What Is 30 day sec yield

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Last updated: April 15, 2026

Quick Answer: The 30-day SEC yield is a standardized measure of a fund's income return over the past 30 days, annualized and adjusted for fees, required by the U.S. Securities and Exchange Commission (SEC) to allow investors to compare bond and money market funds. It reflects net investment income after deducting expenses and is updated monthly.

Key Facts

30-day SEC yield is calculated using a formula mandated by the U.S. Securities and Exchange Commission since 1985
The yield is based on dividends and interest earned in the past 30 days, annualized and adjusted for fund expenses
It provides a standardized metric for comparing income returns across bond and money market funds
Unlike distribution yield, 30-day SEC yield accounts for changes in interest rates and fund expenses
The figure is updated monthly and reported by most mutual funds and ETFs

Overview

The 30-day SEC yield is a standardized performance metric used by mutual funds and exchange-traded funds (ETFs), particularly in the bond and money market sectors, to report income returns. It was established by the U.S. Securities and Exchange Commission (SEC) to ensure consistency and transparency in how funds advertise their yields to investors.

This metric helps investors compare income-generating funds on an equal footing by removing inconsistencies caused by varying payout schedules and expense structures. It reflects the net income earned over the past 30 days, annualized, and adjusted for fund fees and expenses.

Standardized calculation: The 30-day SEC yield follows a uniform formula set by the SEC, ensuring comparability across different funds and issuers.
Monthly updates: Funds typically update and report this yield once per month, reflecting the most recent 30-day income period.
Expense adjustments: The yield subtracts the fund’s 12b-1 fees, management fees, and other ongoing expenses from gross income.
Interest rate sensitivity: Because it uses recent income data, the 30-day SEC yield responds quickly to changes in prevailing interest rates.
Applicable to fixed-income funds: It is most commonly used for bond funds, municipal bond funds, and money market funds, where income is a primary return component.

How It Works

The 30-day SEC yield uses a specific formula that captures a fund’s net investment income over a recent 30-day period and annualizes it to project a full-year return. This allows investors to estimate potential income without being misled by short-term fluctuations or outdated yield figures.

Term: The 30-day period refers to the most recent calendar month for which data is available. This yield is recalculated monthly to reflect current market conditions and fund performance.
Income sources: It includes interest payments from bonds and dividends from securities held in the fund, providing a comprehensive view of earnings.
Annualization: The 30-day income is multiplied by 12 to estimate a full-year return, assuming income remains consistent throughout the year.
Fee deductions: All applicable fund expenses, including management fees and 12b-1 fees, are subtracted before calculating the final yield percentage.
SEC formula: The calculation follows Rule 2a-5 under the Investment Company Act of 1940, ensuring regulatory compliance and uniformity across fund disclosures.
Public disclosure: The yield must be disclosed in fund prospectuses, fact sheets, and regulatory filings, making it accessible to all investors.

Comparison at a Glance

Below is a comparison of the 30-day SEC yield versus other common yield metrics used in fund reporting:

Metric	Time Period	Expense Adjusted?	Standardized by SEC?	Use Case
30-day SEC yield	30 days (annualized)	Yes	Yes	Comparing bond and money market funds
Distribution yield	Past 12 months	No	No	Historical income performance
Trailing 12-month yield	12 months	No	No	Long-term income trends
1-day yield	1 day (annualized)	Yes	Yes	Money market fund daily performance
Effective yield	Varies	Yes	No	Accurate reinvestment assumptions

This table highlights how the 30-day SEC yield stands out due to its regulatory standardization and expense adjustments. While other yields may reflect longer historical periods or different assumptions, the 30-day SEC yield offers a current, apples-to-apples comparison that is especially useful for conservative investors focused on income stability.

Why It Matters

Understanding the 30-day SEC yield is essential for investors evaluating fixed-income funds, as it provides a transparent, consistent benchmark for expected returns. Unlike older or non-standardized yield measures, it reflects real-time income generation and fund costs.

Investor protection: The SEC-mandated formula prevents misleading yield claims and promotes fair disclosure across fund providers.
Performance benchmarking: It allows side-by-side comparison of funds with different payout schedules or fee structures.
Interest rate environment: Rising or falling rates are quickly reflected in the 30-day figure, helping investors adjust expectations.
Fee transparency: By including expenses, it reveals how much of a fund’s gross return actually goes to investors.
Regulatory compliance: Funds must report this yield in official documents, ensuring accountability and consistency.
Decision-making tool: Conservative investors use it to prioritize funds with stable, predictable income streams.

For anyone investing in bond or money market funds, the 30-day SEC yield is a critical metric that balances accuracy, timeliness, and regulatory oversight—making it a cornerstone of informed investing.