A SEP IRA (Simplified Employee Pension) is an IRA-based plan many sole proprietors, freelancers, and side-hustle filers use to shelter self-employment profit. You open it at a brokerage such as Fidelity, Schwab, Vanguard, or E*TRADE, contribute for yourself as the “employer,” and invest inside the account like a traditional IRA. Limits are much higher than a regular IRA for profitable years—and they scale with net self-employment income, not gross 1099 receipts.
Side income often arrives on Form 1099-NEC; how that differs from wages: W-2 vs 1099 tax basics. Self-employment tax still applies on net earnings: Self-employment tax basics.
Who a SEP fits (and who it does not)
| Fit | Usually yes | Usually look elsewhere |
|---|---|---|
| Solo freelancer / single-member LLC with profit | Simple paperwork, high ceiling | — |
| Side hustle on top of a W-2 job | SEP can cover the self-employment slice | Do not confuse with your W-2 401(k) limit rules |
| Hiring employees | SEP must cover eligible employees too | Solo 401(k) basics or other plans may fit better once payroll exists |
| Roth preference | SEP contributions are traditional-style | Pair with a Roth IRA / 401(k) starter for Roth space |
A SEP does not erase quarterly estimated tax habits. Profit still feeds SE tax and income tax planning: Quarterly estimated taxes.
Contribution limit cues (not a calculator)
IRS rules change by year. In plain terms for a sole prop:
- Start from net profit from the business (Schedule C-style), after expenses.
- Reduce for the deductible portion of self-employment tax (the usual SE-tax adjustment).
- Apply the SEP percentage limit (commonly up to 25% of that adjusted compensation figure for sole props, subject to an annual dollar cap published by the IRS).
- You generally cannot contribute more than that year’s IRS maximum for SEP employer contributions.
W-2 wages from a day job do not inflate your SEP limit for a separate side business. The SEP cares about the self-employment compensation the plan covers. Traditional IRA deduction phaseouts are a different lane: Traditional IRA deduction phaseouts.
Worked example
Casey has a $72,000 W-2 job and a design side hustle. Gross 1099-NEC receipts: $28,000. Software, contractors, and supplies: $6,000. Approximate Schedule C profit: $22,000. After the usual SE-tax deduction adjustment, SEP-eligible compensation might land near the low-$20,000s. At a 25% employer rate, Casey’s SEP room for that business might be roughly $5,000 (illustrative—run IRS worksheets or tax software for the year).
Casey also maxes a Roth IRA from earned income and keeps 401(k) deferrals at work. The SEP does not replace emergency cash for irregular freelance months (Side hustle money basics).
Deadlines and paperwork
- Establish / contribute timing — SEP contributions for a tax year are often allowed up to the business’s tax filing deadline including extensions. Confirm the year’s IRS rule when you fund. Deadline vs 401(k) deferral calendars: SEP IRA contribution deadline basics.
- Form 5305-SEP or prototype — Many brokerages use a prototype document; keep the adoption paperwork with your tax file.
- Employees — If you add eligible staff, SEP contribution formulas usually must cover them at the same percentage—budget before you hire.
Funding a SEP is not the same as sending quarterly estimates to the IRS. Keep both calendars.
Checklist
- Confirm you have net self-employment profit, not just gross deposits.
- Open a SEP IRA titled correctly for your sole prop or entity at a low-cost brokerage.
- Use IRS limit worksheets or tax software—do not copy a blog percentage onto gross revenue.
- Coordinate with any workplace 401(k) and IRA goals so cash flow stays sane.
- Document the contribution date and tax year in your bookkeeping.
- Revisit the plan if you hire employees or incorporate.
*Educational only. Not tax, legal, or investment advice.Employers who want employee deferrals plus a required match often compare a SIMPLE IRA instead of SEP-only funding.
Educational only. Not tax, legal, or investment advice. Contribution limits and deadlines change by tax year—verify with IRS publications or a qualified tax professional.