I started to fill you my annual tax form. I use an electronic form,because it is know the tax rules better than me. it gives some clues.
natural (person) and legal entities paying taxes by different rules, and i will write about only person's type.
first page:
drawn taxes:
non independent job:
- salary
- spending money regarding to the job (phone bill, travel expenses, etc)
- salary for foreign work
- other salaries
- income from company (you own company)
- redundancy payment
independent job:
- independent job income (teaching, writing a book, similar things)
other incomes for working
- blablabla
Segregated taxes: as I see these are for just getting money without job:
- interest earnings, dividend, lending out flats
I think what we have to know is the last parts: interest earnings
I tried to make some search on the tax office website (and in google

but what I found is related only to stocks. So I think you don't have to pay tax for a general bank account deposit. Other savings forms are subject to be taxed.
btw it is not worth to deposit huge money for long time in a general bank deposit.
higher the interest rate more subject to be taxed (yeah, clever idea, if I will have enough money to buy a country I will do that too)