The Zurich provisional tax bill: what it is and whether you must pay it

Key takeaways

• A bill arrives before anyone has assessed you. It is an estimate, usually based on your last assessment.
• Cantonal and municipal tax in Zurich has a general due date (VerfalltagVerfalltagGeneral due dateFRéchéance généraleThe date cantonal and municipal tax formally falls due — 30 September in Zurich, inside the tax year itself. Interest runs from it in both directions, whatever the date printed on your provisional bill.Where you see itNamed on the provisional invoice and on the final bill.Open in the glossary →) of 30 September of the tax year itself. That date drives the interest, not the date printed on the invoice.
• Paying the exact amount is not compulsory. Paying something by the due date effectively is, because interest runs from it either way.
• If you moved to Zurich during the tax year and got no provisional bill by 30 June, interest against you does not start until 1 January of the following year. Newcomers are the people most often frightened by this bill and the ones it charges last.
• You can change the amount. If your income dropped, or rose, tell the tax office and ask for a revised estimate.
• Overpay and the canton credits you interest. Underpay and it charges you. Both are settled in the final bill. For 2026 both rates are 0.75%, down from 1% in 2025.

This is one of the least explained parts of Swiss tax for newcomers: a bill for a year nobody has assessed yet, with no obvious way to tell whether it is a demand or a suggestion.

Why you get a bill before you are assessed

Swiss tax is assessed long after the year ends. In Zurich that is often a year or more, and for source-taxed cases frequently two to three years. The canton does not wait that long to collect.

So it estimates. Early in the year it sends a provisional invoice, sometimes called a payment recommendation (Zahlungsempfehlung) or provisional bill (provisorische RechnungProvisorische RechnungProvisional tax invoiceFRbordereau provisoireITconteggio fiscale provvisorioA bill sent before anyone has assessed you, estimated from your last assessment. The amount is an estimate you can ask to change; the due date behind it is real.Where you see itSent by your municipal tax office early in the year.Open in the glossary →), based on the most recent information it has. That is usually your last assessment, or the return you have just filed.

The estimate has nothing to do with your actual liability for that year. That is settled much later in the final bill (SchlussrechnungSchlussrechnungFinal billFRdécompte finalITconteggio finaleThe bill that follows the assessment decision. It nets what you owe against provisional payments already made and any tax withheld at source.Where you see itSent with or shortly after the assessment decision.Open in the glossary →), which nets everything you have already paid against what you turn out to owe.

1. 1Early in the yearA provisional invoice arrives, estimated from your last assessment; nobody has assessed this year yet
2. 2Any time before the due dateYou can ask the municipal tax office for a revised estimate if your income changed
3. 330 SeptemberThe general due date (Verfalltag). Paid early earns interest; still owing charges it
4. 4Months or years laterThe assessment decides what you actually owe
5. 5The final billNets everything you have paid against it, with interest credited or charged

The amount is an estimate you may pay differently. The date is not, and it drives the interest either way.

Is paying it compulsory?

The honest answer has two halves, and the forum answer of "they are just suggestions" is only half right.

The specific amount is an estimate, not a determination. You are not obliged to pay exactly what the provisional invoice says, and paying a different amount is not a breach of anything.

The due date is real. Cantonal and municipal tax in Zurich carries a general due date (Verfalltag, the date the tax formally falls due) of 30 September of the tax year itself, fixed by § 49 of the cantonal tax ordinance (Verordnung zum Steuergesetz). Interest attaches to that date. From it, what you have not paid begins to attract interest. That is true even though nobody has assessed you yet.

So the useful framing is not "must I pay this bill?" but "what will it cost me not to?" Paying nothing is a decision with a price, and the price is the interest rate the canton sets each year.

How interest works, in both directions

This is where the system is fairer to the taxpayer than people expect.

What you did	What happens	What Zurich calls it
Paid before 30 September	The canton credits you interest on what you paid early	VergütungszinsVergütungszinsCredit interestFRintérêt rémunératoireWhat Zurich pays you on tax you handed over before the general due date. The mirror of Ausgleichszins, which is what it charges on anything still outstanding after that date.Where you see itSettled in the final bill, after your assessment.Open in the glossary → (credit interest)
Still owed something after 30 September	The canton charges you interest on the shortfall	AusgleichszinsAusgleichszinsCompensatory interestFRintérêt compensatoireInterest on tax still outstanding after the general due date. Zurich names the other direction separately: Vergütungszins is what it credits you on payments made before that date. A third rate, Verzugszins, applies once a final bill is overdue.Where you see itSettled in the final bill, after your assessment.Open in the glossary → (charge interest)
Paid nothing until the final bill	Interest runs from 30 September	Ausgleichszins
Missed the final bill's own 30-day deadline	Separate default interest applies on top	Verzugszins (default interest)

The first two are settled together in one interest calculation attached to the final bill. The last one is different: it is what happens when a bill you were actually sent goes unpaid. The final bill has its own payment period of 30 days from delivery.

Do not confuse this 30 September with the filing one. Two unrelated deadlines share the date, a year apart. The one above is the Verfalltag. That is the interest date for paying, and it falls in the tax year itself, so for the 2025 return it was 30 September 2025. The other is the extension some filers get for sending the return in, which for the 2025 return runs to 30 September 2026. An extension moves the filing date and does not move the payment date; by the time you are granted one, the interest clock has been running for months.

The canton sets the rates each year, so check the current figures rather than assuming last year's. Credit interest and charge interest move together: both were 1% for 2025 and both are 0.75% from 2026. Default interest is set separately and is several times higher, which is why the one deadline never to miss is the 30 days on the final bill rather than the provisional estimate. Interest is worked out on the Marchzinsen basis, counting the year as 360 days and the month as 30.

The mechanism is worth understanding even if the rate is small: an overpayment is not lost. It comes back with interest in the final bill.

If your tax liability in Zurich began during the tax year, the clock may not have started at all. Where your liability starts after 31 December of the previous year and no first provisional invoice reached you by 30 June of the tax period, charge interest against you only begins on 1 January of the following calendar year. That covers most people who moved to the canton, or to Switzerland, mid-year. It is worth checking before paying an estimate early to avoid interest you are not yet accruing.

An objection does not buy you time to pay. Filing an 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 → or an appeal does not suspend the payment deadline, and default interest runs even while a remedy is pending. Dispute the amount and pay it, or pay what you accept and dispute the rest; do not treat a pending objection as permission to wait.

Changing the amount

You are not stuck with the canton's estimate, and this is the most useful thing to know.

• Your income fell. You changed jobs, went part-time, stopped working, or had a year without a bonus. Tell the municipal tax office and ask for a revised provisional invoice. An estimate built on a much better year will otherwise have you paying far too much for months.
• Your income rose sharply. A large bonus, equity vesting, a property sale. Paying more than the invoice asks is allowed and reduces the interest on the eventual shortfall.
• You simply want to pay differently. In instalments, or all at once. The cantonal ordinance already provides for instalments: municipalities collect the provisional amount in three parts (30 June, 30 September, 31 December) or in seven monthly parts from 30 June to 31 December. Which of the two your municipality uses is its choice, not yours, but it shows the system expects the money in pieces.

A short call to the municipal tax office (GemeindesteueramtGemeindesteueramtMunicipal tax officeITufficio fiscale comunale (GR only)Your municipality's tax office, which handles individual filings in Zurich. It is usually the right first contact, not the cantonal office.Where you see itThe sender of your filing notice and assessment.Open in the glossary →) of where you lived on 31 December handles most of this. That is the office to contact for individuals, not the cantonal administration.

The case that confuses source-taxed filers

A specific version of this catches people who have just moved out of tax at source, and it looks like double taxation.

You were taxed at source for part of the year, then filed an ordinary return. The provisional invoice arrives calculated on your income. It appears to ignore the tax your employer already handed over. Nothing has gone wrong. Source tax already paid is credited against your assessment. Federal law says so in plain words, and adds that it is credited without interest (DBG Art. 89 para. 6). But that crediting happens at assessment, not on the provisional invoice. The provisional stage is an estimate of the whole year's tax; the reconciliation comes later.

If the amount looks wrong because of it, that is a good reason to call and ask for a revised estimate rather than paying an amount you know is too high.

Common mistakes

• Assuming the printed date is the deadline that matters. The general due date of 30 September is what interest attaches to.
• Treating the estimate as your actual liability. It is based on an older year. Your real number arrives with the final bill.
• Paying nothing because "it is only a recommendation". True about the amount, misleading about the cost. Interest runs regardless.
• Not telling the office your income dropped. The estimate cannot know. Nobody adjusts it for you.
• Panicking about a bill for a year that is not assessed. That is the normal sequence in Switzerland, not a mistake by the tax office.
• Thinking an objection pauses the payment. It does not, and default interest keeps running while it is pending.
• Paying early in your first Zurich year to dodge interest that has not started. If you became liable during the year and no provisional bill reached you by 30 June, charge interest only starts the following January.

Common questions

Do I have to pay the Zurich provisional tax bill?

You are not obliged to pay that exact amount, because it is an estimate rather than an assessment. But the general due date of 30 September is real: from it, unpaid tax attracts interest and overpaid tax earns it. Paying roughly the right amount by then is the sensible course.

Can I change the amount on the provisional invoice?

Yes. Contact the municipal tax office of where you lived on 31 December and explain what changed. This is routine, particularly when income has fallen since the year the estimate was built on.

What happens if I overpay?

The excess is credited back in the final bill, with interest at the rate the canton sets for that year: 0.75% from 2026, down from 1% in 2025. Overpaying is not a loss, which is why some people deliberately pay more than the invoice asks.

I moved to Zurich this year. Does interest still run from 30 September?

Not necessarily. If your tax liability began after 31 December of the previous year and no first provisional invoice reached you by 30 June of the tax period, charge interest against you starts only on 1 January of the following calendar year. Check which case you are in before paying early.

Does filing an objection pause the payment?

No. Legal remedies do not suspend the payment deadline, and default interest is owed even while an objection or appeal is running. Pay what is due and pursue the dispute separately.

Why does the bill ignore the tax already taken from my salary?

Because crediting happens at assessment, not at the provisional stage. Source tax your employer paid is set against your final liability when the canton assesses you. The provisional invoice is an estimate of the whole year, not a running balance.

When is Swiss federal tax due?

Direct federal tax is billed separately from cantonal and municipal tax, and its general due date is 1 March of the year after the tax year, set by federal ordinance. Zurich sends the provisional federal invoice in March and asks for payment by 31 March. It is a different bill on a different timetable. Do not assume one covers the other.

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This article is general information, not tax, legal, or financial advice. Interest rates and due dates are set by the canton and change; confirm the current figures with your municipal tax office. PaperTax helps you complete your own official cantonal tax return. It does not file on your behalf. For advice on your own situation, consult a qualified Swiss tax professional.

Sources

Every figure in this guide is checked against these. Each link goes to the issuing document itself, not to a homepage or to somebody else's summary of it.

1. Canton Zurich — Verordnung zum Steuergesetz (tax ordinance), §§ 49–54: the 30 September due date, the three- and seven-instalment schedules, the 30-day period on the final bill, and the interest rules — zhlex.zh.ch
2. Canton Zurich — Weisung der Finanzdirektion über den Bezug der Staats- und Gemeindesteuern (ZStB 172.1): credit interest on payments before 30 September and equalisation interest on what is outstanding after it, the Marchzinsen basis (year 360 days, month 30), the exception for taxpayers whose liability begins during the tax period with no provisional invoice by 30 June, and the rule that legal remedies do not suspend the payment deadline — zh.ch
3. Canton Zurich — Weisung über die Ausstellung von Steuerrechnungen (ZStB 173.1), provisional invoicing — zh.ch
4. Canton Zurich — tax bills for individuals: which office is responsible, and how to ask for a revised provisional invoice — zh.ch
5. EFD ordinance on the due date and interest of direct federal tax (SR 642.124), Art. 1: general due date 1 March — fedlex.admin.ch
6. DBG Art. 89 para. 6 — source tax already deducted is credited against the assessment, without interest ("Die an der Quelle abgezogene Steuer wird zinslos angerechnet") — fedlex.admin.ch
7. Canton Zurich — Regierungsrat decision on setting and calculating interest on cantonal and municipal taxes (ZStB 174.1) — zh.ch; the rates themselves, credit and equalisation interest cut from 1% to 0.75% with effect from 2026 — zh.ch

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