A stock can fall twenty percent while the company itself does nothing wrong. No earnings miss, no scandal. Just a jobs report that nudged bond yields up.
That’s the part of stock analysis people tend to skip, and I understand why. Rates feel like macro stuff, somebody else’s department. But every valuation you’ll ever build has an interest rate buried in it somewhere, whether you typed it in or not. The year 2022 drove that home pretty hard. The Fed went from basically zero to over four percent in under a year, and the Nasdaq Composite finished down roughly a third. Lots of those companies were still growing.
The Discount Rate Does the Dirty Work
Strip a stock down and it’s a claim on cash that hasn’t shown up yet. To figure out what that cash is worth today you shrink it by a discount rate, and the floor under that rate is whatever Treasuries pay. Push the floor up and the whole stack of future cash gets lighter.
A toy example helps more than the theory. Say a company pays five dollars a share in dividends and grows that four percent a year. If you want eight percent back, the textbook growth model values it at $125. Want nine instead? Now it’s worth $100. One percentage point, a fifth of the value gone, and it’s exactly the same business it was yesterday.
Before I touch a spreadsheet I usually pull up a long chart of price against earnings. Decent stock analysis charts going back twenty years make the pattern almost embarrassing to look at: multiples puff up when money’s cheap and deflate when it isn’t, more or less on schedule.
Why the Exciting Stocks Get Hurt Worst
Growth companies are where rates really bite. If most of a firm’s profits are expected a decade out rather than next year (think young software outfits, or a biotech waiting on trial results), then most of its value sits in exactly the part a higher discount rate crushes. A thirty-year bond swings harder than a two-year note for the same reason. Bond traders call it duration, and yes, it applies to stocks.
A boring company paying out cash today? It gets bruised. That’s about it.
My honest take is that the near-zero years spoiled a lot of stock analysis. People congratulated management for valuations that were, to a large extent, a side effect of free money.
Rates Show Up on the Income Statement Too
It isn’t only a math problem, though.
Companies that borrowed heavily have to refinance eventually, and new debt costs more, so profits can shrink while revenue holds perfectly steady. I always check when the big maturities land (it’s in the 10-K notes, usually a small table). Then there’s the customer side. Mortgages, car loans, a sofa on a payment plan, all of it gets pricier and demand cools off.
Banks are the odd ones out. Their lending margins can widen for a while, at least until savers start demanding more on deposits. Utilities and REITs get treated like bond stand-ins, on the other hand, and a four percent dividend loses a lot of its charm once a Treasury pays about the same with zero risk. So one Fed meeting can help a stock in your portfolio and hurt the one sitting right next to it, which is why sector matters so much in any rate-aware stock analysis.
What I’d Change in Your Own Process
Don’t let your discount rate go stale. If the ten-year yield has moved a full point since you last ran your numbers, those numbers are wrong now. Plenty of investors still use the same rate for years anyway.
A quick sanity check I like: flip the P/E upside down to get the earnings yield, then set it next to the Treasury yield. A P/E of twenty-five works out to four percent. If a government bond pays roughly four too, you’re betting almost everything on growth. (Some folks call this the Fed model. It’s crude and it ignores inflation, but it’s caught me more than once.)
And stress test. Run your stock analysis at today’s rate and again at a point higher. If the idea only survives at the lower one, that tells you more than any price target will.
Conclusion
I can’t predict where rates go next. I don’t trust people who say they can, either.
Good stock analysis doesn’t need that prediction anyway. It needs you to admit how much of a stock’s price leans on cheap money, and to redo the math when cheap money goes away, which, if 2022 taught anybody anything, it eventually does.