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
Individuals and sole traders apply to HMRC for a certificate of residence through the GOV.UK online service (or an emailable form that needs no sign-in), naming the UK–Nigeria double taxation agreement, the type of income, the treaty article and the period. HMRC issues it only if you are UK resident and entitled to the treaty's benefits, and it is Nigeria, not HMRC, that decides whether to reduce the tax it deducts.
A certificate of residence is HMRC's written confirmation that you are resident in the UK for the purposes of a particular tax treaty. Nigerian payers and their advisers use it as the evidence behind any treaty-based reduction in withholding tax. Without it, a finance team in Lagos or Abuja has little reason to depart from the domestic rate.
Who can apply
GOV.UK says you can apply if you are classed as UK resident and there is a double taxation agreement with the other country. The UK and Nigeria signed theirs in London on 9 June 1987, so that test is met for Nigeria. HMRC will not issue a certificate if you are not entitled to treaty benefits under the agreement, so a person who is resident in both countries, or whose Nigerian work runs through a fixed base in Nigeria, should check their position before applying.
How to apply, by type of business
| You are | Route on GOV.UK |
|---|---|
| An individual or sole trader | Online service (sign in, or create sign-in details), or an email form with no sign-in |
| An agent for an individual | Online, with agent services Government Gateway details |
| A limited company | RES1 online service (Local Compliance or Large Business) |
| A partnership | RES1, or post to Pay As You Earn and Self Assessment, HMRC, BX9 1AS |
What HMRC asks you to state
- Why you need the certificate (for example, a Nigerian client deducting WHT).
- The double taxation agreement: the UK–Nigeria convention.
- The income type and the treaty article you rely on.
- The period it should cover, if different from the issue date.
- Confirmation of beneficial ownership and UK tax liability, where the agreement requires it.
- If no Self Assessment return has been filed for a period from 6 April 2013: days in the UK, arrival or departure dates, and Statutory Residence Test details.
Choosing the article
Getting the article right matters, because it tells Nigeria which rule you are relying on. In the 1987 convention, Article 7 covers business profits (taxable only where you are resident unless you have a permanent establishment in the other country); Article 14 covers independent personal services such as professional, literary, artistic and teaching work, taxable only in your residence country unless you have a fixed base regularly available in the other; Article 12 limits tax on royalties at source to 12.5% of the gross; and Article 17 lets the country where an entertainer performs tax the performance income. A consultant would usually point to Article 14 or 7, a songwriter to Article 12, a DJ to Article 17. Our Nigeria library summarises what the treaty covers.
If Nigeria has its own form
GOV.UK says that where the other country provides its own residence form, you send that form to HMRC to certify, and individuals post it to the address above. If your client's adviser asks for a specific Nigerian template, send that rather than relying on the standard certificate.
What the certificate does and does not do
GOV.UK is explicit that the overseas authority decides whether foreign tax relief is granted. The certificate is evidence, not a refund. It does not stop a payer deducting tax, and the page gives no processing time or fee. Apply well before a large invoice is paid, and keep a copy for each tax year: a payer will often want one that covers the year of payment.
Worked example
Example only. A London illustrator licenses artwork to a Nigerian publisher for a £1,500 royalty. She applies for a certificate under Article 12. The publisher's WHT on royalties to an individual is 5% under the 2024 Regulations, per PwC's summary, which is £75 and already below the 12.5% treaty cap, so the certificate does not change the deduction. It still helps: HMRC limits foreign tax credit to the lower of the foreign tax paid (or the treaty rate) and the UK tax on the same income, as HS263 explains, so a clean record of the £75 makes the credit simple.
Steps
- Confirm you are UK resident for the tax year and have no Nigerian fixed base.
- Pick the treaty article that fits the income.
- Apply online on GOV.UK, or by the email form.
- Send the certificate, or the certified Nigerian form, to the payer before payment.
- Keep the WHT receipt and claim credit on your Self Assessment return.
If you trade through a limited company
When your Nigerian client pays your UK company rather than you, the company is the taxpayer, so the company applies for the certificate through the RES1 service and the invoice, contract and WHT receipt should all name the company. A certificate in your personal name will not support a deduction on a payment made to the company.
Where Pryme fits
Keep the certificate, the WHT receipt and the bank record of the net payment together. With Pryme you can generate a regular or verifiable statement for any payment, through our partnership with VerifyDoc.ai, which an adviser can check is unaltered (receipts and statements). For the deduction itself see the paperwork Nigerian payers want and claiming the credit in the UK.
Questions people ask
How long does HMRC take to issue a certificate of residence?
The GOV.UK page does not give a processing time. Apply before you need it.
Is there a fee for a UK certificate of residence?
The GOV.UK guidance does not mention a fee.
Can I get one if I moved to the UK this year?
Possibly. If you have not filed a return for the period, HMRC asks for UK days, arrival dates and Statutory Residence Test details.
Does the certificate force my Nigerian client to cut WHT?
No. It is evidence of UK residence. The Nigerian payer and tax authority decide what relief applies.
Sources
- GOV.UK: How to apply for a certificate of residence to claim tax relief abroad (last updated 26 Jun 2024) · accessed Oct 2026
- UK–Nigeria Double Taxation Convention 1987 (GOV.UK PDF) · accessed Oct 2026
- HMRC: Relief for foreign tax paid 2026 (HS263, updated 6 Apr 2026) · accessed Oct 2026
- PwC Nigeria: highlights of the Deduction of Tax at Source (Withholding) Regulations 2024 · 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.