What is minimum acceptable rate of return?
- MARR is the minimum return you require before investing.
- Use it as a discount rate to calculate net present value.
- MARR rises with risk and opportunity cost.
- A 15% MARR doubles your capital every 4.8 years.
What is minimum acceptable rate of return?
Your minimum acceptable rate of return (MARR) is the lowest return you will accept before risking your money. It is your personal hurdle rate; if a deal cannot beat it, you walk away. Set it before you compare any opportunity.
You use MARR as the discount rate in a net present value calculation. Discount future cash flows back at your MARR; a positive result clears the hurdle. A negative one means reject. Some call it minimum attractive rate of return.
How MARR rises with risk
MARR climbs as risk climbs. A bond or a savings account is your low-risk baseline; any project must beat it by enough to cover the risk premium you take on. The riskier the venture, the higher the bar you demand.
MARR also carries opportunity cost. Backing one deal means forgoing every other use of the same capital. Your hurdle has to clear what you could have earned elsewhere, not just what the project promises.
The components behind a hurdle rate
MARR decomposes into known parts. Expected inflation, the risk of default, and the risk profile of the venture itself. Stack them honestly and you get a cutoff that reflects real conditions, not a guess.
Most companies anchor their hurdle to the long-run stock market return. Because the S&P 500 has historically returned roughly 8 to 11 percent, many set 12 percent as a floor. Individual investors often push higher.
Why 15 percent doubles your money
Many careful investors set their MARR at 15 percent. At that rate, the rule of 72 says capital doubles about every 4.8 years. The math holds as long as you reinvest at the same annual return.
A 15 percent bar is deliberately aggressive. It filters out low-yield bonds and idle cash. Only projects that can scale fast deserve your capital at that standard.
How does MARR relate to the cost of capital?
Your hurdle always sits above your cost of capital. Capital is not free; every dollar you put in has a price you must repay. A project must clear that cost first, then earn enough extra to make the risk worth taking.
That is why hurdle and cost of capital are not the same number. The cost of capital is the floor you pay to borrow or to use your own cash. Your MARR stacks the risk premium on top so you end with a real profit.
You can build the number from known parts. Start with a risk-free rate, add expected inflation, then the chance of default, then the risk of the venture itself. Stacked honestly, these parts give you a cutoff that reflects reality.
Companies operating in volatile markets set their hurdle higher to offset risk and keep investors. The more uncertain the industry, the steeper the bar. Your personal cutoff should climb the same way when the deal gets riskier.