From Ledger to Last Number: Six Evidence Checks for a UK Final Account

A final account often arrives carrying more history than certainty. Interim valuations have been certified, variations have been instructed and disputed, provisional sums have been spent or omitted, retention has been withheld, and loss-and-expense claims may still sit outside the main ledger. By the time the last number is presented, there is a natural pressure to settle the residual items in one movement.

That pressure is understandable, but it is a poor basis for agreement. The final account is not a separate negotiation that begins when the project ends. It is the conclusion of the commercial record. If the record is incomplete, the last number will be defensible only by assertion. A more reliable approach is to treat the final account as an evidence audit before it becomes a signed statement.

The six checks below are not designed to prolong the process. They are designed to replace endgame fog with a clear position that can be explained to a finance director, an auditor or, if necessary, a tribunal.

1. Follow the variation trail from instruction to valuation

Every variation in the final account should be traceable through three stages: authorisation, valuation and incorporation. Authorisation may be a formal instruction, a written confirmation of a verbal direction, or a contract mechanism that allows a change to be priced before instruction. Valuation should show the basis used: contract rates, agreed rates, dayworks, or a measured assessment. Incorporation should show where the amount has been included in interim valuations and whether it has already been paid.

The common failures are familiar. A variation appears in the final account but not in the variation register. The same change is valued once as a variation and again within a remeasured item. A disputed instruction is treated as agreed because work proceeded. A confirmed instruction is omitted because it was never priced.

A reconciliation between the variation register and the final account is therefore essential. It should identify agreed, disputed and withdrawn items, and it should show the value already included in interim certificates. Without that reconciliation, the final account is carrying unverified history.

2. Test the measurement assumptions, not just the quantities

Final accounts frequently turn on measurement rather than price. The parties may agree the rates but disagree about what has been measured, where boundaries lie, or which drawing revision governs. Before the last number is accepted, the measurement assumptions should be recorded in plain terms.

Ask which rules of measurement apply, which drawings and revisions were used, and whether the account is based on re-measurement or on the tender quantities. Where re-measurement has taken place, check that it reflects the contract scope rather than a revised design introduced later. Where quantities remain provisional, identify them as such rather than allowing them to disappear into a consolidated figure.

Measurement is not a second tender. It should not become an opportunity to reopen rates that were fixed at award. The test is whether the quantities and boundaries can be explained from contemporaneous records. If they cannot, the final account is relying on memory.

3. Reconcile provisional sums and their adjustments

Provisional sums deserve their own schedule. A defined provisional sum should be adjusted only in accordance with the contract and the instruction that governs the work. An undefined provisional sum may require a different treatment, often involving instruction and valuation before the work is carried out. In either case, the final account should show what was allowed, what was instructed, what was measured, and what has been omitted.

The risk is double counting. Work that was covered by a provisional sum may also appear as a variation. Alternatively, a provisional sum may be omitted without a corresponding instruction, leaving the account short of the work actually carried out. A simple adjustment table, cross-referenced to instructions and valuations, is more useful than a narrative explanation at the end.

Where the position is unresolved, say so. A provisional sum that has not been properly adjusted should not be presented as settled simply because the overall account has been agreed.

4. Confirm the retention and defects position

Retention is often treated as a rounding item in the final account, but it has its own contractual triggers. The account should show the retention percentage, the amounts already withheld, the release events, and the amounts now due or still held. Practical completion, making good defects, and the issue of the relevant certificate or notice all matter.

A defects schedule should support the position. If money is being withheld for defects, the schedule should identify the defects, their status and the estimated cost of remedy. If retention is being released, the account should confirm that the release is not conditional on unrelated matters. Retention is a security mechanism, not a general bargaining chip.

This check matters because retention disputes can reopen an otherwise agreed account. A clear statement of what is released, what remains held and why is more valuable than a single net figure.

5. Separate unresolved loss-and-expense claims

Loss-and-expense claims should not be buried in the final account as though they were ordinary measured work. They require their own evidence: notices given in accordance with the contract, instructions or events that caused the loss, contemporaneous programme and cost records, and a clear link between cause and effect. Mitigation should also be visible.

If a claim is unresolved, the final account should record it as reserved rather than absorbed. Agreeing a global sum that quietly includes an unquantified claim creates ambiguity about what has been settled. Conversely, excluding a claim without recording the reservation may prejudice the claiming party's position.

The practical test is whether the final account states, in terms, which claims are included, which are excluded and which remain open. That statement is as important as the arithmetic.

6. Reconcile the final number to the payment ledger

The last check is the least glamorous and among the most important. The final account should reconcile to the interim payment ledger. Check valuations, payments, contra charges, materials on site, retention and any sums already agreed. Confirm that the arithmetic is consistent and that no item has been included twice under different descriptions.

Authority should also be checked. The person signing the final account should have the authority to bind the organisation, and any conditional wording should be reviewed before signature. A final account that is agreed 'subject to contract' or 'without prejudice' may not achieve what the parties expect.

For UK commercial teams in 2026, the final account is likely to remain a point of commercial pressure. That is all the more reason to make it a point of evidence. SEH Ltd's view is that the last number should be the conclusion of the record, not a substitute for it. Six checks will not remove every dispute, but they can ensure that the number being agreed is one the organisation can explain, defend and close.