13 Nov 2026
What Is the Difference Between a Distribution Rate and a 30-Day SEC Yield?
A distribution rate shows what a fund has recently paid out, annualized and divided by its price or net asset value. The 30-day SEC yield is a standardized measure of the net investment income a fund earned over the last 30 days, calculated under a formula set by the Securities and Exchange Commission. The two can differ widely, especially for option income funds, because the distribution rate can include payments the SEC yield excludes.
What is a distribution rate?
A distribution rate expresses a fund’s recent payments as a percentage of its share value. A common method takes the most recent distribution, annualizes it, and divides by the fund’s net asset value or market price on a given date. For a fund that pays monthly, that means multiplying the latest payment by 12.
Some funds also publish a trailing 12-month distribution yield, which adds up the distributions actually paid over the past year and divides by a current share value. Methods differ across fund sponsors, so it is important to read how a particular figure is calculated.
A distribution rate reflects whatever the fund paid out. That can include dividends, interest, option premium, capital gains and return of capital. It does not distinguish between these sources, and it is not a measure of what the fund earned or of its total return.
What is the 30-day SEC yield?
The 30-day SEC yield is a standardized figure defined in Form N-1A, the registration form for open-end funds, including most ETFs.1 It was designed so that investors can compare the income of different funds on a consistent basis.
The calculation uses four inputs for the most recent 30-day period: the dividends and interest the fund earned, the expenses it accrued, the average number of shares outstanding that were entitled to receive distributions, and the share price at the end of the period. The formula subtracts expenses from income, divides by shares and price, and annualizes the result using a six-month compounding convention.2 In notation, the yield equals two times the quantity of one plus net income per share divided by price, raised to the sixth power, minus one.
Three features of the SEC yield matter most:
It reflects only net investment income. Dividends and interest are counted. Option premium, realized capital gains and return of capital are not.
It is net of expenses. Fund expenses are subtracted, so the figure reflects income after costs. Funds with fee waivers may also report an unsubsidized yield that shows the result without the waiver.
It is backward-looking. The figure describes the past 30 days. It is not a forecast of future income.
Why can the two numbers be so different?
The difference comes down to what each measure includes.
For a traditional bond fund, most of what the fund distributes is interest, so its distribution rate and SEC yield are often in the same general range. Differences arise from timing, from the use of price versus net asset value, and from how premiums and discounts on bonds are amortized under the SEC method.
For an option income fund, the gap can be large. These funds generate much of their cash flow by selling options, and the premium they collect is excluded from the SEC yield calculation. A fund holding stocks with modest dividends and selling options against them can report a low SEC yield alongside a much higher distribution rate. Neither figure is wrong. They answer different questions: the SEC yield measures net investment income, while the distribution rate measures what the fund has paid.
A high distribution rate does not, by itself, indicate that a fund earned that amount. Part of a distribution may be classified as return of capital for tax purposes, and a fund’s total return, which combines changes in net asset value with distributions, is the measure of how the investment performed. Our article on return of capital in ETF distributions covers how that classification works.
Which number should investors use?
Each measure is useful for a different purpose.
The SEC yield is the better tool for comparing the income-generating ability of funds that earn mainly dividends and interest, such as bond funds and many equity income funds. Because every fund uses the same formula, it allows a like-for-like comparison. Under SEC Rule 482, any yield quoted in a fund advertisement must be calculated using the standardized method.3
The distribution rate shows the cash a fund has recently paid relative to its share value. It is relevant for investors planning around cash flow, but it should be read alongside the sources of those payments, as reported in the fund’s Section 19(a) notices and year-end tax reporting.4
Total return is the measure of results. It combines distributions with the change in net asset value over a stated period. Comparing a fund’s distribution rate to its total return over time helps show whether payments have been supported by the fund’s overall results.
Using these measures together gives a more complete picture than relying on any one of them.
How should investors read these figures for option income ETFs?
For funds that sell options, a few steps help put the published numbers in context.
Expect a gap. Because option premium is excluded from the SEC yield, a large difference between the SEC yield and the distribution rate is a structural feature of these funds, not an error.
Check the sources. Section 19(a) notices estimate how much of each distribution came from net investment income, capital gains and return of capital. Form 1099-DIV reports the final classification after year-end.
Look at total return. Total return over several periods shows how the strategy has performed after distributions. Our article on how covered call ETFs work explains the trade-offs behind those results.
Note the date and method. Distribution rates change as payments and share prices change. Check the as-of date and whether the rate is based on price or net asset value.
Frequently asked questions
Why is my fund’s SEC yield so much lower than its distribution rate?
Most often, the fund distributes cash from sources the SEC yield excludes, such as option premium, realized capital gains or amounts classified as return of capital. The SEC yield counts only dividends and interest, net of expenses. A large gap is common for option income funds and reflects what each figure measures.
Is the 30-day SEC yield a forecast?
No. It measures the net investment income a fund earned during the most recent 30-day period and annualizes it. Income in future periods may be higher or lower as holdings, interest rates and dividends change. It is a standardized snapshot, not a projection.
What is an unsubsidized SEC yield?
When a fund’s adviser waives fees or reimburses expenses, the reported SEC yield reflects the lower net expenses. The unsubsidized yield shows what the yield would have been without the waiver. A difference between the two indicates how much the waiver is adding to the reported figure.
Does a distribution rate include return of capital?
It can. A distribution rate is based on the total amount paid, regardless of its tax character. If part of a distribution is later classified as return of capital, that portion is still included in the rate. The classification is shown in Section 19(a) notices and on Form 1099-DIV.
Is a trailing 12-month yield the same as a distribution rate?
Not exactly. A trailing 12-month figure adds up the distributions actually paid over the past year, while a distribution rate often annualizes only the most recent payment. When payments vary from month to month, the two figures can differ. Fund materials should state which method is used.
Which measure should I use to compare two bond funds?
The 30-day SEC yield is designed for that purpose, because it applies the same formula to every fund and reflects income net of expenses. Comparing distribution rates across bond funds can give an incomplete picture when the funds use different calculation methods or distribute gains along with income.
- U.S. Securities and Exchange Commission, Form N-1A, Item 26 (calculation of yield).
- Form N-1A, Item 26, yield formula: two times the quantity of one plus (a minus b) divided by (c times d), raised to the sixth power, minus one, where a is dividends and interest earned during the period, b is expenses accrued, c is average daily shares outstanding entitled to receive distributions, and d is the maximum offering price or net asset value per share on the last day of the period.
- Securities Act of 1933, Rule 482(d).
- Investment Company Act of 1940, Section 19(a), and Rule 19a-1; IRS Instructions for Form 1099-DIV.
Cite this page: Adam Patti, "What Is the Difference Between a Distribution Rate and a 30-Day SEC Yield?," VistaShares, updated November 13, 2026, https://www.vistashares.com/distribution-rate-vs-sec-yield/. Plain-text version.
This material is provided for educational purposes only. It is not investment, legal or tax advice, and it is not a recommendation or an offer to buy or sell any security. Information is drawn from sources believed to be reliable as of the date of publication, is not guaranteed as to accuracy or completeness, and may change without notice. Figures attributed to third parties are their estimates. Projections and forecasts are not guarantees of future results. Investors should consult their own financial, legal and tax professionals before making investment decisions. Investments involve risk, including possible loss of principal. Strategies that use options involve additional risks, including limited participation in market gains, the risk that options do not perform as intended, and changes in distributions. Tax treatment depends on individual circumstances and on current law, which may change.