Nigeria Tax Administration Act, 2025 · s.39
Which currency the tax is in
Tax is assessed in the currency of the transaction, and paid in that currency.
Who this lands on: Anyone invoicing or being paid in dollars, pounds or euro.
Tax is assessed in the currency of the transaction. Tax assessed in a currency other than the naira is paid in that currency.
So a dollar sale is a dollar matter for assessment, even though your books also carry the naira value at the rate on the day.
BizBrada keeps both: the original amount in the currency you traded in, and the naira value frozen at the rate you used. Nothing is silently reconverted later.