AusTax Loan Tools Stage 2 of 4: Stress

Extra repayment calculator

Turn surplus cashflow into faster payoff with a plan you can sustain.

Payoff acceleration

Extra repayment mortgage calculator

Set recurring extra repayments and compare how quickly your loan timeline and interest profile change.

Inputs

Snapshot

Loan amount

$720,000

LVR

80.00%

Monthly repayment

$4,663

Total interest

$693,112

Estimated payoff

25.33 yrs

Years saved

4.67 yrs

Interest saved vs baseline

$157,627

Payoff years saved vs baseline

4.67 yrs

Amortization preview

First 18 periods

Period 1

$4,663Interest $3,660 | Principal $1,003Balance $718,997

Period 2

$4,663Interest $3,655 | Principal $1,008Balance $717,989

Period 3

$4,663Interest $3,650 | Principal $1,013Balance $716,975

Period 4

$4,663Interest $3,645 | Principal $1,019Balance $715,957

Period 5

$4,663Interest $3,639 | Principal $1,024Balance $714,933

Period 6

$4,663Interest $3,634 | Principal $1,029Balance $713,904
PeriodPaymentInterestPrincipalBalance
1$4,663$3,660$1,003$718,997
2$4,663$3,655$1,008$717,989
3$4,663$3,650$1,013$716,975
4$4,663$3,645$1,019$715,957
5$4,663$3,639$1,024$714,933
6$4,663$3,634$1,029$713,904
7$4,663$3,629$1,034$712,870
8$4,663$3,624$1,039$711,830
9$4,663$3,618$1,045$710,786
10$4,663$3,613$1,050$709,736
11$4,663$3,608$1,055$708,680
12$4,663$3,602$1,061$707,620
13$4,663$3,597$1,066$706,554
14$4,663$3,592$1,072$705,482
15$4,663$3,586$1,077$704,405
16$4,663$3,581$1,082$703,323
17$4,663$3,575$1,088$702,235
18$4,663$3,570$1,093$701,141

Goal-gradient momentum

Visible payoff progress increases consistency. Small, repeatable extra repayments often beat occasional large bursts.

Compounding discipline

Early principal reduction has outsized impact. Timing matters as much as amount in long-term interest outcomes.

Regret-safe strategy

Choose extra repayments that survive budget variability. Unsustainable targets can backfire and reduce confidence.

Decision thresholds for extra repayment plans

Green

Extra amount is stable across months and still leaves emergency buffer intact.

Amber

Plan is achievable in normal months but fragile under expense spikes. Reduce target slightly for consistency.

Red

Extra repayment depends on optimistic assumptions. Rework budget before committing to automation.

Compare against offset strategy

Check whether keeping liquidity in offset beats direct extra repayment for your profile.

Stress-test under higher rates

Validate that your extra repayment plan still works in +1% and +2% scenarios.

Align plan with quote features

Confirm your chosen loan product supports the repayment behavior you plan to execute.

Consistency wins

The best extra repayment plan is the one you can repeat for years.

Use this calculator to set a realistic recurring amount, then pressure-test it against rate and cashflow changes.

Run rate stress test

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Borrowing Power

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FAQs

How much difference do extra repayments make?

Even moderate recurring extra repayments can materially reduce total interest and payoff years, especially earlier in the loan.

Should I do extra repayments or keep cash in offset?

Extra repayments reduce principal directly, while offset preserves liquidity. Compare both based on flexibility needs and fee structure.

Can I use this for weekly and fortnightly plans?

Yes. The calculator supports monthly, fortnightly and weekly frequencies for scenario comparison.