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The Total Debt Servicing Ratio (TDSR) dictates that your total monthly repayments for all loans, including your home loan, car loan, and other debts, must not exceed 60% of your gross income. Given your combined income of $15,000 per month, your TDSR limit would be $9,000 per month.
You mentioned a $900 car loan, so you would need to subtract this from your TDSR limit, leaving you with $8,100 per month for other debt repayments, including your home loan.
Assuming a 30-year loan tenure and an interest rate of around 4%, you can estimate your maximum loan amount. Using affordability calculators available on EdgeProp, you can determine that with a monthly repayment of approximately $4,819 (as an example), your maximum loan amount would be around $1,009,332.
You would need to consider the down payment, which is typically 25% of the purchase price for private properties, and other costs such as stamp duties and legal fees.
Given these considerations, your maximum affordability for a property would be around $1.36 million, assuming you use all your cash proceeds from the sale of your current HDB and other available funds for the down payment.