Buying a home is a dream for many, but the most common question is: "How much house can I actually afford?" Applying for a mortgage (KPR) without understanding your financial capacity is a recipe for stress.
To ensure your home remains a blessing and not a financial burden, you need to calculate your affordability using the same logic banks use. Here is a step-by-step guide to calculating your mortgage limit based on your salary.
1. The 30% Golden Rule
Most financial planners and banks suggest that your total monthly debt obligations—including your future mortgage, car loans, and credit cards—should not exceed 30% to 35% of your gross monthly income.
The Formula:
$\text{Max Monthly Installment} = \text{Gross Monthly Salary} \times 30\%$
Example: If you and your spouse have a combined joint income of Rp 20.000.000, your maximum monthly mortgage payment should be around Rp 6.000.000.
2. Consider the "Interest Rate Buffer"
Mortgage rates in Indonesia often come with a "Fixed Rate" for the first 2–5 years, followed by a "Floating Rate." In 2026, it is vital to calculate your affordability based on the floating rate (which is usually higher), not just the promo rate. If you can only afford the promo rate, you might struggle when the interest adjusts upward later.
3. The Down Payment (DP) Factor
The larger your Down Payment, the smaller your loan principal, and the lower your monthly installments. Currently, many developers offer 0% DP programs, but keep in mind that this results in much higher monthly payments. Aiming for a 10% to 20% DP is still the safest way to reduce your long-term interest costs.
4. Factor in "Hidden" Transaction Costs
Don't mistake your savings for your DP. You must set aside extra cash (usually 7% to 10% of the property price) for:
BPHTB (Land and Building Acquisition Tax)
Notary Fees and Deed of Sale (AJB)
Bank Provision Fees and Mortgage Insurance
5. Use the Debt-to-Income (DTI) Ratio
Banks look at your DTI to approve your loan. If you already have a car loan of Rp 2.000.000 and your salary is Rp 10.000.000, your remaining "debt space" is only Rp 1.000.000 (30% limit).
Strategy: Clear your small debts (credit cards/paylater) at least 6 months before applying for a mortgage to improve your credit score and increase your loan limit.
Mortgage Affordability Estimation Table (Estimation Only)
Assumes a 20-year tenor with an average interest rate of 8-9%
| Monthly Salary | Safe Installment (30%) | Estimated Loan Amount |
| Rp 10,000,000 | Rp 3,000,000 | ~ Rp 330,000,000 |
| Rp 20,000,000 | Rp 6,000,000 | ~ Rp 670,000,000 |
| Rp 50,000,000 | Rp 15,000,000 | ~ Rp 1,600,000,000 |
Final Thought
Before falling in love with a house, fall in love with your spreadsheet. Knowing your numbers gives you the power to negotiate and the peace of mind to enjoy your new home without worrying about the next paycheck.