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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).

TL;DR — Four Isle of Man tax dates every sole trader must know: 6 April (tax year starts), 5 April (tax year ends), 6 October (filing deadline — £100 penalty if missed, plus a further £200 after six months), and 6 January (Payment on Account due). At a glance — 2026/27 deadlines and penalties Penalty figures from Keeping up-to-date — Assessor of Income Tax. Payment on Account details from the Isle of Man Government. If you are self-employed on the Isle of Man, four dates shape your…

Isle of Man self-employed tax: what applies to you

A clear guide to what applies when you go self-employed on the Isle of Man — income tax, Class 2 / Class 4 NI, VAT, record keeping, and the 2026/27 rates and deadlines you need in your diary.

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.