W-2 + 1099 Mixed Income Tax Calculator
Most freelancer tax calculators assume you only have 1099 income. If you have a W-2 day job AND freelance / side gig income, the math is trickier — the Social Security wage base interaction, Additional Medicare Tax, and W-2 withholding credit all change your real quarterly payment. Built on 2026 IRS figures.
Your situation
From your W-2 box 1, or projected for the year.
From W-2 box 2, or YTD federal tax line on a recent paystub × 12 / months elapsed.
Total revenue from 1099 work, before business expenses.
Schedule C deductible expenses (home office, software, mileage, etc.).
Your estimate
Quarterly 1040-ES payment (after W-2 withholding)
$4,309
Send this 4× per year on April 15, June 15, Sep 15, Jan 15.
Total annual tax owed
$26,237
W-2 withholding credit
−$9,000
Remaining tax owed
$17,237
Effective rate (combined gross)
23.4%
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Why mixed income is different
When you have both a W-2 and 1099 income, four things change vs a pure-1099 calculator:
- SS wage base interaction — the 12.4% Social Security portion of self-employment tax only applies up to the 2026 wage base ($182,400). Your W-2 wages already used part of that cap, so SE tax SS only applies to the remaining headroom (or zero, if your W-2 wages alone exceed it).
- Combined progressive brackets — your taxable income is W-2 wages + net SE earnings combined. That can push you into a higher federal bracket than either source alone would.
- W-2 withholding credit — your employer already paid federal income tax via withholding on every paycheck. That counts toward your total tax owed, so your quarterly 1040-ES amount is (total tax minus W-2 withholding) ÷ 4, not (total tax) ÷ 4.
- Additional Medicare Tax — 0.9% on combined wages + SE earnings above $200k (single) / $250k (MFJ). Most calculators skip this. If your combined income is high, it's another $1k-$3k+ in tax.
Things this calculator does NOT account for
- Filing status beyond single / MFJ — head of household and married filing separately have their own brackets and standard deductions.
- QBI deduction — the 20% qualified business income deduction can knock 4-6% off your tax bill if you qualify. Not modeled here.
- Retirement contributions — Solo 401(k) and SEP-IRA contributions reduce your SE income (and taxable income) substantially. Subtract them from net SE income for an adjusted estimate.
- Itemized deductions — uses the standard deduction. If you itemize, override mentally.
- State withholding from W-2 — many W-2 paychecks already withhold state tax. The state line here applies the rate to your combined gross; if you know your actual state withholding, treat that as a credit against the state line.
The W-2 box 13 retirement plan trap
One thing this calculator can't see: if your W-2 box 13 ("Retirement plan") is checked, your traditional IRA deduction phases out at $79k-$89k MAGI single / $126k-$146k MFJ (when one spouse is covered) for 2026. Even if you contribute $0 to the workplace plan, eligibility alone triggers it. If that hits you, a Solo 401(k) on your 1099 / LLC side typically unlocks much more tax-advantaged room than the IRA you're losing — see our self-employment tax guide for the math.