In 2026, the Nigeria Tax Act (NTA) 2025 has introduced strict rules for foreign currency transactions to prevent "tax leakage" through exchange rate manipulation. While you follow IAS 21 for your accounting books, the tax authorities require specific adjustments for your tax returns.
Here is the 2026 framework for handling foreign currency in your business:
1. The "Official Rate" Rule
Under Section 20(4) of the NTA 2025, you can only deduct expenses or record income in a foreign currency using the official Central Bank of Nigeria (CBN) exchange rate for that specific date.
- No Black Market Rates: You cannot use "parallel market" or "street" rates in your official tax records, even if that is where you sourced the funds.
- Evidence: You must maintain a log showing the date of the transaction and the corresponding CBN spot rate used for conversion.
2. Realized vs. Unrealized Gains/Losses
This is the most common area for errors. In 2026, the Nigeria Revenue Service (NRS) makes a sharp distinction:
| Transaction Type | Accounting Treatment (IAS 21) | Tax Treatment (NRS 2026) |
|---|---|---|
| Unrealized Gain/Loss (e.g., year-end revaluation of USD in your bank) | Recorded in the P&L as a gain or loss. | Ignored for Tax. You must add back unrealized losses or deduct unrealized gains when calculating tax. |
| Realized Gain/Loss (e.g., you actually sold USD to buy Naira) | Recorded in the P&L. | Taxable/Deductible. Gains are added to your income; losses are deductible if they pass the "Wholly and Exclusively" test. |
3. Capital vs. Revenue Transactions
In 2026, the purpose of the transaction changes how the forex difference is treated:
- Revenue Transactions (Trading): Gains/Losses from buying stock or paying for services are treated as part of your Company Income Tax (CIT) calculation.
- Capital Transactions (Assets): If you bought a machine in USD and its Naira value increased by the time you paid, that "loss" is not deductible from your profit. Instead, it is capitalized (added to the cost of the machine) and recovered through Capital Allowances.
4. New 2026 "Windfall" and Interest Taxes
- 10% Tax on Dollar Interest: If you hold USD in a Nigerian domiciliary account, banks are now required by the NTA 2025 to automatically withhold 10% tax on the interest earned.
- Windfall Tax: If you are a bank or a large financial institution, there is a 50% to 70% windfall tax on realized profits specifically from forex revaluation (this was a one-time measure extended into 2026).
5. Digital & Crypto Assets
If you are paid in Stablecoins (USDT/USDC):
- You must treat them as "Foreign Income."
- Convert the value to Naira using the CBN USD rate on the date of receipt.
- Capital Gains: Gains on the disposal of digital assets are now taxed at 30% (aligned with CIT) rather than the old 10% rate, to prevent tax arbitrage.
Checklist for your 2026 Records:
- Date of Receipt: The exchange rate must be the rate on the day the money hit your account, not the day you withdrew it.
- Conversion Log: Keep a spreadsheet with columns for: Date | Currency | Amount | CBN Rate | Naira Value.
WHT in Foreign Currency: If you pay a foreign vendor, you must pay the Withholding Tax (WHT) in that same foreign currency (or the Naira equivalent at the payment date).