Minimum Average Daily Balance (Singapore Bank Accounts)
The hidden threshold that triggers a monthly fall-below fee at DBS, OCBC and UOB — and how it’s actually calculated.
Minimum average daily balance (ADB) is the threshold a bank sets for the average of your account balance across every day in a statement cycle; falling below it triggers a monthly “fall-below fee”, distinct from a simple minimum balance measured on a single day.
Not financial advice. All figures for educational reference only. Data as at July 2026.
Last updated: July 2026
Key Takeaways
- Average daily balance (ADB) is calculated by summing your account balance at the end of every day in the month and dividing by the number of days, not by checking your balance once.
- OCBC is raising its fall-below fee from S$15 to S$20 per month effective 1 May 2026 for accounts that dip under their ADB threshold.
- DBS commonly waives its monthly account fee only once your average daily balance reaches a set amount, such as S$10,000 for some account tiers.
- Business accounts often carry much higher ADB thresholds than personal accounts — UOB eBusiness, for example, requires around S$5,000 from the account’s second year onward.
- A single large withdrawal near month-end can drag your average down even if your balance was healthy for most of the month, because ADB is a time-weighted average, not a snapshot.
What Is Minimum Average Daily Balance?
Many Singapore bank accounts, particularly basic savings accounts and some business current accounts, waive their monthly service fee only if the customer maintains a minimum average daily balance across the statement period. This is different from a simple “minimum balance” requirement checked once a month or once a quarter: ADB is calculated by summing the account’s closing balance at the end of every calendar day in the cycle, then dividing by the number of days in that cycle.
The distinction matters in practice. A customer who keeps S$10,000 in an account for 29 days of a 30-day month, then withdraws it all on the last day, still has a very high average daily balance for that month — roughly S$9,667 — even though their end-of-month balance is S$0. Conversely, a customer who starts the month at S$0, deposits S$10,000 on the 29th day, and holds it through month-end has a much lower average daily balance of only about S$667, despite ending the month with a much healthier headline balance than in the first scenario.
Banks in Singapore use ADB thresholds primarily on legacy basic savings accounts (rather than the newer high-interest “bonus” savings accounts, which typically use tiered interest instead of fall-below fees) and on many SME/business current accounts, where balance requirements can run into the thousands of dollars.
How Does It Work in Singapore?
The mechanics differ slightly by bank, but the general formula is:
Average Daily Balance = (Sum of end-of-day balances for every day in the cycle) ÷ (Number of days in the cycle)
If the resulting figure falls below the bank’s published threshold for that account type, a flat monthly “fall-below fee” is charged, typically debited automatically in the following statement cycle. This fee is separate from, and usually smaller than, monthly account-keeping fees some business accounts also charge.
Representative 2026 thresholds and fees for illustration:
- OCBC Business Growth Account: S$1,000 ADB threshold; fall-below fee rising from S$15 to S$20/month from 1 May 2026.
- UOB eBusiness Account: S$5,000 ADB threshold from the account’s second year onward (lower or waived in year one for new accounts).
- DBS personal/business accounts: some tiers waive the monthly account fee only once ADB reaches S$10,000; below that, a flat monthly fee (commonly around S$40 for certain business accounts) applies.
Most banks compute and display this figure automatically on the monthly e-statement, and some internet banking dashboards show a running “average balance so far this month” indicator, which is worth checking mid-cycle if you are close to the threshold and planning a large withdrawal.
Minimum Average Daily Balance Example
Priya runs a small business account with a S$1,000 ADB threshold and a S$20 fall-below fee. Her daily closing balances for a 30-day month look like this: S$3,000 for the first 20 days, then a large supplier payment drops her to S$200 for the remaining 10 days.
- Sum of daily balances: (S$3,000 × 20) + (S$200 × 10) = S$60,000 + S$2,000 = S$62,000.
- Average daily balance: S$62,000 ÷ 30 = S$2,066.67.
- Since S$2,066.67 is above the S$1,000 threshold, no fall-below fee applies this month, even though her balance was very low for a third of the month.
If instead Priya had started the month at S$200 and only received a large payment on day 25, her average daily balance could easily fall below S$1,000, triggering the fee despite a much higher balance for most of the month by the time she checks her statement — which is exactly why ADB catches people who only glance at their balance occasionally rather than tracking it daily.
Advantages
Rewards consistent balance-holding, not just a single snapshot. Because ADB averages across the whole cycle, a temporary dip that is quickly restored has less impact than a sustained low balance.
More forgiving than a strict daily minimum. Some account structures overseas require the balance to never dip below a threshold on any single day; Singapore’s ADB approach allows short-term dips as long as the average holds up.
Predictable, published thresholds. Because ADB requirements and fall-below fees are published in each bank’s fee schedule, businesses and individuals can plan cash-flow buffers around them.
Often avoidable entirely. Many digital banks (GXS Bank, Trust Bank, MariBank) and newer high-yield savings accounts do not use ADB/fall-below fee structures at all, giving fee-averse customers an alternative.
Risks and Limitations
Easy to miscalculate mentally. Because ADB is a time-weighted average rather than a snapshot, it is easy to underestimate how much a large withdrawal near month-start (versus month-end) will drag the average down.
Fees are creeping up. OCBC’s move to raise its fall-below fee from S$15 to S$20/month from May 2026 illustrates that these fees are not static and tend to rise over time.
Compounds across multiple accounts. A business or household with several accounts, each carrying its own ADB threshold, can accumulate several fall-below fees in a single month if cash is spread thin across accounts rather than consolidated.
Higher thresholds for business accounts. SME owners sometimes discover, only after their promotional first-year waiver ends, that maintaining a S$5,000+ average balance is a real ongoing cash-flow constraint.
Interacts poorly with bonus-interest savings accounts. Sweeping funds out of a basic account into a higher-interest account to chase yield can inadvertently push the basic account below its ADB threshold, triggering a fee that offsets the extra interest earned elsewhere.
Harder to monitor across joint or business signatories. When multiple people can withdraw from the same account, it becomes easier for one signatory’s withdrawal to unknowingly drag the average daily balance below the threshold without the others realising until the fee is charged.
Average Daily Balance vs Simple Minimum Balance
| Feature | Average Daily Balance (ADB) | Simple Minimum Balance |
|---|---|---|
| How it’s measured | Time-weighted average across every day in the cycle | Single balance check, usually end-of-month |
| Impact of a mid-month dip that recovers | Reduces the average, but may not breach the threshold | No impact, since only the end-of-month figure counts |
| Impact of a large withdrawal just before month-end | Can significantly lower the average if it was low all month | Can trigger the fee even after a strong month, since only the final snapshot matters |
| Common use in Singapore | Basic savings accounts, many SME/business current accounts | Some fixed deposit or promotional account tiers |
| Ease of avoiding the fee | Requires tracking balance trend across the month | Only requires topping up before the check date |
Source: OCBC, UOB, DBS published fee schedules, as at Jul 2026.
The Bottom Line
Minimum average daily balance is a quieter, more forgiving cousin of a simple minimum-balance rule, but it still catches people who assume a healthy end-of-month figure is all that matters. Anyone paying a monthly account fee in Singapore is worth checking whether it is ADB-based, what the threshold and fee actually are in 2026, and whether switching to a fee-free digital bank or high-yield account removes the constraint entirely.
Frequently Asked Questions
How is average daily balance calculated in Singapore?
It is the sum of your account’s end-of-day balance for every day in the statement cycle, divided by the number of days in that cycle — not a single-point-in-time check.
What happens if my average daily balance falls below the threshold?
Most Singapore banks charge a flat monthly fall-below fee, commonly in the S$15-S$40 range depending on the bank and account type.
Is OCBC really raising its fall-below fee in 2026?
Yes, OCBC’s Business Growth Account fall-below fee is set to rise from S$15 to S$20 per month effective 1 May 2026.
Do all Singapore savings accounts use ADB fall-below fees?
No. Many newer high-yield savings accounts and digital banks like GXS Bank, Trust Bank, and MariBank do not charge fall-below fees at all, using tiered interest structures instead.
Can I avoid the fee by topping up right before month-end?
Not reliably — because ADB averages across the whole month, a single top-up near month-end may not be enough to pull the average above the threshold if the balance was low for most of the cycle.