Account Management
How to Calculate a Customer Account Balance
Learn the debit-credit logic behind customer and supplier balances, with a simple example and common control mistakes.
An account balance is the net result of recorded debit and credit movements for a customer or supplier. The meaning of the result depends on the accounting perspective and the type of counterparty.
Debit and credit logic
For a customer account, an issued sales invoice generally increases the amount receivable, while a collection reduces it. Returns, discounts and corrections must follow consistent movement rules.
A simple example
If a customer is invoiced 10,000 and later pays 6,000, the open receivable is 4,000 before any additional returns, offsets or corrections.
Balance must match movement history
A displayed total is only trustworthy when users can trace it to dated documents and payments. Manual balance overrides hide errors instead of resolving them.
Common calculation mistakes
Typical errors include reversing debit and credit direction, recording a payment twice, applying a collection to the wrong customer or excluding a return document.
Controls that improve reliability
Use unique document references, reconciliation, locked periods where appropriate, correction history and regular confirmation of unmatched movements.
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