Number of tax returns with more than just salary information

Summary

The requester asked for statistics on Isle of Man tax returns for the 2023/2024 year to assess administrative burdens and potential savings from a UK-style self-assessment system. The Treasury disclosed that 61,225 returns were submitted, with 86.3% containing income sources or deductions beyond simple employment income.

Key Facts

• A total of 61,225 tax returns were submitted for the 2023/24 tax year.
• Approximately two-thirds of the tax returns were submitted online.
• 13.7% of returns recorded employment income as the only source of income.
• 86.3% of returns contained more than one income source and/or tax deductions.
• The request was formally closed by the Treasury on 12 February 2026.

Data Disclosed

• 61,225
• 13.7%
• 86.3%
• 2023/24
• 2026-01-22
• 2026-01-29
• 2026-02-12
• 5247929

Original Request

I would like to know how many tax returns are submitted annually on the IOM, and out of those returns, how many (or what percentage) just contain information submitted by an employer with regards to income, and how many continue additional income. What I am trying to understand is the administrative burden placed on the individual tax returns department to assess if significant savings of personnel could be made, if a system similar to the UK was implemented where only people with additional income on top of their salary have to submit a self assessment tax return. Can this please cover the previous tax year, 2023/2024.

Data Tables (1)

Full Response Text

Freedom of Information
Seyrsnys Fysseree

The Treasury Government Office,
Douglas Isle of Man, IM1 3PU

Telephone: (01624) 685605 Email: FOI.Treasury@gov.im

Government Website: www.gov.im

Our ref: 5247929 12 February 2026

Dear ###,

We write further to your request, received 22 January 2026, which states:

"I would like to know how many tax returns are submitted annually on the IOM, and out of those returns, how many (or what percentage) just contain information submitted by an employer with regards to income, and how many continue additional income. What I am trying to understand is the administrative burden placed on the individual tax returns department to assess if significant savings of personnel could be made, if a system similar to the UK was implemented where only people with additional income on top of their salary have to submit a self assessment tax return."

Clarified on the 29 January 2026 to add: Can this please cover the previous tax year, 2023/2024.

Our response to your request is as follows:

I have detailed below the information that is being released to you:

The latest Income Tax Division information for the 2023/24 tax year shows a total of 61,225 tax returns were submitted approximately two thirds of which were submitted online. 13.7% recorded employment income as the only source of income. The remaining 86.3% of returns contained more than one income source and/or tax deductions, such as mortgage, personal pension premiums etc.

Please quote the reference number 5247929 in any future communications.

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I will now close your request as of this date.