What the Multiplier Misses: Auditing a UK Office Business Rates Bill in 2026

Business rates are rarely the reason a small company chooses an office. They are, however, frequently the reason an otherwise sound occupancy budget drifts. England’s 2026 revaluation has produced new rateable values for many offices, and the first bills issued under those values deserve more scrutiny than they often receive. A rates bill is not a single number; it is a calculation with inputs, dates, reliefs and assumptions. Before a tenant signs another lease, or agrees a renewal on the same terms, it is worth auditing those inputs.

This is an editorial guide rather than valuation or legal advice. It focuses on England, where the 2026 revaluation applies; Wales, Scotland and Northern Ireland operate different systems and cycles. The principles of checking the bill, however, travel well.

Start with the building blocks of the bill

A business rates bill normally shows the rateable value, the multiplier in pence per pound, the chargeable amount before reliefs, any reliefs or adjustments, and the payment schedule. The rateable value is the assessment of the property’s annual rental value on a prescribed date, not the rent the tenant happens to pay. The multiplier is set annually, with separate small and large multipliers in England. The bill should also identify the assessment period and the property to which it relates.

Small occupiers should compare the description on the bill with the space they actually occupy. Does the floor area match the lease plan? Is the assessment for the whole suite, part of a floor, or a shared building? Are car parking spaces, storage or plant included? A rates assessment can be correct in principle but wrong in detail, and those details matter when the bill is based on floor area or a specified part of a building.

Errors that survive the first glance

Some errors are obvious: the wrong address, a duplicated assessment, or a bill for a period after the lease ended. Others are quieter. A property may be assessed for more floor space than the tenant controls. Shared areas may be treated inconsistently. A change of use may not have been reflected. A relief that was applied in a previous year may have dropped off the account. An empty property period may be missing from the calculation.

Tenants should also check dates. Business rates liability normally follows occupation, so the start and end dates on the bill should align with the lease and with any rent-free or fit-out period. If the tenant has vacated, empty property relief may apply for a limited period, depending on the property type and local rules. If the property was vacant before occupation, the bill should not attribute that period to the new tenant without good reason.

Reliefs are not automatic in every case

Reliefs can materially change the amount payable, but they are not always applied without an application or confirmation. Small business rate relief may be available where the rateable value is below the relevant threshold and the occupier meets the conditions. Transitional relief may phase in increases following a revaluation. Charitable and other reliefs depend on the occupier and the use of the property. The billing authority can explain which reliefs are on the account and what evidence is needed.

A useful discipline is to ask for a breakdown rather than a balance. The question is not simply “what do I owe?” but “how was this figure produced, and which reliefs have been assumed?” If a relief has been applied, the tenant should know its basis and duration. If it has not, the tenant should know whether an application is outstanding.

Put rates into the lease comparison

Rates belong in the total occupancy cost, alongside rent, service charge, insurance and utilities. A lower rent in one location can be offset by a higher rateable value, just as a higher rent in another may come with a lower rates burden. For small teams, it is often more revealing to compare cost per desk or cost per square metre of usable space than to compare headline rents alone.

Before signing, the tenant should establish who is liable for rates under the lease, what happens during fit-out and any rent-free period, and whether the landlord has made assumptions about the assessment. If the tenant is taking a new suite, the assessment may not yet reflect the final layout. If the tenant is renewing, the existing assessment may be based on an older configuration. These points should be recorded in the negotiation file, not left to the first bill.

A short audit checklist

Request the current bill, the rateable value summary and any relief decisions. Compare the property description and floor area with the lease plan. Check the effective dates against occupation. Confirm whether empty property relief or small business rate relief has been considered. Ask the billing authority to explain any adjustment. Keep a diary of appeal and application deadlines. If the figures are material to the decision, take professional advice before exchanging contracts.

The 2026 revaluation is not a reason to panic, but it is a reason to read the bill properly. A small occupier who understands the calculation is better placed to challenge errors, claim the reliefs that apply and compare one office against another on a true occupancy cost.