What Is a High Interest Savings Account?

A high interest savings account (HISA) is a savings account that pays a significantly higher rate than a standard bank savings account. In Australia, the headline rates on the best accounts can be five to ten times what a basic savings account pays. But there's almost always a catch: the top rate is conditional.

Base Rate vs. Bonus Rate

Nearly every high interest savings account in Australia has two rates: a base rate and a bonus rate.

The base rate is what you earn regardless of what you do. It's typically low — sometimes under 1% — and reflects what the bank pays when you haven't met any conditions.

The bonus rate is what you earn on top of the base rate when you meet the account's conditions for that month. The advertised headline rate is almost always the combined base + bonus rate. So when you see a bank promoting a 5% savings account, that figure usually assumes you've met every condition every month.

Common Bonus Conditions

Every bank has its own rules, but the most common bonus conditions you'll encounter are:

• Minimum monthly deposit: Deposit a set amount each month — often $1,000 or $2,000 — from an external source. A transfer from another account at the same bank often doesn't count.
• No withdrawals: Don't make any withdrawals during the calendar month. Even one ATM withdrawal can forfeit the bonus for that month.
• Balance growth: Your balance at the end of the month must be higher than at the start. This means depositing more than you withdraw — useful if you're actively saving, but tricky if you need to access funds.
• Minimum transactions: Some accounts require a linked transaction account to have a certain number of purchases per month (typically five or more).

The complexity varies a lot between accounts. Some have one simple condition; others stack several. It's worth reading the full product disclosure statement, not just the headline rate.

Introductory (Honeymoon) Rates

Some banks offer a higher bonus rate for new customers during an introductory period — typically three to four months. After the intro period ends, the rate drops to the standard bonus rate, which is usually lower.

If you're comparing accounts, always check whether the advertised rate is an ongoing rate or a honeymoon rate. A 5.65% intro rate that drops to 4.50% after four months is a different product to one paying 5.10% indefinitely.

Intro rates can be worth chasing — but you need to track when they expire and be ready to switch or renegotiate.

How They Differ from Term Deposits

A high interest savings account is flexible — you can deposit and withdraw freely (within the bonus conditions). A term deposit locks your money away for a fixed period in exchange for a guaranteed rate.

The trade-off: savings accounts give you access but require ongoing effort to earn the top rate. Term deposits are set-and-forget but inflexible. Many savers use both — a savings account for funds they may need, and term deposits for money they're confident they won't touch.

What Actually Matters When Comparing

• Ongoing rate, not intro rate: Focus on what you'll earn after any honeymoon period.
• Achievability of conditions: Can you realistically meet the conditions every month given how you use money?
• Base rate fallback: If you miss a condition one month, what do you actually earn?
• Account and app quality: You'll likely need a linked transaction account. Is it one you'd actually use?

This is general information, not financial advice. The right account depends on your financial habits and goals.

Before opening an account, compare the ongoing bonus rates and read the conditions carefully. A higher headline rate with complex hoops can easily lose to a lower rate with simple, achievable conditions.