Proactive Income Tax Strategies Series — Post 26.41
For the self-employed, retirement contributions serve two purposes at once: they build future savings, and they reduce this year’s taxable income directly. Few tax strategies accomplish both, and this one requires no complicated planning or gray-area interpretation.
Three main options, each with different rules
If you’re self-employed with no employees other than a spouse, you generally choose among three vehicles, each carrying different contribution limits and rules.
SEP-IRA. Employer-only contributions, up to 25% of compensation, capped at $72,000 for 2026. Simple to establish, with no annual filing requirement — though no age-based catch-up applies, since the IRS calculates contributions purely as a percentage of pay.
Solo 401(k). The most flexible structure for many owners, since you contribute as both employee and employer. For 2026, that’s up to $24,500 as employee, plus an employer contribution up to 25% of compensation, with total contributions capped at $72,000. Ages 50–59 add an $8,000 catch-up; ages 60–63 receive a larger $11,250 “super catch-up,” bringing the ceiling to $83,250 for that age band.
SIMPLE IRA. Built for smaller setups, with a 2026 employee contribution limit of $17,000, plus a $4,000 catch-up at age 50+ (or $5,250 for ages 60–63). A lower ceiling than the other two, but simpler to administer once employees enter the picture.
Callout — 2026 Contributions Limits at a Glance:
| Account Under 50 | Age 50–59 | Age 60–63 | |
|---|---|---|---|
| SEP-IRA | Up to $72,000 | Up to $72,000 | Up to $72,000 |
| Solo 401(k) | Up to $72,000 | Up to $80,000 | Up to $83,250 |
| SIMPLE IRA | $17,000 | $21,000 | $22,250 |
The part people miss: some deadlines extend well past year-end
Here’s what surprises most self-employed filers. SEP-IRA and Solo 401(k) employer contributions can typically be made all the way up to your filing deadline, including extensions — meaning a SEP-IRA can often still be opened and funded for the prior year long after December 31st has already passed. That gives you a genuine planning window if a stronger-than-expected year only becomes clear late, or even after the calendar year closes.
Solo 401(k) employee deferrals are the one exception worth flagging clearly: those generally require an election by year-end, even when the actual contribution amount is funded later. If a Solo 401(k) is on your radar, that election date is the single deadline on this list that doesn’t bend.
Why your business structure changes the calculation
The right account often depends on more than the contribution ceiling alone. A Solo 401(k) generally allows a lower-income self-employed person to contribute more than a SEP-IRA would, since the employee-contribution piece isn’t tied to the 25%-of-compensation formula. Add even one part-time employee, though, and the calculation shifts: a Solo 401(k) may no longer remain available, and a SEP or SIMPLE structure may require covering that employee too, at the same percentage you’re taking for yourself.
| Checklist — Choosing the Right Account |
|---|
| Estimate your net self-employment income before settling on a target contribution amount. Check for employees. Any eligible employees change which structures work and what you’re required to contribute on their behalf. Confirm your deadline. Solo 401(k) employee deferral elections are due by year-end; employer-side contributions for both SEP-IRA and Solo 401(k) often carry more room, extending up to your filing deadline. Factor in age-based catch-ups if you’re 50 or older — the gap between account types widens meaningfully once catch-ups apply. |
Retirement contributions require no waiting on legislation and no complicated interpretation — just the math, done before the deadline that actually applies to your account type passes. The dollars you contribute reduce this year’s taxable income now, and they remain yours for later.
| Not sure which account fits your income, age, and business structure? Schedule a retirement contribution strategy review, and we’ll model the numbers together before your applicable deadline arrives. |
Next in the series: there’s an account in the tax code that’s never taxed — not going in, not growing, and not coming out. Here’s how the HSA’s triple tax advantage actually works.