1099 Quarterly Tax Calculator — Free 2026

Know exactly what to pay each quarter. Includes self-employment tax (15.3%), QBI deduction (20%), and 2026 IRS due dates.

Annual Gross 1099 Income ($)

Business Expenses ($)

Other Income (W2, interest, etc.) ($)

Filing Status

State Tax Rate (%)

How Quarterly Taxes Work

Self-Employment Tax

15.3% on 92.35% of net SE income. Covers Social Security and Medicare. You pay both employer and employee shares.

Deductions

Deduct half of SE tax from AGI. Also eligible for 20% QBI deduction if net income is below thresholds.

Underpayment Penalty

Owe less than $1,000 at filing? No penalty. Owe more? Pay 90% of current year tax quarterly or 100% of prior year tax to avoid penalty.