Self-Assessment Mistakes That Could Cost You: Advice from Bolton Accountants

Learn the most common self-assessment mistakes and how Bolton accountants at YRF help you avoid penalties, overpayments, and missed deductions.

Call 01204 938696 or email info@yrfaccountants.com

Business owner in Bolton struggling with self-assessment tax return

Every year, thousands of self-employed individuals and small business owners in Bolton miss tax deadlines or submit inaccurate tax returns — often without even realising it.

Let's explore the most common self-assessment mistakes, how they can cost you money (or worse), and what a professional accountant can do to help.

Why Self-Assessment Is a Big Deal

If you're:

  • A sole trader
  • A landlord
  • A company director
  • Or someone earning over £1,000 outside PAYE…

...you likely need to submit a self-assessment tax return. This isn't just admin — it's a legal obligation, and HMRC is quick to fine those who get it wrong.

The Top 5 Mistakes We See in Bolton

  1. Missing the 31 January deadline
    • Even one day late = £100 penalty.
    • Delay past 3 months = fines grow quickly.
  2. Underreporting income
    • Side income, rent, dividends, or foreign income — HMRC has ways to find them.
  3. Incorrect or excessive expense claims
    • “Business use” of your phone or home needs to be calculated properly.
  4. No receipts or records
    • You need to keep proof of your claims for at least 5 years.
  5. Using the wrong tax code or forgetting payments on account
    • This can lead to surprise tax bills later.

How a Bolton Accountant Prevents These Mistakes

With YRF Accountants, you get:

  • Accurate income reporting and expense tracking
  • Deadline reminders and timely submission
  • Maximised tax savings
  • Expert advice if you receive an HMRC letter
  • Peace of mind if your accounts are reviewed

Explore our full Self-Assessment service for details.

Should You Do It Yourself?

If your tax affairs are simple, self-filing is possible — but for many, the risk isn't worth it. Hire a local Bolton accountant if you:

  • Own property
  • Run a business
  • Work in CIS
  • Have foreign income
  • Are unsure what you can claim

Don't Wait for a Penalty Letter

We help dozens of people across Bolton file their self-assessment stress-free.

Get in touch or call 01204 938696 and let us take the pressure off.