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TTM yield looks back at distributions paid over the previous 12 months; 30-day SEC yield estimates recent portfolio income using a standardized, annualized calculation. They can differ because they cover different periods and may count different components. Neither tells you exactly what a fund will pay next or, on its own, how well the fund performed.
What is the difference between TTM yield and 30-day SEC yield?
| Measure | What it represents | How to interpret it |
|---|---|---|
| 30-day SEC yield | Net investment income earned over a recent 30-day period, after fund expenses, annualized under a standardized formula and related to the fund’s end-period offering price or share price. | A standardized estimate of recent portfolio income, not a forecast or promised distribution. It can change with income, expenses, market prices, and calculation inputs. SEC guidance; Fidelity glossary |
| TTM distribution yield | Distributions over the trailing 12 months divided by a recent NAV or share-price measure, according to the provider’s stated method. | A historical distribution measure. Check the provider’s formula and whether it includes capital gains or return of capital. Schwab Asset Management; New York Life Investment Management |
The SEC describes SEC yield as an approximation of current income generated by portfolio securities over a historical 30-day period, after fund expenses, expressed as an annualized percentage of the fund’s offering price. Its standardized method is intended to help investors compare comparable funds. SEC staff guidance
“TTM yield” is less uniform. For example, New York Life Investment Management describes its 12-month rate as trailing distributions divided by the last month’s ending share price and includes capital gains distributed during the period. It cautions that this rate may include return of capital and should not be confused with yield or income. Other providers may use different methods, so check the fund or data provider’s definition. New York Life Investment Management; Schwab Asset Management
Why is the SEC yield different from the distribution yield?
- The lookback periods differ. SEC yield annualizes income from a recent 30-day period; TTM distribution yield aggregates payments over 12 months. A recent change in portfolio income or market rates can show up in SEC yield before it is reflected in a full year of distributions. SEC staff guidance
- The amounts included may differ. TTM distributions can include realized capital gains and, depending on the fund’s payments, return of capital. Those payments are not necessarily recurring income earned by the portfolio. Investor.gov
- The formulas and denominators may differ. Providers do not calculate TTM yield identically. SEC yield uses a standardized formula, although specific fund disclosures and special cases can affect its application. Schwab Asset Management; SEC staff guidance
- Expenses and waivers matter. SEC yield reflects fund expenses and may reflect fee waivers or reimbursements. Check whether a displayed yield is subsidized and when any waiver expires. Fidelity glossary; New York Life Investment Management
Which yield should I use to compare mutual funds?
For a standardized comparison of recent portfolio income among comparable funds, start with the 30-day SEC yield and its as-of date. Treat it as an estimate based on a recent period, not as a distribution forecast. To see what a fund distributed over the preceding year, use its TTM distribution history—but first check how the figure was calculated and what the payments contained.
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Neither yield alone measures investment performance. The SEC warns that a fund can perform poorly while still making distributions and advises investors not to rely solely on distributions to understand performance. Compare total return as well. Investor.gov, “Fund Distributions – Investor Bulletin” (August 19, 2026)
A practical comparison checklist
- Confirm the as-of date for each yield.
- Make sure you are comparing the same share class.
- Read the provider’s TTM formula, including its treatment of capital gains.
- Check whether distributions included return of capital.
- See whether expenses or temporary fee waivers affect SEC yield.
- Review total return, investment risks, and the fund’s distribution policy.
Fund prospectuses explain distribution policies, and fund websites commonly provide distribution information. Investor.gov
Does a fund’s distribution yield include return of capital?
It can. A distribution may come from dividends, interest, realized capital gains, return of capital, or a combination. Return of capital is a payment from shareholder principal; it reduces the fund’s asset base and can reduce an investor’s cost basis. A large distribution rate therefore does not prove that the fund earned that amount as income or that the payment is sustainable.
When relevant, review the fund’s Section 19(a) notices for estimates of distribution character and the final tax reporting for the tax treatment. The final tax information, rather than an estimate in a notice, determines how distributions are reported. Investor.gov
Is 30-day SEC yield what I will receive each month?
No. It is an annualized estimate based on recent net investment income, not a monthly payment amount or a promise about future distributions. J.P. Morgan Asset Management likewise notes that SEC yield may not match a fund’s actual distribution rate. J.P. Morgan Asset Management glossary
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why TIPS fund yields may need extra care
For funds investing significantly in Treasury Inflation-Protected Securities (TIPS), differing approaches to inflation adjustments can produce significant yield differences between similar funds. Including a recent 30-day inflation adjustment as income may make SEC yield unusually high and volatile when inflation is changing rapidly.
SEC staff guidance encourages tailored explanations and says staff will not object if a TIPS fund instead uses an inflation adjustment looking back over 12 months, provided the fund discloses that method. This is staff guidance, not a Commission rule; the SEC page states that it has no legal force or effect. Read a TIPS fund’s own explanation before comparing its yield with another fund’s. SEC staff guidance
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