AI agents for business finance: what they can and can't do
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The short answer
There is no right day to convert naira, because nobody can predict the rate. What you can control is how long you are exposed: converting soon after payment fixes your pound value, while holding naira only makes sense if you have naira costs to pay. For UK tax, the fee is recorded at the rate when the income arose, and any later gain or loss on naira you hold as part of the business generally falls within your trading profit.
A Nigerian client pays you ₦3 million. Do you convert today, wait for a better rate, or keep it in naira? Freelancers ask this every month, and the answer is less about forecasting and more about deciding how much risk you want to carry. This guide sets out the options, the tax treatment, and a simple policy you can follow.
Two separate questions
It helps to split the decision in two:
- The tax record: what pound value goes into your books for the fee. This is fixed by the date the income arose and a rate you can support, whatever you do with the naira afterwards.
- The money decision: when you actually exchange naira for pounds. This determines what you end up with in your UK account.
HMRC's Business Income Manual (BIM39510) says foreign-currency transactions are recorded at the spot rate on the date they are recognised, or at an average rate if rates do not fluctuate significantly in the period. Monetary items still held at the end of your accounting period are retranslated at the closing rate, and differences generally go to profit or loss. When rates move a lot, an average rate is harder to justify, so many freelancers with naira income use the rate on each payment date.
What a delay can cost or earn
Example only, with illustrative rates that are not real or current. Bisi invoices ₦3,000,000 and is paid when the illustrative rate is ₦2,000 to £1.
| Scenario (example) | Rate used | Pounds |
|---|---|---|
| Convert on the payment day | ₦2,000 = £1 | £1,500.00 |
| Wait 30 days, naira weakens | ₦2,100 = £1 | £1,428.57 |
| Wait 30 days, naira strengthens | ₦1,900 = £1 | £1,578.95 |
| Convert half now, half in 30 days (weaker case) | ₦2,000 then ₦2,100 | £750.00 + £714.29 = £1,464.29 |
The arithmetic: ₦3,000,000 / 2,000 = £1,500; / 2,100 = £1,428.57; / 1,900 = £1,578.95. Waiting turned a £1,500 fee into anything from about £1,429 to £1,579 in this example. The fee you earned did not change; only your exposure did.
How HMRC treats the difference
BIM39545 says that where holding foreign currency is an integral part of the trade, exchange differences are within the charge to tax on trade profits, while currency held as an investment or for speculation produces gains and losses that are not trading income. For a freelancer who is paid in naira and converts it in the ordinary course of business, the difference between the rate when you earned the fee and the rate when you converted is generally part of your business profit or loss. If you deliberately hold naira for months hoping for a better rate, that starts to look like an investment decision, which is treated differently. Our guide to when the naira falls before a client pays covers losses in more detail. This is general information, not tax advice.
Options, side by side
| Approach | Good for | Downside |
|---|---|---|
| Convert on receipt | Certainty; matching your UK costs | You take whatever rate the day gives |
| Convert in stages | Smoothing out large single payments | Partial exposure for the period |
| Hold naira for naira costs | Family support, Nigerian staff or suppliers | Pound value of the balance moves |
| Invoice in pounds instead | Moving the risk to the client | Client may push back or delay |
| Hold and wait for a better rate | Nothing reliable | Speculation, and a different tax picture |
If naira payments are regular, invoicing in pounds or including a rate clause may serve you better than any timing rule; see our guide to invoice currency for Nigerian clients.
If you send money home anyway
Many diaspora freelancers support family in Nigeria every month. If you would otherwise convert pounds back into naira to send home, keeping that share of a naira fee in naira avoids paying an exchange margin twice: once out of naira, once back in. Treat that share as a separate decision from the rest of the fee, and record the pound value of the whole fee at the rate when it was paid, as your books still need it.
A simple policy
- Decide your rule before the money arrives, for example: convert everything within two working days, except a set amount kept for naira costs.
- Write down the rate and the time of each conversion.
- Compare the rate you are offered with the mid-market rate on the day, so you know the margin you paid. Our guide to checking the real exchange rate explains how.
- Review the rule each quarter, not each day.
Where Pryme fits
A Pryme Business Account holds naira and pounds in the same account, so you can receive in naira, keep what you need for Nigerian costs and convert the rest when your rule says to. The app shows the rate and the fee before you approve, and each conversion is recorded with its rate for your books.
Questions people ask
Should I convert naira to pounds immediately?
Converting soon after payment fixes the pound value of your fee. Holding naira only makes sense if you have naira costs; waiting for a better rate is speculation.
Which exchange rate does HMRC want for naira income?
HMRC's BIM39510 describes using the spot rate at the transaction date, or an average rate if rates do not fluctuate significantly in the period.
If the naira falls before I convert, can I claim the loss?
Where holding the currency is integral to your trade, HMRC's BIM39545 says exchange differences are within trade profits. Currency held as an investment is treated differently.
Is it better to invoice Nigerian clients in pounds?
It moves the exchange risk to the client. Whether a client accepts it depends on the relationship and their access to pounds.
Sources
- HMRC Business Income Manual BIM39510: exchange rate for accounts purposes (updated 4 Aug 2026) · accessed Oct 2026
- HMRC Business Income Manual BIM39545: monetary assets (updated 3 Jul 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.