Quick Read – Beyond the $24,500 deferral limit, the $72,000 total 401(k) cap leaves room for after-tax contributions that can roll immediately into tax-free Roth accounts. – Six years of mega backdoor Roth contributions plus strong market returns grew roughly $360,000 in…
incipal into $750,000 for a Bay Area software engineer. – SECURE 2.0 forces workers with over $150,000 in 2025 FICA wages to make Roth-only catch-up contributions in 2026, eliminating the $1,900 immediate tax break. – A software engineer at a large Bay Area employer posted on Reddit last winter that she had quietly accumulated a sizable Roth balance over six years without ever earning under the income cap that blocks direct Roth IRA contributions. She did it inside her 401(k), using the after-tax sleeve most plans bury three menus deep
If you are 50 or older, earning well into six figures, and already maxing the standard deferral, this is the mechanic that changes your retirement tax picture more than any other. The number most high earners never use The 2026 employee deferral limit is $24,500. That is the figure your HR portal puts in front of you.
The real ceiling sits much higher. The IRS caps total annual additions to a single 401(k), meaning your deferral plus employer match plus any after-tax contributions, at $72,000 in 2026. The gap between those two numbers is the door.