Look at an English council tax bill and you will usually see the council's charge split in two: the main element and a line called something like “adult social care”. That second line is the adult social care (ASC) precept, and it explains a lot of the small print — and some of the confusion — around annual rises.
Why it exists
Since 2016, central government has let councils that provide social care raise extra council tax specifically for it, typically up to 2% a year on top of the core referendum limit. It was designed as a stopgap for care funding; a decade on it is effectively permanent.
The compounding trap
The precept compounds in a way bills don't make obvious: each year's percentage is calculated on the whole previous bill, then folded into the base. Two councils showing the same “4.99%” rise (2.99% core + 2% ASC) can therefore carry different ASC cash amounts depending on when they started charging it and whether they ever skipped a year. This is why we record each council's own wording — you will see ASC notes on individual council pages wherever the council publishes the split.
Reading your own bill
To see what you are actually paying: find your council's page via the band checker, note the headline for your band, then check the council's source page (linked on every page) for the ASC split. And remember the precept only applies in England — Scottish bills have their own quirk, and Welsh councils fund social care within the main charge. For how the rest of your bill stacks up, see how bands and precepts work.