Transaction Posting

Transaction posting is the process by which a bank, credit union, e-money firm or wallet provider records a transaction against a customer's account, so that the account's ledger balance changes. A card purchase, salary credit, direct debit or transfer is only fully reflected in an account once it has been posted. Posting is carried out by the institution's core banking system, which applies debits and credits to the general ledger and to the customer's own sub-account.

Posting is distinct from authorisation and from settlement. Authorisation decides whether a payment may go ahead, settlement moves money between institutions, and posting records the result on the customer's account. The general accounting sense of posting applies, but in retail banking the term has particular practical consequences for available balances, overdraft fees and disputes.

Most banks post in two stages. A memo post is a provisional entry made as soon as the bank learns of a transaction, for example when it approves a card payment and places an authorization hold. The memo post reduces the available balance straight away but does not yet change the ledger balance. The final or hard post happens when the transaction clears, for a card payment when the merchant's clearing record arrives, often a day or more later. At that point the hold is replaced by the actual entry, which may be for a different amount, as with hotel bills, fuel purchases or tips.

The gap between the two explains common customer confusion. A transaction can appear as pending for several days, a hold can fall away while the final amount is still to come, and the ledger and available balances can differ. Card issuers' settlement lag and the length of authorisation validity both affect how long that gap lasts.

Traditional core systems post in a nightly batch: during the day they collect memo items, cheque presentments, ACH files and card clearing records, and in an overnight run they apply them all, calculate interest and fees and produce new balances for the next morning. Batch posting is efficient for high volumes but means balances are only final once a day.

Instant payment schemes such as Faster Payments, FedNow and Pix require funds to be credited to the payee within seconds, which has pushed banks towards real-time posting. Modern ledgers post each transaction as it arrives and keep a running balance at all times. Many institutions run a hybrid model, posting instant payments immediately while keeping batch processes for cheques, card clearing and interest.

When several debits arrive on the same day, the order in which they are posted can change whether an account goes overdrawn and how many fees are charged. Some US banks historically posted debits from largest to smallest, which tended to maximise overdraft fees, and this practice led to class actions and regulatory criticism; many banks have since switched to chronological or smallest-first ordering. Fair and clearly disclosed posting order remains a consumer protection issue, linked to overdraft fees.

Posting date and value date also differ. The posting date is when the entry appears on the account, while the value date is the date from which interest is calculated and funds are treated as available. In corporate banking the two can be several days apart, especially for cross-border and foreign currency payments, which matters for interest and liquidity planning. Treasurers therefore watch value dates closely when moving large sums between banks or currencies, and many cash management agreements specify the value dating rules that apply to each payment type.

Mistakes in posting, such as duplicates, wrong amounts or entries on the wrong account, are corrected by reversing entries rather than by deleting records, so the audit trail stays intact. Customers usually see these as a credit that cancels an earlier debit. Banks run daily account reconciliation between the customer ledgers, the general ledger and the settlement accounts held with clearing systems, so that every posted item is matched to a real movement of funds. For wallet and e-money providers, the same discipline links customer balances to the safeguarded funds held at banks, as described under wallet reconciliation.