Retirement Plan Strategies for High Earners

Retirement plan contributions are often the single biggest tax savings lever for high earners. This guide maps out all available options across your full income picture.

Layer your accounts strategically. Start with the employer 401(k) up to the employee limit ($23,500 for 2025, plus catch-up if eligible). Then evaluate the mega backdoor Roth: if your plan allows after-tax contributions with in-plan Roth conversion, you can move up to an additional $46,500 into Roth status annually. This is the single largest legal tax shelter available to W-2 employees.

Side income unlocks additional plans. A SEP-IRA allows contributions up to 25% of net self-employment income. A Solo 401(k) offers both employee and employer contribution slots. For high earners with consistent side income, a defined-benefit plan can shelter $200,000 or more per year, though it requires actuarial administration and multi-year commitment.

Roth conversion ladders fill the gaps. If you anticipate lower-income years -- between jobs, a sabbatical, early retirement before Social Security begins -- converting traditional IRA balances during those years locks in a lower tax rate on that money permanently.

A CPA coordinates the moving parts. Contribution limits interact across plans (the employee deferral limit is shared across all 401(k) plans), and excess contributions trigger penalties. The wrong combination costs money instead of saving it.

The tradeoff: Maximum retirement plan utilization ties up money until at least age 59-1/2 (with limited exceptions). You are trading liquidity now for tax savings and compounding later.