Best savings accounts for $100k
This guide calculates what a 30-year-old saver might see with $100,000 over 12 months, including accounts with standard monthly conditions. Use the Planner link to rerun it over 6 months.
By Savings Planner · Guide updated 22 Sept 2026 · Rates checked
Best setup for $100,000 over 12 months at a glance
As of 2 Oct 2026, the highest-return setup for $100,000 over 12 months in our dataset earns an estimated $5,775 in interest: $50,000 in BOQ Future Saver Account at an effective 5.80% p.a. (advertised 5.80% p.a.) and $50,000 in RACQ Bank Bonus Saver Account at an effective 5.75% p.a. (advertised 5.75% p.a.). Estimates assume a 30-year-old saver who meets every bonus condition for the full period.
| Bank | Product | Amount | Advertised rate | Effective rate | Estimated interest |
|---|---|---|---|---|---|
| BOQ | Future Saver Account | $50,000 | 5.80% p.a. | 5.80% p.a. | $2,900 |
| RACQ Bank | Bonus Saver Account | $50,000 | 5.75% p.a. | 5.75% p.a. | $2,875 |
$100k behaves differently from smaller balances
At $100,000, a headline rate can stop telling the full story. Some accounts only pay their best rate up to a cap, while others may look strong because of a short intro period. The useful comparison is the return on the full balance, not just the top advertised percentage.
That is why this page should be read as an allocation check as well as an account shortlist. If the calculated plan splits the balance, it is usually because the engine is trying to keep more of the money inside stronger tiers or away from weaker excess-balance rates.
When splitting $100k across banks is worth it
Splitting pays when the second account earns more on the overflow than the first account's excess-balance rate, after allowing for the admin of meeting two sets of monthly conditions. On $100,000 a 0.50 percentage point improvement on the whole balance is about $500 a year, so a well-chosen split can justify itself; a split that only lifts the rate on $10,000 usually cannot.
The calculated plans show what the engine would do with the current product data. Before copying a split, check that you can actually open each account, that the best rate applies to your balance band in each one, and that you are comfortable keeping both sets of rules every month. If not, the no-fuss $100k shortlist is the fallback.
Short-term parking still needs an exit plan
A 6-month setup can make a temporary intro rate worth considering, especially if you know the money will be moved or reassessed soon. The risk is treating that short-term result as if it still applies after the offer ends.
Before choosing, check whether the account remains competitive after 6 months, whether the whole $100,000 is rewarded, and whether the monthly conditions are realistic. If the balance may grow further, the $250k guide covers cap dilution and the Financial Claims Scheme limit.
Related guides
Best savings accounts for $250k and above
Best if your balance is large enough that setup and allocation matter more than a single product name.
No-fuss savings accounts for $100k over 12 months
Best if you want a simpler shortlist for the same balance without the monthly rules.
Best savings accounts for $50k
Best if your balance is closer to $50,000 and one account is more likely to be enough.
