How the figures get here
Every figure here has a page, a date and a person who read it.
Every rate, threshold and fee this site uses is a record with a publisher, a URL, the date a person opened that page, and a note on how they confirmed it. The calculators compute from those records. So do the two pages below — which is why neither can disagree with the engine.
- Records
- 38
- Confirmed against the publisher
- 31
- Offices
- 12
- Withheld
- 1
- Last read
- 31 Aug 2026
What the two dates mean
Effective from is the day the rule itself started applying — it comes from the legislation or the office's own page, and it does not change. Last read is the day a person opened the source and confirmed the figure still said what we store. A rule from 2019 that was checked last week carries both dates, and they are not interchangeable: one tells you the rule is current, the other tells you we looked.
What happens when a figure cannot be verified
It is withheld. Not estimated, not carried over from last year, not averaged from somewhere else — the calculator shows the gap and says which record it is waiting on. There is one such figure today.
The same rule governs what gets published. An article that would need a withheld figure does not get written, and the build refuses it — an answer page names the records it rests on, and a page resting on a withheld one fails the checks rather than shipping.
What this is not
These are calculators, not advice. They compute published rules against numbers you type, and they show the working so you can check both. They do not know your circumstances, and nothing here is a substitute for a registered tax agent, a licensed adviser or a conveyancer.