The IRS put out a reminder this week, timed to National Payroll Week, telling workers to pull up their last pay stub and check whether the right amount of federal tax is coming out. It’s the kind of notice that’s easy to scroll past, but this year it lands differently: the new deductions for overtime and tips don’t change a paycheck automatically, and the agency is essentially saying that a lot of people’s withholding is still set up as if those deductions don’t exist.
What the IRS actually said this week
The reminder, IRS release IR-2026-105, went out September 4, 2026, ahead of National Payroll Week, which runs September 7 through 11. National Payroll Week itself is mainly built around recognizing payroll professionals, but the IRS used the occasion to push what it calls a “paycheck checkup,” pointing workers to three specific tools: the Tax Withholding Estimator, Form W-4, and Publication 15-T, which employers use to calculate withholding amounts. The release, IR-2026-105, lists a handful of reasons someone should run the numbers again, including a recent tax-law change, a new job, marriage, divorce, or a birth or adoption in the family. It also flags a free webinar on September 8 aimed at payroll professionals, covering employment tax deposits, Trump Account employer contributions, and 2026 Form W-2 reporting changes.
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Why the overtime and tip deductions don’t fix withholding on their own
The tax-law change the IRS is almost certainly pointing to is the set of new deductions created by the One, Big Beautiful Bill Act, including the deduction for qualified overtime compensation. Separate IRS guidance issued in August, Fact Sheet FS-2026-13, spells out something that trips a lot of workers up: an employer is not allowed to reduce how much it withholds from a paycheck to account for that deduction unless the worker submits an updated Form W-4 that specifically accounts for it. So a worker who’s earning qualified overtime in 2026, and expects a real deduction on next year’s return, can still have too much held out of every paycheck between now and December, simply because nobody filed the paperwork that tells payroll to adjust for it.
The step that actually changes what comes out of your check
The 2026 Form W-4 includes an updated step 4(b), the deduction worksheet, specifically built to let a worker estimate the new overtime deduction and reduce withholding accordingly. The Tax Withholding Estimator, the same tool the IRS is highlighting this week, has also been updated to walk through that calculation rather than requiring a worker to do the math by hand. Filling either one out and handing a new W-4 to an employer is the only way to actually shift what’s withheld going forward; simply knowing the deduction exists, or seeing a bigger number on next year’s W-2 in box 12, doesn’t touch this year’s paycheck. That distinction is easy to miss, since the tax-law change and the withholding fix arrived through two separate IRS documents months apart.
Why the timing of this reminder matters
September isn’t a random month for a withholding check. It leaves enough of the year remaining that adjusting a W-4 now can meaningfully change the last several months of paychecks, but it’s late enough that most workers have a clear picture of their actual 2026 earnings, including whatever overtime they’ve logged so far. Wait until December and there’s little runway left to correct an under-withholding problem before the January filing season; wait until filing season itself and the only options left are a smaller refund, a balance due, or in some cases an underpayment penalty. The IRS reminder doesn’t spell out a specific dollar consequence, and this article isn’t estimating one for any individual household, but it’s structured around exactly that math: a check now, while paychecks are still coming, versus a surprise months from now with no more pay periods left to fix it.
Who else the reminder is aimed at
Overtime workers aren’t the only ones the IRS names. The release also lists a new job, marriage, divorce, and a birth or adoption as standing reasons for a checkup, regardless of the 2026 tax-law changes. Those are the same life events the Tax Withholding Estimator has always asked about, but the agency is bundling them into the same September reminder as the tax-law changes, which suggests it’s treating this as a general “check your paycheck” moment rather than a narrow notice aimed only at overtime earners. Anyone who’s had one of those changes in the past year, on top of any overtime or tip income, has more than one reason to run the numbers before the next pay period.
What payroll professionals are being told the same week
The IRS reminder isn’t aimed only at individual workers. It also promotes a free webinar on September 8 built for payroll professionals, covering federal employment tax deposit rules, how employer contributions to the new Trump Accounts for children should be handled, and the 2026 Form W-2 reporting changes that go along with the overtime and tip deductions. That’s a signal the reporting side and the withholding side of this year’s changes are landing on payroll departments at the same time as they’re landing on workers, which is part of why the IRS chose National Payroll Week specifically to put out the reminder rather than waiting for a slower rollout. A worker whose employer hasn’t fully sorted out the new box 12, code TT reporting yet may still be able to adjust withholding on their own by filing a new W-4, even if the employer-side reporting mechanics are still catching up.
What a paycheck checkup actually involves
The Tax Withholding Estimator asks for information most workers already have on hand: recent pay stubs, an estimate of year-to-date income, and any expected deductions or credits. For someone who’s earned qualified overtime in 2026, that now includes plugging in the expected amount of that overtime so the estimator can factor in the new deduction rather than treating all of the person’s pay as fully taxable. The tool then produces a recommended withholding amount, which a worker translates into entries on a new Form W-4 and hands to their employer’s payroll department. None of that requires guessing at a final number by hand, and none of it requires waiting for a W-2 that won’t exist until after the year is over. The reminder’s core message is that this check can happen now, mid-year, while there’s still time for the result to actually change what comes out of the next several paychecks.
This article was produced with AI assistance and reviewed by a human editor. Figures are linked to their primary sources; where a claim could not be verified from the public record, we say so.
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