What Is Effective Yield and Why It Matters for Income Investors

Two people buy the same preferred stock. One pays $100 a share; the other waits and pays $95. They collect the identical dividend every month — and yet they are not earning the same return. The one who paid less earns more, on every single dollar, for as long as they both hold. That gap is the most useful idea I know for buying income, and it has a name: effective yield. It is the first number I work out before I take any income instrument seriously, and it is almost never the number in the headline.

Stated yield versus effective yield

The stated yield — the coupon, the rate everyone quotes — is the annual dividend measured against the par value the instrument was issued at. A preferred with a $100 par paying $13 a year has a stated yield of 13%, and that number is fixed for good the day it is issued.

The effective yield is the same dividend measured against the price you can actually buy it at today. If that $13 stock is trading at $95, the effective yield is 13 ÷ 95 = 13.68%. At $106 it is 13 ÷ 106 = 12.26%. The dividend has not budged — only the price has, and that alone moves what a new buyer earns. Stated yield is the sticker on the box; effective yield is what you pay at the till.

Why the price wanders off par

A preferred trades on the open market like anything else, so its price drifts with supply and demand, interest-rate expectations, news about the issuer, and plain market mood. Even STRC, whose rate is reset to pull it back towards $100, still moves around in the meantime — and a conventional fixed-rate preferred can swing a long way when rates shift, because its dividend can't. The upshot is that effective yield almost never sits exactly on the stated rate, which is precisely why it is the one worth watching.

Effective yield is what you actually earn

When you buy STRC or SATA you buy at the market price, not at par, so your return is the effective yield at your entry — not the advertised rate. Pay $103 for a share that pays $11.50 a year and you are earning 11.17%, not 11.50%. It sounds trivial; on a large position it isn't. Flip it around and the point gets more interesting: if a wobble drops STRC to $97, a buyer there locks in about 11.86%, comfortably above the stated 11.50%. This is why I don't read a price dip below par as bad news — for a patient income buyer it is a higher yield on sale, as long as you understand that is what you are measuring. The mechanics of how STRC's rate chases par are in how STRC works.

Yield on cost: your number, and it is locked in

Here is the part people muddle. Once you have bought, your cost basis is fixed, and so is your yield on cost — the dividend as a percentage of what you paid. It does not move when the market price moves. Buy at $97 and watch the price climb to $104 later: you are still collecting the same cash per share, so your personal yield on cost is still about 11.86%. The live effective yield quoted on the site is aimed at someone buying today — it says nothing about what your existing position is earning. Your number was set the moment you bought.

Where I watch it

Two tools on the site lean on this directly. The effective-yield charts for STRC and SATA plot the figure over time: a rising line means the price has fallen against the dividend — better value for new money — while a falling line means it has gotten more expensive. A few months of that line tells you far more about whether today is a good entry than any single snapshot. And the Growth Projector builds its compounding on effective yield rather than the par-based rate, so reinvested dividends are assumed to buy in at today's real yield. Over a ten- or twenty-year horizon even a small difference in that starting yield fans out into a very different end number — which is the whole reason I bother tracking it to the decimal.

I track STRC and SATA daily and hold positions in their parent issuers (MSTR and ASST). Effective yield is the first number I check on either one — but this is how I think about it, not financial advice.

This article is for educational purposes only and does not constitute financial advice. Always consult a qualified financial adviser before making investment decisions.