@Udo ********
That is a perfect use-case for the Fixed Deposit Account.
The Fixed Deposit Account has a higher interest the longer you agree on keeping the money in the account without any withdrawals.
You can still withdraw whatever money you have in there, but you will lose all the accrued interest since you broke the terms.
You can do deposits into the account whenever.
This account will not show up in your banking app, and you will need to bring your bankbook to the branch to do any transactions.
I use a Fixed Deposit Account for saving up for my taxes. π