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Brighton Office: 01273 202311

Wimbledon Office: 020 8946 1212

Self Assessment Tax Return Services

At Hartley Fowler, our dedicated team delivers personalised Self Assessment tax return services designed to meet the unique needs of each client.

Our specialist Self Assessment tax return accountants provide comprehensive services for:

  • Individuals and sole traders
  • Partnerships
  • Limited Companies

The Benefits of Professional Self Assessment Tax Return Services

It is essential that your personal tax Self Assessment is completed correctly and filed on time. If you fail to do so, you may face penalties or HMRC making extensive enquiries regarding your tax position.

Our Self Assessment tax return services offer peace of mind by:

  • Accurately completing your personal tax Self Assessment
  • Submitting your return to HMRC within the deadline
  • Retaining backup records for the appropriate period of time

Expert Self Assessment Tax Return Accountants

As well as completing your return, our experienced self assessment tax return accountants take the stress out of the process by providing:

  • Advice and guidance on your tax liabilities, ensuring that you are aware of your obligations
  • Support in negotiating with the collecting tax authorities, if necessary
  • Identifying valid tax planning opportunities to optimise your tax position
  • Completing all the necessary tax computations
  • Dealing with all correspondence from HMRC promptly, saving you hassle.

Choose our Self Assessment Tax Return Services

If you have any questions about our services or need further advice, please call us today:

Personal tax return services – Wimbledon office: 020 8946 1212
Personal tax return services – Brighton office: 01273 202311

Alternatively, book a free consultation with our self assessment tax return accountants today.

Frequently Asked Questions

Do you need an accountant for a Self Assessment tax return?

It depends on your personal circumstances. If your finances are straightforward, you might manage it yourself. However, working with a self-assessment tax return accountant can offer valuable benefits, including:
Expert financial advice
Peace of mind that your return is accurate
A review of your bookkeeping to ensure all income and expenses are correctly recorded

Do I need to register for Self Assessment?

Yes, if you’re required to complete a personal tax self assessment and haven’t filed one before, you must register with HMRC by 5th October. To check whether you need to send a tax return before registering, click here.

Do I need to do a Self Assessment if I am not self-employed?

Typically, if you’re not self-employed, you won’t need to file a Self Assessment. However, you may still be required to if you:

Receive income from land or property in the UK 
Receive taxable foreign income above £300
Sell shares, property or other assets that are subject to Capital Gains Tax
Are the director of a company 
Have an income over £100,000 per year
Receive any taxable income which hasn’t been taxed.

What information do you need for a Self Assessment tax return?

Before applying online, you’ll need:

Your ten digit Unique Taxpayer Reference (UTR)
Your NI number
Details of your untaxed income from the tax year
Records of any expenses related to self-employment
Any contributions to charity of pensions that might be eligible for tax relief 
P60

When do I have to complete a Self Assessment tax return?

You must complete a Self Assessment tax return if you’re self-employed and receive a ‘notice to file’ from HMRC. You may also need to file if you have untaxed income. Common reasons include:
Being a partner in a business 
Being a company director and have income on which tax is due that is not taxed under PAYE
Have property income
Want to claim tax relief on employment expenses over £2,500 per year 
Have to pay a tax charge on your child benefit 
Have untaxed savings income 
Have capital gains tax to pay 

Discover more about when a self assessment tax return is required, here.

How do I work out my Self Assessment bill?

Your Self Assessment bill includes Income Tax and, if you’re self-employed, National Insurance (NI). HMRC calculates your bill by:
Adding up your taxable income
Subtracting allowable expenses, capital allowances, and your personal allowance
Including Class 2 and Class 4 NI if you’re self-employed
Deducting any tax you’ve already paid

The final figure is the total amount you owe for the tax year.

Can I amend my Self Assessment tax return after I have submitted it?


Yes. If you’ve already filed your initial tax return online, you can make amendments using HMRC’s Self Assessment portal within 12 months of the deadline. For paper returns, contact HMRC to request an SA100 form, complete the corrections and send the updated pages for processing.

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