Savings Account Effective Interest Calculator

What an "up to X%" savings account really pays on your balance, after tiers, caps and conditions.

Your Account

Balance you keep in the account

Base rate

% a year

Paid on every dollar, whatever you do.

Months a year you meet the ticked conditions

of 12

Miss a month and that month's bonus is usually lost.

Bonus Conditions Or Tiers

Take these from the bank's terms. Use one row for each bonus condition, or for each balance tier. Leave a row at 0 to skip it. The figures shown are made up.

Row 1: Salary credit

Applies to balance from

Up to

Bonus rate on that part

% a year

I meet this condition

Row 2: Card spend

Applies to balance from

Up to

Bonus rate on that part

% a year

I meet this condition

Row 3: Balance growth

Applies to balance from

Up to

Bonus rate on that part

% a year

I meet this condition

Row 4: Insurance or investment purchase

Applies to balance from

Up to

Bonus rate on that part

% a year

I meet this condition

Row 5: Spare row

Applies to balance from

Up to

Bonus rate on that part

% a year

I meet this condition

Your effective interest rate–

The "up to" rate if every condition is met: –
Estimated interest in a year: –
From the base rate: –
From bonus rates: –
Balance earning only the base rate: –
Interest if you met every condition all year: –

How Your Balance Is Split

Your balance is above $100,000. Deposit insurance covers Singapore-dollar deposits up to $100,000 per depositor at each Scheme member, counting all your accounts with that bank.

Why The "Up To" Rate Is Rarely What You Earn

A bonus-interest account is built in layers. A small base rate is paid on the whole balance. Each bonus rate is switched on by a condition, such as crediting your salary or spending on a card, and usually applies only to the first part of your balance. Money above that cap earns the base rate alone.

Your effective rate is the interest you would really earn in a year divided by your balance. It falls below the advertised figure when you miss a condition, when you miss a month, or when part of your balance sits above the cap.

Stacked conditions go in as separate rows covering the same part of the balance. Balance tiers go in as rows that sit side by side, for example the first $50,000 and then the next $50,000. A bonus is only worth having if meeting the condition costs you less than it earns.

Assumptions And Limits

Every rate, balance band and condition is typed in by you from your own account's terms. The starting figures are invented for illustration and are not any bank's rates.
Simple annual interest on a steady balance. Real accounts usually work on the daily or average daily balance and credit interest monthly, so your statement will differ a little.
A ticked condition is treated as met for the number of months you enter, and the base rate is paid on the whole balance all year.
Ignores the cost of meeting a condition, such as moving card spending or buying a product to qualify, and any fall-below or early closure fees.
Singapore-dollar deposits are insured up to $100,000 per depositor per Deposit Insurance Scheme member. This tool does not check that limit for you.

This calculator was built with AI tools from published rules and may contain errors. Results are estimates for education only, not financial advice and not a guarantee. Rates and rules change; confirm with the official source before you act. Your figures stay in your browser: nothing you type is sent to us.

Your Account

Bonus Conditions Or Tiers

Row 1: Salary credit

Row 2: Card spend

Row 3: Balance growth

Row 4: Insurance or investment purchase

Row 5: Spare row

How Your Balance Is Split

Why The "Up To" Rate Is Rarely What You Earn

Assumptions And Limits

Sources