Investing $500 a month in Singapore, compared with $100 or $1,000, changes three things: how much of each purchase goes on fees, what you can practically buy, and how quickly the sum grows. At S$100 a month, the fee rule on your plan matters most, because a minimum fee can take 1% to 5% of every buy. At $500 and $1,000, fees shrink as a share, and you have more room to choose and to spread your money.
Investing can lose money at any amount. This guide uses our own illustrations and does not recommend any product.
First, How Much Is Right?
The MAS and MoneySense Basic Financial Planning Guide suggests building an emergency fund of at least three to six months of expenses, then investing at least 10% of your income. On a take-home pay of $5,000, 10% is $500.
That is a guide, not a target everyone must hit. A smaller amount you keep up for years beats a bigger one you stop after six months.
Investing $100, $500 or $1,000 a Month: Fees Compared
Fees are charged on each purchase. Here is what three common fee rules cost at each amount. Illustration; check your own provider’s page.
| Monthly amount | $1 minimum fee | $5 minimum fee | 0.08% with no minimum |
|---|---|---|---|
| $100 | $1 (1%) | $5 (5%) | $0.08 (0.08%) |
| $500 | $1 (0.2%) | $5 (1%) | $0.40 (0.08%) |
| $1,000 | $1 (0.1%) | $5 (0.5%) | $0.80 (0.08%) |
Real examples as at November 2026: OCBC’s Blue Chip Investment Plan charges 0.3% or S$5 per counter, whichever is higher, for most customers, and a flat 0.88% for new customers under 30 on up to S$500 per counter. Tiger Brokers’ auto-invest for Singapore stocks lists a 0.03% platform fee with a S$1 minimum per order, plus SGX fees and GST.
Illustration only, not a guarantee. At an assumed 5% a year for 20 years:
- $100 a month grows to about $41,100. With a $5 fee taken from each buy, about $39,000.
- $500 a month grows to about $205,500. With a $5 fee, about $203,500.
- $1,000 a month grows to about $411,000. With a $5 fee, about $409,000.
The dollar cost of the $5 fee is the same at every level. As a share of what you end up with, it is five times heavier at $100 than at $500.
The short version: at $100 a month, pick a plan whose fee rule suits small amounts, and keep it to one broad holding. At $500, fees fall to a fraction of a percent on most plans and you can spread across two or three holdings. At $1,000, costs matter less per buy, but the habit and the mix still matter more than squeezing fees.
At $100 a Month
- Fees first. A plan with no minimum, or one that charges a percentage of your balance, keeps more of each $100 working. Our regular savings plans comparison lists how each plan charges.
- One holding is enough. Splitting $100 across three counters triples the minimum fees. A single broad fund already spreads your money across many companies; our ETF investing guide explains how.
- Plans start here. POSB’s Invest-Saver, OCBC’s plan and Phillip’s Share Builders Plan each start at S$100 a month.
- Consider buying less often. $300 every quarter pays a third of the minimum fees of $100 every month.
At $500 a Month
- Fees become small on most plans with a $1 minimum (0.2%), though a $5 minimum still takes 1%.
- Room for a mix. You could put part into a broad share fund and part into something steadier. MoneySense’s point on diversifying across assets starts to be practical.
- Savings Bonds become an option. MAS says Savings Bonds start at $500 in multiples of $500. Our Savings Bonds guide explains the $2 transaction fee and how the step-up return works. That is a guaranteed but lower return than the potential, non-guaranteed return of shares.
At $1,000 a Month
- Per-buy costs barely register with a $1 minimum (0.1%).
- More choice. At this level some people buy SGX-listed ETFs directly through a broker in board lots rather than through a plan. Our best brokers for ETFs page compares order costs.
- T-bills become possible for any cash portion: MAS sells them from $1,000, in multiples of $1,000.
- Concentration risk grows with the sum. A larger monthly amount poured into one or two shares concentrates more of your wealth. Spreading matters more, not less.
What Does Not Change With the Amount
- The emergency fund comes first. Our emergency fund calculator gives a target.
- The mechanism is the same. A fixed sum buys more units when prices are low; see our dollar-cost averaging guide.
- Time does most of the work. Starting at $100 and raising it with each pay rise is a common path.
Try your own amount and fee in the DCA vs lump sum calculator, or see long-term growth in the compound interest calculator.
What To Do Next
- Pick the amount you can sustain through a bad year, then work out its fee as a percentage on your shortlisted plans.
- Keep holdings few at small amounts; add more only when fees allow.
- Review the amount once a year, for example after a pay rise or bonus.
- Do your own due diligence: read the product highlights sheet, and check the provider in the MAS Financial Institutions Directory.
