Stack Play #2: How to Build a Tax-Free Retirement Bucket When You've "Maxed Out" Your 401(k)

You did the right thing. You maxed your 401(k).

You hit the $24,500 employee contribution limit for 2026. Maybe you also maxed your IRA — or tried to, only to find out your income disqualifies you from contributing to a Roth directly. You’re following every piece of conventional retirement advice, and yet you have a growing sense that you’re still leaving something significant on the table.

You are.

There’s a door inside your 401(k) that most high earners don’t know exists. Behind it is the ability to funnel an additional $47,500 per year — or more — into an account that grows completely tax-free and comes out tax-free in retirement.

This is the Mega Backdoor Roth. And if you read Stack Play #1 and implemented an S-Corp structure, you may already have the cash flow to fund it — redirected directly from what you used to send to the IRS.

This is Stack Play #2. And for S-Corp owners, these two plays function as a system.

This play is designed for:

• High earners ($150K+) who are already maxing their 401(k) employee contributions and have additional cash flow available to invest

• Professionals phased out of direct Roth IRA contributions — in 2026, that means single filers earning roughly $150,000+ and married filers earning $236,000+ (the IRS adjusts this annually)

• Self-employed professionals and S-Corp owners with solo 401(k) plans who want to maximize tax-free retirement assets — especially those who implemented the S-Corp strategy from Stack Play #1 and are now sitting on meaningful annual SE tax savings

• Long-horizon investors who understand that tax-free compounding over decades is one of the most powerful forces in wealth building

You’re not struggling to save. The challenge is where the savings go — and whether the tax treatment on that capital will preserve or erode your wealth over time.

Here’s the problem that’s costing you: at $250,000 in household income, your investment portfolio is almost certainly split between:

1. Tax-deferred accounts (pre-tax 401(k), traditional IRA) — money you’ll pay ordinary income tax on when you withdraw it in retirement

2. Taxable brokerage accounts — where dividends are taxed annually, and capital gains are taxed when you sell

Notice what’s missing: a meaningful tax-free bucket. Without one, you enter retirement with limited flexibility — every dollar you spend comes with a tax bill attached.

Here’s what fixes that…