Learn how to file a Self Assessment tax return for 2025/26. Step-by-step guide to HMRC deadlines, allowable expenses, tax payments and filing online.

What is tax deductible? Learn which UK business expenses you can claim, what HMRC disallows and how allowable expenses can reduce your taxable profit.

In this guide, we’ll walk you through how business car leasing works, the tax implications and whether it’s more beneficial than personal leasing.