Segregation of duties in payables is often reduced to two people signing things, and it is more specific than that. Four distinct capabilities exist in the process, and the risk comes from particular combinations of them in one pair of hands. Knowing which combinations matter is more useful than a general rule, especially in a small team where perfect separation is impossible.
The four roles
Setting up or amending a supplier record, including bank details. Approving an invoice. Releasing a payment run. And reconciling the payables ledger or the bank. Each is legitimate on its own; the risk is in combinations, and the most dangerous single combination is supplier setup plus payment release, because it allows both the destination and the transfer to be controlled.
What to separate first in a small team
If you can only separate one thing, separate supplier bank details from payment release. That combination is the one that turns an error into a loss. Approval and reconciliation can often be shared with compensating review, and documenting that decision is better than pretending to a separation you do not have.
Compensating controls when separation is impossible
Small teams cannot always separate four roles across two people. The honest response is documented compensating controls: a monthly review of supplier record changes by somebody outside the process, a check of the payment run against approved invoices, and periodic statement reconciliation. Write down what you cannot separate and what you do instead.
Questions people ask about segregation of duties accounts payable
What if we only have two people in finance?
Separate supplier maintenance from payment release, and bring in somebody outside finance, often an owner or a director, for a periodic review. Document the arrangement.
Does software enforce segregation?
It makes it enforceable and testable through role configuration. It cannot create people, and it should not be configured to permit the risky combinations quietly.
How does absence affect this?
Cover arrangements are where segregation most often lapses. Decide in advance who covers what and make sure it does not recreate a risky combination.