# EDGAR Filing Document

**Accession Number:** 0000895574
**File Stem:** 0001104659-26-052706
**Filing Date:** 2026-4
**Character Count:** 6954
**Document Hash:** f166fa166b61684f188c1b1c328b3500
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-26-052706.hdr.sgml**: 20260430

**ACCESSION NUMBER**: 0001104659-26-052706

**CONFORMED SUBMISSION TYPE**: 425

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20260430

**DATE AS OF CHANGE**: 20260430

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** abrdn National Municipal Income Fund
- **CENTRAL INDEX KEY:** 0000895574

**ORGANIZATION NAME:**
- **EIN:** 411737161
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 0330

**FILING VALUES:**
- **FORM TYPE:** 425
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 811-07410
- **FILM NUMBER:** 26923615

**BUSINESS ADDRESS:**
- **STREET 1:** C/O ABRDN
- **STREET 2:** 1900 MARKET STREET, SUITE 200
- **CITY:** PHILADELPHIA
- **STATE:** PA
- **ZIP:** 19103
- **BUSINESS PHONE:** 215-405-5700

**MAIL ADDRESS:**
- **STREET 1:** C/O ABRDN
- **STREET 2:** 1900 MARKET STREET, SUITE 200
- **CITY:** PHILADELPHIA
- **STATE:** PA
- **ZIP:** 19103

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Delaware Investments National Municipal Income Fund
- **DATE OF NAME CHANGE:** 20081209

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** DELAWARE INVESTMENTS FLORIDA INSURED MUNICIPAL INCOME FUND
- **DATE OF NAME CHANGE:** 20020327

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** VOYAGEUR FLORIDA INSURED MUNICIPAL INCOME FUND
- **DATE OF NAME CHANGE:** 19930519
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** abrdn National Municipal Income Fund
- **CENTRAL INDEX KEY:** 0000895574
- **STANDARD INDUSTRIAL CLASSIFICATION:** UNKNOWN SIC - 0000 [0000]

**ORGANIZATION NAME:**
- **EIN:** 411737161
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 0330

**FILING VALUES:**
- **FORM TYPE:** 425

**BUSINESS ADDRESS:**
- **STREET 1:** C/O ABRDN
- **STREET 2:** 1900 MARKET STREET, SUITE 200
- **CITY:** PHILADELPHIA
- **STATE:** PA
- **ZIP:** 19103
- **BUSINESS PHONE:** 215-405-5700

**MAIL ADDRESS:**
- **STREET 1:** C/O ABRDN
- **STREET 2:** 1900 MARKET STREET, SUITE 200
- **CITY:** PHILADELPHIA
- **STATE:** PA
- **ZIP:** 19103

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Delaware Investments National Municipal Income Fund
- **DATE OF NAME CHANGE:** 20081209

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** DELAWARE INVESTMENTS FLORIDA INSURED MUNICIPAL INCOME FUND
- **DATE OF NAME CHANGE:** 20020327

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** VOYAGEUR FLORIDA INSURED MUNICIPAL INCOME FUND
- **DATE OF NAME CHANGE:** 19930519

**Filed by abrdn National Municipal Income Fund<br> pursuant to Rule 425 under the Securities Act of 1933<br> and deemed filed pursuant to Rule 14a-6 <br> under the Securities Exchange Act of 1934**

**Subject Companies:**

**abrdn National Municipal Income Fund**

**File No.: 811-07410**

**Date: April 30, 2026**

---

| | |
|:---|:---|
| ![](tm2613080d1_pressreleasei1.jpg) | **abrdn Inc.**<br> 1900 Market Street, Suite 200,<br> Philadelphia, PA 19103 |

---

Dear Valued Shareholder,

**<u>YOUR VOTE MATTERS AND WILL IMPACT YOUR INVESTMENT</u>**

The **Special Meeting of Shareholders of abrdn National Municipal Income Fund ("VFL")**, scheduled for March 11, 2026, **was adjourned to May 6, 2026**, to allow more time to achieve the required vote.

**An overwhelming majority of shareholders that voted have voted FOR the proposal**. However, passage requires approval of more than 50% of outstanding shares, and additional shareholder responses are still needed.

**As one of the few shareholders who has yet to vote, your participation is especially important.** We respectfully ask you to consider the benefits of the proposed Agreement and Plan of Reorganization between VFL and MFS Municipal Income Trust detailed in the proxy, which include:

⮚ Increased fund size leading to

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o A broader investment mandate

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Improved portfolio diversification

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Investment flexibility to navigate changing marker environments

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Lower expense ratio

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Enhanced economies of scale

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Enhanced trading and investment efficiencies

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Enhanced operating and administrative efficiencies

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Great market visibility, analyst and media coverage

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Higher daily trading volume

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;o Enhanced income generation and increased distribution

**THE BOARD OF TRUSTEES OF THE FUND RECOMMENDS ALL SHAREHOLDERS TO VOTE "FOR" THE PROPOSAL.**

**<u>Please Cast Your Vote Today</u>**

Voting ensures your shares are represented and allows the fund to proceed with this important business. Details for **HOW TO VOTE** are provided below.

Thank you for your time, consideration, and continued investment. We sincerely appreciate your support.

Sincerely,

Megan Kennedy

Vice President and Secretary

abrdn National Municipal Income Fund

Page **2** of **2**

**How do I vote?** **There are four convenient methods for casting your important proxy vote:**

**1.** **Vote by Phone with a Representative** **:** You may cast your vote by telephone with a proxy representative by calling **toll-free 800-290-6427**. Representatives are available
Monday through Friday 9 a.m. to 11 p.m. Eastern Time. You may also contact your financial advisor for further information.

**2.** **Vote by touch-tone phone** **:** You may cast your vote by telephone using an automated system by calling the **toll-free** number found on the enclosed proxy card(s).

**3.** **Vote online:** You may cast your
vote by visiting the web address located on the enclosed proxy card(s) and following the instructions on the website.

**4.** **Vote by mail:** You may cast your
vote by signing, dating and mailing the enclosed proxy card(s) in the **postage-prepaid** return envelope provided.

**<u>We would be very grateful if you would use any one of the four voting methods listed above to ensure that your vote is recorded before the Special Meeting to be held on May 6, 2026.</u>**

**Shareholders are encouraged to read the proxy materials filed with the Securities and Exchange Commission ("SEC") because they contain important information. Copies of the proxy materials, including the notice of the Special Meeting and joint proxy statement/prospectus, can be obtained for free at the SEC's website** **<u>https://www.sec.gov/</u> and at: *<u>https://vote.proxyonline.com/aberdeen/docs/VFL.pdf</u>***