Apply Partial Payments Without Losing Invoice Balances
Apply a partial customer payment to the specific invoice it relates to and leave the unpaid remainder open. Preserve the original invoice amount and the history of each payment. A partial payment should not create a second sale if the invoice’s revenue has already been recorded.
Match the payment to the customer’s intention
Use the invoice reference, remittance note or an agreed allocation. If one payment covers several invoices, divide it accordingly. If the intended invoice is unclear, resolve the question rather than applying the money at random. Incorrect allocation can make one invoice look overdue while another appears overpaid.
Keep the arithmetic visible
For illustration, a $1,800 invoice followed by a $700 payment leaves $1,100 outstanding before any credits or other adjustments. A second payment of $600 leaves $500. The customer account should show each receipt and the remaining balance, while the bank records show the money actually received.
Account for fees and differences separately
If a platform deducts a processing fee, the net bank deposit may be smaller than the customer payment. The customer should not automatically remain overdue for the fee your business incurred. Discounts, credits and write offs also require documented treatment rather than an unexplained reduction of the invoice. Reconcile the customer balance and the bank receipt together so the collection record and the financial reports tell the same story.