead of treating them separately.
• This strategy is not one-size-fits-all. What makes sense depends on your specific income sources, account balances, and goals.

Every dollar you convert from a traditional IRA to a Roth IRA is added to your taxable income for that year. The U.S. tax system is progressive, meaning income is taxed in layers, or brackets, with each additional layer taxed at a higher rate. Bracket filling means estimating how much room you have left in your current bracket before the next, higher rate kicks in, then converting up to (but not over) that threshold.

In our experience, this is where a lot of the value gets lost if it's not planned carefully. Convert too aggressively in a single year and you may push yourself into a higher bracket for that entire additional slice of income. Spread it out instead, and you may be able to convert the same total amount over time while staying in a lower bracket each year.

Because tax brackets, standard deductions, and other thresholds are set by law and can change from year to year, the specific dollar amounts that define "how much room you have" should be confirmed each year rather than assumed. The IRS publishes official information on Roth IRAs, including conversion rules, and that is the right place to confirm current-year specifics rather than relying on a rule of thumb from a prior year.

For many retirees, there's a stretch of years, often between when they retire and when Social Security benefits start or RMDs begin, when taxable income is temporarily lower than it will be later. Once Social Security and RMDs are both in the picture, taxable income can rise meaningfully, sometimes pushing retirees into a higher bracket than they experienced during their working years.

Those lower-income years, if they exist in your situation, can represent a window of opportunity. Converting during that window means you might be paying tax on the converted amount at a lower rate than you would if you waited until RMDs and Social Security were both flowing in.

Is your retirement income plan built to take advantage of a window like this if one exists for you? That's a question worth asking well before RMDs begin, since the window can close gradually as other income sources phase in.

A multi-year conversion strategy requires revisiting the numbers annually. Your income, deductions, health care costs, and the tax code itself can all shift from one year to the next. What made sense to convert last year may not be the right number this year.

This is exactly the kind of decision where the left hand knowing what the right hand is doing pays off. Investment decisions and tax decisions are connected, not separate silos. When we work with clients on this kind of planning, we believe it's important to model out the numbers with a tax professional each year rather than relying on a single static plan built years in advance.

• Converting a large lump sum without modeling the bracket impact first
• Assuming last year's bracket thresholds still apply without checking current figures
• Ignoring how Social Security timing and RMDs will affect future taxable income
• Failing to account for the tax bill itself, which is due in the year of conversion, not later
• Treating the Roth conversion decision separately from the rest of the financial plan

If you have a meaningful traditional IRA balance and you're thinking ahead about lifetime tax planning, a multi-year conversion approach may be worth exploring, though it depends heavily on your specific numbers. Cannon Advisors and Cannon Tax & Accounting can model conversion scenarios together, connecting the investment side and the tax side so nothing falls through the cracks. If that sounds useful, schedule a call with us to talk through what your conversion window might look like.

Is a Roth conversion right for everyone with a traditional IRA? No. Whether it makes sense depends on your income, tax bracket now versus expected future brackets, and other factors specific to your situation. This is a suitability question best worked through with your advisor and tax professional.

Do I have to pay taxes when I convert? Yes. The amount converted is generally added to your taxable income for the year of the conversion. Confirm the specifics of how this applies to you with a tax professional.

What is the "conversion window"? It generally refers to years where taxable income is temporarily lower, often between retirement and when Social Security or RMDs begin. Not everyone has a window shaped this way; it depends on individual circumstances.

Can I convert different amounts each year? Yes. That's the core idea behind a multi-year strategy, adjusting the converted amount annually based on your current bracket and available room.

Does converting affect Medicare premiums? Income from a conversion can affect income-related figures used elsewhere in your financial picture. This is another reason to model conversions with a professional rather than in isolation.

Where can I find official rules on Roth conversions? The IRS Roth IRA page is the official source for current rules. Confirm specifics there or with your tax professional before acting.

Do RMDs still apply if I've converted some of my IRA to a Roth? RMD rules apply to the traditional IRA balance that remains. Converted amounts sitting in a Roth IRA are treated differently. Confirm your specific RMD obligations with a tax professional.

How often should I revisit my conversion plan? At least annually, since income, deductions, and the tax code can all change year to year.

Is this strategy guaranteed to save money on taxes? No strategy can guarantee a tax outcome. The goal is to manage the timing and size of taxable income in a given year, not to promise a specific result.

Who should I talk to before converting? Both your financial advisor and a tax professional. Coordinating the two is often where the real value in this kind of planning shows up.

• IRS, Roth IRAs