Should You Pay Off Your Mortgage Early Or Invest? Here’s The Math On What’s Best



Paying off mortgage quickly can help save you thousands of dollars in interest. But before you start chucking money in that direction, you’ll need to consider a few things before deciding whether it’s a smart idea.

We’ll crunch some numbers and discuss whether it makes sense to use your extra cash to pay off mortgage early or to invest instead.

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Apply online to get a free recommendation with real rates and repayments.

How To Pay Off Your Mortgage (in 10 Years or Less)

Is this realistic, and is it possible given the standard mortgage term is 30 years?

Sure it is.

First, let’s come up with your typical Australian family: two adults and a kid.

You have a $500,000 mortgage on your home with an interest rate of 3% on a 30-year loan term.

  • You earn $100,000

  • Your spouse earns $60,000

  • Together you pay a combined tax of $36,784 and are left with $123,216 in disposable income, which is $10,268 per month.

Based on your level of income, we can expect total family expenses to be around $5000 per month, not including the mortgage repayments. (We got our numbers from the Australian Bureau of Statistics on Household income and expenditure.)

From our mortgage calculator, you’ll be able to work out the monthly repayment to be $2,108.

Now let’s crunch the numbers.

Cash FlowAmount
Net income after tax$10,268
Less: Monthly living expenses($5,000)
Less: Mortgage repayment($2,108)
Money leftover for 'extra' repayments$3,160
Transfer the entire $3,160 into your mortgage Redraw or Offset account every month (as Extra repayments), and you’re on your way to paying off your mortgage in 9 years 1 month, saving over $180,000 interest in the process!
monthly extra repayments

There’s nothing crazy about this.

You could pay off your mortgage even quicker by sticking to a budget plan. Reducing your monthly expenses from $5,000 to $4,000 and increasing your extra repayments by an additional $1,000 will help pay off the loan in 7 and a half years.

Paying off your mortgage is something we recommend, especially if it’s your primary place of residence, because you receive no tax deductions from the interest you pay on your owner-occupier mortgage.

Should You Pay Off Your Mortgage Early Or Invest

Why You Shouldn’t Pay Off Your Mortgage

“Pay off your loan quickly!” Or ,”Don’t pay off your loan!” Which is it?

While it’s advisable to pay off your owner occupied home loan as fast as possible, the case isn’t quite as clear cut for Investment property loans.

With investment assets, the Australian Tax Office (ATO) will allow you to claim all related expenses as a tax deduction, this includes investment properties, and it’s mortgage interest expense.

So if you paid $15,000 in investment interest this year, you’ll be able to claim the full amount against any taxable income you may have, such as your Rental income, Capital gains or your salary if working in Australia.

Right, so how does all this look like with real numbers?

Using the example above, $500,000 mortgage at 3% interest rate and rental income of $500/week.

annual cash flow summary
You would be making a rental income of $25,480 p.a. and some may think that income tax would be payable. However, the ATO allows you to claim all related expenses as a tax deduction, thereby reducing your taxable income to $1,951 (before tax depreciation).
annual tax position salary

After accounting for all the tax incentives (depreciation and write-offs), you end up in a negatively geared position, i.e. you pay no tax and instead, start accumulating ‘tax credits’.

Want your personalised cash flow and tax position analysis? Check out the ultimate investment property analysis tool.

The last point as to why you shouldn’t rush to pay off your investment mortgage is so you’ll have more cash in the piggy and the flexibility that comes with it.

If your investment interest rate is 3.5% and your Australian marginal income tax rate is at 32.5%, then we can calculate your effective rate of savings from you paying down your investment home loan.

By putting $10,000 into your investment mortgage, you may think you are saving 3.5% per year or $350 in interest, but on paper, you are only saving ((1 – 0.325) * 3.5%) = 2.36%, after you account for the loss of tax deduction.

So it’s a question of opportunity cost/trade-off.

If you believe you can make more than 2.36% (after-tax) with your money elsewhere, then you should reconsider paying down your investment mortgage.

One popular strategy is to still opt for Principal and Interest repayments (because P&I rates are about 0.20% lower than I/O rates) while using your Offset account as a place to hold your cash until a better investment opportunity arises.

An important note to make is that paying down the loan (investment or otherwise) carries almost no risk. Whereas if you intend to buy stocks with the expectation of 10-20% return, there’s most certainly risk involved. It’s a good idea to speak to your financial planner to discuss if it’s sensible before making any big decisions.

Summary: Pay Off Mortgage Early or Invest

Paying off your mortgage early can save you a great deal of money in the long run for relatively little risk. Even a small monthly contribution can allow you to own your property sooner.

However, it may not always be the best option if the mortgage relates to an Investment purpose, and further thought is required.

Regardless, it’s prudent to have an emergency fund before you put your money toward your home loan. Also, pay down your high-interest debts first (e.g. credit cards, personal loans) before you focus on your mortgage.

Making extra payments, refinancing, or switching your repayment schedule are all strategies that you can use to pay off your mortgage early if that is your goal.

Get a free Australian mortgage assessment today.

Apply online to get a free recommendation with real rates and repayments.
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