Which letters, and why?
| Letter | Status | Why |
|---|---|---|
| Termination of a lease by the landlordHow to send it | RecommendedHand-signed original needed | The notice must be given on the official form approved by the canton and signed, otherwise it is void. For a family home it must be sent separately to the tenant and to the spouse or registered partner; registered mail proves receipt.Deadline: For a flat, at least three months to a local or contractual termination date; the notice must arrive before the period starts. A registered letter generally counts as received from the first day it can be collected at the post office. |
| Termination of a lease by the tenantHow to send it | RecommendedHand-signed original needed | The notice must be in writing and signed by hand; email is not enough. For a family home the spouse or registered partner must expressly consent, ideally by also signing the letter, even if only one person signed the lease.Deadline: For a flat, at least three months to a local or contractual termination date; what counts is receipt by the landlord, not the postmark. |
| Payment deadline with threat of termination for rent arrears | RecommendedHand-signed original needed | The landlord must set the payment deadline in writing and clearly threaten termination; for a family home separately to both spouses. Whether the deadline was respected depends on the date of receipt, so registered mail is the norm.Deadline: At least 30 days for homes and business premises. If the registered letter is not collected, the period only starts on the seventh day after the delivery attempt. |
| Challenge to a rent increase | RecommendedHand-signed original needed | The challenge is not sent to the landlord but to the cantonal conciliation authority. A written application is in time if handed to the post on the last day; registered mail proves that date.Deadline: 30 days after the increase was notified. If the landlord's registered letter is not collected, it counts as notified on the last day of the seven-day collection period. |
| Asking for a rent reduction, for example after the reference interest rate fallsHow to send it | RecommendedHand-signed original needed | A reduction is not automatic: the tenant must ask the landlord in writing, signed by hand. Two 30-day periods follow the request, for the landlord's answer and then for going to the conciliation authority. The Federal Office for Housing advises registered mail so that the date is fixed.Deadline: The reduction applies from the next termination date at the earliest. The landlord has 30 days to reply, then you have 30 days to go to the conciliation authority. |
| Reclaiming the rent deposit | Recommended | The bank only releases the deposit with both parties' consent, on a final decision or after one year. A registered letter shows when you asked for the release.Deadline: If the landlord has not taken legal action within one year after the lease ends, you can reclaim the deposit directly from the bank. |
| Notice of defects to the landlord | Recommended | Simply reporting a defect has no form requirement. If you want to threaten to deposit the rent, you must set a reasonable deadline in writing; a signed registered letter is then the safe route.Deadline: Report defects promptly. After depositing rent, you must bring your claims to the conciliation authority within 30 days. |
| Resignation by the employeeHow to send it | Recommended | The law prescribes no form, but many employment contracts require writing. Notice only takes effect once the employer has received it; registered mail or a signed receipt proves that.Deadline: Unless agreed otherwise: seven days during probation, one month in the first year, two months in years two to nine, then three months, each to the end of a month. |
| Dismissal by the employer | Recommended | The employer also faces no legal form unless the contract says otherwise. Because notice periods and protected periods run from receipt, proof of the date matters; on request the reasons must be given in writing.Deadline: Same notice periods as for employees. Protected periods apply during illness, accident, pregnancy or military service. |
| Cancelling a private insurance policy (e.g. supplementary, household or car) | Not needed | The Insurance Contract Act allows cancellation in writing or in text form, so email works too. What matters is being able to prove timely receipt; a confirmation from the insurer is enough.Deadline: Ordinary cancellation at the earliest to the end of the third year with three months' notice, unless the contract is shorter; a special right applies after a claim. |
| Cancelling a subscription (mobile, internet, gym) | Often required by contract | There is no legal form for these subscriptions; the contract terms decide. If they require registered mail or writing, follow them to avoid disputes about receipt.Deadline: Notice period and date as in the contract; many subscriptions renew automatically unless cancelled in time. |
| Cancelling basic health insurance (switching insurer)How to send it | Recommended | The cancellation must reach the old insurer in time; the postmark is not enough. The Federal Office of Public Health recommends sending it by registered mail or A-Post Plus about two weeks before the deadline and signing up with the new insurer at the same time.Deadline: After the new premium is announced: received by the last working day of November to switch on 1 January (2026: Monday 30 November). Without a premium change, three months to the end of June or December, if the insurance model allows it. |
| Payment reminder and formal notice of default | Recommended | A reminder puts the debtor in default, from which point default interest runs. There is no form requirement, but if you later start debt collection or go to court you must be able to prove the date. |
| Request to start debt collection (Betreibung) | Not needed | The request can be filed in writing, orally or electronically with the debt collection office where the debtor lives. Registered mail adds little because the office processes it and serves the payment order itself. |
| Objection to a payment order (Rechtsvorschlag) | Recommended | The objection halts the collection and needs no reasons. If you do not raise it when the order is served and send it by post instead, you must be able to prove the deadline was met; registered mail suits that.Deadline: Within ten days of the payment order being served. |
| Objection to a tax assessment | RecommendedHand-signed original needed | The objection must be filed in writing and signed with the assessment authority. It is in time if handed to Swiss Post on the last day; registered mail proves that date.Deadline: 30 days after the assessment is served. An uncollected registered decision is usually deemed served on the seventh day after the delivery attempt. |
| Objection to a penalty order (e.g. a fine) | RecommendedHand-signed original needed | The objection must be in writing; an ordinary email is not enough. It is in time if handed to the post on the last day; registered mail proves this.Deadline: Ten days from service. An uncollected registered penalty order is deemed served on the seventh day after the delivery attempt if you had to expect it. |
| Withdrawal from a doorstep or telephone sale | Recommended | Withdrawal has no form requirement, but you must prove it was in time. Registered mail proves you posted it on the last day. Switzerland has no general statutory withdrawal right for online purchases.Deadline: 14 days from the contract and receiving the withdrawal information; posting on the last day is enough. |
| Notice of defects after a purchase (warranty claim) | Recommended | Defects must be reported immediately after discovery, otherwise the goods count as accepted. No form is prescribed; in a dispute, proof of the date and content helps. Many sellers replace the statutory warranty with their own terms.Deadline: Report immediately on discovery; claims expire two years after delivery. |
FAQ
Which letters must go by registered mail in Switzerland?
None of the letters listed here is required by law to go by registered mail. It is the usual proof when receipt or timely posting matters, for example a lease notice, cancelling basic health insurance or an objection to a payment order.
Is registered mail enough to end a Swiss lease?
The notice must be in writing and signed by hand; email is not enough. For a family home the spouse or registered partner must expressly consent. The issue is the hand-signed original, not the registered letter; registered mail proves receipt.
When does an uncollected registered letter count as received?
For a decision by an authority, such as a tax assessment or a penalty order, usually on the seventh day after the delivery attempt, if you had to expect it. For a lease notice, usually from the first day it can be collected at the post office.
Do I have to cancel Swiss health insurance by registered mail?
It is not required, but advised. The cancellation must reach the insurer by the last working day of November, in 2026 Monday 30 November. The Federal Office of Public Health suggests registered mail or A-Post Plus about two weeks before the deadline.
Can I cancel private insurance or a subscription by email?
Private insurance, yes: the Insurance Contract Act accepts writing or any form that allows proof by text, so email works. For a mobile, internet or gym subscription the contract decides; if it asks for registered mail, follow it.