Definition
The 30-day SEC yield is a standardized yield figure that the U.S. Securities and Exchange Commission requires funds to calculate the same way, so investors can compare one fund against another on a level field. It is sometimes called the "standardized yield" for exactly that reason.
The calculation takes the interest and dividend income the fund actually earned over the most recent 30 days, subtracts the fund's expenses over that period, and then annualizes the result relative to the fund's price. In simplified form:
SEC Yield = ((Income earned − Expenses) / Shares) / NAV per share, annualized
Three features make it distinctive:
- It is net of expenses. The fund's management fee is already subtracted, so a
cheaper fund shows a higher SEC yield than an otherwise-identical expensive one.
- It is based on a fixed 30-day window. It reflects the income the portfolio is
currently generating, not what it paid out over the past year.
- It is calculated on net asset value (NAV). The yield is measured against the
fund's per-share NAV, which keeps the figure comparable across funds regardless of share price.
Because every fund must run the same formula, the SEC yield is meant to be the one income number you can trust when lining up two funds side by side.
Why It Matters
The SEC yield exists to solve a real problem: the other yield numbers are easy to game. A fund company can advertise a "trailing 12-month yield" that reflects a big one-time payout, or a "distribution rate" that annualizes the most recent — possibly inflated — distribution. Neither has to reflect what the portfolio is truly earning right now. The SEC yield is harder to dress up because the SEC dictates the inputs and the math.
It is worth understanding how it differs from the two numbers investors see most:
- Distribution rate takes the most recent distribution, annualizes it, and
divides by price. It reflects what the fund *pays out*, which can include return of capital and realized gains, not just earned income. See distribution rate for the full picture.
- Trailing 12-month (TTM) yield sums the actual distributions over the past year
and divides by current price. It is backward-looking and can be skewed by special distributions.
- SEC yield looks only at income earned in the last 30 days, net of fees. It is
the most forward-looking and the most conservative of the three.
The gap between these numbers is where the real information lives. When a fund's distribution rate is much higher than its SEC yield, the fund is paying out more than it is earning as income — often by returning capital or distributing option premium. That is not automatically bad, but it is something the SEC yield forces into the open.
The number does have limits. For covered-call and option-income funds, the SEC yield is famously misleading — but low, not high. The premium those funds collect by selling options is treated as a capital transaction, not as interest or dividend income, so it does not count in the SEC yield formula. A fund advertising a 12% distribution rate can therefore post an SEC yield near 1% or even lower. The tiny SEC yield is not a red flag by itself; it simply means the SEC formula was never designed to capture how those funds generate cash.
Example
Compare three well-known dividend ETFs. The exact figures move over time, but the *relationship* between their two yield numbers is instructive:
- SCHD — a dividend-growth ETF holding quality
dividend payers. Its SEC yield and distribution rate sit close together, often within a few tenths of a percent, because nearly all of what it pays out is genuine dividend income.
- VYM — a broad high-dividend-yield ETF. Like SCHD, its
SEC yield and distribution rate track closely, since the payout is almost entirely ordinary dividend income from the underlying stocks.
- SPHD — a high-dividend, low-volatility ETF that pays
monthly. Its distribution rate can run a bit above its SEC yield in periods when distributions include realized gains, so the two numbers separate more than they do for a pure dividend-growth fund.
For all three of these traditional dividend ETFs, the SEC yield and distribution rate stay in the same neighborhood — a sign the payout is being funded by real income. Now contrast that with a covered-call income fund: it might show a distribution rate near 10-12% alongside an SEC yield around 1%. That enormous gap is the tell that the payout is coming from option premium and, at times, return of capital rather than from interest and dividends. The SEC yield quietly reveals what the marketing number hides.
Common Mistakes
- Comparing an SEC yield to a covered-call fund's distribution rate. These
measure different things. Judging an income fund's SEC yield against a dividend fund's distribution rate — or vice versa — is comparing apples to oranges and will make one fund look far worse than it is.
- Assuming the SEC yield is what you'll actually receive. It is not a promise of
future payments. It estimates the income the current portfolio generates; your actual distributions can be higher or lower and may include return of capital or capital gains.
- Ignoring the SEC yield because it looks "too low." A conservative-looking SEC
yield is often the honest number. If a fund's distribution rate towers over its SEC yield, that gap is telling you something, not hiding something.
- Comparing SEC yields from different dates. Because it is a 30-day snapshot, the
figure moves with interest rates and portfolio changes. Only compare funds' SEC yields measured as of roughly the same date.
- Forgetting it is net of fees. Two funds with identical holdings but different
expense ratios will show different SEC yields. That is a feature — the cheaper fund genuinely leaves more income in your pocket.
FAQ
What is a good SEC yield?
There is no universal threshold, because a "good" SEC yield depends entirely on the fund's asset class and the current interest-rate environment. A broad dividend ETF might show an SEC yield of 1.5-4%, a high-yield bond fund could be 6-8%, and a money market fund tracks short-term rates. The more useful test is comparing a fund's SEC yield against its own peers over the same date, and checking how far it sits below the fund's distribution rate. A number that is close to the distribution rate signals the payout is funded by real income.
Why is a fund's SEC yield lower than its distribution rate?
Because they measure different things. The SEC yield counts only interest and dividend income earned over the last 30 days, net of expenses. The distribution rate annualizes whatever the fund most recently paid out — which can also include realized capital gains, option premium, and return of capital. When the distribution rate is much higher, the fund is paying out more than it earns as income, and the difference is coming from those other sources rather than from dividends and interest.
Why do covered-call ETFs have such a low SEC yield?
Covered-call and option-income ETFs earn most of their cash by selling options and collecting premium. Under the SEC's formula, that premium is treated as a capital transaction, not as interest or dividend income, so it is excluded from the SEC yield. The result is that a fund advertising a double-digit distribution rate can show an SEC yield near 1%. It reflects a limitation of the formula for these strategies, not necessarily a problem with the fund.
Is the SEC yield the same as the trailing 12-month yield?
No. The trailing 12-month yield sums the fund's actual distributions over the past year and divides by the current price, so it is backward-looking. The SEC yield looks only at income earned in the most recent 30 days, net of fees, making it more current and more conservative. The two can differ substantially, especially after a change in interest rates or a large one-time distribution.