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
If you are resident and domiciled in Ireland, returns from Nigerian Treasury bills and bonds are foreign income you must declare to Revenue, in the foreign income section of your return, and they are charged at your marginal rate. Revenue taxes non-EU deposit interest at the higher of the DIRT rate (33%) and your marginal rate. Above €5,000 of taxable non-PAYE income you must register for self-assessment and file Form 11.
Nigerian Treasury bills and FGN bonds often pay more in naira than Irish savings pay in euro, and many Nigerians in Ireland hold some. The Nigerian tax rules on them get a lot of attention. The Irish side gets less, but for an Irish resident it is the one that applies to the whole return. This is information, not advice: the position depends on your residence, your domicile and the instrument.
Why Ireland taxes it at all
Revenue says that if you are resident and domiciled in Ireland, you are taxable on your worldwide income. You are resident in a tax year if you spend 183 days or more in Ireland, or 280 days across that year and the previous one. Interest or discount earned in Nigeria is therefore Irish income, even if it never leaves your Nigerian account.
If you are resident but not domiciled in Ireland, which can be the case for someone whose permanent home remains Nigeria, different rules may apply to foreign income that is not brought into Ireland. See the remittance basis for Nigerians in Ireland and take advice before relying on it.
What rate applies
Revenue's page on foreign deposit interest (published 24 April 2026) sets out how interest from abroad is treated:
| Source of interest | Revenue's treatment | Notes |
|---|---|---|
| EU deposits | Generally taxed at the DIRT rate, 33% | Declared on Form 11 or in myAccount |
| Non-EU deposits, including Nigerian bank deposits | Higher of the DIRT rate and your marginal rate | Standard-rate taxpayers pay 33%; higher-rate taxpayers 40% |
| Nigerian T-bills and bonds | Not covered on that page | Foreign income charged at your marginal rate; ask Revenue to confirm the treatment of a discount |
The same page says USC does not apply to deposit interest whatever its source, and that PRSI may apply. A T-bill discount or a bond coupon is not a deposit, and Revenue's page does not say whether the USC exemption extends to them. Until you have confirmed the treatment, do not assume the deposit rules apply to securities.
How to declare it
- Revenue says you must register for self-assessment if your taxable non-PAYE income is over €5,000, or gross non-PAYE income over €30,000.
- Below those levels, declare it in myAccount through Form 12.
- Self-assessed taxpayers file Form 11 on ROS, in the foreign income section. File by the pay and file deadline Revenue publishes for each year.
- Convert each naira amount to euro using a consistent, documented rate for the date you received it, and keep the bank's confirmation.
Nigerian tax already deducted
Reuters reported in October 2025 that Nigeria would apply a 10% withholding tax to interest on short-term securities, which includes Treasury bills. Some FGN instruments are exempt from Nigerian tax, but a Nigerian exemption does not change the Irish position: for an Irish resident and domiciled investor, Ireland taxes the return.
Where Nigerian tax is withheld, relief in Ireland depends on whether there is a tax treaty. Revenue's treaty overview (18 February 2026) says Ireland has signed 78 treaties, 75 in effect, and does not mention Nigeria; we could not confirm an Ireland-Nigeria treaty in force. Revenue also has rules for unilateral relief where no treaty applies. See the Ireland-Nigeria tax treaty question and ask an adviser how any Nigerian tax is treated on your return.
A worked example
Example (illustration only): your 364-day bill pays a discount of ₦150,000, and on the maturity date that is worth €90 on the rate you document. If 10% Nigerian withholding tax applied, ₦15,000 (€9) was deducted. In Ireland, a higher-rate taxpayer charged at 40% would owe €36 on the €90 before any relief; a standard-rate taxpayer at 20% would owe €18. If relief for the Nigerian tax is allowed, it reduces the Irish bill; if not, you bear both. Real figures depend on the rates and your circumstances.
Currency movements
If the naira weakens between buying and maturity, your euro return can be smaller than the naira figures suggest, or even negative. Keep the euro value at purchase and at maturity in your records; whether a currency loss can be set against anything is a question for your adviser.
Records to keep
- Purchase confirmations showing face value, price paid and tenor.
- Maturity or coupon credits from your Nigerian bank or broker.
- Any certificate or line showing Nigerian tax withheld.
- The euro conversion rate and source for each amount.
- Copies of your Form 11 or Form 12 entries.
You may also need to tell Revenue about the Nigerian account itself; see reporting a Nigerian account to Revenue.
Where Pryme fits
Pryme does not give tax advice. A Pryme account can hold the naira proceeds and convert to euro with Swap when you choose, and you can generate a statement for your records with verifiable receipts and statements.
Questions people ask
Do I pay Irish tax on Nigerian T-bill interest?
If you are resident and domiciled in Ireland, yes. The return is foreign income declared to Revenue and charged at your marginal rate.
Which form do I use for foreign interest in Ireland?
Form 11 on ROS if you are self-assessed, or Form 12 in myAccount if your non-PAYE income is below Revenue's thresholds.
Is USC charged on Nigerian bond interest?
Revenue says USC does not apply to deposit interest. It does not say the same for bonds or T-bills, so confirm with Revenue.
Can I claim the Nigerian withholding tax in Ireland?
It depends on treaty and unilateral relief rules. We could not confirm an Ireland-Nigeria treaty in force, so ask an adviser.
Sources
- Revenue: Tax residence (24 Nov 2025) · accessed Oct 2026
- Revenue: Deposit interest, including foreign deposit interest (published 24 Apr 2026) · accessed Oct 2026
- Revenue: Who should register for Income Tax self-assessment (published 15 Oct 2026) · accessed Oct 2026
- Revenue: Double Taxation Treaties (18 Feb 2026) · accessed Oct 2026
- Revenue: Double taxation relief, unilateral relief (10 Mar 2020) · accessed Oct 2026
- Bizcommunity (Reuters): Nigeria to impose 10% withholding tax on interest on short-term securities (29 Oct 2025) · 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.