Discover how much interest you save by making extra repayments. Compare fortnightly vs monthly payment strategies for Australian home loans.
📖 10 min read · ⏱️ Calculator time: ~30 seconds
| Scenario | Payoff date | Total interest |
|---|
Estimates only — figures depend on your lender's exact calculation method. Confirm with your lender before relying on any figure.
See how a rate change would affect your repayment and payoff date — try a rate rise or a rate cut.
Compare staying on your current rate vs refinancing to a new rate (keeping the same extra repayments).
Remaining balance over time — standard repayments vs your extra repayments/lump sum/offset scenario combined.
A mortgage payoff calculator models how extra repayments, lump sums, offset balances and repayment frequency changes affect your loan — showing the new payoff date, total interest saved, and time saved compared with paying only the minimum required amount. It's the fastest way to see whether a change to your repayment habits is actually worth it before you commit to it.
Australian home loans charge interest daily on your outstanding balance, then debit it to your account (usually monthly). This means every dollar you pay off the principal — whether through a scheduled repayment, an extra repayment, or a lump sum — reduces the interest charged from that day forward, for the rest of the loan. The earlier in the loan you reduce the balance, the more total interest you avoid, because there's more time remaining for that saving to compound.
Beyond the direct interest savings, an early payoff reduces the total risk you're carrying — less debt means more resilience to rate rises, job changes or unexpected expenses — and frees up your future cash flow years sooner than your original loan term. On a $600,000 loan at 6.25% over 30 years, paying just $500 extra per month saves over $140,000 in interest and cuts the loan term by nearly 8 years. Most Australian variable-rate home loans allow unlimited extra repayments without penalty.
Paying fortnightly (half the monthly repayment every 2 weeks) results in 26 half-payments per year = 13 full payments, instead of 12. This effectively makes one extra monthly payment per year and can save tens of thousands in interest over the life of a loan.
Paying off your home loan early can save tens of thousands to hundreds of thousands of dollars in interest, depending on your loan size and how much extra you contribute. The key is that every dollar of extra repayment reduces the principal — and a lower principal means less interest charged every single day thereafter.
| Extra Monthly Payment | Years Saved | Interest Saved | New Payoff Date |
|---|---|---|---|
| $0 (minimum only) | — | — | 30 years |
| $100/month | ~2 years | ~$42,000 | ~28 years |
| $250/month | ~4 years | ~$92,000 | ~26 years |
| $500/month | ~7 years | ~$163,000 | ~23 years |
| $1,000/month | ~11 years | ~$235,000 | ~19 years |
| $2,000/month | ~16 years | ~$315,000 | ~14 years |
Switching from monthly to fortnightly repayments is one of the easiest and most effective mortgage strategies. There are 26 fortnights in a year but only 12 months — so making half your monthly payment every fortnight means you make the equivalent of 13 monthly payments instead of 12. That one extra payment per year goes entirely toward principal.
| Repayment Frequency | Annual Payments Made | Equivalent Monthly Payments | Effect |
|---|---|---|---|
| Monthly ($3,792) | 12 × $3,792 = $45,504 | 12 | Standard |
| Fortnightly ($1,896) | 26 × $1,896 = $49,296 | 13 | ~$3,792 extra per year |
Both strategies reduce the interest you pay, but they work differently. Extra repayments directly reduce your loan balance and the interest is calculated on the lower balance immediately. Offset account balances reduce your loan balance for interest calculation purposes only — the money stays in your account, fully accessible.
A lump sum — an inheritance, bonus, tax refund, or proceeds from selling an asset — can be applied directly to your mortgage for an immediate, permanent reduction in your balance. Because interest is calculated daily on the outstanding balance, a lump sum paid early in the loan has a much bigger lifetime impact than the same amount paid later, since it stops accruing interest sooner and for longer. Use the "Lump sum payment" field in the calculator above to see the effect of applying one today.
A redraw facility lets you withdraw extra repayments you've made above the minimum required amount, giving you a safety net without giving up the interest-saving benefit in the meantime. Redraw sits inside the loan itself (unlike an offset account, which is a separate linked transaction account), and some lenders cap the amount or number of redraws, or charge a small fee per withdrawal. For investment properties, redrawing funds for a private purpose can affect the tax-deductibility of the loan's interest — offset is usually the safer structure for investors who may need to access funds.
Extra repayments, lump sums and offset accounts generally work freely on variable rate loans. Fixed rate loans are more restrictive: most lenders cap extra repayments at a set amount per year (commonly $10,000–$30,000) before break costs apply, and fixed loans typically don't offer a 100% offset account at all. If you're on a fixed rate and want to pay down your mortgage faster, check your specific extra-repayment cap first — exceeding it can trigger the same break costs as paying out the loan early.
On a variable rate loan, you can pay off the mortgage at any time without penalty. On a fixed rate loan, paying off the loan early — or making repayments above the allowed extra repayment limit — typically triggers a break cost (also called an Early Repayment Adjustment or ERA). Break costs are calculated based on the difference between your contracted fixed rate and current wholesale rates and can range from zero to tens of thousands of dollars. Always request a written break cost estimate from your lender before paying out a fixed loan early.
Refinancing to a lower rate and making extra repayments aren't mutually exclusive — many borrowers do both. Refinancing reduces your rate (and therefore your minimum repayment), while extra repayments attack the principal directly regardless of rate. If your current lender won't move on rate, refinancing to a competitive offer and then redirecting the repayment saving into extra repayments on the new loan often beats staying put and paying extra alone — just weigh any refinancing costs (discharge fees, new establishment fees, LMI if your equity has changed) against the projected saving first.
Take a $550,000 loan at 6.25% with 25 years remaining. Paying only the minimum, the loan runs its full term with total interest well into six figures. Add $500/month in extra repayments and the picture changes substantially: the loan finishes roughly 6 years sooner and total interest drops by well over $100,000 — figures the calculator above computes precisely for your own balance, rate and term. Add a $20,000 offset balance on top and the payoff date moves forward again, since interest is now calculated on a lower effective balance every single day.
| Term | Meaning |
|---|---|
| Principal | The amount you actually owe, excluding interest. |
| Offset account | A linked transaction account whose balance reduces the interest charged on your loan. |
| Redraw | Access to extra repayments already made, held within the loan itself. |
| Lump sum | A one-off large payment applied directly to the loan balance. |
| Break cost | A fee for exiting or over-paying a fixed rate loan early. |
| Amortisation | The gradual reduction of a loan balance through scheduled repayments. |
| Mortgage freedom | The point at which your home loan balance reaches zero. |
Paying off your mortgage sooner comes down to a small number of levers — extra repayments, lump sums, an offset account, and repayment frequency — and the calculator above lets you test all of them together against your actual loan. Even a modest, sustainable extra repayment compounds into a substantial saving over 20-30 years, and combining it with an offset account or a switch to fortnightly repayments pushes your mortgage-free date forward further still. Recheck your numbers periodically as your rate and balance change, and pair this calculator with our Mortgage and Borrowing Power calculators for the complete picture of your home loan.
How can I pay off my Australian mortgage faster?
The most effective strategies are: make fortnightly repayments instead of monthly (saves ~5 years on a typical $600k loan), make regular extra repayments whenever possible, use a 100% offset account to reduce daily interest, round up repayments to the nearest $50 or $100, and put any windfalls (tax refunds, bonuses) directly against the loan.
Does paying extra on a mortgage reduce interest?
Yes, directly and immediately. Every extra dollar paid reduces the outstanding principal, which reduces the daily interest charged from that day forward. Even small additional payments made consistently have a compound effect over 20-30 years. $200/month extra on a $600,000 loan at 6.5% saves approximately $42,000 in total interest.
Can I make fortnightly repayments on my Australian mortgage?
Yes. Most Australian home loans allow fortnightly repayments. You pay half your monthly amount every two weeks, which results in 26 half-payments (equivalent to 13 monthly payments) rather than 12 — one extra full payment per year that goes entirely to principal.
What is mortgage redraw and how is it different from offset?
A redraw facility lets you access extra repayments you've made — the money is technically part of the loan balance until you redraw it. An offset account is a separate linked bank account where your balance reduces your loan for interest purposes while remaining fully accessible. For investors, offset is preferable because redrawn funds used for personal purposes can reduce investment loan deductibility.
Is there a penalty for paying off a mortgage early in Australia?
Variable rate loans generally have no early repayment penalty. Fixed rate loans typically charge break costs if you repay more than the permitted extra amount or pay out the loan before the fixed term ends. Break costs vary from zero to tens of thousands depending on market rates — always get a written estimate before proceeding.
How much interest can I actually save?
It depends on your balance, rate, remaining term and how much extra you pay — but even modest amounts add up substantially. On a $600,000 loan at 6.5%, $250/month extra saves roughly $92,000; $500/month saves roughly $163,000. Enter your own figures in the calculator above for a precise estimate.
Should I make extra repayments on my mortgage?
For most owner-occupiers, yes — mortgage interest isn't tax-deductible, so paying it down is effectively a guaranteed, risk-free return equal to your interest rate. The main exceptions are if you're on a fixed rate with a low extra-repayment cap, or if you'd rather build an emergency fund or invest for a potentially higher return first.
Should I use an offset account instead of extra repayments?
Both produce the same interest saving for the same dollar amount. The difference is accessibility: offset funds remain fully liquid, while extra repayments become part of your loan balance (accessible again only via redraw, if your loan has one). If you might need the money, offset is generally the safer choice.
Offset vs redraw — which should I use?
They produce a similar interest benefit, but offset sits in a separate, instantly accessible account, while redraw funds are inside the loan and can be slower to access or capped by your lender. For investment properties, offset is usually preferred since redrawing for personal use can affect interest deductibility.
Can I make lump-sum repayments on my mortgage?
Yes — most Australian variable rate loans accept lump sum payments at any time with no penalty, applied directly against your balance. On fixed rate loans, a large lump sum can exceed your extra repayment cap and trigger break costs, so check your loan's specific limit first.
Weekly vs fortnightly repayments — which saves more?
Both produce a very similar result, since each converts to the equivalent of one extra monthly repayment per year compared with paying strictly monthly. Fortnightly is the more common option offered by lenders; use the Weekly vs Fortnightly vs Monthly panel in the calculator above to compare your own numbers.
Can I repay a fixed-rate mortgage early?
Yes, but most fixed loans cap extra repayments at a set amount per year (often $10,000-$30,000) before break costs apply, and paying out the entire loan early almost always triggers a break cost. Always get a written break cost estimate from your lender first.
What are mortgage break fees and when do they apply?
Break costs (Early Repayment Adjustments) apply on fixed rate loans when you repay more than the permitted extra amount, or pay out the loan, before the fixed term ends. They're based on the gap between your fixed rate and current wholesale rates, and can range from zero to tens of thousands of dollars.
How do Australian banks calculate mortgage repayments?
Banks use a standard amortisation formula based on your loan balance, interest rate and remaining term, which spreads principal and interest across equal instalments so the loan is fully repaid by the end of the term. Interest itself is calculated daily on the outstanding balance and typically debited monthly.
Can I pay my mortgage weekly instead of monthly?
Most Australian lenders offer weekly repayments. Like fortnightly, weekly repayments (calculated as roughly a quarter of your monthly amount, paid 52 times a year) result in slightly more paid annually than strictly monthly repayments, cutting your term and interest.
Does refinancing help me pay off my mortgage faster?
It can, especially combined with extra repayments — a lower rate from refinancing reduces your minimum repayment, and redirecting that saving into extra repayments on the new loan accelerates payoff further. Weigh any discharge, establishment or LMI costs against the projected saving first.
Can I shorten my loan term instead of making extra repayments?
Yes — asking your lender to formally shorten your loan term increases your minimum required repayment to match, achieving a similar result to voluntary extra repayments but with less flexibility to scale back if your circumstances change. Voluntary extra repayments generally offer more control.
Should I invest my spare money or pay off my mortgage?
This depends on your risk tolerance and expected investment return versus your mortgage rate. Paying down the mortgage is a guaranteed, tax-free "return" equal to your interest rate, since the interest isn't deductible for owner-occupiers. Investing can outperform over the long run but carries risk — many people do both, using an offset account to keep flexibility while they decide.
Can I redraw extra repayments if I need the money back?
Yes, if your loan has a redraw facility — extra repayments above the minimum are generally accessible again, though some lenders cap the amount or number of redraws, or charge a small fee. Confirm your loan's specific redraw terms with your lender.
How accurate is this mortgage payoff calculator?
It uses standard Australian amortisation formulas and is a solid planning estimate for variable rate loans. Actual figures can vary slightly based on your lender's exact interest calculation method, fees, and any rate changes over the life of the loan — always confirm with your lender before making major decisions.
How does an offset account reduce interest?
The balance in a linked offset account is subtracted from your loan balance before interest is calculated each day. A $600,000 loan with a $40,000 offset balance is charged interest on $560,000 only, while the $40,000 remains fully accessible — unlike a direct extra repayment.
What happens to my extra repayment plan if interest rates increase?
A rate rise increases your minimum required repayment, which can eat into the "extra" amount you were paying voluntarily. It's worth revisiting the calculator above after any rate change to see how your payoff date and interest saved are affected, and adjust your extra repayment amount if needed.
Can I pay off my mortgage before I retire?
Often, yes, with a deliberate extra repayment strategy started early enough — use the calculator above with your target retirement date to see what extra monthly amount or lump sum would get you there, and revisit it periodically as your income and balance change.
Do extra repayments reduce my minimum required repayment?
No — on most Australian loans, your scheduled minimum repayment stays the same even as extra repayments reduce your balance faster. The benefit shows up as a shorter loan term and less total interest, not a lower minimum repayment, unless you specifically ask your lender to recalculate it.
Is it better to make one big lump sum or regular extra repayments?
A lump sum paid today has an immediate effect, while regular extra repayments compound over time. For the same total dollar amount, paying it as early as possible (whether as a lump sum or front-loaded extra repayments) generally saves slightly more interest, since it reduces the balance sooner.
Does the order of extra repayments and offset matter?
Combining both gives the largest benefit, since offset reduces daily interest while extra repayments and lump sums reduce the principal permanently. The calculator's Offset Account Comparison panel isolates how much of your saving comes specifically from the offset balance.
Will my lender automatically apply extra repayments to reduce my term?
Yes, on most standard Australian home loans — extra repayments reduce the balance and the loan finishes early, while your scheduled repayment amount and frequency stay the same unless you ask the lender to recalculate.
What's the minimum extra repayment worth making?
There's no real minimum — even $20-$50 extra per fortnight adds up meaningfully over 20-30 years due to compounding daily interest. Rounding your repayment up to the nearest $50 or $100 is a common, low-effort way to start.