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Send the page address, the figure you saw, and the figure you expected. If you have a payslip or another calculator that disagrees, say which and what it produced.

State, filing status and pay frequency are useful context. A difference may come from a local tax, pre-tax deduction, year-to-date withholding, employer contribution, source change or an error in the site.

Reports may be compared with the source cited on the page and with the calculation's assumptions. Confirmed issues are intended to be corrected in shared data or code where practical.

A report may also reveal a missing assumption or a difference between withholding and final tax. Review timing, a reply and a particular outcome cannot be guaranteed.

Questions about your own tax position cannot be answered here. This site publishes estimates from public rate tables and is not in a position to advise anyone on their own affairs.