The Finance Algorithm

Extra Repayment Calculator

See how extra repayments can save you thousands in interest and years off your loan

Updated October 2026Built and checked by MaverickHow it's calculatedReport an error

Your numbers

Updates as you type
$
$500k

Your current loan balance

%
6.8%

Defaults to the current average variable rate

25y
$
$500

How much extra you can put in per period

The button asks our AI to explain these figures in words.

Your extra repayment savings

Interest saved

$162,503

Time saved

6.5 years

78 months total

New loan term

18y 6m

vs 25 years

Effective return

7.9%

Tax-free equivalent

Two loans, two payoff paths

Top curve: standard schedule. Bottom curve: your accelerated schedule.

  • Original
  • With extra

Original schedule

$0k$123k$246k$369k$492kYr 1Yr 6Yr 11Yr 15Yr 20Yr 25

With your extra repayments

$0k$121k$243k$364k$486kYr 1Yr 6Yr 11Yr 15Yr 20Yr 25

What you'd pay in interest, before and after

The gap is your saving. Even small, regular extras add up over 25 to 30 years.

$541kWithout extra25y term$379kWith extra18y 6m term

What different extra-payment levels save

Fixed monthly extras at common levels: pick the one that fits your cash flow.

+$250$97k+$500$163k+$1000$246k+$2000$335k
By making extra repayments, you save $162,503 in interest and pay off your loan 6.5 years earlier. The effective tax-free return on those payments works out to 7.9%, about what you'd need to earn on investments after tax to match it.

How it works

Paying a bit more than the minimum is one of the simplest ways to cut what a home loan costs, because every extra dollar comes straight off the balance that's charged interest. Put in your loan and an extra amount to see the interest and the time it saves.

  1. 1Enter your current loan balance
  2. 2Input your interest rate
  3. 3Enter your remaining loan term
  4. 4Choose an extra repayment amount
  5. 5Select how often you'll make extra payments
  6. 6See your interest savings and time saved

The figures today

As of 7 November 2026, the lowest variable home loan rate is 5.93%, from SCCU's BROKER HOME LOAN, while the typical best across 104 institutions is 6.38%. The lowest 3-year fixed home loan rate is 6.24%, from Credit Union SA's 3-Year Fixed 40 Year Home Loan Package, while the typical best across 80 institutions is 6.69%. The RBA cash rate is 4.85%. Those are for an owner-occupier paying principal and interest at an 80% LVR.

Worked examples

Young Professional Building Wealth

Mei has a $450,000 loan at 6.2% over 28 years remaining. She puts $200 extra per month.

Loan amount
$450,000
Interest rate
6.2%
Remaining loan term (years)
28
Extra repayment amount
$200
Extra payment frequency
Monthly

Interest saved: $90,100. Loan paid off 4.3 years earlier. Over that time Mei pays $56,800 in extra repayments, which saves $90,100 of interest.

Using Annual Bonus

Stuart puts his $5,000 annual bonus directly onto his $600,000 mortgage at 6.5%.

Loan amount
$600,000
Interest rate
6.5%
Remaining loan term (years)
25
Extra repayment amount
$5,000
Extra payment frequency
Yearly

Interest saved: $140,300 over the life of the loan, and it's paid off 4.9 years earlier. The bonuses he puts in total about $100,400, so each dollar saves about $1.40 of interest.

Questions people ask

Are there limits on extra repayments?
Variable rate loans usually allow unlimited extra repayments. Fixed rate loans often cap them at a set amount a year or over the fixed term, and can charge break costs above it, so check your loan terms.
Should I pay extra or put money in an offset account?
Both achieve similar interest savings, but offset accounts offer more flexibility - you can access the funds if needed. Extra repayments into the loan can only be accessed via redraw (if available).
What's better - lump sum or regular extra payments?
A lump sum saves more interest overall because it reduces principal immediately. However, regular extra payments are more sustainable for most budgets and still save significant amounts.
Can I reduce my loan term instead of my repayments?
Yes. Many lenders let you keep the same repayment after rate drops, which acts as an extra payment. Or you can formally restructure to a shorter term for bigger savings.

The terms, in plain English

Redraw Facility
Allows you to access extra repayments you've made. Unlike offset, the money must be formally 'redrawn' and some lenders charge fees.
Break Costs
Penalties charged for exceeding extra repayment limits on fixed rate loans. Can be thousands of dollars.
Principal
Your original loan amount. Extra repayments reduce principal directly, meaning less interest is charged on the remaining balance.
Amortization
The process of paying off a loan through regular payments. Extra payments accelerate this process.

Official sources