AI in bank reconciliation and the items it cannot decide

5 days ago
3 min read

Updated: 5 days ago

Introduction

Reconciliation is the monthly task that consumes a disproportionate share of a small business's administrative time and produces nothing visible when it goes well. Hundreds of transactions are matched against invoices and payments, most of them obviously, and a stubborn handful are not, and those consume most of the afternoon.

Automatic matching handles the obvious majority competently. What decides whether reconciliation stops being a burden is the treatment of the remainder: the part payments, the combined payments, the bank charges nobody expected, the transfer that appears twice. Those require judgement, and a process that assumes they will not occur simply relocates the problem.

1. AI in bank reconciliation clears the routine and leaves the judgement

Expect that division.

Exact matches on amount, date and reference are mechanical. Anything requiring an inference about what the customer intended is not, and designing for that split is what makes the process work. Assume around a tenth of transactions will need a person, and give that tenth a named owner and a weekly slot.

2. Reconcile weekly rather than monthly

The single biggest improvement.

An unexplained transaction is far easier to identify three days later than five weeks later. Weekly reconciliation takes less total time than monthly, because the recall is fresh and the volume per session is small. It also means a fraudulent or duplicated payment is found within days rather than after the next statement.

3. Fix the reference problem at source

Where most mismatches come from.

Customers who pay without a reference, pay several invoices in one transfer, or pay a rounded amount create most of the manual work. Clear payment instructions and a stated reference convention reduce the exception volume more than any matching improvement.

4. Handle part and combined payments as a rule, not a puzzle

They recur.

A defined policy — allocate to the oldest invoice, or hold as unallocated pending confirmation — applied consistently, is faster and more auditable than a fresh decision each time.

5. Investigate anything unexplained, however small

The discipline that catches problems.

Small unexplained debits are how fraud, duplicate subscriptions and incorrect charges present themselves. Writing off small differences to keep the reconciliation tidy is how they persist for years. Set a rule that nothing is written off without a stated reason, however trivial the amount.

6. Look for the recurring charges nobody authorised

A regular finding.

Subscriptions for services nobody uses, insurance renewals for cover no longer needed, and standing orders to former suppliers. A list of every recurring debit, reviewed annually, is one of the most productive hours available.

7. Keep a clear audit trail of every match

Not just the result.

Who matched what, when, and on what basis, particularly for anything manual. This matters for any external review, and it is what allows a mistake to be traced rather than argued about.

8. Do not let the software close the books

Reconciliation is a control, not a chore.

The point of reconciling is to confirm that the records reflect reality. A process that force-matches to achieve a clean result has defeated its own purpose, and a suspense account that only grows is a warning sign.

9. Watch the unmatched ageing

The health measure.

Number and value of unreconciled items, by age. This is the number that shows whether the process is under control, and it is more informative than whether the reconciliation was completed.

Confirm the record-keeping and retention requirements that apply to you before relying on any system's storage. Accounting record obligations differ by jurisdiction and by entity type, and they are not a software decision.

Conclusion

Expect the routine to be automated and design carefully for the remainder.

Reconcile weekly because unexplained items are identifiable while they are recent, fix the reference and payment instruction problem at source since it causes most mismatches, define a consistent policy for part and combined payments, investigate every unexplained item however small, review the full list of recurring debits annually, keep an audit trail of manual matches, never force a match to achieve a clean result, and report unmatched items by value and age.