When one materials invoice covers two jobs, retain one source invoice and document the supported amount assigned to each job. The allocated amounts should add back to the original record. A split is useful only when another person can understand why it was made.
Start with invoice detail
Check the supplier, invoice number, date, line items, delivery references, and payment status. Ask the project contact to identify where the materials went if the invoice does not supply enough detail.
Do not allocate by whichever job has budget remaining. A bookkeeping allocation should describe the documented activity, not make the management report look more comfortable.
Work through an illustrative split
Suppose a $1,200 invoice contains materials delivered to two jobs. Supported delivery records identify $720 for Job A and $480 for Job B.
| Source reference | Job | Amount |
|---|---|---|
| Invoice INV-204 | A | $720 |
| Invoice INV-204 | B | $480 |
| Total linked to INV-204 | $1,200 |
The arithmetic confirms that the split preserves the invoice total. It does not establish that the allocation basis is correct; the delivery or quantity records provide that evidence.
Record the basis beside the split
Keep the supporting document reference, preparer, confirmation source, and date. If an invoice line must be divided, state whether the split follows quantities, documented usage, or another approved basis. Do not describe an estimate as measured usage.
If the evidence is not available, identify the amount as awaiting allocation and assign the question. A visible incomplete record is more honest than precise-looking unsupported job costs.
Reconcile the payment separately
The supplier payment settles the invoice according to the actual payment record. Avoid entering two full $1,200 invoices just because two jobs share the purchase. Check for an existing bill before adding bank-feed activity so the cash payment does not become another recorded purchase.
Follow later credits back to the source
A supplier return may relate to only one part of the original split. Match the credit to the original invoice and affected job using the available evidence. Dividing every credit in the same ratio as the original invoice may be wrong when the returned materials came from one job.
Use the job-code map to define how shared invoices and uncertain allocations move from the field to the bookkeeping desk.
Sources and further reading
Source links provide background. The workflow and illustrative examples above are original educational material.