Most return measures look at a single year, or ignore when money actually moves. The internal rate of return — IRR — does neither. It is the annualised rate of return that accounts for every cash flow across the whole life of an investment, and critically, when each of those cash flows happened.
A dollar of rent received this year is worth more than a dollar received in ten years, because you could reinvest it in the meantime. IRR bakes that principle — the time value of money — directly into a single percentage you can compare against any other investment.
What IRR actually represents
Think of a property investment as a timeline of cash flows: a large negative amount at the start (your deposit and costs), a series of smaller amounts each year (net rent, positive or negative), and a large positive amount at the end (the sale proceeds after paying off the loan).
The intuition
The rate that makes all cash flows net to zero
IRR is the single annual growth rate that, applied to every cash flow across the holding period, exactly balances what you put in against what you took out. If the IRR is 9%, the investment behaved as though your money grew at 9% a year, compounding.
Why timing matters
Earlier cash flows carry more weight
Two properties can return the same total dollars, but the one that returns cash sooner has the higher IRR. Because IRR discounts later cash flows more heavily, it rewards investments that pay you back faster.
A worked example
You invest $150,000 of your own cash to buy a property. Over five years it produces modest net cash flow of about $4,000 a year, and at the end of year five you sell, walking away with $210,000 after clearing the loan. Adding up the raw dollars makes the deal look simple — but IRR weaves the deposit, the five years of rent, and the final sale into one figure.
In this case the IRR works out to roughly 10.5% a year. That single number lets you compare this property directly against a share portfolio, a term deposit, or another property with a completely different cash flow shape.
IRR vs a simple total return
A simple return divides total profit by total cash invested and, optionally, by the number of years. It is easy to calculate but blind to timing — it treats a dollar earned in year one exactly the same as a dollar earned in year ten.
IRR is harder to compute (it's solved by iteration, not a single division) but far more honest. For a buy-and-hold property with income arriving every year and a lump sum at sale, IRR is the metric that captures the real, time-weighted performance of the investment.
Things to watch with IRR
- It's sensitive to the exit assumption — the sale price and date you assume at the end can swing the IRR dramatically. Always sense-check the growth assumption behind it.
- It says nothing about scale — a 15% IRR on $50,000 invested builds less wealth than a 9% IRR on $500,000. Read it alongside the dollars, not instead of them.
- It assumes reinvestment at the same rate — the classic academic critique. In practice, treat IRR as a comparison tool rather than a literal promise.
- Irregular cash flows can be messy — unusual patterns of money in and out can, in rare cases, produce more than one mathematically valid IRR.
See the return on a property over time
Our equity forecast calculator projects how value and equity build over a holding period — the raw material an IRR is built from.
Open the equity forecast calculator