Tangent Retirement · 401(k) planning tool · 2026 limits

How much more could your 401(k) hold this year?

Most people stop at the well-known limit on their own contributions. The IRS actually allows far more into a 401(k) each year, and a plan with the right features lets you fill that extra room with money that grows tax-free. Enter a few numbers to see what could be possible.

About you and your plan

$
$
% of pay
–
of extra room for a mega-backdoor Roth this year
–
Your contributions
–
Employer
–
Total possible

Filling the 401(k) to its real limit

$0
Your contributions Employer After-tax → Roth Unused
Total the IRS allows into the plan all sources combined · IRC 415(c)
Your contributions
Employer contribution
Room for after-tax contributions, converted to Roth
Standard approach
your contributions + employer
With the mega-backdoor Roth

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How the strategy works

A 401(k) has two limits. The one everyone knows caps what you put in from your paycheck. The larger one caps everything that goes into the account from any source. The gap between them is space most people never use. Plans that allow voluntary after-tax contributions let you fill it, and converting that money to Roth means the growth is never taxed again.

Step 1

Max your regular contributions

Fill your own limit first, pre-tax or Roth 401(k). Make sure you contribute enough each paycheck to collect the full employer match.

Step 2

Add after-tax contributions

Elect voluntary after-tax contributions, a separate bucket from Roth 401(k), up to the remaining room under the overall limit.

Step 3

Convert to Roth

Convert the after-tax money to Roth inside the plan (or roll it to a Roth IRA) promptly, so little or no earnings are taxed at conversion.

Not sure whether your plan allows it?

Send us your Summary Plan Description and we’ll tell you whether the mega-backdoor Roth is available to you and how to set it up.

Talk to Tangent Retirement
For illustration only. Figures assume the salary, contributions and plan features you entered and the IRS limits for the year shown; the overall limit is also capped at 100% of compensation. Catch-up contributions are not counted against the overall limit. Whether after-tax contributions and Roth conversions are available depends on your specific plan document. Tangent Retirement Inc. is a registered investment adviser. This is not tax or legal advice.