Side Hustle vs. Main Employment: Getting the Classification Right

Many people start with a side business while employed. The AHV rules treat side income differently from a main self-employed activity.

The side-hustle rules

Side income under CHF 2,500 per year is usually exempt from AHV self-employment contributions, provided you are already contributing as an employee. Above that, self-employment rules begin to apply.

The CHF 2,500 exemption exists because small side earnings are not treated as a separate self-employment. Your main employment already secures your AHV.

The threshold is per year and per activity. If you cross it, the side activity gains its own contribution obligation on the excess or the whole, depending on the assessment.

The exemption is about the income amount, not the number of hours you spend. A tiny but time-consuming hobby business can still fall under it.

• Under CHF 2,500: usually no self-employed AHV.
• Above CHF 2,500: register and contribute.
• Your main job already covers your AHV as an employee.

When it flips

If the side activity grows into a real business — significant income, your own infrastructure, multiple clients — it becomes a genuine second self-employment and must be registered as such.

The flip is not automatic at CHF 2,500. The compensation fund looks at the overall picture: income, client base and how the activity is run.

Once it is a genuine self-employment, you register it with the compensation fund and begin paying contributions on that side income.

The side income is assessed separately from your employment income for AHV, though it all counts toward your overall tax position.

Talk to the fund

Proactive registration avoids the retroactive demands that come when a growing side business is discovered later. The fund can chase contributions back for years.

Explain your situation honestly, including your main employment. The fund will confirm whether and how much you owe on the side income.

Even below the threshold, it can be worth informing the fund so your status is clear on paper. A short confirmation letter is cheap insurance.

Keeping it clean

Track your side income separately from your salary from day one. A dedicated spreadsheet or accounting tool makes the classification easy to demonstrate.

Keep your side-hustle invoices organised, since they are the evidence for both the CHF 2,500 assessment and your tax return.

If you cross the threshold, register the activity and start setting aside the contribution percentage on the side income, just as you would for full self-employment.

facturio keeps your side-business invoicing separate and clean, so proving your income to the compensation fund or tax office is straightforward.