Essential business expenses to include on your self assessment tax return

If you’re completing your Self Assessment tax return yourself, one of the most valuable things you can do is make sure you’re claiming all the business expenses you’re entitled to. These legitimate costs can reduce your taxable profit and, therefore, the amount of tax you’ll pay.

Self Assessment myths debunked: what’s true and what isn’t in 2025

If you’re completing your Self Assessment tax return yourself, it can be difficult to know what’s accurate and what’s just hearsay. Friends, social media, forums and even “well-meaning” advice can easily lead to confusion and, in some cases, unintentional mistakes.

Your Self Assessment Survival Guide: 12 common mistakes to avoid in 2025

Completing your own Self Assessment tax return is absolutely doable but, without the help of an accountant, it’s easy to fall into traps that could cost you time, money or even trigger unwanted attention from HMRC.

Whether you’re a freelancer, landlord, side hustler or someone with additional income or gains outside of PAYE, here are 12 of the most common mistakes people make when filing their Self Assessment tax return and how you can avoid them in 2025.

The 10 essentials to complete your Self-Assessment tax return for 2024/25

ESSENTIAL INFORMATION YOU’LL NEED TO COMPLETE YOUR SELF ASSESSMENT TAX RETURN

Completing a Self Assessment tax return is much easier when you have all the right information to hand before you start. Whether you’re employed, self-employed, a landlord, investor or someone with multiple income sources, gathering your documentation early can help you avoid mistakes, reduce last-minute stress and ensure you don’t miss anything important.

Budget 2025 - reaction and analysis

Chancellor Rachel Reeves delivered her second Budget on Wednesday 26 November 2025, introducing £26.1 billion in annual tax rises by 2029/30. While Labour's manifesto pledge not to increase income tax, National Insurance or VAT for "working people" remained technically intact, a raft of measures will significantly impact your clients' tax planning strategies. Here's the comprehensive update for accountants and their practices.

What you missed: The Fusion Report

Fusion 25, The first TaxCalc/Engager joint event was more than a conference, it was also a celebration.  

Big changes at Companies House as mandatory ID checks loom

Stay ahead of significant compliance changes with Companies House’s new identity verification (IDV) regime, set to take effect from 18th November 2025.

From this date, all new and existing company directors, LLP members, and Persons with Significant Control (PSCs) must complete mandatory ID checks—redefining onboarding and ongoing compliance requirements. Whether you’re an accountant, ACSP, or company administrator, understanding your new responsibilities is critical: registration, record keeping, and helping clients navigate this new process will become essential parts of your workflow.

Discover what’s required, the methods available for ID verification, and how to prepare your practice to meet government standards. Plus, find out how TaxCalc can help you embrace these changes, streamline verification and maintain your compliance edge. 

Paul Evans joins TaxCalc as our new CEO

We are excited to announce that Paul Evans has joined TaxCalc as our new Chief Executive Officer. Paul’s arrival signals a pivotal moment as we continue to build on our reputation for delivering trusted, innovative solutions to accountants and tax professionals across the UK.