The Hidden Tax Mistakes Limited Company Directors Make (and How to Avoid HMRC Penalties)

Running a limited company in the UK comes with flexibility and tax advantages — but it also comes with responsibility.

Many company directors unknowingly make tax mistakes that lead to HMRC penalties, interest, and unnecessary stress.

At Estandz Place Consulting Ltd, we regularly help directors fix issues that could have been avoided with the right guidance. Below are the most common hidden tax mistakes — and how to stay compliant.

1. Mixing Personal and Business Money

One of the biggest mistakes directors make is using the company bank account like a personal wallet.

Examples include:

Paying personal bills from the company account

Transferring money without recording it properly

Withdrawing funds without understanding tax consequences

Why this matters:

HMRC expects a clear separation between you and your company. Poor records can trigger enquiries and lead to incorrect tax filings.

How to avoid it:

Use a dedicated business bank account

Record director withdrawals correctly

Get professional bookkeeping support early

2. Paying Yourself Incorrectly

Many directors either:

Pay themselves too much salary

Ignore dividends planning

Or withdraw money without understanding tax implications

This can lead to:

Overpaying tax

Late payroll submissions

Unexpected personal tax bills

How to avoid it:

A balanced mix of salary and dividends, planned correctly, can significantly reduce tax while staying compliant.

3. Missing Corporation Tax Deadlines

Corporation Tax deadlines are strict:

CT600 return due 12 months after accounting period

Corporation Tax payment due 9 months + 1 day after year end

Missing either can result in:

Automatic penalties

Interest charges

HMRC compliance flags

How to avoid it:

Maintain accurate bookkeeping throughout the year

Don’t wait until year-end to review figures

Work with an accountant who tracks deadlines for you

4. Incorrect Expense Claims

Not all expenses are allowable, even if they feel business-related.

Common errors include:

Claiming personal expenses

Incorrect home office calculations

Overclaiming travel or subsistence

Why this matters:

Incorrect expense claims can lead to adjustments, penalties, and loss of HMRC trust.

How to avoid it:

Always ensure expenses are:

Wholly and exclusively for business

Properly documented

Reviewed by a professional

5. Ignoring VAT Responsibilities

Some directors delay VAT registration or misunderstand VAT rules.

This can cause:

Backdated VAT bills

Penalties for late registration

Cashflow problems

How to avoid it:

Monitor your turnover regularly

Register for VAT on time

Get advice on the right VAT scheme

6. Leaving Everything Until the Last Minute

Last-minute accounting leads to:

Errors

Missed reliefs

Higher fees

Stress and poor decisions

The truth:

Good tax planning happens throughout the year, not just at year-end.

How Professional Support Protects You

Working with a qualified accountant helps you:

Stay compliant with HMRC

Reduce tax legally

Avoid penalties

Gain clarity and peace of mind

At Estandz Place Consulting Ltd, we support limited company directors across Sunderland, the North East, and the UK with:

Bookkeeping

Payroll & dividends

Corporation Tax (CT600)

VAT

Full compliance management

Need Help Reviewing Your Company Tax Position?

If you’re unsure whether your company is fully compliant — or want to avoid future HMRC issues — we’re here to help.

👉 Book a free 15-minute consultation to review your situation and get clear, honest advice.