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SEP-IRA: The Most Powerful Retirement Account for Self-Employed Founders

A SEP-IRA lets you put away up to $70,000 per year and deduct every dollar from your taxable income. Here's how it works, how to open one, and why most founders should start here.

📅 May 6, 20262 min read

What Is a SEP-IRA?

A Simplified Employee Pension IRA (SEP-IRA) is a retirement account for self-employed individuals and small business owners. It works like a traditional IRA but with much higher contribution limits.

For 2025:

  • **Maximum contribution:** 25% of net self-employment income, up to **$70,000**
  • **Tax-deductible:** Every dollar contributed reduces taxable income
  • **Tax-deferred growth:** No taxes until withdrawal in retirement
  • The Real Tax Math

    Business earns $80,000 net profit. SE tax ~$11,300. After deducting half ($5,650), net self-employment income ~$74,350.

    25% of $74,350 = **~$18,588 SEP-IRA contribution limit**

    In the 22% federal bracket: **$4,089 in taxes saved this year**, plus that money compounds tax-deferred for decades.

    How to Open One (Free)

    Available at every major brokerage at no cost:

  • **Fidelity** — No fees, excellent index fund selection, setup online in minutes
  • **Vanguard** — Industry-low expense ratios, strong for passive investors
  • **Charles Schwab** — No minimums, good customer service
  • Process: Go to the brokerage site → Open Account → SEP-IRA → enter your EIN and business info. Takes 15–20 minutes.

    Contribution Deadline

    Unlike 401(k)s, you can fund a SEP-IRA **up to your tax filing deadline, including extensions** — April 15, or October 15 with an extension.

    This means you can wait until you know your exact income, calculate the optimal contribution, and fund it before the deadline. You can even open the account in April for the prior tax year.

    SEP-IRA vs. SIMPLE IRA

    For solo founders:

  • **SEP-IRA wins on contribution limits** — up to $70k vs $16,500 for SIMPLE
  • **SEP-IRA is simpler** — no mandatory employer match, easier administration
  • **SIMPLE IRA** makes sense only if you have employees who also need to contribute
  • Solo operator? Use the SEP-IRA.

    The Bottom Line

    This is the most underused tax strategy for self-employed founders. You're going to retire someday — might as well do it in a way that costs the IRS money instead of you.

    Open a SEP-IRA. Contribute what you can. Reduce your tax bill today. Let compound growth work for decades. Setup is free and takes less than 30 minutes.

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