Do I get higher interest in my DBS Multiplier Account if my salary is credited to another DBS/POSB account under the same name?

Yes, so long as your salary transaction code is ‘SAL’ or ‘PAY’, it will be eligible for the higher interest rate regardless of account. However, the interest earned is calculated based on the multiplier balance. So make sure the bulk of your cash is kept there!

Also yes to your second question. So long as its a new set up (i.e you set up the invest saver after opening the multiplier account). Do note that this investment criteria is only valid for 12-months.