Nebenkosten in Switzerland: an annotated sample lease

Nebenkosten (service charges) are what you pay on top of the net rent for running the building, such as heating, hot water, the caretaker and the electricity for shared areas. Under Swiss federal law your landlord may bill only the items your lease names (OR Art. 257a Abs. 2), and only what they actually cost (OR Art. 257b Abs. 1). If you pay them in advance (akonto), you get a statement at least once a year (VMWG Art. 4 Abs. 1), and you have the right to see the receipts behind it (OR Art. 257b Abs. 2).

Below is a sample lease in German with English notes on each line, a worked annual statement in CHF and an 11-step checklist that gives the legal source for each step. The rules quoted are federal, so they apply in every canton. Your own lease and cantonal practice can add details, so read this as general information, not legal advice.

What are Nebenkosten, and what do they usually cover?

The Code of Obligations (OR) defines Nebenkosten as payment for services of the landlord or a third party that are connected with your use of the flat (OR Art. 257a Abs. 1). For flats, the landlord may charge the actual costs of things like heating, hot water and "similar running costs", plus public charges that arise from use (OR Art. 257b Abs. 1).

The key word is "agreed". You pay Nebenkosten only if your lease specifically says so (OR Art. 257a Abs. 2). The Zurich courts put it plainly: if nothing is agreed separately, all services are covered by the net rent, and items billed separately must be listed individually and precisely in the lease (gerichte-zh.ch).

Lines you may see in a lease include the following. Each is billable only if your lease names it.

Three rent words to know:

• Nettomietzins (net rent): the rent for the flat itself.
• Nebenkosten (service charges): the running costs on top.
• Bruttomietzins (gross rent): net rent plus Nebenkosten, the amount that leaves your account each month.

Unless your lease or local custom says otherwise, rent and Nebenkosten are due at the end of each month (OR Art. 257c).

Akonto or pauschal: which one is in my lease?

Your lease will use one of two words next to the Nebenkosten figure, and they work differently.

Two points are easy to miss.

First, akonto payments do not have to be close to the real costs. The Zurich courts note that a tenant cannot expect the advances to roughly match the actual costs, citing the Federal Court (gerichte-zh.ch, with BGE 132 III 24 and BGer 4A_339/2018). A low akonto in a flat ad can therefore lead to a large balance later.

Second, pauschal is not a blank cheque either. Whichever method your lease uses, what you are finally charged must reflect the actual costs (OR Art. 257b Abs. 1; gerichte-zh.ch): with akonto, the yearly statement settles the difference; a flat rate must rest on three-year averages (VMWG Art. 4 Abs. 2).

A landlord also cannot simply start billing new Nebenkosten mid-lease. According to the Zurich courts, adding them later is only possible by changing the contract (gerichte-zh.ch).

How do I read the Nebenkosten lines in my lease?

Below is our own sample lease excerpt. Sample, not a real lease: we wrote it to show the wording you are likely to meet. The German is on the left, our English notes on the right.

These four lines set what leaves your account each month.

Which lease lines should I ask about?

The next three lines of the same sample lease decide what the yearly statement can add, so they are the ones to question before you sign or when the first statement arrives.

If your lease has the akonto amount but no list of items, or only a general phrase, that is the line to ask about first.

What can a landlord never bill as Nebenkosten?

Some costs belong to the landlord whatever the lease says.

For heating and hot water, the ordinance lists what may be charged: among others the fuel and energy used, electricity for burners and pumps, cleaning of the heating and chimney, metering and billing, maintenance, insurance premiums for the heating system only, and the administration of running it (VMWG Art. 5). If your heating bill is not itemised, it must tell you that you can ask for a detailed one (VMWG Art. 8 Abs. 1).

Empty flats matter most in larger buildings. The heating costs for them are the landlord's (VMWG Art. 7 Abs. 1). If your statement shows a building total divided by fewer flats than the building has, ask how vacancies were handled.

What does a worked annual statement look like?

Here is a hypothetical statement for the sample lease above. Assumptions: billing year 1 July 2025 to 30 June 2026; any canton (federal rules only); an admin fee of 3% of the billed costs. The 3% is our assumption, not law (VMWG Art. 4 Abs. 3: at cost or within the usual rates; no percentage is set).

Now the check. Suppose the lift had not been listed in the lease. Then the CHF 180 could not be billed (OR Art. 257a Abs. 2):

• Items: CHF 3,150 − CHF 180 = CHF 2,970.00
• Admin fee, 3% of CHF 2,970 (same assumption, not law: VMWG Art. 4 Abs. 3) = CHF 89.10
• Total billed: CHF 3,059.10
• Balance: CHF 59.10 instead of CHF 244.50

One unlisted line changes the balance by CHF 185.40 (CHF 180 plus CHF 5.40 of fee). That is why step 2 of the checklist below is to compare the statement with your lease, line by line.

This example does not show whether CHF 1,920 for heating is reasonable. That depends on the building, the energy source and the winter. The statement tells you what was spent; the receipts show whether it was really spent.

How do I check my Nebenkostenabrechnung?

The Federal Office for Housing advises: "You should always check the service charges statement carefully" (BWO brochure, p. 11). These are the steps, each with the rule behind it. Steps 7 and 9 are practical tips, not legal rules.

1. Akonto or pauschal? Only akonto leads to a statement (VMWG Art. 4; BWO brochure, p. 11).
2. Is every billed item named in your lease? Items that are not agreed are covered by the net rent (OR Art. 257a Abs. 2; gerichte-zh.ch).
3. Were all your akonto payments credited? Twelve times the monthly amount, minus any months you did not live there. This is an arithmetic check: the balance is the actual costs (OR Art. 257b Abs. 1) minus what you paid.
4. Are only actual costs billed? Round estimates are not actual costs (OR Art. 257b Abs. 1).
5. Heating: only items from VMWG Art. 5; no repairs, renewal or depreciation (Art. 6); empty flats are not loaded onto you (Art. 7 Abs. 1).
6. Admin fee: at cost or within the usual rates (VMWG Art. 4 Abs. 3). Ask how it was worked out; the law names no percentage.
7. Practical tip (no legal source): is the distribution key stated (by m², by volume, by meter), and is it the same as last year? A change of key can move costs between flats.

What should I do if a line looks wrong?

Do not stop paying the whole bill while you check. Unpaid Nebenkosten count as rent arrears: for a flat, the landlord can set a payment deadline of at least 30 days and, if you still do not pay, terminate the lease with at least 30 days' notice to the end of a month (OR Art. 257d Abs. 1-2). The steps continue:

8. Ask to see the receipts. This is your right in law (OR Art. 257b Abs. 2); for heating you or someone acting for you may inspect the original documents and ask for the fuel stock at the start and end of the period (VMWG Art. 8 Abs. 2). Ask in writing and keep a copy.
9. Practical tip (no legal source): a big jump compared with last year? Ask the landlord or the property manager for the reason first. Energy prices, a new caretaker contract or a different key can all explain it.
10. Pay the undisputed part and query the rest in writing. Paying what you do not dispute limits the arrears risk under OR Art. 257d. If you cannot agree, the next step is the cantonal conciliation authority (Schlichtungsbehörde), the official point of contact for tenants and landlords in rental disputes (BWO brochure, p. 11). Writing is our advice for keeping a record; we found no federal rule that requires it at this stage. You can also ask an association for its view: the Mieterverband (tenants' association) or the HEV, Hauseigentümerverband (homeowners' association, the landlords' side). Both are private associations, not authorities.
11. Already paid too much? See "How long do I have to query or reclaim?" below. In short, the general rule is 3 years from when you learned of it, 10 years at most (OR Art. 67 Abs. 1).

Can I see the receipts, and how?

Yes. Your landlord must let you inspect the receipts on request (OR Art. 257b Abs. 2). The article is not limited to advances, so it covers flat rates too; the Zurich courts state the right without any such limit (gerichte-zh.ch). For heating and hot water, the ordinance adds that you or a representative may inspect the original documents and ask for the opening and closing stock of heating fuel (VMWG Art. 8 Abs. 2).

The law gives the right but says little about the practical details, such as where the inspection takes place or who pays for copies. In a short written request:

• name the property and the billing period (for example 1 July 2025 to 30 June 2026);
• list the lines you want to see receipts for;
• ask for a date to inspect them, or for copies;
• keep a copy of your request and note the date you sent it.

Look for three things in the receipts: that each invoice belongs to the billing period, that it belongs to your building, and that the total matches the statement line. If the statement splits a building total, check that the share charged to you follows the stated key.

How long do I have to query or reclaim?

There are two different questions here.

Querying a new statement. Federal law sets no objection deadline for the statement itself, as far as we found in OR Art. 257a-257e and VMWG Art. 4-8. Many leases add their own deadline, so check yours. Do not rely on a "30 days" rule you may read elsewhere: the 30 days in OR Art. 257d is the landlord's payment deadline for arrears, not a deadline for your objection.

Reclaiming money you already paid. This runs on the rules for unjust enrichment. As the general rule, the claim expires 3 years after you learned of it and at the latest 10 years after it arose (OR Art. 67 Abs. 1, in this form since 1 January 2020). You also have to show that you paid by mistake, believing you owed it (OR Art. 63 Abs. 1). The Federal Court has said the mistake does not have to be excusable, but a tenant who paid while knowing there was no valid agreement cannot reclaim (BGer 4A_451/2017, E. 5.3).

Lease clauses and case law can matter for your own situation. If a lot of money is involved, the cantonal conciliation authority can tell you how the rules apply to your case.

What this means for your budget

Budget the gross rent, not the net rent. In the sample lease that is CHF 2,000 a month, not CHF 1,750.

Then plan for the yearly statement. With akonto, the balance can go either way (BWO brochure, p. 11), and the advances do not have to match real costs (gerichte-zh.ch). A small monthly reserve turns a surprise bill into a planned one:

1. Take last year's balance from your statement. In our example it was CHF 244.50.
2. Divide by 12: CHF 244.50 ÷ 12 = CHF 20.375, so set aside about CHF 20.40 a month, rounded up.
3. In your first year, with no statement yet, ask the landlord or the previous tenant what the last balance was, or start with a round reserve and adjust when the first statement arrives.

If you get money back, move it to the reserve rather than spending it; next year can go the other way.

Any spreadsheet will do this. Our Swiss Budget Planner has a "Rent and Nebenkosten (service charges)" line that keeps gross rent and the yearly reserve together. Nebenkosten are one of several fixed costs that need a reserve; the other big one is your health insurance franchise, covered in our franchise 2027 guide.

Sources and last checked

All rules were checked on 9 October 2026 against these sources (German unless stated):

• Code of Obligations, OR (SR 220), Stand 1 October 2026: Art. 63, 67, 256b, 257a, 257b, 257c, 257d.
• Ordinance on the rental of residential and business premises, VMWG (SR 221.213.11), Stand 1 October 2025: Art. 4, 5, 6, 7 Abs. 1, 8.
• Zurich courts, Nebenkosten guidance, citing BGE 132 III 24 and BGer 4A_339/2018.
• Federal Court, BGE 135 III 591 (University of Bern mirror) and BGer 4A_451/2017 of 22 February 2018 (entscheidsuche.ch mirror).
• Federal Office for Housing, "Living in Switzerland" (English), p. 10-11.

All CHF amounts on this page are a made-up example to show the maths. No official average for Nebenkosten was found, so none is given.