Contact
Found a wrong number, a broken link, or have a question about how a calculator works? This is the place.
Updated 17 Sept 2026
Email hello@rulecost.com for:
- A correction. Tell us which calculator, what number looks wrong, and — if you have it — the source you’re comparing it against. This is the fastest kind of message for us to act on.
- A methodology question. If a calculator’s assumptions or sources aren’t clear from its page, ask and we’ll clarify (and usually improve the page for the next person with the same question).
- A rule you think we should cover. We can’t promise to build every suggestion, but we do read them.
What we can’t help with
RuleCost isn’t a financial advisor, tax preparer, or law firm, so we can’t give you personalized advice about your own return, claim, or filing — see the disclaimer. For that, a licensed professional or the relevant government agency is the right place to ask.
We aim to reply within a few business days, though corrections that need source-checking can take a little longer.