These are different tools for different jobs. Understanding which one you need depends on whether you’re an employer running payroll or an employee planning your annual withholding.
Withhold Right
You’re running payroll. You need to know how much to withhold from each paycheck this pay period — federal income tax, FICA, and state. Withhold Right answers that question using IRS Publication 15-T and official state withholding formulas.
IRS Tax Withholding Estimator
Your employee wants to adjust their W-4 so they owe less (or get a smaller refund) at year end. The IRS estimator walks them through their annual tax picture and recommends how many allowances or extra withholding to claim.
| Withhold Right | IRS Estimator | |
|---|---|---|
| Primary user | Employer / bookkeeper | Employee |
| Output | Per-paycheck withholding amount | Recommended W-4 elections for target refund/balance |
| Calculation basis | IRS Pub 15-T employer withholding tables | Annual tax liability estimation |
| Pay period support | Weekly, biweekly, semimonthly, monthly | Annual only |
| State income tax | 11 states with per-period calculations | Not included |
| FICA (SS + Medicare) | Yes — with wage base cutoff | Not included |
| Bonus withholding | Yes — IRS 22%/37% flat-rate method | Not included |
| Account required | No | No |
| Data stored | None — runs in browser | Session only |
| Cost | Free | Free |
The IRS Tax Withholding Estimator works backwards from a desired annual outcome — it tells an employee “change your W-4 to withhold an extra $X per period so you break even at filing.” It is not designed to answer the employer’s question: “given this employee’s W-4, how much do I withhold from this paycheck?”
That calculation — the periodic withholding amount — comes from IRS Publication 15-T, specifically the Percentage Method Tables for Automated Payroll Systems. Withhold Right implements that formula directly, along with the equivalent formulas from each supported state revenue authority.
Full payroll software (Gusto, QuickBooks Payroll, ADP) also does this calculation, but those products cost $40–$80/month and require an account. Withhold Right is the free, instant option for small businesses who just need the number.
The IRS Tax Withholding Estimator (irs.gov/W4app) is an employee-facing tool designed to help individuals decide how to fill out their W-4 form. It estimates annual tax liability and tells the employee whether they are on track to owe or receive a refund. It is not designed for employers to calculate per-paycheck withholding amounts.
Withhold Right is an employer-side payroll withholding calculator. It takes an employee's gross wages and W-4 elections and tells the employer exactly how much to withhold from each paycheck — federal income tax, Social Security, Medicare, and state income tax. It is built from IRS Publication 15-T and state revenue authority formulas.
Use Withhold Right. As an employer, you need to know how much to withhold from each paycheck — that is what Withhold Right calculates. The IRS Tax Withholding Estimator is for your employees to use when deciding how to fill out their W-4.
They serve different audiences. Withhold Right is for employers calculating payroll. The IRS estimator is for employees planning their annual withholding. Withhold Right fills the gap for employers who need a fast, accurate per-paycheck calculation without a full payroll subscription.
Free, accurate, no account required. Results update as you type.
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