Modelo F66 of Navarre: Declaración-liquidación mensual del IVA (grandes empresas y devolución mensual)

Who files it

All its deadlines

Each row is a deadline from the official calendar: the last day to file. When that day falls on a Saturday, Sunday or public holiday, the calendar already moves it to the next working day.

* Date worked out with the deadline rule, because the official calendar for that year has not been published yet. Check it when it comes out.

Every deadline of the year, month by month: the 2026 tax calendar for Navarre.

The same obligation with other tax authorities

What is declared here with form F66 goes on a different form, with different deadlines, at other tax authorities. Which one applies to you depends on where you are taxed, not on where you live.

Official links

Where it is filed, its instructions and, if there is one, the file format for importing it. All on the website of the Hacienda Foral de Navarra (Navarre’s own tax authority).

Frequently asked questions

Official sources

Where what this page says comes from, consulted on the review date. If something does not match, the source prevails.

1. 2026 tax calendar for Navarre Hacienda Foral de Navarra
2. 2026 tax calendar for Navarre Hacienda Foral de Navarra
3. Trámite F66 Hacienda Foral de Navarra

Keep reading

• NavarreThe 125 deadlines of 2026 in Navarre, month by month: the form, the period and the last day, copied from the official calendar. In .ics and .json.
• Filing lateWhat it costs to file a Hacienda form late or pay the Seguridad Social late: 1% per month, 15%, the €200 penalty and the 10% and 20% surcharges.
• Examples7 made-up profiles and the 2026 calendar that Mis Obligaciones’s rules give them: self-employed under direct assessment and under modules, companies, the Canary Islands, Bizkaia and Navarre.
• GlossaryWhat an autoliquidación, the 70% rule, REDEME, SII, IGIC, the Concierto Económico or RETA are, explained in two sentences with their official source.