All rateable values are reassessed at a general revaluation. The most recent revaluation took effect from 1 April 2017. Revaluations make sure each ratepayer pays their fair contribution and no more, by ensuring that the share of the national rates bill paid by any one ratepayer reflects changes over time in the value of their property relative to others.
Check the 2017 valuation of your property www.gov.uk
Transitional Arrangement Scheme
A £3.6 billion transitional relief scheme limits changes in rate bills as a result of the 2017 revaluation. To help pay for the limits on increases in bills, there are also limits on reductions in bills. Under the transitional scheme, limits continue to apply to yearly increases and decreases until the full amount is due (rateable value times the appropriate multiplier). The scheme applies only to the bill based on a property at the time of the revaluation. If there are any changes to the property after 1st April 2017, transitional arrangements will not normally apply to the part of a bill that relates to any increase in rateable value due to those changes. Changes to your bill as a result of other reasons (such as changes to the amount of small business rate relief) are not covered by the transitional arrangements.
The transitional arrangements are applied automatically and are shown on the front of your bill. Further information about transitional arrangements and other reliefs may be obtained from Oldham Councils Business Rates Department or www.gov.uk/introduction-to-business-rates
You can find out more about Revaluation on the Gov.uk website www.gov.uk