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Lump sum repayment calculator

Use our simple calculator to work out how much you can save by making a lump sum repayment on your home loan.

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If you make a large, one-off extra repayment (a lump sum) to your mortgage you can reduce your debt and the time it takes to pay it off. This means you end up paying less interest in the long run too. Our lump sum repayment calculator is an easy tool that lets you estimate how much a lump sum repayment can save you in time and interest.

Use the calculator below or learn how it works. We've also provided some tips on how to make extra mortgage repayments (a lump sum repayment might not even be the most effective way to do it).

How to use the lump sum calculator

In order to use a lump sum calculator you’ll need the following details:

  • Your loan amount. This is the amount of money you borrowed.
  • The loan term. This is the length of your home loan. Most Australians choose between 20 and 30 year loan terms.
  • The interest rate. The loan's interest rate affects how much interest you pay every month.
  • The repayment frequency. Repayments can be weekly, fortnightly, or monthly, depending upon your agreement with your lender.
  • Lump sump repayment. Enter the single amount you wish to add to the loan as a lump sum repayment.
  • Lump sum made at year. This refers to when you make the lump sum repayment. If you're two years into your loan, select 2 years.

Once you input all of the necessary information into the calculator you'll be able to see the results right away and figure out if putting a lump sum toward your mortgage will be worth it in terms of savings. Usually a lump sum payment will go toward your principal more so than interest, which will help you pay down your loan faster than just making general repayments.

Case study

Susan just inherited $10,000 unexpectedly. She decides to take some of it and pay a lump sum toward her mortgage. In order to figure out exactly what a lump sum will do for her mortgage she uses a lump sum calculator.

Susan opens the loan calculator and then enters in her information into the designated fields. Susan inputs her original loan amount, $300,000. She then inputs her interest rate (5.5%), her loan term (20 years) and her repayment frequency (monthly).

Susan then has to input her lump sum information. She is looking to put down $10,000 and has had her mortgage for two years. According to the calculator, Susan has been making monthly payments of $2,063.66 a month and has a remaining balance of $282,571 after two years. If she were to put a lump sum of $10,000 toward her loan she’ll save $16,141 on interest and take a year off her loan.

An alternative to making a lump sum repayment is an offset account

If you have come into a large sum of money you don't have to throw it straight into your home loan. If your home loan has an offset account you save the money in the account and you'll enjoy a similar benefit to the lump sum repayment but with greater flexibility.

An offset account is a bank account connected to your home loan. Any money that you save in it temporarily reduces (or offsets) your loan principal. This means your repayments stay the same but you're paying less interest and therefore pay off the whole loan faster.

This is the same benefit as a lump sum repayment but with one huge difference. Once you pay the lump sum into your home loan it's gone. Your lender may let you access some of it via a redraw facility but it's their money now.

With an offset account you still retain total control over the cash while receiving the same benefit. So if you suddenly need some money to cover an urgent expense it's right there. It's the best of both worlds.

However, if your loan doesn't have an offset account and you're confident you won't need the lump sum again any time soon then simply throwing it into your home loan is not a bad idea. Getting out of debt faster is always wise.

Compare home loans from across the market

Data indicated here is updated regularly
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Loan purpose
Offset account
Loan type
Repayment type
Your filter criteria do not match any product
Name Product Interest Rate (p.a.) Comp Rate^ (p.a.) Application Fee Ongoing Fees Max LVR Monthly Payment Short Description
St.George Basic Home Loan - LVR 60% to 80% (Owner Occupier, P&I)
2.54%
2.56%
$0
$0 p.a.
80%
Up to $4,000 refinance cashback. A competitive variable rate loan from St.George. Refinancers borrowing $250,000 or more can get $4,000 cashback (Other terms, conditions and exclusions apply).
UBank UHomeLoan Variable Rate - Discount Offer for Owner Occupiers, Variable P&I Rate
2.49%
2.49%
$0
$0 p.a.
80%
Enjoy flexible repayments, a redraw facility and the ability to split your loan. Plus, pay no application or ongoing fees.
Athena Celebrate Home Loan - 60% LVR  Owner Occupier, P&I
2.34%
2.34%
$0
$0 p.a.
60%
Owner occupiers with 40% deposits or equity can get this competitive variable rate loan. No upfront or ongoing fees.
Westpac Flexi First Option Home Loan - Basic Variable Rate (Owner Occupier, P&I)
2.29%
2.72%
$0
$8 monthly ($96 p.a.)
95%
Up to $3,000 refinance cashback.
A flexible and competitive variable rate loan. Eligible borrowers refinancing $250,000 or more can get $2,000 cashback per property plus a bonus $1,000 for their first application. Other conditions apply.
homeloans.com.au Low Rate Home Loan with Offset - LVR Under 60% (Owner Occupier, P&I)
2.29%
2.31%
$0
$0 p.a.
60%
A competitive rate with no application or ongoing fee. This loan is not available for construction.
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Logo for Westpac Flexi First Option Home Loan - Basic Variable Rate (Owner Occupier, P&I)
Westpac Flexi First Option Home Loan - Basic Variable Rate (Owner Occupier, P&I)

Up to $3,000 refinance cashback. A flexible and competitive variable rate loan. Eligible borrowers refinancing $250,000 or more can get $2,000 cashback per property plus a bonus $1,000 for their first application. Other conditions apply.

Logo for St.George Basic Home Loan - LVR 60% to 80% (Owner Occupier, P&I)
St.George Basic Home Loan - LVR 60% to 80% (Owner Occupier, P&I)

Up to $4,000 refinance cashback. A competitive variable rate loan from St.George. Refinancers borrowing $250,000 or more can get $4,000 cashback (Other terms, conditions and exclusions apply).

Logo for Athena Liberate Home Loan - 70% to 80% LVR Owner Occupier, P&I
Athena Liberate Home Loan - 70% to 80% LVR Owner Occupier, P&I

A competitive variable rate mortgage for owner occupiers $0 application and $0 ongoing fees. This interest rate falls over time as you pay off the loan.

Logo for UBank UHomeLoan Variable Rate - Discount Offer for Owner Occupiers, Variable P&I Rate
UBank UHomeLoan Variable Rate - Discount Offer for Owner Occupiers, Variable P&I Rate

Take advantage of a low-fee mortgage with a special interest rate of just 2.49% p.a. and a 2.49% p.a. comparison rate.

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2 Responses

  1. Default Gravatar
    garethJuly 8, 2013

    hi, we are about to receive a 100k lump sum we have two home loans on the one property 213k at 5.45% and 129k at 5.69% also a 7k personnel loan at 16.4%. into which loan(s) should we place the money

    • Avatarfinder Customer Care
      ShirleyJuly 9, 2013Staff

      Hi Gareth,

      Thanks for your comment.

      Since finder.com.au is a comparison website we’re not licensed to give any personalised financial advice. You may want to consider speaking to a financial advisor.

      Cheers,
      Shirley

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