Editorial policy

Figures

Every figure on the site is either computed by the rules engine from a value with a primary source and a verified date, or cited to a named external table with a link and the date it was retrieved. No figure is typed into a page from memory. A rule that cannot be traced to a source is left empty and shown as not set.

Values are re-verified against their source pages before each tax year, after each fiscal event, and whenever a weekly check finds that a source page has changed. The verified date on each value is updated only when a person has read the source again.

Guides and pages

A guide answers one question, with the number in its first two sentences. It describes and compares; it does not advise. Every guide names its author and shows when it was last reviewed. Each is read by a person before it goes live and after any rule it depends on changes.

Corrections

A wrong figure is fixed within a day of being confirmed, a test fixture is added so it cannot recur, and the change is recorded on the corrections page with the dates it was wrong and who it affected.