1099 Tax Write-Offs Calculator
Total every 2026 1099 write-off — mileage, home office, phone, supplies, health premiums, retirement — and see the tax each one saves.
Contractors who never total their write-offs typically overpay by thousands, because a 1099 deduction cuts income tax and self-employment tax at the same time.
Your deductions
Stack every 1099 write-off — Schedule C plus above-the-line adjustments.
Total deductions
$15,450
Estimated tax saved
$4,819
Effective savings
31.2%
Deduction breakdown
Mileage (12,000 × $0.7)$8,400
Home office (simplified)$600
Schedule C total$10,050
Above-the-line (health + retirement)$5,400
SE tax reduction (14.13%)$1,420
Income tax reduction$3,399
Total tax saved$4,819
Schedule C deductions reduce both income tax and 15.3% SE tax. Above-the-line deductions cut income tax and AGI-based phaseouts. Estimates only — not tax advice.
Frequently asked questions
- What are the most common 1099 tax write-offs?
- Business mileage at $0.70 per mile for 2026, a home office, the business share of phone and internet, supplies and equipment, software subscriptions, platform and payment fees, professional services, business insurance, and — as Schedule 1 adjustments — self-employed health premiums and retirement contributions.
- How much does a 1099 write-off save me?
- Each deductible dollar removes your marginal income tax rate plus roughly 14.1% effective self-employment tax, plus state tax. In the 22% bracket that is about 36 cents saved per dollar before state tax.
- Can I claim write-offs without receipts?
- Mileage needs a contemporaneous log rather than receipts, but everything else needs a receipt, invoice, or bank record showing amount, date, and business purpose. Keep them for three years after filing.
- Do write-offs reduce self-employment tax too?
- Schedule C business expenses do, because self-employment tax is calculated on net profit. Health premiums and retirement contributions do not — they cut income tax only.
- Can I write off expenses if I had a loss?
- Yes. A genuine Schedule C loss offsets other income, including W-2 wages. Repeated losses with no path to profit can invite hobby-loss questions, so keep the business intent documented.
- Do I still get write-offs if I take the standard deduction?
- Yes. Business write-offs live on Schedule C, entirely separate from the standard deduction, so you claim both.
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