How to Calculate Maximum Loan Amount Based on Your Income

Maximum loan amount refers to the highest principal a Singapore-based lender will approve for a borrower, determined by a formula combining income multiples, Total Debt Servicing Ratio (TDSR) thresholds, and credit history. As of 2026, the Monetary Authority of Singapore (MAS) caps TDSR at 55% of gross monthly income for most property loans, meaning a borrower earning SGD 10,000/month cannot commit more than SGD 5,500 to total monthly debt obligations. For unsecured loans, the maximum is capped at 12 times monthly income under the Credit Bureau of Singapore (CBS) guidelines. This framework applies to Singapore Citizens, Permanent Residents, and Employment Pass (EP) holders alike, though EP holders face additional restrictions such as a maximum loan tenure of 30 years for housing loans. Understanding these limits prevents over-leverage and rejection.

The Core Formula: Income Multiple × TDSR × Interest Rate

The standard calculation for maximum loan amount starts with gross monthly income multiplied by an income multiple set by the lender. For housing loans, banks typically use a multiple of 4 to 5 times annual income. For example, a borrower earning SGD 120,000/year (SGD 10,000/month) can expect a maximum loan of SGD 480,000 to SGD 600,000 under this single metric.

However, the TDSR rule overrides this: total monthly debt payments—including the new loan—cannot exceed 55% of gross income. Using SGD 10,000/month income, the TDSR ceiling is SGD 5,500. If existing debts (car loan, credit card minimums) total SGD 1,500, only SGD 4,000 remains for the new loan’s monthly installment. Assuming a 4.0% interest rate and 25-year tenure, SGD 4,000/month supports a loan of approximately SGD 758,000. The lender then applies the lower of the two calculations: SGD 600,000 (income multiple) vs. SGD 758,000 (TDSR-based), yielding a maximum of SGD 600,000.

TDSR Calculation: Step-by-Step with Real Numbers

To compute TDSR accurately, list all monthly debt obligations. As of 2026, MAS requires banks to include credit card minimum payments (typically 3% of outstanding balance), car loans, student loans, and existing mortgages. For instance, a borrower earning SGD 8,000/month has existing debts: car loan SGD 800, credit card minimum SGD 200, and personal loan SGD 300, totaling SGD 1,300. The TDSR limit is SGD 8,000 × 55% = SGD 4,400. Available for new loan installment: SGD 4,400 – SGD 1,300 = SGD 3,100.

Using a 4.5% interest rate (current average for HDB loans in Q1 2026) and 30-year tenure, SGD 3,100/month supports a loan of approximately SGD 610,000. However, if the borrower’s income multiple is 4.5× annual income (SGD 96,000/year × 4.5 = SGD 432,000), the lower figure (SGD 432,000) becomes the maximum. This demonstrates why income multiple often acts as the binding constraint for high-income earners with low debt.

Income Multiple Variations by Loan Type

Loan type dictates the income multiple applied. For HDB housing loans in 2026, the Housing & Development Board uses a 4.0× annual income multiple, with a maximum loan-to-value (LTV) ratio of 80% for first-timers. For private property loans, banks commonly apply 4.5× to 5.0×, but only after TDSR compliance. For unsecured personal loans, the MAS caps the multiple at 12× monthly income for borrowers earning at least SGD 30,000/year, but this shrinks to 6× for lower incomes.

Example: A borrower earning SGD 5,000/month (SGD 60,000/year) qualifies for a personal loan of up to SGD 60,000 (12× monthly income). However, if the borrower’s CBS credit score is below 1,800 (out of 2,000), the bank may reduce this to 8×, yielding only SGD 40,000. Credit score directly impacts the effective multiple, with a 10% penalty for scores under 1,600 as per OCBC’s 2026 underwriting guidelines.

Impact of Interest Rate Stress Testing

MAS requires lenders to conduct interest rate stress testing for housing loans, assuming a 3.5% floor rate or the prevailing rate plus 1.5%, whichever is higher. As of January 2026, the average 3-month SORA is 2.8%, so the stress rate is 2.8% + 1.5% = 4.3%. This means the TDSR calculation uses a higher hypothetical interest rate to ensure borrowers can withstand rate hikes.

Consider a borrower with SGD 12,000/month income, no existing debt. At a 4.3% stress rate and 30-year tenure, the maximum monthly installment from TDSR (SGD 12,000 × 55% = SGD 6,600) supports a loan of SGD 1,340,000. But at the actual rate of 2.8%, the same installment supports SGD 1,580,000. The lender caps the loan at SGD 1,340,000 due to stress testing. This reduces borrowing capacity by 15% compared to non-stressed calculations.

CBS Credit Score and Its Effect on Maximum Amount

The Credit Bureau of Singapore (CBS) score, ranging from 1,000 to 2,000, directly influences the maximum loan amount. A score above 1,900 qualifies for the highest income multiple and lowest interest rates. Data from Experian Singapore (2026) shows that borrowers with scores above 1,900 receive an average 0.5% rate discount compared to those with scores of 1,600–1,700.

For a SGD 200,000 personal loan over 5 years, a 1,900-score borrower at 5.5% pays SGD 3,820/month, while a 1,600-score borrower at 6.0% pays SGD 3,867/month—a difference of SGD 47/month. More critically, banks may reduce the income multiple by 1× for scores below 1,500, cutting maximum loan from SGD 60,000 to SGD 45,000 for a SGD 5,000/month earner. Credit score maintenance is therefore essential for maximizing borrowing capacity.

Special Rules for EP Holders and Foreigners

Employment Pass (EP) holders face stricter limits. As of 2026, MAS guidelines cap EP holder housing loans at 55% TDSR, same as citizens, but with a maximum tenure of 30 years (vs. 35 for citizens). Additionally, EP holders must have a minimum remaining pass validity of 3 years for loan approval, per DBS’s policy. For unsecured loans, EP holders are limited to 6× monthly income (half the citizen limit) unless they have a Singapore Permanent Resident spouse as a co-borrower.

Example: An EP holder earning SGD 15,000/month seeks a personal loan. The maximum unsecured loan is SGD 90,000 (6×), compared to SGD 180,000 for a citizen earning the same. For a housing loan, assuming SGD 15,000 income, no debt, and 4.0% rate over 30 years, the TDSR limit of SGD 8,250/month supports SGD 1,720,000—but the 30-year tenure constraint reduces this to SGD 1,580,000 compared to SGD 1,720,000 for a citizen with 35-year tenure. Pass validity also matters: loans above SGD 500,000 require at least 4 years remaining on the EP.

Practical Example: Calculating for a SGD 8,000/Month Earner

Let’s apply the formula to a real scenario. Borrower profile: Singapore Citizen, age 35, gross monthly income SGD 8,000, existing car loan SGD 600/month, credit card minimum SGD 150/month, CBS score 1,850, seeking a private property loan at 4.0% interest over 25 years.

1. Income multiple: Annual income SGD 96,000 × 4.5 (bank’s multiple) = SGD 432,000.
2. TDSR calculation: TDSR limit = SGD 8,000 × 55% = SGD 4,400. Existing debts = SGD 600 + SGD 150 = SGD 750. Available for new loan = SGD 4,400 – SGD 750 = SGD 3,650/month. At 4.0% over 25 years, SGD 3,650/month supports SGD 690,000.
3. Stress test: At 4.3% (stress rate), SGD 3,650/month supports SGD 660,000.
4. Credit score adjustment: Score 1,850 qualifies for full multiple, no reduction.
5. Final maximum: Lower of SGD 432,000 (income multiple) and SGD 660,000 (stress-tested TDSR) = SGD 432,000.

The borrower can thus borrow up to SGD 432,000. If the property costs SGD 600,000, they need SGD 168,000 down payment (28% of price), aligning with the 25% minimum cash down payment rule for private properties in 2026.

FAQ

Q1: What is the maximum loan amount for a personal loan if I earn SGD 4,000/month as an EP holder?

For EP holders, the maximum unsecured loan is 6× monthly income, so SGD 4,000 × 6 = SGD 24,000. However, this is subject to TDSR: total monthly debt payments cannot exceed 55% of income (SGD 2,200). If you have no existing debt, a 12-month loan at 7% interest would require SGD 2,078/month, which is under SGD 2,200, so the full SGD 24,000 is possible. But if you have a car loan of SGD 500/month, available capacity drops to SGD 1,700/month, supporting only SGD 19,600. Additionally, your CBS score must be above 1,600; otherwise, the multiple may drop to 4×, yielding SGD 16,000. Always check your pass validity—loans above SGD 20,000 require at least 3 years remaining on your EP.

Q2: How does the TDSR limit affect refinancing an existing home loan?

Refinancing requires recalculating TDSR with the new loan’s monthly installment. As of 2026, MAS does not exempt refinancing from TDSR. If your current loan is SGD 300,000 at 3.5% over 20 years (installment SGD 1,740/month) and your income is SGD 6,000/month with no other debt, TDSR is SGD 1,740 / SGD 6,000 = 29%, well under 55%. Refinancing at a lower rate of 2.8% over 20 years reduces installment to SGD 1,630/month, improving TDSR to 27.2%. However, if you have new debts (e.g., a car loan of SGD 500/month), TDSR becomes (SGD 1,630 + SGD 500) / SGD 6,000 = 35.5%, still under 55%. The maximum loan for refinancing is capped at the existing outstanding amount plus up to SGD 100,000 for cash-out, subject to TDSR.

Q3: Can I increase my maximum loan amount by adding a co-borrower?

Yes, adding a co-borrower—typically a spouse or family member—combines both incomes for TDSR calculation. For example, if you earn SGD 7,000/month and your spouse earns SGD 5,000/month, combined income is SGD 12,000. TDSR limit becomes SGD 12,000 × 55% = SGD 6,600. If combined existing debts are SGD 1,000, available for new loan is SGD 5,600/month. At 4.0% over 30 years, this supports SGD 1,170,000. Without the co-borrower, your solo income of SGD 7,000 would support only SGD 680,000. However, the co-borrower’s CBS score must be above 1,700 for full benefit; a score below 1,500 may reduce the combined multiple by 0.5×. Also, the co-borrower’s existing debts are included in the calculation.

References

• Monetary Authority of Singapore, 2026, MAS Notice 632: Total Debt Servicing Ratio Framework
• Credit Bureau of Singapore, 2026, CBS Credit Score Guidelines for Unsecured Loans
• Housing & Development Board, 2026, HDB Loan Eligibility and Income Ceiling Rules
• DBS Bank, 2026, Mortgage Underwriting Criteria for Foreigners and EP Holders
• Experian Singapore, 2026, Credit Score Impact on Loan Pricing in Singapore