A replacement hire machine can leave two charges on the account

One hire became two machine records

A machine broke down and a replacement was delivered to keep the customer's job moving. Months later, the plant-hire account is unpaid and the customer challenges overlapping charges. Reconstruct the substitution before demanding the entire balance. Two equipment records may reflect a legitimate changeover, an accounting error or terms that need explanation, rather than automatically proving two separate full hire periods.

Match the equipment by identifier

Locate the original and replacement machine identifiers, delivery documents and collection records. Use serial or asset numbers where available instead of relying only on descriptions such as excavator. Confirm which entity hired the equipment. A similar model name or a driver's recollection may be insufficient to explain which item was on the site on each disputed day.

Keep the accounting trail intact

Business.gov.au includes expense and income records in its record-keeping guidance. Link the hire invoices to the relevant changeover documents and correspondence. Preserve the original entries while investigating. Do not delete a charge simply to make the account match the customer's preferred total, or insist that a software-generated overlap establishes an entitlement without checking the agreement.

Source: business.gov.au: Record keeping

Build a simple hypothetical timeline

Imagine a hire business delivering a replacement on Tuesday and collecting the original on Thursday. The account shows both items for those days. The records need to establish the reason for the overlap and the applicable charging terms. The example does not decide whether both charges are payable; it identifies the interval that needs a supported explanation.

Resolve the specific charging question

Read the provisions and communications relevant to breakdowns, substitutions and off-hire. Ask an adviser where the effect is unclear or disputed. Explain the calculation to the customer using the identified dates and records. If a correction is justified, make it traceable and update the balance. Keep an unrelated damage allegation or missing accessory separate from the substitution calculation.

Pursue the reconciled account

Once the changeover is explained, identify the remaining unpaid balance and appropriate next step. Retain the reconciliation for anyone handling recovery. Improve future swap records by recording both asset numbers and the agreed arrangement at the time. A precise substitution history is more useful than repeated demands for an account the customer can challenge because nobody can explain the overlap.