I'm doing my Swiss Tax Declaration using the Private Tax application and have a few questions:

1. Do I need to declare stocks / cryptos sold before the year end?
2. My broker has a Stock Yield Enhancement Program where they paid me interest on my stocks lent to their clients for short-selling purposes. How do I declare this income?
3. Are purchase dates required to be input for all stocks / cryptos?
4. Where do I declare the free cryptos received (e.g. KICK, NeoGas)?
5. What happens if I make a mistake in terms of putting income (e.g. from 2. and 4.) in a wrong place on the tax form? Full taxable income would be declared in any case.