{"slug":"us-self-employment-quarterly-taxes","name":"Self-Employment Tax & Quarterly Estimated Payments (2026 1040-ES)","category":"business","tags":["tax","income","planning"],"region":"US","tagline":"How much you’ll owe on 2026 freelance income — SE tax, income tax, QBI — and the exact quarterly payment the safe-harbor rules actually require.","endpoint":"https://xearno.tools/api/v1/tools/us-self-employment-quarterly-taxes","page":"https://xearno.tools/t/us-self-employment-quarterly-taxes","description":"The first-year freelancer’s tax planner. Computes your 2026 self-employment tax (both halves of Social Security and Medicare — including how W-2 wages eat the $184,500 wage base first), federal income tax with the QBI deduction, and then the number that matters: the quarterly estimated payment §6654 actually requires. That number usually does NOT depend on what you earn this year — the safe harbor is 100% of last year’s tax (110% if prior AGI topped $150k), and if you owed $0 last year, no estimated payments are required at all. General AI reliably misses these mechanics and quotes stale parameters; this uses the 2026 Form 1040-ES figures directly.","inputSchema":{"type":"object","properties":{"seProfit":{"description":"Expected 2026 self-employment profit Profit, not revenue — revenue minus business expenses. Entering gross revenue here is the most common way freelancers over-pay.","type":"number","minimum":0,"maximum":5000000,"default":60000},"w2Wages":{"description":"W-2 wages this year (if side-gigging) Your day-job wages matter twice: they eat the Social Security wage cap first (shrinking your SE tax), and their withholding counts toward the safe harbor.","type":"number","minimum":0,"maximum":5000000,"default":0},"w2Withholding":{"description":"Federal income tax withheld at the W-2 job (annual) From your pay stubs — federal income tax only. Withholding is treated as paid evenly across the year, which matters for the safe harbor.","type":"number","minimum":0,"maximum":1000000,"default":0},"filing":{"description":"Filing status","type":"string","enum":["single","hoh","mfj"],"default":"single"},"priorYearTax":{"description":"Total tax on your 2025 return The \"total tax\" line (line 22-ish) on your 2025 Form 1040. This is the safe-harbor anchor: pay 100% of it (110% if prior AGI > $150k) and you cannot be penalized regardless of what you earn this year — THE thing first-year freelancers don’t know. If you owed $0 in 2025, enter 0.","type":"number","minimum":0,"maximum":5000000,"default":0},"priorAgiOver150k":{"description":"Was your 2025 AGI over $150,000? Over $150,000 ($75,000 married filing separately), the prior-year safe harbor rises from 100% to 110% of last year’s tax.","type":"string","enum":["no","yes"],"default":"no"}},"required":[],"additionalProperties":false},"methodology":["Self-employment tax (2026): net earnings from self-employment = 92.35% of profit; no SE tax if profit is under $400. Medicare is 2.9% on the full net earnings. Social Security is 12.4% on net earnings up to the room left under the $184,500 wage base after W-2 wages — wages consume the cap first, so a well-paid day job shrinks or eliminates the Social Security portion of SE tax. Half of the SE tax is an above-the-line deduction.","Federal income tax (tax year 2026, per the Form 1040-ES rev. Feb 2026 worksheets): standard deduction $16,100 single / $24,150 head of household / $32,200 married filing jointly; seven brackets from 10% to 37%. Taxable income = profit − half SE tax + W-2 wages − standard deduction − QBI deduction.","QBI deduction: 20% × the lesser of qualified business income (profit − half SE tax) and taxable income before the deduction — the simplified below-threshold case, plus the new-for-2026 $400 minimum deduction when QBI is at least $1,000. The SSTB and W-2-wage/UBIA limitations that phase in above roughly $200k+ taxable income (higher for joint filers) are NOT modeled — above those thresholds the real deduction can be smaller.","Required annual payment (§6654): the lesser of 90% of this year’s tax and 100% of last year’s total tax (110% if prior-year AGI exceeded $150,000, or $75,000 married filing separately). If you had no tax liability last year — and 2025 was a full 12-month year and you were a US citizen or resident — no estimated payments are required at all. Separately, no penalty applies if the balance due after withholding is under $1,000. Each quarterly installment = (required annual payment − withholding) ÷ 4, because withholding is deemed paid evenly across the year (§6654(g)) — which is also why a late-year W-4 increase retroactively cures early installments while a late estimated payment does not.","2026 due dates: April 15, June 15, September 15, 2026, and January 15, 2027 (all business days). The January installment is waived if you file the 2026 return and pay in full by February 1, 2027.","Skip-quarterlies penalty: an estimate of the Form 2210 computation, not the exact figure — each installment’s shortfall accrues at that quarter’s IRS underpayment rate (Q2 2026: 6%, Q3 2026: 7%; later quarters not yet announced, 7% used as an estimate) from its due date to April 15, 2027: penalty ≈ Σ shortfall × rate × days ÷ 365. The real computation compounds by quarter and stops accrual on the actual payment date.","Not modeled: state and local estimated taxes, the 0.9% additional Medicare surtax (wages + SE income over $200k/$250k), the net investment income tax, itemized deductions, tax credits, SE health-insurance and retirement-plan deductions, or spouse income beyond the single W-2 wages field. A planning model, not tax advice."],"usage":"POST https://xearno.tools/api/v1/tools/us-self-employment-quarterly-taxes with a JSON body matching inputSchema."}