Partial payment

A partial payment is a payment that covers only part of an invoice, leaving a balance outstanding. In accounting the invoice is then partially paid: the receipt is applied against it, the remaining amount stays open in accounts receivable, and the invoice does not close until the balance is settled, credited or written off.

Partial payment vs deposit vs instalment schedule

A partial payment is unplanned; a deposit and an instalment schedule are agreed before the invoice is raised. The amount received may look identical — half the total, say — but the accounting treatment and the follow-up differ.

	Partial payment	Deposit	Instalment schedule
Agreed in advance	No — the customer sends less than the invoice	Yes — a part payment before work starts	Yes — a total divided into dated amounts
Where it sits	Applied to the open invoice; the balance ages in AR	Customer prepayment or deferred revenue until earned	One invoice with several due dates, or one partial invoice per instalment
Typical amount	Whatever arrived	A fixed sum or percentage, often 50% (“half payment”)	The total divided evenly — $1,200 as 12 weekly payments of $100

A “half payment” is a deposit if it was agreed and a partial payment if it was not. Dividing a total into weekly instalments is a payment plan: raise a partial invoice for each instalment, or one invoice with a schedule, so every receipt has something to match against.

How a partial payment is applied to an invoice

A partial payment is applied through cash application: the receipt is matched to the invoice it belongs to, the amount received is posted against that invoice, and the invoice status changes from open to partially paid. The unpaid balance stays on the invoice and keeps ageing.

1. The payment lands in the bank with a reference, or a remittance advice arrives explaining it.
2. Cash application matches it to the invoice by reference, amount and customer.
3. The amount is applied; the invoice now shows amount billed, amount paid and balance due.
4. The balance moves through the AR ageing buckets until it is paid, credited or written off.

If a customer sends one payment against several invoices, the receipt is allocated by their remittance instruction, or oldest-first when there is none.

Short-pay vs partial payment

A short-pay is a partial payment with a deliberate deduction: the customer paid less because they disputed the price, returned goods, took an early-payment discount, or netted off a credit they believe they are owed. Partial payment is the wider category and also covers cash-flow part payments and plain errors.

The distinction decides the next action. A short-pay needs a decision — accept the deduction and raise a credit note, or reject it and rebill. A cash-flow partial needs a chase and, often, an agreed schedule for the rest. An error — a bank fee deducted in transit, an FX shortfall, the wrong invoice paid — needs a correction, not a dispute. What to do when the balance drags on: net 30 but paid in 90.

How a partial payment reconciles

A partial payment reconciles when the bank line is matched to the invoice at the amount received, not the amount billed, and the invoice is left open at the remaining balance. The failure mode is the opposite: a system marks the invoice paid on the first receipt, and the shortfall vanishes.

In the ledger the entry is a debit to bank and a credit to accounts receivable for the partial amount only. Payment reconciliation then confirms three things: the receipt exists in the bank, it is applied to the right invoice, and the open balance in AR equals what the customer still owes.

Fynex runs this step: every incoming payment is matched to its invoice, the shortfall is flagged the moment a payment comes up short, and the partial posts to Xero, QuickBooks or FreshBooks with the invoice left open at the right balance. See reconciliation and invoicing.