The Roth Conversion Window Is Closing And Most People Are Not Paying Attention

The 2017 Tax Cuts and Jobs Act is scheduled to sunset at the end of 2026 and tax brackets are set to reset to higher levels on January 1, 2027. For anyone sitting on a traditional IRA, an old 401k from a past employer or a pretax rollover account, this year may be the best Roth conversion opportunity of the decade. The math is simple but the window is real, and most people I talk to have no idea the clock is running.

Here is what the sunset actually does. The current seven bracket structure with a top marginal rate of 37 percent was set in 2017 and was always scheduled to expire at the end of 2025. Congress extended it by one year in late 2024 as part of a broader year end deal, which pushed the sunset to the end of 2026. If Congress does not act again this year, on January 1 of next year the brackets revert to the pre 2017 structure. The 12 percent bracket goes back to 15 percent. The 22 percent bracket goes back to 25. The 24 percent bracket jumps to 28. The top rate returns to 39.6 percent.

For most middle income households, that means a meaningful jump in the marginal tax rate on any taxable income above the current bracket thresholds. A married couple filing jointly with taxable income of 150,000 dollars is currently in the 22 percent bracket. Under the old brackets, they would be in the 25 percent bracket. That is a three point swing on the last dollar of income and it has real consequences for decisions like Roth conversions.

A Roth conversion is when you take money from a pretax retirement account, pay tax on it now, and move it into a Roth IRA where future growth and withdrawals are tax free. The benefit depends entirely on your current tax rate versus your expected future tax rate. If you believe your future rate will be higher, a conversion now at today's lower rates makes sense. If you believe it will be lower, you are better off leaving the money where it is.

Under the current brackets, a household in the 22 percent zone can convert a meaningful chunk of pretax money this year and pay 22 percent on the conversion. Under the old brackets that same conversion would cost 25 percent. That three point difference, compounded over 20 or 30 years of tax free growth inside a Roth, can easily add tens of thousands of dollars to retirement wealth depending on the size of the account.

The strategy has some guardrails. First, you need cash outside of the retirement account to pay the conversion tax. Paying it out of the converted balance defeats most of the benefit because you lose the tax free growth on the money used for taxes. Second, you need to be careful about stacking too much income in a single year. A large conversion can push you into a higher bracket, trigger additional Medicare surcharges or affect your ACA premium subsidies if you are buying insurance on the exchange. Third, the conversion is irrevocable, so once you pull the trigger you cannot undo it.

For most households the right approach is not a single massive conversion but a series of targeted partial conversions sized to fill up the current bracket without spilling into the next one. A household with room at the top of the 22 percent bracket might do a 30,000 dollar conversion this year, fill the rest of the bracket with next year's conversion, and so on. The goal is to move as much money as possible at today's rates before the brackets reset.

The calendar matters. Conversions must be processed by December 31 to count for the current tax year. That sounds like plenty of runway, but custodians get overwhelmed in the last two weeks of the year. Most tax professionals I talk to are already telling clients to complete any 2026 conversions by the middle of November at the latest. Waiting until the last week of December is asking for paperwork problems.

There is also a political dimension to all of this. If Congress extends the current brackets again, the urgency disappears. Both parties have signaled interest in some kind of deal but the politics are complicated and an election year makes big tax legislation harder to move. The honest answer is that nobody knows what will happen. The safer move is to plan as if the sunset is real and adjust if the rules change.

If you have a traditional IRA, a SEP IRA, a SIMPLE or an old 401k you have not touched, talk to your CPA or financial advisor this spring. Run the numbers. Look at your current bracket, your expected retirement bracket, your cash position and your time horizon. The window to act is open now. After January 1, 2027, it may be substantially more expensive to move the same money.