Guides
Paycheck & payroll tax guides
Our first guides are in progress. Here's what's coming.
Federal · Coming soon
How federal income tax withholding works
What your W-4 tells your employer, and why withholding is not the same as the tax you owe.
Payroll taxes · Coming soon
FICA explained: Social Security and Medicare
The two payroll taxes on almost every paycheck, the wage base, and the additional Medicare tax.
Deductions · Coming soon
Pre-tax vs. post-tax deductions
How 401(k), HSA and health premiums change your taxable wages — and which ones don't.