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The TDSR is 60%, meaning that the total debt repayments (including the housing loan, car loan, credit cards, etc.) should not exceed 60% of the individual's gross income.
For HDB loans, the MSR is 30%, which means that the monthly mortgage repayment should not exceed 30% of the gross income.
Assuming the individual has no other significant debts and is eligible for the maximum MSR of 30%:
Typically, HDB loans have a maximum tenure of 25 years, and the interest rate is around 2.6% per annum for HDB Concessionary Loans.
In addition to the loan amount, you need to consider other costs such as the down payment, CPF usage, and other fees associated with buying an HDB flat.
Given these calculations, an individual with a salary of $9,000 per month could potentially afford an HDB flat priced around $600,000 to $650,000, assuming a significant down payment and other costs are managed within the overall financial plan.