NOV (Nachtragsveranlagung) in Switzerland

If you have just moved to Switzerland or are navigating your first tax year as a resident, the NOV (Nachtragsveranlagung) is one of those terms that appears on your radar early — and that is worth understanding from the start. This supplementary tax assessment affects thousands of expats every year, and knowing how it works can make a real financial difference. Whether you are subject to Quellensteuer and earn more than CHF 120,000, or simply want to claim deductions you are entitled to, filing the Nachtragsveranlagung correctly is well worth the effort.

What is the Nachtragsveranlagung (NOV)?

The Nachtragsveranlagung is a supplementary tax filing used in Switzerland when a person has received employment income during the year that was not correctly covered by the employer’s standard withholding. It is particularly common among expats who arrive mid-year or whose employers are not correctly set up within the Swiss tax system.

Unlike the standard tax return (Steuererklärung), the NOV focuses specifically on validating and adjusting tax on employment income. Cantonal tax authorities use it to establish your definitive tax liability, cross-referencing the data with the Lohnausweis (salary certificate) issued by your employer.

NOV vs. Korrekturgesuch: don’t confuse the two

There is only one NOV — “nachträgliche ordentliche Veranlagung” (“Nachtragsveranlagung” is just the shorthand used for it). What causes real confusion among expats is mixing it up with the Korrekturgesuch (tariff correction request): the Korrekturgesuch only fixes an error in the withholding calculation itself (wrong taxable/rate-determining income, a wrong tariff code, disputed liability, or wrong foreign workdays) and cannot be used to claim deductions. If you want to claim Pillar 3a, further education, alimony, or other individual deductions not already built into your tariff, you need the NOV — not a Korrekturgesuch. See our Quellensteuer guide for the Korrekturgesuch process specifically.

Who is required to file a Nachtragsveranlagung in Switzerland?

Not every Swiss resident needs to file a NOV. In Zürich (representative of most cantons, though thresholds vary), a NOV becomes mandatory when any of the following applies:

• Gross annual employment income exceeds CHF 120,000 (a federal threshold, Art. 89 DBG — identical in every canton since the 2021 reform; other mandatory-NOV triggers, like additional non-source income or taxable wealth, do vary by canton)
• You have additional, non-source-taxed income above CHF 3,000/year (e.g. rental income, certain capital gains)
• You hold taxable assets above CHF 80,000
• You have self-employment income

Below those thresholds, filing is voluntary — you request it if you want to claim deductions that the flat withholding tariff doesn’t already account for. If your employer withheld taxes correctly and you don’t need to claim additional deductions, you are not required to file.

Full NOV calendar: key dates for expats

Understanding the timeline is essential to avoid missing important deadlines.

January: Lohnausweis issued

Your employer must issue the Lohnausweis (salary certificate) by 31 January of the following year. This document details:

• Gross annual salary
• Quellensteuer (withholding tax) deducted
• Social insurance contributions
• Other deductions applied

March: NOV filing deadline

The deadline to request the NOV (Antrag) is 31 March of the year following the tax year — for the 2026 tax year, that’s 31 March 2027. This is a Verwirkungsfrist: a peremptory, non-extendable deadline. Miss it, and the request for that year cannot be processed at all — this is different from the ordinary tax-return filing deadline (which some cantons, including Zurich, do let you extend), so don’t confuse the two. If your NOV is mandatory (e.g. income above CHF 120,000) and you’ve already been notified, the resulting tax-return filing may follow the ordinary, extendable deadline — but the initial 31 March window to trigger a voluntary NOV is fixed.

In Zurich, the filing is done online via ZHprivateTax, the canton’s online tax-return platform (it replaced the older offline “Private Tax” software starting with the 2025 tax period). Other cantons have their own digital platforms or paper-based alternatives.

April–August: review and processing

The cantonal tax authorities review the NOV, cross-reference the Lohnausweis data with the information reported by the employer, and calculate the definitive tax liability. This is a standard administrative process that rarely requires direct intervention on your part, unless data is missing.

September–December: Veranlagungsverfügung issued

You will receive the Veranlagungsverfügung (final tax assessment), which sets out:

• Your definitive taxable income
• Total taxes owed
• Taxes already paid during the year
• Amount to be refunded or balance due

Within 30 days: payment or refund

If additional taxes are due, the payment deadline is 30 days from the date of the Veranlagungsverfügung. Refunds are typically processed within the same period.

Deductions you can claim through the NOV

One of the most practical reasons to file the Nachtragsveranlagung is access to the full range of Swiss tax deductions — none of which are available through standard Quellensteuer withholding. They vary by canton (both the deduction rules and the cantonal tax rate that determines their cash impact), so treat the figures below as illustrative categories, not a promise of savings:

For expats earning above CHF 120,000 — where the NOV is mandatory nationwide (federal threshold, identical in every canton) — these deductions carry particular weight. Each eligible item directly reduces the taxable base; the actual tax saved depends on your marginal rate, which is canton- and municipality-specific.

How to file the NOV in Zurich (ZHprivateTax)

Zurich, home to Switzerland’s largest expat community, offers a fairly streamlined digital process. It is one of the best-designed cantonal systems for someone without specialist accounting training.

Step-by-step process:

1. Access ZHprivateTax via the cantonal portal (www.zh.ch)
2. Create an account or log in with your digital ID
3. Import your Lohnausweis, which your employer will have submitted electronically
4. Complete the NOV form with your personal and employment details
5. Add all applicable deductions — commuting, Pillar 3a, insurance, childcare, etc.
6. Review and validate the complete filing
7. Submit electronically before 31 March

The platform performs real-time validation, flagging incomplete fields or inconsistencies before you submit. Most expats can complete the process without professional assistance, although complex income situations may warrant consulting a Swiss tax adviser.

Tax impact for expats: how to estimate it yourself

The actual difference the NOV makes depends entirely on your canton, municipality, marital status, and which deductions you’re entitled to — there is no single representative figure, and we won’t publish one without a specific, documented case. As an order of magnitude, Pillar 3a alone (up to CHF 7,258 for 2026) removed from your taxable income at a marginal rate in the 20-30% range typically saves roughly CHF 1,500-2,000 in tax, before any other deduction — but confirm your own numbers with your canton’s official tax calculator (most cantons, including Zurich, publish one) rather than relying on a generic example.

Over several years of Swiss residency, the cumulative impact of consistently claiming eligible deductions through the Nachtragsveranlagung is considerable.

Common mistakes when filing the NOV

Certain errors recur frequently among expats and delay processing or result in incorrect assessments:

• Not declaring all salary income, including bonuses and benefits in kind
• Overlooking eligible deductions such as Pillar 3a contributions or commuting costs
• Using figures from the previous year without updating to the current tax year
• Lacking documentation to support the deductions claimed
• Missing the 31 March deadline, which for a voluntary request means losing the right to file for that tax year entirely (it’s a peremptory deadline, not a fine)

Frequently Asked Questions: NOV in Switzerland

What is the NOV (Nachtragsveranlagung)?

NOV is a supplementary tax assessment that functions as a full tax return for Quellensteuer payers. If your gross annual income exceeds CHF 120,000, you are required to file a NOV, which recalculates your actual tax liability and results in either a refund or additional payment.

What is the deadline for filing the NOV?

31 March of the year following the tax year to submit the request — for the 2026 tax year, 31 March 2027. This is a peremptory deadline (Verwirkungsfrist) and generally cannot be extended, which is different from the ordinary tax-return filing deadline that some cantons do let you extend once the NOV has been triggered.

What can I deduct in the NOV that I cannot claim via withholding?

All standard Swiss tax deductions: Pillar 3a (up to CHF 7,258), Pillar 2 buybacks, commuting costs, further education and professional development, childcare costs, mortgage interest, alimony, health insurance premiums above the cantonal flat deduction, and charitable donations.

If my income is just over CHF 120,000, should I be worried about the NOV?

Not necessarily. The NOV recalculates your exact tax. If you have been paying Quellensteuer at the correct rate and have no additional deductions, the difference will be small. Many expats in the CHF 120,000–140,000 range actually receive a small refund after the NOV, precisely because they can now claim deductions.

What happens if I file the NOV after 31 March?

For a voluntary request (you’re below the mandatory income/asset threshold and want to claim deductions), the 31 March deadline is a peremptory Verwirkungsfrist: a late request generally cannot be processed at all for that tax year — it isn’t a matter of a penalty or late-payment interest, the right to request that year’s NOV is simply forfeited. If your NOV is mandatory (e.g. income above CHF 120,000) and you fail to respond to the tax authority’s own filing requirement, that is a separate compliance failure that can trigger a discretionary assessment and, in serious or repeated cases, penalties under cantonal tax procedure law — consult a tax adviser if you’ve missed a mandatory filing requirement.

Do I need a tax adviser to file the NOV?

It is not mandatory. However, expats with complex income structures or multiple income sources often recover the cost of advice many times over. Typical fees range from CHF 200 to CHF 500 — an amount frequently offset by optimised deductions.

Can I correct the NOV after submitting it?

Yes, within certain deadlines. If you made an error or forgot a deduction, you can submit a correction request within 30 days of the original filing. After that window, the process becomes more complex and may require a formal objection (Einsprache).

Conclusion

The Nachtragsveranlagung is a central part of your tax obligations as an expat in Switzerland — not a minor bureaucratic formality. For those subject to Quellensteuer with gross income above CHF 120,000, filing the NOV is mandatory. For others, it is often the only mechanism through which the full range of Swiss tax deductions can be claimed and the actual tax liability corrected. Start by collecting your Lohnausweis in January, review the deductions available in your canton, and mark 31 March in your calendar. The digital tools available in cantons such as Zurich make the process perfectly manageable for most expats — and the financial benefit of doing it right is real.

Related Articles

• What Is Quellensteuer in Switzerland? Complete Guide for Expats
• How to Claim a Quellensteuer Refund in Switzerland
• B Permit and Quellensteuer: What Every Expat Must Know

Official sources

• Swiss Federal Tax Administration (ESTV) — Tax information for individuals
• Kanton Zürich — Nachträgliche ordentliche Veranlagung beantragen (mandatory triggers, request deadline, deductions)
• Kanton Zürich — ZHprivateTax, online tax declaration platform
• Kanton Solothurn — Nachträgliche ordentliche Veranlagung (NOV) beantragen (Verwirkungsfrist consequences)
• Berufskostenverordnung (SR 642.118.1), Art. 5 Abs. 1 — federal commuting-cost deduction capped at CHF 3,000/year (in force since the 2016 FABI reform)
• Swiss Federal Council — Legal and administrative information