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Tax Return Deadlines & Penalties


If you are self-employed as a sole trader and earned more than £1,000 in the last tax year, or are a partner in a business partnership, you will need to submit a tax return.

Deadline for filing a tax return.

The deadline for filing your tax return online is 31 January (or 3 months after the date on your notice to complete a tax return if that’s later).

You may also need to submit a tax return if you receive other forms of untaxed income, for example:

  • Money from renting out a property

  • Tips and commission

  • Income from savings, investments and dividends

  • Foreign income

What you will need to file a tax return.

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  • P60 - ‘End of Year Certificate’,

  • P11D - ‘Expenses of Benefits’,

  • P45 - ‘Details of employee leaving work’,

  • Payslips

  • P2 - ‘PAYE Coding Notice’

  • Information about any redundancy or termination payments

  • Certificates for any Taxed Award Schemes

  • Any lump sum payments not included on your P60 or P45

  • Employee Share Scheme or Share-Related Benefits records

  • Benefits records

If you work for yourself:

  • Your profit or loss account or your business records

  • Your bank statements

  • Tax deduction certificates from the bank

  • Building society passbooks

  • Dividend counterfoils or investment brokers’ schedules

  • Personal pension contributions certificates

If you miss the deadline for submitting your tax return, or for paying your bill, you will be subject to a penalty

Fines for late tax returns

1 day late after deadline

£100 for one day after deadline

Up to 3 months late after deadline

£10 for each additional day (capped at 90 days), plus £100 initial fine - maximum of £1,000

6 months late after deadline

Either £300 or 5% of the tax due (whichever is higher), on top of the penalties above

12 months late after deadline

An additional £300 fine, or 5% of the tax due, plus the above penalties.

Fines for late payments

In addition to penalties for filing a tax return after the deadline, you may also receive a penalty for paying your tax bill after the deadline, plus interest on the outstanding amount.

30 days late after deadline

Charge equal to 5% of the tax outstanding

6 months late after deadline

A further 5%

12 months late after deadline

An additional 5%

Appealing a penalty

You can appeal against a penalty if you have a ‘reasonable excuse’ for filing a late return or a late payment.

What counts as a reasonable excuse?

  • Your partner or another close relative died shortly before the tax return or payment deadline

  • You had an unexpected stay in hospital that prevented you from dealing with your tax affairs

  • You had a serious or life-threatening illness

  • Your computer or software failed just before, or while you were preparing your online return

  • Service issues with HM Revenue and Customs (HMRC) online services

  • A fire, flood or theft prevented you from completing your tax return

  • Postal delays that you could not have predicted

  • Delays related to a disability you have

Need help with your tax return?

Running a business can be challenging and time consuming. At Styles & Associates Accountancy, our team can provide you with a fixed fee quote for filing your tax return to help you claim your tax refund or budget for your tax bill.  We provide a free consultation in person or over the telephone to discuss your requirements. Get in touch on 01420 541 554


At Styles & Associates we can provide full accountancy services, or a bespoke package to cover specific accounting requirements such as tax returns. 


Get in touch today to see how we can help your business.

Taxable Benefits

It feels like the team at Styles and Associates are an extension of my business. Not only is book keeping and accounting performed timely and accurately giving me management information I can rely on but I feel I always have someone to discuss ideas or problems with.

Gerry Budd

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