There's no tax on CPF. You referring to income tax? Then it's a recurring arrangement, auto tax repayment every year.
When I saw the title "CPF Tax payment" I was wondering whether it was some sort of clickbait/trolling post.... it certainly made me click![]()
I also kena ....zzzz ...
So you mean interest free? Yes, monthly installment repayment of income tax is interest free.

only for first year
or forever?![]()
