How to Record Partial Payments on an Invoice

What is a partial payment?

A partial payment is any amount received that is less than the invoice’s outstanding balance. It may be a deposit, scheduled instalment, progress payment or simply part of an overdue amount.

Partial payment does not reduce the original value of the goods or services. It reduces only the amount still owed.

1. Confirm the payment

Check that the funds were actually received before recording them. Match the transaction to the correct customer and invoice using the M-Pesa code, bank reference, receipt number or another reliable identifier.

2. Open the original invoice

Record the payment against the invoice that requested it. Do not create a second invoice for the same sale simply because the customer paid in instalments.

3. Enter the payment details

Record the amount, payment date, method and reference. Add a short note when useful—for example, “50% project deposit” or “Second instalment.” The reference helps resolve questions later.

4. Recalculate the balance due

Subtract all valid, non-reversed payments from the invoice total. Never subtract a payment twice, and do not change the line-item prices to imitate a payment.

5. Update the invoice status

Use a status such as Partially paid while money remains outstanding. Mark the invoice Paid only when valid payments equal the total. If the due date passes with a balance remaining, it may also need overdue follow-up.

6. Issue a payment receipt

Give the customer a receipt for each confirmed payment. The receipt should identify the customer, invoice number, amount received, date, method, transaction reference and remaining balance.

7. Keep the payment history visible

A clear invoice or statement should show each credit separately. This gives both parties a simple trail from the original amount to the present balance.

What if a payment was entered incorrectly?

Preserve the audit trail. Reverse the incorrect credit and record the corrected payment rather than silently changing history. Add a reason such as “wrong invoice,” “duplicate entry” or “incorrect amount.” If money was actually refunded, record the refund through the appropriate accounting and payment process as well.

What if the customer overpays?

Do not show a negative balance without explaining it. Confirm whether the extra amount should be refunded or held as customer credit for a future transaction, and document the decision clearly.

Partial-payment checklist

• Funds confirmed as received
• Correct customer and invoice selected
• Amount and date entered accurately
• Payment method and reference captured
• New balance checked
• Receipt issued
• Incorrect entries reversed with a reason