Supplier statement reconciliation compares a supplier's list of what they believe is outstanding against your own record for them. It is tedious, it is skipped more often than any other payables control, and it is the most reliable way to discover invoices they raised that you never received, credits never applied, and payments allocated against the wrong item.
Prioritise by document count
Reconcile monthly for the suppliers who send you the most invoices rather than those with the largest values, because errors accumulate per document. A rule based on volume concentrates the effort where the leaks are, and it makes the task finite rather than endless.
Categorise the differences before investigating
Invoices they list and you do not hold. Invoices you hold and they do not list. Credits they have applied and you have not, or the reverse. Payments allocated differently on each side. Sorting first turns a long list of discrepancies into four short ones.
Act on the pattern, not just the items
A supplier who repeatedly lists invoices you never received has an addressing problem worth fixing at source. One whose credits never appear has a process issue on their side. Resolving the individual items is the work; noticing the pattern is what stops it recurring.
Never pay from the statement itself
A statement carries no line detail to match against and may list invoices you have already paid or never received. Ask for the underlying invoices and process them normally through the same validation and matching as anything else. Paying from a statement is a reliable route to duplicate payment and it removes every verification step you have.
Questions people ask about supplier statement reconciliation
Why not just pay from the statement?
Because it carries no line detail to match against and may list invoices you have already paid or never received. Paying from a statement is a reliable route to duplicate payment.
How often is enough?
Monthly for your highest-volume suppliers and periodically for the rest. Annual reconciliation finds the same problems much later and much more expensively.
Can it be automated?
Partly, since it is a list-to-list comparison. Statement formats vary enough that a person usually adjudicates the differences, but the matching of obvious pairs can be assisted.