Business Tax Extension Deadline 2025 Uk. With only one week to go until the 31 january self assessment deadline, the 3.8 million people yet to file their tax return are urged to act now or risk facing a £100 penalty. The 2025 deadline to file individual income tax returns for 2023 is april 15, 2025.

This guide provides a detailed overview of business tax deadlines in 2025 for small businesses, offering clarity and assistance for the upcoming tax season. Staying organised and knowing your due dates helps you maximise cash flow and avoid penalties or extra costs.