Should I invest now or pay off my home first? It's a perennial question for would-be investors. - Michel Carman
IS IT better to pay off your home loan first and then invest in property, or should you invest while paying off your home loan?
There are valid concerns either way.
Paying off your home loan first means you can use the full amount of equity in your place of residence, which will likely have appreciated and which is unencumbered by any mortgage. After the mortgage is paid off there's also greater cash flow that can be used to service the loans for investment properties.
On the other hand, waiting until the loan on your own home is paid off before you start investing means there's potentially a lot of lost time where investment properties could be appreciating in your portfolio but aren't. In other words, you only have one property - your principal place of residence - growing in value when you could potentially have several others also building wealth for you. 
Needless to say there are many other considerations that play into this decision including:
- Your income level - and at what rate it grows - which impacts how quickly you could pay down the loan on your own home.
- How easily (or otherwise) you qualify for property loans, at what cost, and using what loan criteria.
- The rate at which property values grow.
- Rents and rental yields, and their rate of growth.
Because so many specific factors come into play it's risky to look at the issue too prescriptively or generally. Instead we'll look here at a case study and see what works out best with some specifics. The results may surprise you.
OUR CASE STUDY: JOHN
For our analysis we'll study the case of John, who's in his 30s and currently earns a salary of $100,000 per year.
Here are the other vital statistics for our made-up case study:
- John's salary grows at 3 per cent per year.
- His living expenses (excluding housing) are $25,000 per year and these also grow at 3 per cent per annum.
- His annual tax bill, including the Medicare levy, is $27,500 and we assume that this average tax rate (i.e. 27.5 per cent) holds every year.
- Interest rates remain constant at 8 per cent per annum.
- His principal place of residence is purchased for $300,000, with a 20 per cent ($60,000) deposit he has saved up.
- The loan for his own home is a principal-and-interest loan, while loans for investment properties are interest-only.
To make the situation more realistic, rather than assuming that property prices rise at a constant rate of, say 8 per cent per year, we've constructed a makeshift property cycle by which property prices in the case study appreciate.
Figure 1 shows the cycles and values used for both property prices and rents: the property cycle is an adaptation of the property cycle of the weighted average of Australian capital cities seen between 1986 and 2005. 
These property and rental movements give rental yields at purchase of between 2.6 and 4 per cent.
Although his own home costs $300,000 now, the properties John eventually accumulates as investments are less expensive: worth $270,000 now. His principal place of residence (PPOR) and investment properties appreciate at the same rate, as shown in Figure 1.
To map how he accumulates properties we apply a loan-servicing rule that John's total loan repayments must be lower than the sum of 30 per cent of his gross salary and 80 per cent of his rental income after any acquisitions are made. This sets the limit on the rate at which he can accumulate investment properties.
Let's see how John fares over a 15-year period under two different scenarios: when he pays off his principal place of residence before investing versus investing while he is paying off his own home.
SCENARIO 1: PAYING OFF THE HOME LOAN FIRST
Under this scenario John's aim is to pay off his home loan and he does this aggressively by taking out a 25-year principal-and-interest loan. The annual repayments on this loan are around $22,300. After he pays his tax and living expenses he has cash left over (free cash) of roughly $25,000 in the first year (although this increases in successive years as his wages grow) and he applies this to his home loan. So John is paying more than twice as much as he is actually required to pay off his home loan.
Because the interest on the loan is calculated on the outstanding balance, applying extra cash to the loan consistently in this way whittles it away very quickly so it's paid out substantially ahead of time.
What's fascinating to note is how quickly John is able to pay off his home loan in this way: after seven years in fact! (See Figure 2). 
The rapid pay-down of principal reduces the interest payable, in turn allowing more funds to be dedicated to the repayment of principal, in one of those virtuous circles of compounding that has great power for investors and wealth creators.
John doesn't acquire any investment properties until the loan on his PPOR is paid off. Figure 3 shows his asset position and his borrowings over the 15-year period.
As soon as his own home is paid off John buys his first investment property in the eighth year. Applying our (reasonably stringent) debt-servicing rule he acquires his next investment property in year 13: the jumps in the asset value and borrowing bars in Figure 3 show when John makes his acquisitions.
John's net worth climbs steadily throughout, reaching $1.3million in the 15th year. Not a bad effort from a diligent pay-down of home loan debt and a consistent investing program. In the same way as he used spare cash to pay down the loan on his PPOR John uses his spare cash to offset his investment property loans in a line of credit arrangement, although of course the cash loss from his investment properties reduces the amount of cash used in this way.
SCENARIO 2: INVESTING BEFORE THE HOME LOAN IS PAID OFF
Instead of taking out a 25-year home loan, in scenario 2 John takes out a 30-year home loan so that his yearly repayments are lower (because they're spread out over a longer period of time - an extra five years). Rather than paying $22,300 per year in home loan payments he now pays $21,130.
The big surprise is that there's hardly any difference between this scenario and the first one. This is because the impost of paying off the home loan on the PPOR acts as a brake on the borrowing capacity needed to enable investment properties to be acquired. Because John still has surplus cash available that's not going towards investments he uses it to pay down his home loan - after all, if he's keen to invest what else is he going to use it for?
Figure 4 shows the results. The number of investment properties acquired over the 15-year period is the same as in scenario 1 (i.e. two investment properties) and these are acquired in the same time frame. John's net worth is just under $1.3million - almost the same as when he aimed to pay off his home loan first.
Although his home loan repayments are lower in scenario 2, because John has extra cash available that's not used elsewhere and he puts these funds towards his home loan, the net effect is the same in terms of paying down the mortgage on the PPOR. 
SUMMING UP
The major lesson this potted example provides is the way a home loan impacts on an investor's borrowing capacity. Your capacity to raise funds for investing and to service the debt is a critical factor determining the rate at which you can accumulate properties and build wealth. In our case study John has a sizeable amount of spare cash after housing costs and living expenses - more than $25,000 per year - but even that kind of cash isn't enough to support both a home mortgage and an investment, using the lending criteria we applied here. Of course, some lenders are more lenient than others and have less stringent lending criteria, and that will have a major impact too, as will the point in the property cycle at which you are ready to buy: if prices are only growing slowly they'll be more affordable and you'll be able to accumulate earlier.
Another thing to bear in mind is there are other possibilities that parlay into the decision. You could, for example, live in rented accommodation while investing, then use the equity from your investments as security for the purchase of your own home.
What is clear though, whichever strategy you choose, is that you understand your borrowing capacity and use it to accumulate property equity, whether you buy your home first or invest first.
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