Payroll & Tax Calculators
Specialized engines for the complex edge cases standard payroll software misses.
FREE tools are available to everyone.PRO PLAN tools require a subscription.
No Tax on Overtime Calculator
Estimate your federal tax savings from the new overtime deduction. Deduct up to $12,500 (single) or $25,000 (MFJ) of qualified OT premium pay.
Launch CalculatorBonus Tax Estimator
Supplemental flat rate (22%) vs. aggregate method — side-by-side. See exactly what the employee takes home before you approve the bonus.
Launch EstimatorMulti-Period OT Tracker
Track overtime across multiple pay periods using FLSA weighted-average and fluctuating workweek methods. Catches underpayment exposure before a DOL audit does.
Launch TrackerPaycheck Explainer
Plain-English breakdown of every deduction — federal tax, Social Security, Medicare, and state. Built for employees who want to understand their paycheck.
Launch ExplainerPay Raise Impact Calculator
See both sides of a raise: what the employee actually takes home, and what it truly costs the company including FICA, FUTA, and SUTA.
Launch CalculatorPayroll Calendar Generator
Generate your full-year payroll schedule with pay dates, processing deadlines, IRS deposit due dates, and federal holidays flagged. Printable PDF.
Launch CalendarFLSA Overtime Calculator
Calculate the "Regular Rate of Pay" correctly when nondiscretionary bonuses are involved to ensure FLSA compliance.
Launch CalculatorGross-Up Calculator
Determine the exact gross amount needed to give an employee a specific net bonus, handling all taxes automatically.
Launch CalculatorRetro Pay Calculator
Calculate retroactive payments for raises that were effective in the past, including overtime adjustments.
Launch CalculatorW-4 Impact Simulator
Basic version is free. Advanced W-4 unlocks Step 2(c) guidance, scenario comparisons, and compliance PDFs.
Launch CalculatorWorker Classification Tool
Use the IRS 20-factor test to determine if a worker should be classified as an employee or independent contractor.
Launch ToolUS Tax Treaty Lookup
Instantly look up treaty article numbers, wage/scholarship caps, and recommended IRS form (8233 or W-8BEN) for any of 40 treaty countries.
Search TreatiesNRA Tax Wizard
The flagship tool. Determine Alien Tax Status (SPT), Treaty Eligibility, and generate 8233/W-8BEN forms instantly.
Launch WizardMulti-State Tax Nexus
Determine where remote employees owe state & local taxes. Checks reciprocity rules automatically.
Launch Calculator (Pro Plan)Garnishment Priority Engine
Resolve conflicting court orders (levies, child support) using federal CCPA priority rules.
Launch Calculator (Pro Plan)