Itemized calculation of 12.4% Social Security, 2.9% Medicare, and Schedule 1 above-the-line deductions.
| Tax Line / Schedule Item | Basis & Rate | Amount |
|---|---|---|
| Net 1099 Profit (Schedule C Line 31) | Gross Revenue minus Expenses | $0.00 |
| Taxable SE Base (92.35% Multiplier) | Net Profit × 0.9235 | $0.00 |
| Social Security Tax (12.4%) | 12.4% up to statutory cap | -$0.00 |
| Medicare Tax (2.9% + 0.9% Surtax) | 2.9% on all earnings | -$0.00 |
| Total Self-Employment Tax | Social Security + Medicare (Schedule SE) | -$0.00 |
| 50% Above-the-Line Deduction | Schedule 1 Line 15 (Reduces AGI) | -$0.00 |
| 20% QBI Deduction (Section 199A) | Eligible pass-through business write-off | -$0.00 |
| Federal Income Tax Liability | Marginal progressive brackets | -$0.00 |
| Total Combined Tax Liability (SE + Income Tax) | -$0.00 | |
| Estimated Net Take-Home (100.0% Kept) | +$0.00 | |
To avoid IRS underpayment penalties, remit $0.00 by each statutory deadline:
If you operate as an independent contractor, freelancer, sole proprietor, or single-member LLC with net earnings of $400 or more, the IRS requires you to pay Self-Employment (SE) tax. Unlike W-2 employees where the employer pays half of FICA taxes, self-employed individuals pay both employer and employee portions, totaling 15.3%:
The IRS doesn’t calculate SE tax on 100% of your Schedule C net income. Instead, you multiply your net profit by 92.35% (0.9235) before applying the 15.3% tax rate. This simulates the tax deduction W-2 employers receive when paying their share of payroll taxes.
Deduct half your SE tax on Schedule 1 Line 15 to lower your Adjusted Gross Income (AGI).
Deduct up to 20% of your qualified business income from federal income taxation.
Explore Related 1099 Contractor Tools & Statutory Guides
Official CPA explanations for the 15.3% SE tax rate, 92.35% net earnings base, 50% Schedule 1 deduction, 20% QBI deduction, and quarterly estimated tax payments.