Apart from properties that are exempt from business rates, each non-domestic property has a rateable value which is set by the valuation officers of the Valuation Office Agency (VOA), an agency of Her Majesty's Revenue and Customs. They draw up and maintain a full list of all rateable values, which are available here
The rateable value of your property is shown on the front of your bill. This broadly represents the yearly rent the property could have been let for on the open market on a particular date. For the revaluation that came into effect on 1st April 2017, this date was set as 1st April 2015.
The valuation officer may alter the value if circumstances change. The ratepayer (and certain others who have an interest in the property) can appeal against the value shown in the list if they believe it is wrong. Full details on your rights of appeal are available here. Your billing authority can only backdate any business rates rebate to the date from which any change to the list is to have effect.
The Valuation Office Agency will continue to fulfil their legal obligations to alter rating assessments if new information comes to light indicating the valuation is inaccurate.
Please note that should you appeal you cannot withhold payment of your business rates bill either in full or in part. However, if your appeal is successful and you have paid too much in business rates your overpayment will be refunded. Also, provided we have not had to take you to court to recover unpaid business rates, you may be entitled to interest on your overpayment.
Further information about the grounds on which appeals may be made and the process for doing so can be found on the www.gov.uk website or obtained from your local valuation office at
firstname.lastname@example.org or by phoning 03000 501 501.