How to Calculate 1099 Taxes: A Step-by-Step Guide for 2026
Calculating 1099 taxes confuses new freelancers and gig workers because there are really three taxes layered on top of each other: self-employment tax (15.3%), federal income tax (progressive brackets), and state income tax. This guide walks the exact math the IRS uses on Schedule C and Schedule SE — with a real worked example.
Step 1: Add up gross 1099 income
Combine every payout from every 1099 source — Uber, DoorDash, Upwork, direct client payments — regardless of whether you received a 1099 form. Tips count. Bonuses count. The IRS knows whether you got a form is unrelated to whether the income is taxable.
Step 2: Subtract business expenses
Mileage (2026: $0.70/mi), phone, supplies, software, home office (simplified $5/sq ft up to 300 sq ft), and any other ordinary-and-necessary business cost. The result is your net self-employment income — the figure both SE tax and income tax flow from.
Step 3: Calculate self-employment (SE) tax
SE tax is the self-employed equivalent of FICA: 12.4% Social Security + 2.9% Medicare = 15.3%. The IRS first multiplies net SE income by 92.35% (the employer-share adjustment), then applies 15.3%. So:
Formula
SE tax = Net SE income × 0.9235 × 0.153
Deductible half
You then deduct 50% of the SE tax from AGI before computing income tax. The IRS lets you do this because employees don't pay income tax on the employer half of FICA.
Step 4: Calculate federal income tax
Take AGI (net SE + any W-2 wages − ½ SE tax − health insurance − retirement contributions), subtract the standard deduction ($16,100 single / $32,200 MFJ for 2026), and apply the 2026 federal brackets. Income tax is progressive, so each bracket is taxed separately.
Step 5: Add state income tax
Nine states have no income tax (FL, TX, WA, TN, NV, SD, AK, WY, NH). The rest range from ~3% (PA) to ~9.3% (CA). Apply your state's rate to taxable income for a reliable estimate.
Worked example
A Dasher in Texas with $40,000 gross, 18,000 business miles, $1,200 other expenses: mileage deduction = $12,060; net SE = $26,740; SE tax = $26,740 × 0.9235 × 0.153 = $3,779; ½ SE deduction = $1,890; AGI = $24,850; taxable = $10,250; federal income tax ≈ $1,083; state tax = $0. Total ≈ $4,862, or about 12% of gross.
Frequently asked questions
+How do I calculate 1099 taxes quickly?
Multiply net self-employment income (gross minus business expenses) by ~22–30% as a quick set-aside, then refine with a calculator that handles federal brackets and your state.
+Do I owe 15.3% on top of income tax?
Yes — self-employment tax is in addition to federal and state income tax, which is why 1099 workers owe far more than W-2 employees on the same gross income.
+Can I lower my 1099 tax bill?
The two biggest levers are tracking every business mile and contributing to a SEP-IRA or Solo 401(k), both of which reduce SE income and AGI.
About the author
Javed Niamat · Founder & Editor, GigTax
Javed Niamat founded GigTax to make self-employment tax math understandable for rideshare drivers, delivery couriers, creators and freelancers. He builds and maintains every calculator on this site and writes the guides that explain the numbers behind them.
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