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The most useful thing you can send is a figure that is wrong. Every tax number on this site is traceable to a published source, so if a calculator does not match your pay stub, say which state, which pay frequency and what your stub shows, and it can be checked against the source rather than argued about.
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What this site does and does not do
These calculators are estimates for planning, not tax advice, and no one here is a licensed tax preparer. Questions about your own return, a notice you have received, or what you owe belong with a CPA, an enrolled agent, or the IRS directly. What can be answered here is where a number came from, why it differs from your stub, and whether the figure is out of date.
The sources behind every figure are listed on methodology, and who publishes this site is on about.