DailyDime

Two angel investments. Same multiple. Completely different IRR. Here’s why the math that accounts for time is the only math that matters.

Imagine two deals. In Deal A, you write a $50,000 check and get $150,000 back three years later, a 3x return. In Deal B, you write the same check and get $150,000 back six years later. Also a 3× return.

Same multiple. Same outcome on paper. But Deal A is a dramatically better investment.

The metric that explains why is called internal rate of return (IRR). It’s the tool serious angel investors use to compare deals on an apples-to-apples basis. The multiple tells you how much you made. IRR tells you how fast you made it, and that distinction is everything.

What IRR Actually Measures

IRR is the annualized rate of return. It ensures the net present value of all your cash flows equals zero. That sounds like a mouthful. Here’s the plain-English version: IRR is the compound annual growth rate your investment would need. It needs to achieve this rate to produce exactly the returns you received.

Think of it as the investment’s internal speedometer. A 3× return in three years represents a very different speed than a 3× return in six years. Even though the destination looks identical.

Going back to those two deals: Deal A, $50,000 in, $150,000 back in year three. This deal produces an IRR of roughly 44%. Deal B, with the same entry and exit but six years instead of three, produces an IRR of about 20%. Both are solid outcomes. But if your hurdle rate as an angel investor is 25%, Deal A clears it comfortably. Deal B barely makes the cut.

That’s the power of the metric. It collapses time, capital, and return into a single comparable number.

Why Angels Live and Die by IRR

Most experienced angel investors don’t celebrate a multiple in isolation. They ask: what was the IRR? A 5× return sounds spectacular, and it is, if it came back in four years (roughly 50% IRR). If it took ten years, you’re looking at an IRR of about 17%. This is decent. However, you probably could have achieved better results in a diversified index fund. It offers much less risk and zero board meetings.

The benchmark most angels use as a minimum hurdle rate is somewhere between 20% and 25% annualized. Anything below that, and you’re not being compensated enough for the illiquidity and binary risk of early-stage investing. IRR gives you a way to hold every deal, regardless of structure, hold period, or payout timing, against that standard.

It also helps you think clearly about follow-on investments. If a company is doing well, but an exit looks several years out, the IRR profile changes significantly. A follow-on check at the same valuation differs from the original investment made at a lower price and earlier date. Running the numbers keeps you honest.

How to Calculate It

The formula behind IRR requires solving for the discount rate. This rate sets a sum of discounted cash flows to zero. No one calculates it by hand. Every spreadsheet has an IRR() function. The calculator above lets you enter your investment and yearly cash flows. You can see the result instantly.

The inputs are simple. They include your initial check size and whatever cash comes back to you in each subsequent year. This could be a distribution, a partial exit, or a full exit at the end. The calculator shows your MOIC (multiple on invested capital). It displays this alongside the IRR. You can see both dimensions of the return at once.

Note: investment amounts are negative (outflows) and returns are positive (inflows). Time is the great equalizer.

What IRR Doesn’t Tell You

IRR is a powerful tool, but it has blind spots worth knowing.

It assumes that any cash flows you receive along the way get reinvested at the same IRR. This is an assumption that often flatters the number in practice. It also doesn’t account for the absolute size of the return. A 60% IRR on a $10,000 check is a nice outcome. However, it won’t move the needle on a portfolio. That’s why sophisticated investors look at IRR alongside MOIC, not instead of it.

IRR does not indicate the quality of the business. It does not reflect the terms of the deal. It does not show the likelihood of actually reaching the exit. It’s a return metric, not a diligence metric. Use it to compare and rank; use everything else to decide.

The Bottom Line

Most people who throw IRR around in pitch meetings couldn’t define it if pressed. Now you can, and more importantly, you can use it. Before you evaluate your next deal on the multiple alone, run the IRR. You might find that the flashy 4x exit your friend is bragging about shows only 1% annual growth. It would have been better off sitting in a Treasury bond.

Time is the variable most investors forget to price. IRR is how you remember it.

Related Posts: What is QSBS? A Guide for Small Business Owners, Founders and Investors | Starting a Business: Tips for Success | Warren Buffett’s Famous Hedge Fund Bet