Retirement accounts quietly and suspiciously shift when tax law changes, and 2026 brings one of the biggest scheduled shifts in years. Anyone with a 401(k) needs to understand what actually changes, what headlines exaggerate, and what smart planning looks like before the calendar flips.
The key driver behind all the noise sits inside the expiration of major portions of the Tax Cuts and Jobs Act. Congress passed that law in 2017, and many of its individual tax provisions expired after December 31, 2025. Unless lawmakers rewrite those rules, tax brackets, deductions, and credits revert to pre-2018 levels in 2026. That shift does not directly raid retirement accounts, but it absolutely changes how much tax someone pays when drawing from one.
