What contributions do non-working persons pay?
Non-working persons pay OASI, DI and EO contributions. The amount of the contributions is based on the assets and pension income. The minimum annual contribution for non-working persons is currently CHF 514.

The maximum contribution (from 1.1.2012) is 50 times the minimum contribution. Your own contributions will lapse if your spouse (or registered partner) is deemed to be employed (minimum 50%) within the meaning of OASI and pays contributions amounting to at least double the minimum contribution (CHF 1028).

How much are your contributions?
The online calculator will give you that information.

More details
Leaflet 2.03 - Non-employed contributions to Old-Age and Survivors' Insurance (OASI), Disability Insurance (DI) and Income Compensation Insurance (IC)

Form
Registration as a non-working person