Calculate your quarterly VAT return instantly. Enter your sales and expenses, the calculator tells you how much to pay the tax authorities or offset. Free, no registration required, updated for 2026.
Select the quarter you are filing
VAT you collected from customers on your sales invoices
Tax base of your invoices with standard VAT
Tax base of your invoices with reduced VAT
Tax base of your invoices with super-reduced VAT
VAT you paid on your deductible expense invoices
Tax base of your expenses with standard VAT
Tax base of your expenses with reduced VAT
Tax base of your expenses with super-reduced VAT
Equipment, machinery or other assets (21% VAT)
Negative balance from previous quarters to offset
Enter your sales or expenses to calculate Form 303
Form 303 is the quarterly VAT self-assessment. Follow these steps to calculate it:
Group the tax bases of your issued invoices by VAT rate: 21%, 10%, or 4%.
Group the bases of your expense invoices. Only include expenses related to your economic activity.
If you purchased equipment or machinery, add the input VAT as an additional deduction.
If you have negative balances from previous quarters, you can offset them to reduce what you pay.
Understanding these concepts is essential for correctly filing your VAT return:
This is the VAT you charge customers on sales invoices. It corresponds to boxes 01-09 of the form.
This is the VAT you pay on business expenses. It's only deductible if the invoice is in your name and linked to your business.
Output VAT - Input VAT = Result. If positive, you pay. If negative, you offset or request a refund.
If a quarter results in negative, you can carry forward that balance to reduce what you pay in subsequent quarters.
Form 303 is filed quarterly. These are the deadlines for 2026: