Estimate self-employment tax, deductible half, and quarterly set-aside targets from expected net profit.
Inputs
Expected net profit (Schedule C)
Social Security wage base
Quarterly buffer % (optional)
Self-employment tax estimate
Breakdown
- Net earnings (92.35%)
- $78497.50
- Social Security (12.4%)
- $9733.69
- Medicare (2.9%)
- $2276.43
- Total SE tax
- $12010.12
- Effective rate on profit
- 14.13%
Planning targets
- Deductible half (Form 1040)
- $6005.06
- Quarterly minimum (SE tax only)
- $3002.53
- Quarterly with 15% buffer
- $3452.91
Reminders and common deductions
How this estimate works
Self-employment tax is calculated on 92.35% of profit, then split across Social Security and Medicare.
Common write-offs
Home office, mileage, software, insurance, business phone, and contractor expenses often reduce taxable profit.
Quarterly planning
Saving monthly can smooth cash flow so quarterly payments are less likely to create surprise bills.
When to confirm
Check current IRS limits and your full tax profile with a CPA or enrolled agent before filing estimates.
Estimates only, not tax advice. This tool does not include Additional Medicare Tax, income tax, state tax, or special elections.