The SE Tax Optimization Priority Stack
- Track and maximize ALL legitimate business deductions — every dollar reduces both SE and income tax
- Deduct 100% of self-employed health insurance premiums for yourself, spouse, and dependents
- Set up and maximize a Solo 401k (both employee and employer contributions)
- Contribute to an HSA if enrolled in a high-deductible health plan ($4,300 individual / $8,550 family limit in 2025)
- Evaluate S-corp election at $100,000+ sustained net SE income
- Consider a SEP-IRA as a simpler alternative if Solo 401k administration is not worthwhile
- Time income and expenses to minimize tax in peak earning years (defer income, accelerate deductions)
- Evaluate Defined Benefit Plan if income is very high and you’re within 10 years of retirement
SE tax optimizations and their impact at $100,000 net SE income
| Optimization | Reduces SE Tax? | Reduces Income Tax? | Annual Savings at $100K |
|---|---|---|---|
| Business deductions ($15K) | Yes | Yes | $5,500+ |
| Solo 401k employee ($23,500) | No | Yes | $5,170 |
| Solo 401k employer ($18,500) | Yes | Yes | $7,700 |
| Health insurance deduction ($8K) | Yes | Yes | $3,000 |
| Home office ($3,500) | Yes | Yes | $1,300 |
| S-corp (reasonable salary split) | Yes | Some | $8,000–$12,000 |
The Annual Tax Planning Checklist
Every December, run through this checklist: (1) Review year-to-date income and project year-end net SE income. (2) Maximize Solo 401k contributions before December 31 (or plan to make prior year contributions before tax deadline via SEP-IRA). (3) Make any planned equipment purchases before year-end to take the Section 179 deduction. (4) Review health insurance — if premiums increased, update your deduction records. (5) Assess whether income level warrants S-corp election for next year.
Most self-employment tax optimizations must be executed by December 31: Solo 401k establishment (contributions can wait until tax filing), income deferral, year-end equipment purchases for Section 179, and any charitable contributions. Calendar a December financial review every year.
Calculate Your Optimized SE Tax
Enter your income with and without planned deductions and retirement contributions to see your optimized tax liability.