The Assessment You Didn't Commission: Auditing Your 2026 Rates Position
Photo: Stephen McKay , CC BY-SA 2.0, via Wikimedia Commons
For many UK SME occupiers, the 2026 business rates revaluation has arrived as an adjusted direct debit rather than a managed financial event. The bill is received, coded to the premises account and paid. Yet the figure underneath it — the rateable value — is an assessment of the property, not a negotiation, and it can be wrong in ways that persist for years if nobody checks.
The revaluation in England took effect on 1 April 2026, with separate cycles in the devolved administrations. For finance and operations leads, the practical question is not whether the revaluation was fair in the abstract. It is whether the assessment, the reliefs applied and the treatment of vacant space match how the premises are actually used. A five-point audit provides a proportionate control for an SME with one site or a small portfolio.
1. Confirm the valuation basis reflects the building you occupy
Start with the physical facts. The rateable value is based on the rental value of the property at a defined valuation date, subject to statutory assumptions. Small differences in floor area, use or layout can move the assessment. Check the stated areas against the lease plan, measured survey and any internal fit-out drawings. Confirm that car parking, storage, mezzanine space and plant are treated consistently with the occupier’s understanding.
Look for changes that may not have been reflected: a partition removed, a yard brought into use, a change from storage to customer-facing space, or an alteration that affects the usable area. Equally, check for items that should not sit in the assessment. The aim is not to argue the rating system, but to ensure the factual description of the hereditament is accurate. Keep photographs, plans and correspondence in a single file.
2. Test improvement relief before it expires
Where qualifying improvements have been made, improvement relief can reduce the rates bill for a limited period. The relief is time-bound and conditional, so the audit should establish whether works completed in recent years are eligible and whether the relief has actually been applied. Fit-out works, extensions and qualifying alterations are the usual candidates.
Finance leads should collect completion dates, invoices and specifications. Operations should confirm what was done and when the space came into use. If relief has not been claimed, calculate whether a claim is still available. If it has been applied, verify the period and the calculation. A relief that is assumed but not documented is a budgeting risk; one that is available but unclaimed is an avoidable cost.
3. Rebuild the bill from the transitional scheme
Revaluation does not always translate immediately into the full new liability. Transitional arrangements phase the change for some properties, and the calculation can include caps, supplements or adjustments that are not obvious from the headline rateable value. Ask the billing authority for a breakdown of the charge and reconcile it to the rateable value, the multiplier and any reliefs.
Compare the current bill with the previous year on a like-for-like basis. Identify each movement: rateable value, multiplier, relief, transitional adjustment and any backdated correction. Where a transitional scheme applies, confirm the property’s starting position and the phase-in percentage. This is a control exercise, not an invitation to withhold payment. Rates remain payable while a challenge is considered, and non-payment attracts its own consequences.
4. Account for vacant space separately
Vacant space is often treated as a single line in the property budget, but it can change the rates position. Empty property relief is subject to exemptions, occupation tests and time limits, and partial vacancy may need to be reflected in the assessment. The audit should identify which areas are genuinely vacant, for how long, and whether the billing authority has been notified.
Operations should walk the site and record actual use. Finance should check that reliefs and exemptions match that record. If a lease permits subletting or temporary occupation, consider whether a short-term arrangement changes the treatment. The objective is to avoid both overpayment and unexpected clawback. Documentary evidence of vacancy — dated photographs, utility readings and security logs — is more useful than a retrospective description.
5. Diarise the challenge window and build the evidence pack
Where the assessment appears wrong, there is a formal route to challenge. The window is not indefinite, and the process has stages that require evidence rather than assertion. Confirm the relevant deadline for the 2026 list with the Valuation Office Agency or a rating adviser, and record it in the finance calendar. Do not rely on an informal query to preserve the position.
A usable evidence pack includes the lease, plans, measured areas, photographs, invoices for works, correspondence with the authority and a short chronology of occupation and changes. The pack should explain the specific error and the corrected basis sought. Vague claims about the burden of rates are unlikely to succeed; a documented discrepancy in area or use is a different matter.
A twelve-month control routine
Treat the rates bill as a budget line with an owner and a review date. Assign finance to reconcile the bill and operations to verify the property facts. Review the position quarterly, and again before the next annual billing cycle. Model a reasonable range for the next twelve months rather than assuming the current figure is fixed.
The revaluation may have produced a correct bill. The audit exists to prove it, or to correct it while the evidence is fresh. For an SME, that is a modest exercise with a clear cash consequence: a verified assessment, reliefs that are claimed and documented, and a rates budget that reflects the premises as they are actually used.
