Probably not worth to top up CPF if you are all in to investment except for emergency funds.
but if you hoard cash, cpf maybe worth to top up because eventually you can withdraw the amount beyond frs which means you can get the money back (assume that one will hit frs just by working). So you ‘earn’ tax relief and interest.
Top up medisave, MA money overflow to OA. Use OA to pay mortgage. Get tax relief for paying mortgage, no money trapped in CPF.
