ROI in Singapore: 5 Mistakes to Avoid
Measures the return on an investment as a percentage. 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.
Inflation erodes buying power, so a savings goal set in today's dollars needs to be adjusted upwards for the years it will take to reach it. Singapore's core inflation has varied widely over the past decade, so it is worth testing a range of rates.
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. Only looking at the monthly payment
A longer tenure lowers the instalment but raises the total interest paid.
2. 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.
3. Ignoring fees
Processing fees, platform fees and early repayment penalties reduce real returns.
4. Using unrealistic returns
Projecting 10% a year for decades can make goals look easy; test lower rates too.
5. Mixing monthly and annual rates
Divide annual rates by 12 for monthly calculations and keep periods consistent.
The correct method
ROI = (return − cost) ÷ cost × 100.
For example, with these inputs:
- Amount invested (S$): 10,000
- Amount returned (S$): 12,500
the calculator returns:
- Profit: S$2,500.00
- Return on investment: 25.00%
Related calculations
- Maximum Car Loan Calculator: MAS rules cap car loans at 70% of the price if OMV is S$20,000 or less, and 60% if OMV is higher, with a maximum tenure of 7 years.
- Additional Registration Fee (ARF) Calculator: Calculates the tiered ARF for cars registered in Singapore.
- Car Depreciation Calculator: Works out the yearly depreciation buyers in Singapore use to compare used cars.
- Loan Calculator: Calculates repayments for an amortising loan.
The ROI Calculator applies the formula consistently, so it is a quick way to double-check your own working.
Run your own numbers: ROI Calculator