John Hancock Income Securities Trust : Tax-Advantaged Dividend Income Fund Notice to Shareholders – Sources of Distribution Under Section 19(a)

John Hancock Investment Management LLC

200 Berkeley Street

Boston, Massachusetts 02116

Media Contact:

NEWS

Gordon Haight [phone]

Investor Contact: [phone]

FOR IMMEDIATE RELEASE

JOHN HANCOCK TAX-ADVANTAGED DIVIDEND INCOME FUND NOTICE TO SHAREHOLDERS - SOURCES OF DISTRIBUTION UNDER SECTION 19(a)

BOSTON, MA (March 28, 2024) - John Hancock Tax-Advantaged Dividend Income Fund (NYSE: HTD)

(the "Fund"), a closed-end fund managed by John Hancock Investment Management LLC and subadvised by Manulife Investment Management (US) LLC, announced today sources of its monthly distribution of $0.1380 per share paid to all shareholders of record as of March 11, 2024, pursuant to the Fund's managed distribution plan. This press release is issued as required by an exemptive order granted to the Fund by the U.S. Securities and Exchange Commission.

Notification of Sources of Distribution

This notice provides shareholders of the John Hancock Tax-Advantaged Dividend Income Fund (NYSE: HTD) with important information concerning the distribution declared on March 1, 2024, and payable on March 28, 2024. No action is required on your part.

Distribution Period:

Distribution Amount Per Common Share:March 2024 $0.1380

The following table sets forth the estimated sources of the current distribution, payable March 28, 2024, and the cumulative distributions paid this fiscal year to date from the following sources: net investment income; net realized short term capital gains; net realized long term capital gains; and return of capital or other capital source. All amounts are expressed on a per common share basis and as a percentage of the distribution amount.

For the fiscal year-to-date period

For the period 03/1/2024-03/31/2024

11/1/2023-03/31/2024 1

Source

Current Distribution ($)

% Breakdown of the Current Distribution

% Breakdown of the Total

Total Cumulative Distributions ($)

Cumulative Distributions

Net Investment Income Net Realized Short-0.0922 67%

0.4457 65%

Term Capital Gains Net Realized Long-

0.0191 14%

0.0892 13%

Term Capital Gains Return of Capital or

0.0267 19%

Other Capital

Source

0.0000 0%Total per common share

0.1380

100%

0.0000 0%

0.1551 22%

0.6900

1 The Fund's current fiscal year began on November 1, 2023 and will end on October 31, 2024.

Average annual total return (in relation to NAV) for the 5 years ended on February 29, 2024	3.76%
Annualized current distribution rate expressed as a percentage of NAV as of February 29,
2024	7.92%
Cumulative total return (in relation to NAV) for the fiscal year through February 29, 2024
13.15%
Cumulative fiscal year-to-date distribution rate expressed as a percentage of NAV as of
February 29, 2024	3.30%

You should not draw any conclusions about the Fund's investment performance from the amount of this distribution or from the terms of the Fund's managed distribution plan.

The amounts and sources of distributions reported in this Notice are only estimates and are not being provided for tax reporting purposes. The actual amounts and sources of the amounts for tax reporting purposes will depend upon the Fund's investment experience during the remainder of its fiscal year and may be subject to changes based on tax regulations. The Fund will send you a Form 1099-DIV for the calendar year that will tell you how to report these distributions for federal income tax purposes.

The Fund has declared the March 2024 distribution pursuant to the Fund's managed distribution plan (the "Plan"). Under the Plan, the Fund makes fixed monthly distributions in the amount of $0.1380 per share, which will continue to be paid monthly until further notice.

If you have questions or need additional information, please contact your financial professional or call the John Hancock Investment Management Closed-End Fund Information Line at 1-800-843-0090, Monday through Friday between 8:00 a.m. and 7:00 p.m., Eastern Time.

Statements in this press release that are not historical facts are forward-looking statements as defined by the United States securities laws. You should exercise caution in interpreting and relying on forward-looking statements because they are subject to uncertainties and other factors which are, in some cases, beyond the Fund's control and could cause actual results to differ materially from those set forth in the forward-looking statements.

An investor should consider a Fund's investment objectives, risks, charges and expenses carefully before investing.

About John Hancock Investment Management

A company of Manulife Investment Management, we serve investors through a unique multimanager approach, complementing our extensive in-house capabilities with an unrivaled network of specialized asset managers, backed by some of the most rigorous investment oversight in the industry. The result is a diverse lineup of time-tested investments from a premier asset manager with a heritage of financial stewardship.

About Manulife Investment Management

Manulife Investment Management is the global brand for the global wealth and asset management segment of Manulife Financial Corporation. We draw on more than a century of financial stewardship and the full resources of our parent company to serve individuals, institutions, and retirement plan members worldwide. Headquartered in Toronto, our leading capabilities in public and private markets are strengthened by an investment footprint that spans 18 geographies. We complement these capabilities by providing access to a network of unaffiliated asset managers from around the world. We're committed to investing responsibly across our businesses. We develop innovative global frameworks for sustainable investing, collaboratively engage with companies in our securities portfolios, and maintain a high standard of stewardship where we own and operate assets, and we believe in supporting financial well-being through our workplace retirement plans. Today, plan sponsors around the world rely on our retirement plan administration and investment expertise to help their employees plan for, save for, andlive a better retirement. Not all offerings are available in all jurisdictions. For additional information, please visit manulife.com.