In Finland, business payment terms over 30 days need express agreement. Late payment interest from 1 July to 31 December 2026 is 10.5% for B2B invoices.

Mandatory invoice details in Finland under the VAT Act: invoice number, Y-tunnus, VAT rate and taxable amount. Up to €400, simplified details are enough.

How to invoice in Finland in 2026: mandatory details, payment terms, 10.5% late interest, e-invoicing (verkkolasku) and the six-year retention rule.

When EU sales from Finland are VAT-free, what the invoice must say, when the EC sales list is due, and what the €100,000 EU SME scheme means.

VAT for a toiminimi in Finland: the €20,000 threshold, registering in OmaVero, tax periods, private use, and why VAT is never your money.

Which purchases are VAT-deductible in Finland and which are not: entertainment, cars, mixed use, and the invoice details that decide your deduction.

When is the Finnish VAT return due? Monthly, quarterly and annual deadlines, the 12th-day rule, the €100,000 and €30,000 limits, and late fees.

How to calculate Finnish VAT in 2026: multipliers for 25.5%, 13.5% and 10%, net from gross, the VAT share of a price and a monthly example.

When must you register for VAT in Finland? The €20,000 threshold, how it works mid-year, the two-year rule and how to register in OmaVero.