Official sources only
Official Paycheck & Tax Sources
The primary references for verifying payroll withholding — never a substitute for a published, reviewed rule set.
Verification status
These are official reference links, not a claim of active tax coverage. No federal, FICA or state withholding configurations have been published yet.
IRS Publication 15-T
Federal income tax withholding methods and tables. Check the edition for the relevant tax year.
IRS Publication 15
Employer payroll tax guidance, including Social Security and Medicare.
IRS Form W-4
Employee withholding certificate and the instructions for Steps 1–4.
Social Security Administration
Official contribution and benefit base information by year.
State and local sources
A state or local rule must be checked against its own tax agency's current withholding guidance before coverage is enabled. No state or local tax rates have been seeded.