Employee worked 45 days in California? Calculating retroactive state tax liability just went from 3 hours of spreadsheet hell to 90 seconds. No joke.
Try The Calculator (FREE Beta) →Manually looking up tax rates, calculating brackets, checking reciprocity agreements, comparing credits... by the time you're done, half your day is gone.
They finish their assignment, return home, then BAM - HR tells them they owe $2,500 in taxes. Now they're upset, HR is apologizing, and nobody's happy.
One miscalculation = penalties, interest, angry employees, and your CPA side-eyeing you. The stakes are high and Excel isn't helping.
Does Illinois have reciprocity with Wisconsin? What about New York and New Jersey? Who has time to memorize 50 states worth of agreements?
Tax brackets, state credits, local taxes, SDI calculations... your formulas have formulas. One wrong cell reference and everything's off.
Employee just got back from a 60-day assignment and payroll needs the calculation by EOD. No pressure, right?
Built by manufacturing professionals who've done thousands of these calculations manually. We automated the pain away so you can focus on what matters.
Input employee info, dates, wages. Click calculate. Get exact tax liability with full breakdown. What used to take 3 hours now takes less time than making coffee.
We know all the reciprocal agreements. If they exist, we catch them. No more manually checking if Ohio and Pennsylvania have a deal (they do, by the way).
Actual 2024-2025 state tax brackets, local tax estimates, SDI calculations for CA. Not some generic estimate - actual progressive bracket math.
Automatically creates 4 payment options (1, 6, 12, 24 pay periods). Show employees their choices instantly instead of doing more math.
One-click export to PDF. Full calculation breakdown, payment plan, disclaimers. Send to employee, save for records. Done.
Built-in protection. Clear disclaimers, "not tax advice" notices, professional review recommendations. We cover the bases.
Employee name, home state, work state, assignment dates, wages earned during assignment. Takes about 30 seconds.
Our engine checks reciprocity agreements, calculates state taxes, applies credits, factors in local taxes. Happens instantly.
See the full breakdown, pick a payment plan, download the PDF report. Share with employee or verify with your CPA.
We're testing with accounting departments right now. No credit card, no commitment, no catch. Just try it and see if it saves you time.
Access the Calculator Now →This is beta software from Machining Partner LLC. Calculations should be verified by a tax professional before use. We're actively testing and improving. That said, we've run hundreds of scenarios and it's accurate. But we're not lawyers, and this isn't tax advice.