SIMPLE IRA for Sole Proprietors: Eligibility, Limits, and Deadlines

A sole proprietor can open a SIMPLE IRA for the 2026 tax year and defer up to $17,000 of net self-employment earnings as the employee, then add an employer match or a flat 2% non-elective contribution on top. Because you file Schedule C, you count as both employer and employee, so you fund both sides of the plan yourself.¹ The paperwork is lighter than a solo 401(k), and both contributions come off your income on Schedule 1.

Who Qualifies

Your business qualifies if it had 100 or fewer employees who each earned at least $5,000 in the prior calendar year. Full-time, part-time, seasonal, and leased workers all count toward that number.² A solo operator clears that threshold without a second thought.

There is one restriction that catches people. You cannot maintain another qualified retirement plan for the same calendar year the SIMPLE IRA is in effect. No SEP IRA, no solo 401(k), no defined-benefit plan running alongside. Narrow exceptions exist for acquisitions and for businesses with union employees under a separate bargaining agreement, but they rarely apply to a typical sole proprietor.³ If you already have a SEP, you have to close that door before opening this one.

Setting Up the Plan

You establish a SIMPLE IRA using one of two IRS model documents. Form 5304-SIMPLE lets each participant pick their own financial institution; Form 5305-SIMPLE designates a single institution for everyone. Either works for a solo plan.⁴

Timing matters. If you have never had a SIMPLE IRA, you can start one effective any date from January 1 through October 1 of the current year. If you had one in a prior year, the new plan year has to begin on January 1. Businesses formed after October 1 can set the plan up as soon as administratively feasible.³ You don’t file the forms with the IRS. Just keep them with your records.

How Much You Can Contribute

Every dollar goes in through one of two channels: your elective deferral as the employee, and a mandatory employer contribution. A sole proprietor writes both.

Elective Deferrals

For 2026, the standard deferral limit is $17,000, and your deferral cannot exceed your net earnings from self-employment for the year.⁵ The contribution is pretax and reduces taxable income dollar for dollar.

If you are 50 or older, you can add a $4,000 catch-up in 2026, bringing the deferral ceiling to $21,000. If you are 60 through 63 during the year, a “super catch-up” of $5,250 applies instead, for a maximum deferral of $22,250.⁶ The age-60-to-63 bump comes from SECURE 2.0 and can move real money for sole proprietors close to retirement.

Employer Contributions

On top of the deferral, you owe one of two employer contributions each year:

A dollar-for-dollar match on your own deferrals, up to 3% of net self-employment earnings.
A flat 2% of net self-employment earnings, whether or not you deferred anything that year. Compensation for this calculation is capped at $360,000 for 2026.⁵

The match has a built-in escape valve: you can drop the match to as low as 1% for up to two calendar years within any five-year window.⁴ With the 2% non-elective, you owe the contribution even if you defer nothing, which some sole proprietors find less appealing in a tight year.

What Counts as Compensation

Your compensation for SIMPLE IRA purposes is your net earnings from self-employment. That’s the number on line 4 of the Short Schedule SE or line 6 of the Long Schedule SE.¹ It starts with Schedule C net profit and steps down by the employer-equivalent half of self-employment tax. You do not subtract the SIMPLE IRA contribution itself, which is what makes the math easier than a SEP calculation.

Both sides of the contribution are deducted on Form 1040, Schedule 1, line 16 — the line labeled “Self-employed SEP, SIMPLE, and qualified plans.”⁷ Calculate your elective deferral first, then figure the employer piece on the earnings that remain.

Higher Limits for Small Employers

SECURE 2.0 created enhanced contribution ceilings for employers with 25 or fewer employees. That describes most sole proprietorships. Under those rules, the 2026 elective deferral limit rises to $18,100 instead of $17,000, the age-50 catch-up at eligible employers is $3,850, and the super catch-up for ages 60 through 63 stays at $5,250.⁸

An employer using the higher deferral ceiling must also step up the non-elective side, with an additional non-elective contribution allowance of up to $5,300.⁸ The added complexity is worth tracking because total annual savings can shift by more than a thousand dollars once catch-ups are layered in.

When Contributions Are Due

Elective deferrals must be deposited no later than 30 days after the end of the month in which the amounts would otherwise have been paid as wages.⁹ For a self-employed person whose “wages” are annual net earnings recognized by December 31, that generally means depositing the deferral by January 30 of the following year.

Employer contributions get a longer runway. The match or the 2% non-elective is due by the filing deadline for your federal income tax return, including extensions.¹⁰ For most sole proprietors, that is April 15, or October 15 with a timely six-month extension. Your custodian reports all contributions on Form 5498 each year.¹¹

Withdrawals and the Two-Year Rule

Money you take out of a SIMPLE IRA is taxed as ordinary income. If you are under 59½, an additional 10% early-distribution tax applies on top of the income tax.¹²

The trap unique to this account: if you withdraw within the first two years of participating in the plan, the 10% penalty jumps to 25%. The clock starts on the date your first contribution actually hits the account, not the date you signed paperwork.¹³ Open the account in March 2026, pull money out in February 2028, and you owe 25%. Wait until March 2028 and it drops to 10%. Wait until 59½ and there is no additional tax at all.

The two-year rule also limits transfers. During that initial window, a SIMPLE IRA can only be rolled into another SIMPLE IRA. Move it into a traditional IRA or a 401(k) inside two years and the IRS treats the transfer as a taxable distribution, with the 25% penalty if you are under 59½.¹² After two years, you can roll into a traditional IRA, a 401(k), or most other qualified plans without tax consequences.

Exceptions to the Early Withdrawal Tax

Several situations waive the additional tax (both the 10% and the 25% versions). The income tax still applies; only the penalty is set aside.¹³ The main ones sole proprietors run into:

Total and permanent disability, or death (beneficiary takes the funds without the additional tax).
Unreimbursed medical expenses above 7.5% of adjusted gross income.
Health insurance premiums paid after receiving unemployment compensation for at least 12 weeks.
Up to $10,000 for a first-time home purchase.
Qualified higher education expenses for you, a spouse, or dependents.
Up to $5,000 per child for a qualified birth or adoption.
Substantially equal periodic payments taken over your life expectancy under an IRS-approved method.
Amounts seized by IRS levy.
One emergency personal expense withdrawal per year, up to the lesser of $1,000 or your vested balance above $1,000.
Up to $22,000 for an economic loss from a federally declared disaster.

SIMPLE IRA or SEP IRA

The SEP IRA is the alternative most sole proprietors weigh against a SIMPLE. The structural difference is straightforward: a SEP is funded entirely by employer contributions, with no employee deferral.¹⁴ You can contribute up to 25% of net self-employment earnings, capped at $72,000 for 2026, and you can vary or skip the amount from year to year.

A SIMPLE IRA requires the mandatory employer piece every year, but you get elective deferrals in exchange. For someone earning enough to max out, the SEP’s $72,000 ceiling dwarfs the SIMPLE’s combined total. In the $60,000-to-$100,000 range, the math often tilts the other way. At $80,000 in net self-employment earnings, a SEP contribution maxes out around $20,000 (25% of adjusted earnings), while a SIMPLE could reach $17,000 in deferrals plus a 3% match of roughly $2,400. Comparable totals, with the SIMPLE forcing consistent savings through the deferral portion.

The SEP also has cleaner withdrawal mechanics: no two-year penalty window, no rollover restrictions, no 25% rate. If withdrawal flexibility matters to you, that is a real advantage. The SIMPLE’s edge is the ability to shelter income through deferrals rather than relying entirely on a percentage of earnings, which helps in the income range where 25% doesn’t produce a large enough number to hit your savings goal.

1
Internal Revenue Service. SIMPLE IRA Tips for the Sole Proprietor
2
Internal Revenue Service. SIMPLE IRA Plan Fix-It Guide – You Have More Than 100 Employees Who Earned 5000 or More in Compensation for the Prior Year
3
Internal Revenue Service. Retirement Plans FAQs Regarding SIMPLE IRA Plans
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Internal Revenue Service. Retirement Topics – SIMPLE IRA Contribution Limits
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Internal Revenue Service. 401(k) Limit Increases to 24500 for 2026, IRA Limit Increases to 7500
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Internal Revenue Service. Schedule 1 (Form 1040) – Additional Income and Adjustments to Income
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Internal Revenue Service. 2026 Amounts Relating to Retirement Plans and IRAs, as Adjusted
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Internal Revenue Service. SIMPLE IRA Plan Fix-It Guide – You Didnt Deposit Employee Elective Deferrals Timely
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Internal Revenue Service. Publication 560 – Retirement Plans for Small Business
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Internal Revenue Service. About Form 5498, IRA Contribution Information
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Internal Revenue Service. SIMPLE IRA Withdrawal and Transfer Rules
13
Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions
14
Internal Revenue Service. Simplified Employee Pension Plan