LATAM context
The ITF applies to transactions on Peruvian accounts: debits, credits and transfers. It's a small tax per transaction but adds up in volume. SUNAT receives it directly, with no filing required from the taxpayer.
Concrete example
A 10,000 PEN transfer generates 0.50 PEN of withheld ITF, deducted automatically and reported to SUNAT.
How it shows up on your bank statement
The ITF appears as its own line right after the transaction that triggered it, for a few cents. Because there are so many small lines, it's the most common reason a balance doesn't add up when someone reconciles by summing only the 'big' transactions.
How does finO$ handle this?
finO$ separates the gross amount from the withheld ITF on Peruvian statements, so your books correctly reflect both the net and the tax.