Because bands rest on valuations done in a hurry in the early 1990s (here's how banding works), a meaningful number of homes sit in the wrong band. Challenging is free and can bring years of backdated refunds — but it can also move your band up, so do the checks first.
Step 1 — compare with your neighbours
Every band in the country is public. Check yours and your street's on gov.uk (England and Wales) or the Scottish Assessors' portal. If identical homes on your street are a band lower, that is your starting evidence. Our band checker shows what each band costs in your council, and the calculator tells you exactly what a successful challenge would save each year.
Step 2 — do the 1991 valuation test
The band reflects what your home was worth on 1 April 1991 (2003 in Wales). Estimate backwards: take a sale price for your home or a near-identical one, and deflate it to 1991 using a house-price index for your region. If the 1991 estimate lands clearly inside a lower band's range, you have a case. If it is marginal, think twice — reviews can go the other way.
Step 3 — make the challenge
In England and Wales you challenge through the Valuation Office Agency (VOA). If you have been the taxpayer for less than six months you can make a formal proposal the VOA must consider; beyond that, you can still request an informal review with evidence. In Scotland, you lodge a proposal with your local assessor through the Scottish Assessors Association. If the decision goes against you, there is a free route of appeal to a valuation tribunal.
While you wait
Keep paying. If your challenge succeeds, the council refunds the difference — often backdated to when you became the taxpayer, in some cases as far back as 1993. And whether or not your band is right, check you are not missing discounts and exemptions — a 25% single-person discount usually beats a one-band reduction.