Is separation of duties required for small businesses?

Usually not by law, but it's one of the most effective protections against mistakes and fraud, and auditors, lenders and investors look for it.

Which frauds does it help prevent?

Changed vendor bank details and fake or duplicate invoices are common schemes. A second person on payments, and bank-detail changes verified by phone, guard against both.

Separation of duties for small finance teams: a practical guide

5 min readUpdated September 29, 2026By the thruflow team

The short answer

Separation of duties means no single person can both start and finish a financial transaction: whoever enters a bill shouldn't also approve it, and whoever approves it shouldn't also pay it. In a small team, the practical minimum is two people on every decision that moves money, and an audit trail that records who did what.

The duties to keep apart

Recording: entering orders, invoices and vendor bills.
Approving: agreeing that a bill should be paid or an order invoiced.
Paying and posting: sending money, or posting to the books.
Changing master data: especially a vendor's bank details.
Reconciling: checking the books against the bank.

Controls for a team of two or three

Maker and checker on every bill: one person enters it, another approves it.
Whoever approves a bill doesn't also pay it.
Changes to a vendor's bank details are confirmed by phone, on a number you already had, before any payment goes out.
Posting to the books is a deliberate step, separate from entering.
Someone other than the bookkeeper reviews a report of changes and payments every week.
Everyone signs in with two-step verification.

When one person has to do it all

Sometimes there is only one person. Then the controls move to after the fact:

The owner or an outside accountant reviews payments and changes regularly.
The system keeps an audit trail that can't be edited.
The bank sends alerts for new payees and large payments.
Bank accounts are reconciled every month.

Let the system enforce it

Rules that depend on people remembering them get skipped on a busy day. Software that blocks the same person from entering and approving, and records every exception, keeps the control working without anyone having to police it.

How thruflow does it

thruflow enforces separation of duties with built-in rules: whoever enters work can't approve it, and whoever approves a bill can't pay it. A relaxed mode lets very small teams approve their own work, with every self-approval recorded, and every action lands in a hash-chained audit trail.

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Questions

Is separation of duties required for small businesses?: Usually not by law, but it's one of the most effective protections against mistakes and fraud, and auditors, lenders and investors look for it.
Which frauds does it help prevent?: Changed vendor bank details and fake or duplicate invoices are common schemes. A second person on payments, and bank-detail changes verified by phone, guard against both.