HOMES AND MORTGAGES

Hi, My partner and I are about to debt recycle from our mortgage. We have a mortgage of 870k with 200k in offset. We would like to keep 50k cash and split our loan to have a 150k tax deductible portion invested in ETFs. We would like to invest $2000 per month after this. My question is would it be more beneficial to auto invest this or deposit into the non tax deductible loan to later split again and invest after the redraw reaches a substantial amount? Thanks!