Wrong tax rate, broken calculation, display glitch — we want to know. Every report is read and acted on.
No login needed to report. Just fill in the form. Add your email only if you'd like a reply.
We'll review and fix it as fast as we can. If you left your email, we'll reply once resolved.
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Send details to bugs@comfincalc.com — include the country, input values, result you got vs. expected.
Linking to the official government source (HMRC, IRS, CBDT…) helps us fix rate issues much faster.