Currently have taken CPF Housing Loan. Can I pay more than my monthly installment as and when?

You can login using your Singpass to find out if u pay more (in blocks of SGD5K) how much interest you will save.

Or decide to change your cash repayment to a fixed higher amount monthly.

Not ad-hoc based on what you have leftover e.g. one mth +100, then next mth +200 definitely based on your cash on hand. Suggest you can save up monthly and do 1 time lumpsum at year end (at least 5K).

Hi, you may want to check out:

https://www.cpf.gov.sg/member/faq/home-ownershi...

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You definitely can use cash to pay off the HDB loan or do CPF refund (to reduce accrued interests).