The Local Government Finance Act 1988 (Non-Domestic Rating Multipliers) (England) Order 2018

In relation to England, the small business non-domestic rating multiplier is calculated in accordance with paragraph 3 of Schedule 7 to the Local Government Finance Act 1988 for each financial year when new rating lists are not being compiled.

Link: The Local Government Finance Act 1988 (Non-Domestic Rating Multipliers) (England) Order 2018
Source: Legislation .gov.uk