Debt-to-Income Ratio in Singapore: 5 Mistakes to Avoid
Shows what share of income goes to debt. The maths is not complicated, but a handful of errors come up again and again in this and related loans & finance calculations. Here is what to watch for.
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.
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.
1. Ignoring fees
Processing fees, platform fees and early repayment penalties reduce real returns.
2. Mixing monthly and annual rates
Divide annual rates by 12 for monthly calculations and keep periods consistent.
3. Comparing flat rates with effective rates
A 3% flat rate can be close to 5.5% effective because interest is charged on the original amount for the whole term.
4. Paying only the minimum on a card
Minimum payments barely cover interest, so balances can take years to clear.
5. Using unrealistic returns
Projecting 10% a year for decades can make goals look easy; test lower rates too.
The correct method
DTI = monthly debts ÷ monthly income × 100.
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%
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.
The Debt-to-Income Ratio Calculator applies the formula consistently, so it is a quick way to double-check your own working.
Run your own numbers: Debt-to-Income Ratio Calculator