Here’s what 30-plus years in this business has taught me: By the time April arrives, the game is over. You’re not planning at that point. You’re reporting. Every number on that return was decided by what you did, or didn’t do, before the ball dropped on New Year’s Eve.

Which means the tax season that actually matters started a couple of weeks ago, and it ends Dec. 31. About 15 weeks. That’s the window.

You finally know the rules. Use them

For years, one excuse for doing nothing was genuinely reasonable: Nobody knew what the tax code would look like. The 2017 rates were scheduled to expire, Washington kept arguing, and plenty of smart people told me they’d plan “once things settle down.”

Things settled down. The One Big Beautiful Bill Act made the current brackets permanent, seven of them running from 10% to 37%. The standard deduction sits at $16,100 for singles and $32,200 for couples in 2026. If you’re 65 or older, there’s an extra $6,000 deduction per qualifying person on top of that, though it phases out as income climbs and it’s scheduled to vanish after 2028.

So the uncertainty excuse is gone. You know this year’s brackets. You know next year’s will look nearly identical. There has rarely been a better environment for deliberately choosing which year your income lands in.

The move that only works before New Year’s

The single most valuable move in that window, for a lot of retirees, is a partial Roth conversion. You take a measured slice of your traditional IRA, pay tax on it now at a rate you can see and calculate, and move it into an account where it grows tax-free and never faces a required distribution.

The deadline is Dec. 31. Not April 15. A conversion has to be completed inside the calendar year to count for that year, and unlike a contribution, there’s no grace period into spring.

And here’s the part that surprises people: Since 2018, conversions are permanent. There’s no undo button, no recharacterization, no calling the custodian in February to say you changed your mind. You measure twice and cut once, which is exactly why you don’t want to attempt this on Dec. 28 while the grandkids are visiting.

Filling the bracket, not blowing through it

The craft is in the sizing. Say you’re a married couple, retired at 64, living on savings and a modest pension while you delay Social Security. Your taxable income might be low enough that the 12% bracket has thousands of dollars of unused room. A conversion sized to fill that bracket, and stop, moves money out of your silent partnership with Uncle Sam at a discount you may never see again.

Convert too much and you don’t just climb a bracket. You can trip the Medicare IRMAA surcharge, which starts at $109,000 of income for singles and $218,000 for couples and works like a cliff. One dollar over costs the same as $10,000 over. And because IRMAA looks back two years, a sloppy conversion this fall shows up as a higher premium in 2028, when you’ve long forgotten what caused it.

That’s why the people who do this well do it in the fall. October and November are late enough that you can estimate the year’s income with real accuracy, and early enough that the paperwork clears without a panic.

The quiet years don’t announce themselves

If you’re between your last paycheck and age 73, you are living through the lowest-tax stretch of your adult life, whether you realize it or not. Wages have stopped. Required minimum distributions haven’t started. Every fall in that stretch is a one-time-use coupon, and each one expires Dec. 31.

I’ve written before about the three buckets, taxable, tax-deferred, and tax-free, and conversions are how most retirees actually build that third bucket. Fixed Index Annuities can hold the middle bucket steady while you do it: Principal isn’t exposed to market losses, growth is linked to an index rather than invested in it, and nothing forces a sale at a bad time while you’re deliberately drawing the tax-deferred pile down. They’re long-term contracts with surrender periods, so they’re for money with a job, not money you’ll want back next spring. But that stability is what lets you convert on your schedule instead of the market’s.

Utah keeps score by income, too

Remember that our flat 4.45% applies to every converted dollar, first to last. There’s no low state bracket to hide in. More important, Utah’s retirement tax credit, worth up to $4,545, goes in full to single filers under $54,000 and joint filers under $90,000. A conversion that shoves you past those lines doesn’t just cost federal tax. It can claw back a state credit you were counting on.

None of this is a reason to sit still. It’s a reason to run the numbers while the leaves are turning instead of while the snow is melting.

Fifteen weeks. A tax return you can still change. That combination doesn’t come around twice a year.

Lyle Boss, The REAL BOSS Financial, a native Utahn and retirement specialist who has spent decades helping families across Utah and the Mountain West build secure, income-focused retirement plans. Boss Financial, 955 Chambers St. Suite 250, Ogden, UT 84403. Telephone: 801-475-9400. https://www.safemoneylyleboss.com.