First Home Super Saver Mistakes Australians Make and How to Avoid Them

Updated 27 July 2026 · Property and home loans

A First Home Super Saver Calculator gives a fast answer, but the answer is only as good as what goes in. These are the mistakes we see most often with first home super saver calculations in Australia, and how to avoid them.

1. Assuming prices always rise

Property growth varies by location and period. Plan for flat or falling prices too.

2. Borrowing the maximum

Lenders test you at a higher rate, but your budget still needs room for rate rises, repairs and life changes.

3. Forgetting purchase costs

Stamp duty, conveyancing, inspections and moving can add several percent to the price.

4. Comparing headline rates only

Fees, offset accounts and flexibility on extra repayments can matter as much as the rate.

5. Overlooking the detail that matters most here

You can contribute up to $15,000 a year and $50,000 in total. Apply for a determination before signing a contract.

How the estimated benefit changes with marginal rate incl. Medicare

A common mistake is getting one input slightly wrong. Here is what happens to the estimated benefit when “Marginal rate incl. Medicare (%)” is off by up to 20% in either direction, with everything else held steady.

Marginal rate incl. Medicare (%)	Estimated benefit
26	$1,650.00
29	$2,100.00
32	$2,295.00
35	$2,362.50
38	$2,430.00

At 26 the result is $1,650.00; at 38 it is $2,430.00. If a small change in this input moves the answer a lot, it is worth double-checking that figure before you rely on the result.

A quick sense check

Contributions are taxed at 15% going in. On release they are taxed at your marginal rate less a 30% offset. The result is compared with saving after tax. With typical inputs the calculator returns estimated benefit of $2,295.00. If your own result looks wildly different, check that each figure is in the right unit and period (weekly, monthly or yearly) before drawing conclusions.