How to Calculate Debt-to-Income Ratio in Singapore: A Step-by-Step Guide
Shows what share of income goes to debt.
Interest rates, instalments and returns compound over years, so a small difference in rate or tenure turns into thousands of dollars. Working the numbers out yourself makes it easier to compare bank offers, avoid expensive debt and plan savings goals.
What you need
- Monthly debt payments (S$)
- Gross monthly income (S$)
Step by step
- Enter the monthly debt payments (S$).
- Enter the gross monthly income (S$).
- The results update as you type, or press Calculate.
- Read the debt-to-income ratio first, then the supporting figures below it.
The formula
DTI = monthly debts ÷ monthly income × 100.
Worked example
For example, with these inputs:
- Monthly debt payments (S$): 2,200
- Gross monthly income (S$): 7,000
the calculator returns:
- Debt-to-income ratio: 31.43%
A second example
Now change the inputs to:
- Monthly debt payments (S$): 2,750
- Gross monthly income (S$): 7,000
the calculator returns:
- Debt-to-income ratio: 39.29%
Practical tips
- Even small monthly contributions grow meaningfully over 20 years because of compounding.
- Use realistic return assumptions; long-term projections at high rates can be very misleading.
- Factor in inflation when you plan for goals that are many years away.
- Compare loans by effective interest rate, not flat rate; the EIR is roughly double the flat rate.
Background
An emergency fund of three to six months of essential expenses protects you from having to borrow at high rates when something unexpected happens. Once that buffer is in place, extra savings can go towards longer-term goals and investments.
Compounding is the reason long-term saving works: returns earn further returns, so the growth curve steepens over time. The same maths works against you with debt, which is why credit card balances at around 27% a year grow quickly if only minimum payments are made.
Interest in Singapore is quoted in several ways. Mortgages and savings accounts use effective annual rates, while car loans and many personal loans are advertised at flat rates that look much lower than their true cost. Banks must disclose the effective interest rate, and comparing on that basis gives a fair picture.
Related calculations
- Inflation Calculator: Shows how inflation changes prices and purchasing power.
- Fixed Deposit Calculator: Calculates interest on a Singapore fixed deposit, which typically pays simple interest at maturity.
- Dividend Yield Calculator: Calculates dividend yield for SGX stocks and REITs.
- Break-Even Calculator: Finds how many units you must sell to cover costs.
Want to skip the arithmetic? The free Debt-to-Income Ratio Calculator does all of this instantly and updates as you type.
Run your own numbers: Debt-to-Income Ratio Calculator