Your employers each withhold like they're your only job. They're not. MultiW2 shows you the gap, tells you how to close it, and models every decision before you make it.
Your jobs, snapshots, W2s, and scenarios all feed the same tax engine. Every number updates when you do.
Your jobs
3 jobs · 7 slots remaining
Tech Corp
$125,000
Biweekly
YTD Gross
$62,500
Fed W/H
$9,540
SS W/H
$3,875
Med W/H
$906
Consulting LLC
$95,000
Biweekly
YTD Gross
$47,500
Fed W/H
$6,180
SS W/H
$2,945
Med W/H
$689
Startup Inc
$78,000
Semimonthly
YTD Gross
$39,000
Fed W/H
$4,310
SS W/H
$2,418
Med W/H
$566
Workflows
Tax Calculator
Last calculated today
$68,352 federal tax · 22.9% effective
Liability Estimator
Projections current
$28,293 underpaid · W-4 adjustments needed
Tax Scenario Modeler
2 scenarios saved
Quit Startup Inc → save $25,913/yr
Benefits Optimizer
3 plans tracked
$13,640 total employer match
Tax Prep Kit
4 of 9 docs collected
Safe harbor: not yet met
OE Job Scanner
3 scans this month
Latest: 82/100 compatibility
See your real federal tax — across all your W2s
Enter your jobs, get your combined federal tax liability in seconds. The tax engine handles what single-job calculators get wrong: progressive brackets across combined income, proper standard deduction, and the withholding gap each employer can't see.
Effective
22.9%
Marginal
35%
Your 3 employers withheld $40,059 — but you actually owe $68,352
Know your withholding gap before April does
Enter the YTD numbers from your pay stub whenever it lands. MultiW2 projects your year-end liability from your actual data, not a formula, and tells you exactly how much extra to withhold on each employer’s W-4.
W-4 adjustments needed
Model the tax impact before you make the move
What happens to your taxes if you quit a job? Add a side gig? Change your filing status? Run what-if scenarios against your current baseline and compare the dollar impact — before you decide.
| Metric | Baseline | Scenario | Delta |
|---|---|---|---|
| Federal tax | $68,352 | $42,439 | -$25,913 |
| SS recovery | $7,037 | $2,201 | -$4,836 |
| Medicare gap | $882 | $180 | -$702 |
Capture every dollar of employer match
Three 401(k) plans. Three different match formulas. One IRS limit. The Benefits Optimizer shows you the allocation that captures every dollar of employer match across all plans and flags over-contributions before they trigger penalties.
Tech Corp
100% match up to 6%
Consulting LLC
50% match up to 8%
Startup Inc
3% non-elective
Max Tech Corp first (highest match rate), then Consulting LLC
Walk into filing season with every document ready
A checklist of every document you need at filing — W2s from each employer, contribution statements, quarterly payment receipts. Track what you have, see what's missing, and get a filing strategy based on your full-year data.
Score any job posting for multi-W2 fit
Paste a job posting and get a compatibility score across 6 dimensions. Tax Impact and W-4 Complexity are calculated by the actual tax engine using your current jobs — not AI guesswork.
Senior Backend Engineer — Acme Corp
82/100Adding this $140K role would push combined income to $438K (37% bracket)
Every tool runs on the same tax engine with 2026 IRS rates. Free users get exact W2 calculations and approximate projections. Pro unlocks everything.