Your 401(k) Plan Has a Hidden Roth Door. Here’s How to Use It Before 2027

Quick Read

• High earners tin funnel an other $36,250 annually into a Roth by filling the spread betwixt the $72,000 IRS headdress and their deferrals and leader match.

• Only 24% of 401(k) plans let after-tax contributions, and adjacent less licence in-service Roth conversions. Both features are required for the strategy to work.

• Roth withdrawals don't number toward IRMAA MAGI, helping retirees debar Medicare surcharges of up to $6,936 per idiosyncratic annually triggered supra $218,000 associated income.

• Two retirees, aforesaid $1 million, aforesaid 4% rule, bargain 1 finished with $1.4 million, the different deed $0 successful 12 years. Our escaped scholar usher explains the flaw that separated them, and the income-first method built to debar it.

A 56-year-old bundle technologist connected the r/fatFIRE subreddit precocious laid retired a acquainted problem. She earns $310,000, already maxes her 401(k) deferrals and catch-up, funds a backdoor Roth IRA, and inactive has currency near implicit that lands successful a taxable brokerage. Her HR portal mentions "after-tax contributions" but she has ne'er utilized them. She wanted to cognize if that container was worthy checking.

For precocious earners with a compatible plan, checking that container is the azygous astir invaluable status determination disposable successful 2026. It tin propulsion an further $36,250 into a Roth relationship each year, connected apical of what already goes successful done payroll.

The Math Behind the $36,250

The IRS caps full yearly additions to a 401(k) nether Section 415(c) astatine $72,000 successful 2026. That ceiling covers everything hitting the plan: your pre-tax oregon Roth deferrals, the leader match, nett sharing, and after-tax contributions. Catch-up dollars beryllium supra this ceiling and bash not number against it.

Assume a emblematic high-earner scenario. Your Roth oregon pre-tax deferral hits the $24,500 worker limit. Your leader kicks successful a 5% lucifer connected a $225,000 salary. That leaves $36,250 of unused abstraction wrong the $72,000 wrapper.

The 4% Rule is Broken, Built On A World That No Longer Exists

Every retiree knows astir the 4% rule, but it frames status arsenic a dilatory liquidation and inactive causes retirees with seven-figure accounts to agonize implicit a meal out.

There's a antithetic mode to tally the mathematics that makes much consciousness today. Build an income floor — dividends, interest, and Social Security that screen your indispensable bills each period — and you ne'er person to merchantability shares into a down marketplace conscionable to wage them.

Our escaped scholar guide, The 4% Rule Is Broken, walks done it successful astir 15 minutes. Access the study here.

The after-tax bucket is what fills that space. You lend post-tax dollars up to the cap, past execute an in-plan Roth conversion oregon in-service rollover to a Roth IRA. The contributions themselves were already taxed, truthful the conversion moves cleanable principal. Once wrong the Roth, maturation compounds tax-free and qualified withdrawals ne'er spot the IRS again.