The rate of return (RoR) is the net gain or loss on your investment calculated over a specific period of time, expressed as a percentage of the initial cost of investment. It’s straightforward enough as a formula. The hard part is working out what the initial cost of your investment was and the current value of the asset.
What is the difference between ROI, RoR, and IRR?
Return on investment (ROI), RoR, and Internal Rate of Return (IRR) are all very similar, but each is used for slightly different purposes when it comes to forecasting and evaluating capital investments.
ROI: Return on investment
This is the simplest of the three formulas and is usually used when an asset is liquidated or as a final figure when an investment project is completed.
ROI = net profitcost of investment 100
Easy. But what ROI doesn’t account for is the length of the investment period or inflation.
Consider the following:
You buy a warehouse for €500,000 and sell it for €750,000. Using the formula, the ROI is 50 percent. Not bad going. A friend does the same, only they buy a warehouse for €400,000 and sell it for €600,000. You have the better investment, right? Not quite. You sold your warehouse after 5 years, which means your annual rate of return was 10 percent. Your friend sold their warehouse after just 2 years, giving them an annual rate of return of 25 percent.
Inflation shouldn’t be much of a factor over a two-year investment, but if you’re looking at five years, ten years, or more, then ROI becomes less and less useful.
RoR: Rate of return
The rate of return calculation is used to determine the growth rate of an investment that is still in progress. Think of it like checking the health of your investment. Is everything working as your predictions suggested or is it time to make adjustments or even pull the plug?
The formula looks like this:
RoR = current value - original valueoriginal value 100
As an example, let’s say you bought a popular domain name for your ecommerce shop. It was expensive, but it should give your search engine optimisation (SEO) a huge boost and make it much easier for customers to find you. You paid €40,000 for the URL two years ago. Let’s say your sales before you bought the domain name was €250,000 per year. Now, your shop is pulling in around €300,000 per year.
Using the formula, the RoR for that investment is (€400,000 - €250,000)/€250,000 or 20 percent.
The ROI would yield a return of 37.5 percent.
IRR: Internal rate of return
The internal rate of return (IRR) is used to account for the effect of inflation on investment profits. It also takes into consideration the length of the investment period. If you know about business forecasting, you might be familiar with the Net Present Value (NPV) calculation.
IRR is NPV if we assume that the NPV equation is also equal to zero.
NPV = t=1T C1(1+r)t -C0 =0
where:
T = total number of time periods
t = time period
C1 =net cash flow in one time period t
C0 =baseline cash flow
r = discount rate
Usually, the higher the internal rate of return, the more desirable an investment is to undertake, and vice versa. As IRR is uniform for investments of varying types, it's useful for accurately ranking multiple prospective investments or projects. You can also use it to understand if establishing a new operation or expanding your existing one would be profitable in the long term.