[cpv]

It might depend, on country, but I know that usually you can mention donations as "donations" in your income papers/form.

Don't know how it would be for an opensource project. Mentioning something like "open source browser extension uBlock Origin" probably...

Interesting how people report their donations, patreons, etc.

[jobigoud]

Patreon aren't donations, they are recurring income in exchange of something (membership model with specific rewards per tier). In many jurisductions these must be declared differently.