This standalone preview assumes a joint return with one working spouse, both spouses under 65 and not blind, no dependents or other income, and ordinary sole-proprietor income. W-2 wages belong to the same person as the business income and are assumed fully subject to income, Social Security and Medicare tax before the annual caps. No pretax payroll deductions are modeled.
Business expenses reduce both cash and taxable profit here, so enter only costs that meet both conditions. No deduction is automatically added for mileage, a home office, health insurance, an HSA, retirement or qualified business income (QBI).
Federal income tax uses the 2026 married-filing-jointly brackets, a $32,200 standard deduction and half of ordinary self-employment tax. Social Security shares a $184,500 annual cap across this person’s W-2 wages and 92.35% of business profit. Medicare is uncapped; Additional Medicare applies at 0.9% above $250,000 of combined Medicare wages and self-employment earnings. Ordinary SE tax starts when adjusted self-employment earnings reach $400.
The baseline excludes tax credits, QBI, itemized and other deductions, alternative minimum tax, state and local taxes, retirement, benefits and S-Corp treatment. Withholding, prior payments and safe-harbor rules are not modeled. Dollar displays are rounded; the calculation uses unrounded amounts. Use your full circumstances with a qualified tax professional for a filing or payment decision.
Rules checked October 13, 2026.