Isle of Man self-employed tax: what applies to you
Self-employed on the Isle of Man? There is no HMRC Self Assessment: you file with the Assessor of Income Tax. 2026/27 tax, NI, VAT, records and deadlines.
Tally Up Blog
6 October tax deadline checklist for Isle of Man sole traders
A tickable checklist for Isle of Man sole traders getting ready to file their self-assessment by 6 October. Income, expenses, categorisation, paperwork, and what to hand over to your accountant.
How do I put vehicle, property or job details on my invoices?
Job records lets Manx sole traders keep a custom list of the vehicles, properties, pets or equipment they work on, with fixed fields and per-visit fields, so invoices show the right details automatically without retyping.
How do I bulk enter transactions as an Isle of Man sole trader?
Posting on Tally Up in spreadsheet mode
Easy transactions import into Tally Up
The new import tool takes a CSV file and turns it into properly categorised income and expense records, with minimum manual entry required
What is the 6 October deadline and what happens if you miss it?
6 October is the most important date in your calendar. It is the deadline for filing your self-assessment tax return
How does mileage work for Isle of Man sole traders?
IOM Mileage business v personal for sole traders
What tax will I owe as an Isle of Man sole trader? Income tax, NI and Payment on Account explained
Three payments for sole traders
Using QuickBooks or Xero on the Isle of Man? Here's what to watch for
QuickBooks, Xero and FreeAgent are fine for tracking income and expenses, but their tax estimates assume UK rates. Here's a 2026/27 UK-vs-IoM side-by-side for Manx sole traders.
What is the Isle of Man tax year and what are the key dates?
The four Isle of Man tax dates every sole trader needs in the diary — 6 April (year starts), 5 April (year ends), 6 October (filing deadline, £100 penalty if missed), and 6 January (Payment on Account).