Base filing deadline
Employees / standard filers30 AprilVerified
In Thurgau, extension requests go through your commune's tax office, not a central cantonal portal — process and fee practice can vary from one commune to the next.
Extension
A request is required.
Request through your commune's tax office (Gemeindesteueramt), not a cantonal portal — Gemeindesteueramt
- Freeuntil 30 SeptemberVerified
- Freeuntil 30 NovemberVerified
- Freeuntil 31 DecemberPartially confirmed
Absolute maximum extension
30 NovemberVerified
If you miss it
- Formal noticeAmount not published — verify with your cantonal tax officeNot confirmed
The one deadline that's the same everywhere
A Pillar 3a contribution or pension-fund (BVG) buy-in counts for a tax year only if it's credited to your account by 31 December of that year — the date you initiate the payment doesn't count, only the date it lands.
Banks and 3a foundations often close their own booking cutoff a few days early (commonly ~24–27 December) so the payment posts in time — that's provider practice, not law, so don't wait until the 31st.
Sources & methodology
- View source →Last verified 2026-07-06
- When is the Thurgau tax return due?
- 30 April for employees / standard filers.
- Can I get a deadline extension in Thurgau?
- Yes — see the Extension section above for the exact process, cost, and channel.
- What happens if I miss the deadline in Thurgau?
- See the "If you miss it" section above for this canton's specific consequences.
- When's the deadline for a Pillar 3a contribution?
- 31 December, nationwide, for every canton — and the payment must be credited to your account by then, not just sent.