Expensive Money: Why "0% Interest" Rarely Is

Walk into any furniture store or appliance showroom and you'll see the same sign: "0% interest if paid in full within 18 months."

It sounds free. Millions of people sign up for it every year.

Here's what actually happens with a lot of these deals. The interest isn't waived — it's deferred. If you pay off the balance one day late, or miss a single payment, the store charges you interest retroactively, back to day one, on the whole original amount. Not just on the remaining balance. On everything.

Consumer groups have flagged this for years. It's legal. It's disclosed, technically, in paragraph nine of a document nobody reads. And it works because "0%" is such a clean, appealing number that people stop doing math the moment they hear it.

Founders do the same thing with SAFE notes.

A SAFE — Simple Agreement for Future Equity — feels like free money too. No interest rate. No monthly payments. No debt sitting on the balance sheet making your accountant nervous. You take the check, you build the thing, everybody's happy.

Until the conversion event.

That's when the SAFE turns into equity, usually at your next priced round, and the math you didn't do at the time shows up all at once. A $50,000 SAFE that converts into 10% of the company doesn't cost you $50,000. If you sell for $1M, it costs you $100,000. If you sell for $10M, it costs you a million. There was never an interest rate to warn you, so there was never a moment that felt like a cost.

Compare that to a straight loan. Borrow $50,000 at 7%, pay it back over five years, you're out roughly $10,000 total. Annoying, but bounded. You know the number on day one.

Equity doesn't work that way. The price is set by how well you do, which means the better your company performs, the more expensive that "free" money turns out to be.

None of this means don't raise. It means run the number before you sign, not after you sell.

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More on this in The Pitch Deck Book: https://www.amazon.com/Pitch-Deck-Book-Business-Investors/dp/B098PKPL73

Composite characters, invented companies. The mistakes are real; the people aren't.