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What to write about

• A calculation looks wrong. If a calculator returns a figure that does not match the IRS form, the worksheet, or your own arithmetic, tell us. These are handled first.
• A number is out of date. Thresholds, caps and form line references change as the IRS publishes new guidance. If you have seen an official update that we have not reflected yet, a link to the IRS page is enough.
• Something on the site is broken or unclear. Broken links, layout problems, a guide that explains a rule confusingly, or a missing source citation.
• General questions and suggestions. Including deductions or calculators you would like to see covered.

Reporting a calculation error

Four things let us reproduce almost any problem on the first try:

• Which calculator you were using, or the address of the page.
• The values you entered — filing status, income, and the deduction-specific amounts.
• The result you saw and the result you expected, with the source you checked it against if you have one.
• Your browser, if the problem is visual rather than numerical.

Please do not send Social Security numbers, W-2s, tax returns, or any other document that identifies you. Rounded, made-up numbers that still reproduce the problem work just as well — and our calculators run entirely in your browser, so nothing you type into them is ever sent to us or stored.

When you will hear back

We aim to reply to every message within three business days. Confirmed calculation errors are corrected before we reply, so the answer usually arrives together with the fix. When a correction changes a published figure, the affected page's update date changes with it, so you can see for yourself that it has been applied.