An unexpected business rates bill can put real pressure on cash flow, particularly where the figure has risen without an obvious change to your premises. Knowing how to calculate business rates gives you a practical way to sense-check the charge, identify available reliefs and recognise when the rateable value may deserve closer scrutiny.
Business rates apply to most non-domestic properties in England and Wales, including shops, offices, warehouses, factories, pubs and many other commercial premises. The calculation starts with a published rateable value, but your final bill is not always as simple as multiplying that figure by a single percentage. Reliefs, transitional arrangements, occupancy changes and previous adjustments can all affect what you pay.
The basic business rates calculation
At its simplest, the annual charge is calculated as follows:
Rateable value × business rates multiplier = gross annual business rates liability
The rateable value is set by the Valuation Office Agency, often referred to as the VOA. It is not the amount of rent you actually pay. Instead, it represents an estimate of the annual rent the property could have achieved on the open market at a specified valuation date, using statutory assumptions.
The multiplier, sometimes called the poundage, is set each year. In England, there is generally a small business multiplier and a standard multiplier. The multiplier that applies can depend on the rateable value and the circumstances of the ratepayer. Wales has its own multiplier and relief arrangements.
This calculation produces the starting point for your bill. Your local council then applies any relevant reliefs, exemptions, supplements or adjustments before issuing the final demand.
How to calculate business rates step by step
Find the correct rateable value
Start with the rateable value shown on your rates bill or on the relevant rating list. Check that it relates to the precise premises you occupy. This sounds obvious, but errors can arise where properties have been split, combined, extended, partly demolished or changed in use.
Also check the description of the property. A warehouse with offices, for example, should reflect the right areas and the appropriate balance of uses. If part of a building is no longer occupied, has become unusable or has been removed, the assessment may not reflect the property as it stands.
Use the applicable multiplier
Multiply the rateable value by the multiplier for the financial year in question. The multiplier is expressed as pence in the pound, so a multiplier of 55p is entered into the calculation as 0.55.
For illustration only, a property with a rateable value of £42,000 and a multiplier of 0.55 would have a gross annual liability of:
£42,000 × 0.55 = £23,100
That is not necessarily the amount payable. It is the figure before reliefs and other billing adjustments. Always use the multiplier published for the relevant year rather than relying on an example or a previous bill.
Apply reliefs and adjustments
Relief can make a substantial difference, particularly for smaller occupiers and businesses affected by local circumstances. Depending on the property, business and location, your bill may be reduced by Small Business Rate Relief, rural rate relief, charitable relief, retail, hospitality and leisure relief, or a local discretionary scheme.
Some reliefs are applied automatically, while others require an application to the local council. Eligibility can depend on matters such as the rateable value, how many properties the business occupies, the type of use and whether the ratepayer meets the conditions of a time-limited scheme.
You may also see transitional relief on a bill. This can limit how quickly the payable amount rises or falls after a revaluation. It means the bill may differ from a straightforward rateable value multiplied by the current multiplier, even where the valuation itself is correct.
Divide the annual amount into instalments
Business rates are usually collected in monthly instalments. Using the example above, a £23,100 annual liability would equate to £2,310 per month over ten instalments before any further adjustment. Many councils can offer twelve monthly instalments if requested, which may help businesses manage cash flow more evenly.
A bill can also include credits, arrears, backdated changes or adjustments from a previous period. For that reason, the total shown on a demand should be compared with the annual calculation and the explanation provided by the council, rather than treated as a standalone figure.
What can change your final business rates bill?
The rateable value and multiplier are central, but they do not tell the whole story. Whether a property is occupied is often significant. Empty-property relief may apply for a limited initial period, although the rules and exemptions can be complex and depend on the type of premises and its condition.
Material changes to the property or its locality can also matter. Examples include building works that prevent normal use, restricted access, flooding, fire damage, roadworks or the loss of essential facilities. Not every disruption leads to a reduction, and the evidence needs to show a genuine impact on the property’s value or use. However, dismissing a change simply because it appears temporary can mean missing a legitimate opportunity to seek an adjustment.
The nature of the occupation is relevant too. A business that occupies more than one property may not qualify for the same level of small business relief as a single-site occupier. Conversely, a company with several premises should still review each assessment individually. A portfolio can contain both fairly assessed properties and others that have been valued too highly.
Why the rateable value needs checking
The most meaningful way to reduce an ongoing liability is often to establish whether the rateable value is fair. The VOA assessment should reflect the statutory valuation assumptions and evidence from comparable properties, but commercial property is rarely identical from one unit to the next.
A higher rateable value may be difficult to justify where a property has poor layout, limited loading access, low eaves height, unusual configuration, restricted parking, inferior condition or a location that attracts lower rental demand than the evidence used by the VOA. For specialist properties, the valuation method can be more technical still.
The key question is not whether the rates bill feels expensive. It is whether the assessment accurately reflects the property and the evidence available for the relevant rating list. A successful challenge requires a properly evidenced case, not a broad objection to the cost of doing business.
Checking the bill before you pay too much
A useful review starts by comparing the information on the bill with the property on the ground. Confirm the address, rateable value, period charged, multiplier, named ratepayer and reliefs shown. Then consider whether there have been physical or trading-location changes that the assessment may not capture.
Keep supporting records where they are relevant. Plans, photographs, lease details, repair records, evidence of access restrictions and information about comparable local properties can all help establish the facts. Timing matters, particularly where a change has occurred during a rating period or where formal appeal deadlines apply.
In England, a challenge to a rateable value follows a formal process. Wales has its own procedures. The correct route depends on where the property is located and the reason for the proposed change. It is sensible to continue paying the bill while a case is considered unless the council confirms otherwise. Withholding payment can create avoidable recovery action, even where there is a genuine valuation dispute.
When specialist advice is worthwhile
You may be able to verify a simple calculation internally, especially if the property has a straightforward assessment and the correct relief is already in place. The position becomes less clear where the rateable value appears out of line with comparable premises, the property has unusual characteristics, or a change in circumstances may support a reduction.
For multi-site businesses, even a modest error across several assessments can become a significant overhead. A structured review can establish whether the values are fair, whether relief has been missed and whether there is a credible case for a formal challenge. Professional representation is particularly valuable where rental evidence, valuation methodology and procedural rules need careful handling.
Get Your Rates Right provides commercial property rating advice and formal appeal support for occupiers across England and Wales. A review by experienced surveyors can turn a confusing rates demand into a clear decision: pay with confidence, seek available relief, or challenge an assessment that does not reflect the reality of your premises.
The most useful next step is to treat your business rates bill as a figure that can be checked, not simply a fixed cost that must be accepted. A careful calculation and an informed valuation review may protect cash flow where it matters most.
