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Worth writing about
A wrong answer. Tell us which calculator and the exact inputs you used, and it can be reproduced, checked against the official source, and fixed. Corrections get looked at before anything else.
A rate that has changed. Budgets and rate decisions move the figures. If an official source has moved and a page here has not caught up, the check date on that page will show it; say which page.
A calculator you want that does not exist yet. No promises, and genuinely useful suggestions tend to get built.
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