No response from the Swiss tax office: what the silence means

Key takeaways

• After you file, the tax office issues an assessment decision (VeranlagungsverfügungVeranlagungsverfügungAssessment decisionFRdécision de taxationITdecisione di tassazioneThe canton's binding decision on what you owe, which may differ from what you filed. Receiving it starts your 30-day objection window.Where you see itArrives by post, often a year or more after you file.Open in the glossary →). That document is what matters, not the silence before it.
• You have 30 days from notification to file an objection (EinspracheEinspracheObjectionFRréclamationITreclamoA formal challenge to an assessment decision, due within 30 days of notification. Miss it and the assessment becomes final in almost all cases.Where you see itThe deadline is printed on the assessment decision itself.Open in the glossary →, the formal written objection). After that, the assessment is final.
• Silence decides nothing, and an assessment is not a certificate of correctness: it makes a flawed return official.
• The asymmetry runs against you. An underdeclaration stays collectable for about a decade, while anything you want corrected closes in 30 days.
• Waiting is not free. Interest runs from the general due date, and on federal tax an advance payment is credited at 0.0% from 2026.

What comes back after you file?

After you file, the tax office reviews your return and issues an assessment decision (Veranlagungsverfügung). This binding document states your taxable income, taxable wealth and tax due. Processing may take months or longer. An unanswered return does not tell you whether the office has accepted your figures.

When the assessment arrives, compare it with your return and documents. The office may not have identified an omitted deduction or another missing piece of information. A decision that matches your return still needs this check.

The clocks

Three clocks govern this, and they run for very different lengths of time. Only one of them is yours.

Clock	Who it belongs to	How long	Federal basis	Cantonal basis
Objection window (Einsprache)	You	30 days from notification	DBG Art. 132	StHG Art. 48
Right to assess you at all	The tax office	5 years after the tax period, restarting at every official step, 15 years at the outside	DBG Art. 120	StHG Art. 47
Supplementary-tax proceedings (Nachsteuer)	The tax office	Up to 10 years after the tax period (15-year absolute limit), plus interest	DBG Art. 151–152	StHG Art. 53

• Your clock: 30 days. From notification of the assessment, you have 30 days to file an objection (Einsprache, the formal written objection to an assessment). Spot a mistake inside that window, yours or theirs, and it can be fixed. After it, the assessment is final.
• Their clock: up to 10 years. If it later emerges that income or wealth was underdeclared, the office can open supplementary-tax proceedings (NachsteuerNachsteuerSupplementary taxFRrappel d'impôtITricupero d'impostaTax the canton can collect later when income or wealth was not declared, going back up to ten years after the tax period, plus interest.Where you see itOnly if the tax office opens proceedings. It is not part of a normal filing.Open in the glossary →, back tax on what an earlier assessment missed). The power to open those proceedings expires 10 years after the tax period, and the power to actually set the supplementary tax expires 15 years after it (DBGDBGThe federal income tax actFRLIFDBundesgesetz über die direkte Bundessteuer: the act that governs federal income tax for the whole country. Almost every federal rule a guide cites comes from here, which is why the abbreviation appears so often beside an article number.Where you see itIn citations, as DBG Art. 33 or similar. French and Italian sources call the same act LIFD.Open in the glossary → Art. 152). The tax comes with interest. Where negligence or intent is involved, penalties are added on top.
• The cantonal clocks are the same clocks, in all 26 cantons. Federal law fixes all three periods for cantonal and communal tax too, so your cantonal assessment and your federal assessment run on the same 30 days, the same five years and the same ten. What differs between cantons is how long they take in practice, not how long you have.

• 30 daysFor you to objectfrom notification of the assessment, DBG Art. 132
• 10 yearsFor the office to reopen underdeclared incomeafter the tax period, with a 15-year absolute limit, DBG Art. 152
• 5 yearsFor the office to assess you at allafter the tax period, 15 years at the outside, DBG Art. 120
• 2-3 yearsA common wait for a source-taxed filingwhat people report, not a legal period

An underdeclaration stays collectable for about a decade. Anything you want corrected closes in 30 days.

Why the asymmetry matters

The deadlines serve different purposes. The ordinary period for objecting to your assessment is 30 days. Proceedings to recover tax on undeclared income or wealth can remain possible for years under the rules above.

Once an assessment is final, a deduction you forgot to claim generally cannot be added simply because you later notice the omission. Missing income can still lead to additional tax and interest. Review the decision promptly instead of treating an absence of questions as confirmation that the return is correct.

What to check when the assessment arrives

When the assessment arrives, do not archive it unread. Compare three lines against your filed return.

1. Taxable income. Does it match what you filed? A difference means the office changed something; the accompanying notes say what.
2. Deductions. Were any reduced or struck? This is where you learn what the office did not accept, and what to document better next year.
3. Tax due versus what you paid provisionally. Check this so the final bill (or refund) is not a surprise.

If something is wrong in either direction, the Einsprache window is open for 30 days from notification.

How long is too long?

Silence is normal for far longer than most people expect, and the wait differs sharply by situation.

Your situation	What people typically report
Ordinary assessment, straightforward return	A few months to about a year
Source-taxed filing moving to an ordinary return	Two to three years is common
Anything with a query attached	Longer again

The outer bound is the law rather than practice: the right to assess you expires five years after the end of the tax period (DBG Art. 120; the same rule for cantonal tax is StHGStHGThe cantonal tax harmonisation actFRLHIDITLAIDSteuerharmonisierungsgesetz: the act that tells all 26 cantons which taxes they must levy and how the rules must be shaped. It sets the frame; each canton still fixes its own rates and many of its own deduction ceilings inside it.Where you see itIn citations as StHG Art. 13 or similar, usually beside the DBG article covering the same point federally.Open in the glossary → Art. 47). That five-year period is not a hard stop. It pauses while an objection or appeal is running, and it starts again from zero at every official step the office takes and tells you about. A query letter is enough. The one date that cannot move is the 15-year limit after the end of the tax period. So a long wait is usually lawful rather than a sign that something went wrong.

Waiting is not free, and it is not neutral. Interest accrues on the tax you will eventually owe from the general due date onward, so a slow assessment does not postpone the cost. Paying early no longer offsets it the way it used to: on direct federal tax the rate credited on a voluntary advance payment is 0.0% from 2026, down from 0.75% in 2025, while the rate charged on late payment is 4.0%. Cantons set their own rates and several still credit advance payments at a meaningful rate, so check your own canton's figure before deciding whether to pay ahead.

Common questions

Does no letter from the tax office mean my return was accepted?

No. Before the assessment decision arrives, nothing is decided. No response usually means the return has not been processed yet.

How long do I have to object to an assessment?

30 days from notification of the assessment (Einsprache, DBG Art. 132). After that, the assessment is final.

Sources

The sources below support the tax figures and rules discussed in this guide. Follow the links to check the original guidance and its scope.

1. DBG Art. 132 — Einsprache (objection), 30 days from notification — Fedlex, Swiss federal law — fedlex.admin.ch
2. DBG Art. 151 — ordentliche Nachsteuer (the supplementary tax itself, with interest) — fedlex.admin.ch
3. DBG Art. 152 — Verwirkung (the 10-year and 15-year limits on supplementary tax) — fedlex.admin.ch
4. DBG Art. 120 — Veranlagungsverjährung (the office's 5-year period to assess, 15 years at the outside) — fedlex.admin.ch
5. DBG Art. 150 — Berichtigung (correction of arithmetic and clerical errors, five years from notification) — fedlex.admin.ch
6. StHG Art. 47, 48 and 53 — the same periods, made binding on every canton — fedlex.admin.ch
7. Federal Constitution Art. 29 para. 1 — the right to have a case decided within a reasonable time, which is what an unjustified-delay challenge rests on — fedlex.admin.ch
8. ESTVESTVThe Federal Tax AdministrationFRAFCEidgenössische Steuerverwaltung: the federal tax authority. It publishes the forms, leaflets and price lists the cantons and your tax software work from, but it is not the office that assesses you: that is your canton.Where you see itNamed as the publisher on federal forms, leaflets and the Kursliste.Open in the glossary → — interest rates for federal taxes from 1 January 2026: 4.0% on late payment, 0.0% credited on voluntary advance payments of direct federal tax (2025: 4.5% and 0.75%) — efd.admin.ch