Retirement Calculator for Self-Employed (SEP IRA)

As a financial advisor who has spent over a decade working with self-employed clients, I see the same mistake year after year: freelancers, consultants, and small business owners focus so intensely on growing revenue that they neglect the one account that could save them thousands in taxes and fund a comfortable retirement. The SEP IRA is one of the most powerful retirement vehicles available to the self-employed, yet many don't fully understand how much they can contribute—or how to calculate it.

If you're self-employed and trying to map out your retirement trajectory, this guide walks through the SEP IRA rules, the contribution math, a head-to-head comparison with Solo 401(k) and SIMPLE IRA, and concrete projections you can model with our Retirement Calculator.

What Is a SEP IRA?

A SEP IRA—short for Simplified Employee Pension Individual Retirement Arrangement—is a retirement plan designed for self-employed individuals, freelancers, and small business owners. It functions similarly to a traditional IRA but allows dramatically higher contribution limits, making it attractive for high earners who want to defer significant income.

For the 2026 tax year, the SEP IRA contribution limit is the lesser of $69,000 or 25% of compensation. However, there is an important nuance for sole proprietors: because the calculation is based on net self-employment income after deducting half of your self-employment tax, the effective contribution rate works out to roughly 20% of your net Schedule C income.

Contributions are fully tax-deductible, reducing both your income tax and adjusting your qualified business income (QBI) deduction. The funds grow tax-deferred until withdrawal, at which point distributions are taxed as ordinary income. Withdrawals before age 59½ generally trigger a 10% early withdrawal penalty, though several exceptions exist.

How to Calculate Your SEP IRA Contribution

The most common confusion I encounter is how sole proprietors actually arrive at their contribution number. Let me walk through a concrete example:

• Net Schedule C income: $100,000
• Self-employment tax deduction (half of SE tax): $7,065
• Adjusted net income: $92,935
• Contribution rate (sole proprietor): 20%
• Maximum SEP IRA contribution: $92,935 × 0.20 = $18,587

This is the figure you'd enter into a Retirement Calculator to project long-term growth. Keep in mind that the 25% statutory rate applies to the adjusted income figure, not your raw Schedule C income—this is why the effective rate lands near 20% for sole proprietors.

If you need to estimate your self-employment tax before running this calculation, our Self-Employment Tax Calculator handles the math for both the employer and employee portions.

SEP IRA vs. Solo 401(k) vs. SIMPLE IRA

Choosing the right plan depends on your income level, whether you have employees, and how much administrative complexity you're willing to tolerate. Here's how the three most popular self-employed plans compare:

Which Plan Is Best for You?

• Solo freelancer earning under $100K: A Solo 401(k) usually wins. Because you can stack the $23,000 employee deferral on top of the employer portion, you can contribute far more at a lower income level than a SEP IRA allows.
• High-earning solo ($300K+): A SEP IRA is often the better choice. Once you've maxed out either plan, the administrative simplicity of the SEP IRA—no Form 5500-EZ, no separate plan document—becomes attractive.
• Small business with employees: A SIMPLE IRA or traditional 401(k) is typically better. SEP IRAs require you to contribute the same percentage of compensation for every eligible employee, which can get expensive quickly. Model employer costs with our 401(k) Calculator before committing.

Tax Savings Example

The immediate appeal of a SEP IRA is the tax break. Let's say you make a $50,000 SEP contribution and fall into the 24% marginal federal bracket. You'd save $12,000 in federal income tax for the current year, plus any state income tax savings.

There's also an interaction with the Qualified Business Income (QBI) deduction worth noting: SEP contributions reduce your qualified business income, which in turn reduces your QBI deduction. For some high earners this can soften the tax benefit slightly, but the net savings remain substantial. To see exactly how this plays out across your whole return, pair our Income Tax Calculator with your SEP projection.

Future Value Projections

Assuming a conservative 7% average annual return (in line with long-term historical stock market performance), here's what consistent SEP IRA contributions can build:

• $20K/year for 25 years (age 40–65): ~$1.32 million
• $40K/year for 25 years (age 40–65): ~$2.63 million
• $50K/year for 20 years (age 45–65): ~$2.05 million

These figures assume steady contributions and reinvested growth. You can model your own scenario—adjusting for inflation, return rate, and contribution ramp-up—using our Compound Interest Calculator.

SEP IRA Rules and Considerations

Before you commit to a SEP IRA, understand the rules that govern it:

• Establishment deadline: You must set up the SEP IRA by your tax filing deadline, including extensions. This makes it one of the few retirement accounts you can still fund after the calendar year ends.
• Immediate vesting: All contributions vest immediately—there's no gradual vesting schedule.
• Required Minimum Distributions (RMDs): Under SECURE Act 2.0, RMDs begin at age 73.
• Early withdrawal penalty: Distributions before 59½ trigger a 10% penalty, with exceptions for first-home purchase, qualified education expenses, and certain medical costs.
• No loans: Unlike a 401(k), you cannot borrow from a SEP IRA.

Employee Considerations

This is the single most overlooked rule: if you have eligible employees, you must contribute the same percentage of compensation for them as you do for yourself. An employee is generally eligible if they:

• Are at least 21 years old,
• Have worked for you in 3 of the last 5 years, and
• Earned at least $750 in compensation (2026 threshold).

For a solo consultant with no employees, this is a non-issue. But for a small business owner with five employees each earning $60K, a 20% SEP contribution for yourself means a 20% contribution for everyone—$12,000 per employee, or $60,000 in additional required contributions. This is why the SEP IRA is best suited to true solos or businesses with very few eligible employees.

Bottom Line

The SEP IRA is one of the most efficient retirement and tax-deferral tools available to the self-employed. It offers high contribution limits, minimal administrative burden, and an immediate tax break that can be worth five figures annually for high earners. The trade-offs—no employee deferrals, no Roth option, and mandatory equal contributions for employees—mean it isn't the right fit for every situation, particularly solo earners under $100K or businesses with multiple employees.

Run the numbers for your specific situation using the tools below, and consult a tax professional before finalizing your contribution strategy for the year.

Next Steps

• Project your retirement balance with our Retirement Calculator.
• Compare employer plans using the 401(k) Calculator.
• Estimate your self-employment tax with the Self-Employment Tax Calculator.
• Calculate taxes on 1099 income with our 1099 Tax Calculator.
• See your full income tax picture with the Income Tax Calculator.
• Model long-term growth using the Compound Interest Calculator.

Sources

• IRS Publication 560 — Retirement Plans for Small Business (SEP, SIMPLE, and Qualified Plans)
• IRS Publication 590-A — Contributions to Individual Retirement Arrangements
• Fidelity — SEP IRA for Self-Employed and Small Business Owners
• Vanguard — SEP IRA Plan Overview
• U.S. Department of Labor — Retirement Plans for Small Business
• SECURE Act 2.0 (Consolidated Appropriations Act, 2023)