AI agents for business finance: what they can and can't do
What AI agents can do in bookkeeping, close, collections and compliance today, where a person must stay in charge, and how to judge a product.
The short answer
Run a Lagos office's spending from South Africa with three things: a written policy that says what can be bought, up to what amount and with what proof; a small naira float topped up only against reconciled receipts; and approvals done digitally by a named manager, with anything above a set limit escalated to South Africa. Pay in naira, keep receipts that show the supplier and amount, and reconcile monthly before the next top-up.
A small Lagos office spends money every day on diesel, data, transport, office supplies and the occasional emergency repair. When finance sits in Johannesburg or Cape Town, the risk is either a float nobody can account for or a process so slow that staff pay out of pocket and stop claiming. The aim is a system that is quick in Lagos and checkable from South Africa.
Write the policy first
A one-page policy prevents most disputes. It should cover:
- What petty cash and expense claims may be used for, and what needs a purchase order instead.
- A per-item limit for petty cash and a monthly limit for the float.
- Who holds the float, who approves claims and who reviews them in South Africa.
- What counts as a valid receipt (see below).
- Deadlines: claims within a set number of days, reconciliation by a fixed date each month.
- What is never allowed: splitting a purchase to stay under a limit, paying personal costs, cash advances without approval.
Pay and price in naira
Spending in Nigeria should be in naira. The CBN's Foreign Exchange Manual 2026, as reported by TheCable (3 June 2026), states that the naira is the legal tender for transactions in Nigeria and that domestic transactions between Nigerian entities are priced and settled in naira, with limited exemptions. Fund the float in naira and keep the ledger in naira; convert to rand only in the South African books (see setting up a naira ledger).
A sample float and claim flow
- South Africa funds a naira float, for example ₦500,000, into an account controlled by the office manager.
- Staff spend from the float or pay and claim, attaching a receipt for each item.
- The office manager approves claims up to the per-item limit; above it, a South African manager approves before purchase.
- At month end the office manager submits the reconciliation: opening float, receipts, closing balance.
- South Africa checks the reconciliation and tops the float back up by the amount receipted, not by a round number.
Worked example (illustrative)
| Item | Amount |
|---|---|
| Opening float | ₦500,000 |
| Diesel (3 receipts) | (₦210,000) |
| Office supplies (2 receipts) | (₦45,000) |
| Staff transport (6 receipts) | (₦60,000) |
| Closing balance counted | ₦185,000 |
| Top-up to restore float | ₦315,000 |
₦210,000 + ₦45,000 + ₦60,000 = ₦315,000 spent, leaving ₦185,000; topping up ₦315,000 restores ₦500,000. If the count does not match the receipts, the gap is investigated before any top-up. Amounts are examples.
What counts as a receipt
Ask for receipts showing the supplier's name, date, description, amount and how it was paid. For transfers, the transfer receipt alone shows that money moved, not what it bought; pair it with the supplier's invoice. For more, see how to run petty cash in a Nigerian business.
Tax points to watch
- Benefits in kind. Under the Nigeria Tax Act 2025's Twelfth Schedule, as summarised by Streamsowers & Köhn, benefits in kind are taxable where the employer incurs expenses on an employee's behalf. Paying a staff member's personal costs from the float can create a taxable benefit.
- Withholding tax. If the Nigerian entity pays a contractor for services, Nigeria's 2024 withholding tax regulations (PwC summary) require deduction at source and a receipt to the payee; petty cash is not a way around that.
- Bank charges. The NRS has said VAT applies to bank charges, not to the amount transferred; record charges separately.
When the office outgrows petty cash
Petty cash suits small, frequent purchases. Once the same supplier is paid every week, such as a diesel vendor or a cleaning company, move it to invoice and transfer, with a purchase order and the normal approval chain. Larger or recurring costs paid in cash are hard to evidence and harder to audit. A useful test: if a single category takes more than half the float each month, it belongs in the supplier payment run rather than the cash box. Review the categories every quarter and adjust the float down as payments move to transfer.
Controls from South Africa
- Two people in Lagos for any cash count, and a surprise count each quarter.
- Monthly review of the reconciliation by someone outside the office.
- Digital approvals with a log, so the approval date sits next to the receipt.
- Rotate the float holder if the office is large enough.
See also approval rules for payments to Nigeria and cash flow planning across rand and naira.
Where Pryme fits
A Pryme Business Account holds naira for the office, and any customer can generate a verifiable receipt through VerifyDoc.ai that South Africa can check is genuine and unaltered. The Finance agent prepares the monthly reconciliation for a person to approve.
Questions people ask
How much petty cash should a small Lagos office keep?
Enough for about a month of small items, set in the policy and topped up only against receipts. The right figure depends on your costs.
Can we reimburse Lagos staff in rand?
Spending in Nigeria should be in naira; the CBN's 2026 FX manual says the naira is legal tender for transactions in Nigeria. Reimburse in naira.
Is a transfer receipt enough for an expense claim?
It proves payment, not what was bought. Pair it with the supplier's invoice or receipt.
Can paying staff costs from petty cash create tax?
Yes. Benefits in kind are taxable in Nigeria where the employer incurs expenses on an employee's behalf.
Sources
- TheCable: CBN FX Manual 2026 (3 Jun 2026) · accessed Oct 2026
- Mondaq (Streamsowers & Köhn): Taxation of employment income under the Nigerian tax reform Acts (11 Mar 2026) · accessed Oct 2026
- PwC Nigeria: Highlights of the Deduction at Source (Withholding) Regulations 2024 · accessed Oct 2026
- Daily Trust via AllAfrica: NRS on VAT on bank charges (21 Jan 2026) · accessed Oct 2026
This article is general information, not financial, legal or tax advice. Products described are provided under the terms on this site and are subject to regulation and eligibility.