An adjustment is a correction the provider posts to a merchant's balance after a transaction has already settled, adding or removing money the original settlement got wrong or could not yet know about. The working adjustment definition is deliberately broad, because providers use the same label for fees, disputes, currency true-ups and their own mistakes. The customer never sees it: undoing a payment in front of the customer is a reversal instead.
Adjustment meaning in a settlement file
The sales dashboard and the bank credit almost never match, and adjustments are usually the reason. Take a merchant expecting 10,000 EUR two days after a strong trading day, who receives 9,540 EUR. The settlement file explains it: 280 EUR of processing fees, a 150 EUR chargeback debit from a sale made six weeks earlier, and a 30 EUR interchange downgrade on transactions submitted without full card data.
None of that appears in the sales report. Matching every line back to a source transaction ID is the whole of balance reconciliation.
The entries you will actually see
Dispute debits and credits are the most frequent, with funds pulled when a case is filed and returned if the merchant wins it. Fee adjustments correct downgrades, scheme assessments and misapplied pricing. Currency adjustments true up a converted amount once the final rate is known. Reserve movements push money into a reserve account and release it on schedule. Providers also post manual corrections for their own errors: a duplicated batch, a misrouted refund, a settlement sent to the wrong account.
Adjustments that land months after the sale
An adjustment belongs to the period it is posted in, not the period that caused it. A dispute lost in March against a January sale reduces the March payout. Accrual accounting has to carry that exposure forward, which means finance needs an estimate of the unresolved tail rather than a clean monthly close.
Why buyers of a payment business look at the tail
When a licensed payment business changes hands, unposted adjustments are a real liability sitting outside the balance sheet. Disputes filed but not decided, reserves not yet released, fee corrections still queued: each will settle against whoever owns the merchant portfolio when the entry lands. Buyers price that tail or push it into an escrow arrangement, and sellers who cannot quantify it lose the argument.
When an entry cannot be explained
Treat an unmatched adjustment as an open item, not a rounding difference. The useful question is never what is adjustment in general, but which transaction this particular entry belongs to. Ask the provider for the source transaction reference and the fee code behind it, and keep the item open until both arrive. A recurring pattern is rarely a mystery: persistent downgrades usually trace to missing data in how transactions are submitted, and fixing the submission removes the entry for good.