📅 Field note from: September 2020 | Last updated: May 2026 Originally written when SFTA’s professional trader criteria were being widely discussed; updated with five years of cantonal practice in May 2026.
The Swiss crypto tax headline is simple: capital gains are tax-free for private investors. Most people stop reading there.
What the headline omits is that “private investor” is not a default state. It is a classification you need to actively maintain — and the Swiss Federal Tax Administration has published five specific criteria that determine whether you qualify.
The six-month holding rule is the most frequently cited of the five. It is also the most misunderstood. Holding for six months does not automatically make you a private investor. It is one condition among five, and failing any one of them can put your entire capital gains exemption at risk.
This field note covers all five criteria, what borderline cases actually look like, and why cantonal practice matters more than the written rules suggest.
Why Classification Matters: The Tax Gap Between Private and Professional
Before getting into the criteria, it helps to understand what is actually at stake.
A private investor who sells CHF 500,000 worth of Bitcoin at a gain: pays zero capital gains tax. None. The same outcome in Germany, France, or the UK would trigger a substantial tax bill.
The same person, reclassified as a professional securities dealer: pays income tax on those same gains. At Zug’s marginal rates, that could be 18–25%. At Geneva’s rates, closer to 40–43%. And on top of income tax, AHV contributions apply — roughly 10.6% on the taxable income from trading.
The financial gap between the two classifications is significant. This is why the KS 36 criteria matter, and why cantons take reclassification seriously.
The Five Safe-Harbour Criteria (KS 36)
The Swiss Federal Tax Administration’s Kreisschreiben Nr. 36, issued in July 2012 and formally applied to crypto in December 2021, defines five conditions. Meeting all five creates a strong presumption of private investor status. These conditions are cumulative — the intent is that you need to satisfy all of them, not a majority.
| # | Criterion | What it means in practice |
|---|---|---|
| 1 | Holding period ≥ 6 months | Each position you sell must have been held for at least six months before the sale. Individual coin tracking matters here — FIFO or specific identification. |
| 2 | Transaction volume ≤ 5× opening balance | The sum of all purchases and sales in a calendar year must not exceed five times the value of your crypto portfolio at the start of that year. |
| 3 | Capital gains < 50% of net income | Your realized crypto gains for the year must not represent more than half of your total taxable income. If trading profits are your primary income source, this criterion fails. |
| 4 | No debt financing | You are not using borrowed money (loans, margin, leverage) to fund crypto positions. Or if you are, the income from your crypto assets exceeds the interest cost. |
| 5 | Derivatives for hedging only | Options, futures, and other derivatives are used only to hedge existing positions — not as standalone speculative instruments. |
Where People Actually Run Into Problems
The holding period criterion is the most visible, but in my observation — watching people navigate this in Zug over several years — it is not the one that creates the most unexpected reclassifications.
The transaction volume criterion catches active traders. If you started 2020 with CHF 100,000 in crypto and executed CHF 550,000 in combined purchases and sales during the year, you have exceeded the five-times threshold. This can happen faster than people expect during volatile markets when they are rotating between Bitcoin, ETH, and altcoins. Each swap is a sale plus a purchase — both sides count.
The income criterion catches people who had a very good year. If your salary is CHF 80,000 and you realized CHF 50,000 in crypto gains, the gains represent roughly 62% of your total taxable income. That exceeds the 50% threshold. The criterion is designed to identify people for whom trading has essentially become their primary income source.
The debt financing criterion catches leveraged traders. If you took out a loan or used margin to fund crypto purchases, you are likely failing this criterion unless the yield from your crypto assets clearly exceeds the interest cost — which at 2024–2025 interest rates is harder to demonstrate than it was at near-zero rates.
The derivatives criterion catches anyone speculating on futures or options beyond simple hedges. If you are actively trading perpetual futures or buying options for directional exposure, this is probably a failing criterion regardless of your holding period on spot positions.
The Six-Month Rule in Practice: Per-Position, Not Portfolio-Wide
One clarification that often surprises people: the six-month holding requirement applies to each individual position you sell, not to your overall portfolio.
You cannot hold a diversified portfolio for two years and then sell a position you bought last month and claim the holding period is satisfied because “most of my portfolio has been held longer.” The taxable event is the specific coins sold, and their individual acquisition date is what matters.
In practice, this means:
- If you use FIFO accounting, selling any amount means the oldest coins go first — which helps with the holding period.
- If you specifically identify coins to sell (a method some cantons allow), you can choose which acquisition dates apply to each sale.
- Staking rewards and airdropped tokens have their own acquisition dates from when they were received — which can complicate holding period tracking if you sell those positions.
Cantonal Practice: The Gap Between the Written Rule and Reality
Here is what the formal KS 36 documentation does not fully capture: cantonal application of these criteria is not uniform, and in several cantons, the safe-harbour thresholds are applied conservatively in ways that go beyond the literal text.
The cantons of Zug, Zurich, Lucerne, and Aargau have all been noted by Swiss tax practitioners as applying these criteria carefully — meaning that even if you technically satisfy all five thresholds, the overall picture of your trading activity is considered. Frequency of trading, sophistication of strategy, use of professional tools, and whether you spend significant time on crypto activity can all factor into a cantonal tax office’s assessment, even if each individual criterion technically passes.
Geneva and the French-speaking cantons tend to apply similar scrutiny, though with different baseline income tax rates — which makes reclassification more costly there in absolute terms.
The practical implication is that KS 36 is a safe harbour in the sense that clearly meeting all five criteria makes it very difficult for cantonal authorities to reclassify you. But borderline cases — where one criterion is close to the threshold, or where your overall activity pattern looks like systematic trading — create genuine uncertainty that the written thresholds alone do not resolve.
If you are actively managing a portfolio and want confidence about your classification, getting a written tax ruling (Ruling) from your cantonal tax office is the only way to get certainty before you file.
The Interaction with Wealth Tax and Staking Income
Private investor status affects capital gains tax — it does not change your wealth tax obligations. Every crypto holder in Switzerland, regardless of classification, pays annual cantonal wealth tax on their portfolio value as of December 31st.
The Swiss Crypto Tax Advantage guide covers the full structure: what qualifies for the capital gains exemption, how wealth tax works separately, and why the combination is still favorable compared to most European jurisdictions.
Staking income adds another layer. If you stake ETH while holding it as part of a long-term private investor strategy, the staking rewards themselves are taxed as income — that part is unaffected by your private investor classification. The classification only matters for capital gains. The staking income field note covers this distinction in detail.
And separately, the wealth tax calculation field note explains how the December 31st portfolio snapshot works, including the SFTA Kursliste reference rates — which applies to all crypto holders, private investors and professional traders alike.
A Practical Summary
The “six-month rule” is shorthand for a more complete picture. For most long-term holders with a clear investment strategy and no leverage:
- Hold positions for at least six months before selling any of them
- Do not trade so actively that annual transaction volume exceeds five times your starting portfolio size
- Make sure crypto gains do not become your primary income source
- Avoid leverage and speculative derivatives
Meeting these conditions does not guarantee a clean classification in every cantonal dispute, but it gets you close to the safe-harbour zone the SFTA designed. The further you deviate — particularly on holding period and transaction volume — the more you look like a professional securities dealer under Swiss tax law, regardless of how you characterize your own activity.
The stakes are real. Capital gains tax-free is a meaningful structural advantage. Preserving it requires understanding the conditions it depends on.
Not tax advice. Swiss tax treatment of crypto depends on individual circumstances, cantonal variation, and annual SFTA guidance. This field note describes the general framework as understood in Zug in September 2020 and updated through May 2026. Consult a qualified Swiss tax professional for your specific situation.