There are 3 extra factors you should consider when calculating TDSR. First, banks implement a “stress test” to make sure that your repayment must still be within TDSR constraints even if interest rates rise to 3.5%. Second, if you are a self-employed individual and have variable income rather than a fixed one, your income will be reduced by 30% in the calculation. Third, for a joint application, an income-weighted average age (IWAA) of both borrowers will be used when calculating maximum loan tenure.