Common Tax Return Mistakes (And How to Avoid Them)

Filing your tax return doesn't have to be a nightmare, but every year, thousands of UK taxpayers make simple mistakes that cost them money, time, and unnecessary stress. At Nunns Accounting Services, we see these errors repeatedly – and the good news is they're entirely preventable.

The Top 5 Tax Return Mistakes We See Every Year

1. Missing the Self Assessment Deadline.

The 31st January deadline isn't negotiable. Miss it, and you'll face automatic penalties starting at £100, escalating to £1,600 or 5% of your tax bill - whichever is higher.

2. Incorrect Income Reporting

Many people forget to include:

• Rental income from property
• Freelance or side-hustle earnings
• Interest from savings accounts
• Dividend income from investments

3. Claiming Invalid Expenses

Not everything is tax-deductible. Common invalid claims include:

• Personal meals and entertainment
• Commuting costs to your regular workplace
• Clothing (unless it's protective workwear)
• Fines and penalties

4. Poor Record Keeping

HMRC can investigate up to 6 years back. Without proper records, you can't defend your claims or prove your income figures.

5. DIY Complex Returns

If you have multiple income sources, rental properties, or run a business, attempting a DIY return often leads to costly mistakes.

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