Without advance payments, your tax is due in one lump sum the following year, a few months after filing your tax return. It is therefore strongly recommended to make payments throughout the year to spread the burden. And if you operate through a company, it also helps you avoid a surcharge. Find all the rules and 2026 deadlines based on your situation.
Where to find the amount to pay in the BILLY app?
Your BILLY accountant calculates the amounts to pay on your behalf. You can find all the details in the app, under Taxes > Estimated tax: amount to pay, bank account details and structured communication, as well as a QR code to make payment easier.
The two key periods of the year for advance payments with BILLY
In February and March: preparation of a forecast (estimate of the year's income and expenses) and calculation of the corresponding tax, with a quarterly alert in the app to remind you to make your payments on time.
In November and December: update of the estimate based on actual figures, with a proposal for a final adjusted payment before 20 December.
I forgot to make the last advance payment of the year
If you are self-employed as a natural person, no stress — a 5th deadline is now available until 20 February of the following year. For company directors and companies, this additional deadline will only come into effect from the 2027 income year onwards.
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