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Are You Prepared for the Self-Assessment Deadline?

Who needs to complete the self-assessment?

You will need to complete a self-assessment if:

  • Your self-employment income is more than £1,000
  • You’ve received more than £2,500 from untaxed income such as commission or tips
  • Yours (or your partners) income was over £50,000 and one you claimed for child benefits
  • Your taxable income was over £100,000
  • You had an income from abroad that tax needs to be paid on

For the full list of individuals who need to file the self-assessment click here.

When must it be complete?

Self AssessmentDeadline
Self-assessment registration deadline5 October 2018
Paper tax returnsMidnight 31 October 2018
Online tax returnsMidnight 31 January 2019
Pay the tax you oweMidnight 31 January 2019

What information is needed?

You will need to obtain bank statements to work out your income and expenditure. Other amounts you may need to work out are:

  • Your Self-employment income this is calculated by
    Invoices – business expenses = self-employment income
  • Your second or untaxed income, if you have a second job you will need to ask your employer for a P60
  • Income from dividends; provide references to all the dividend reference numbers
  • Your untaxed overseas income; you will need to provide information on how much you are earning. HMRC are cracking down on tax avoidance of overseas income – read more here  

Above we have listed only some of the income information you need to provide HMRC. It is important you contact your bank and other organisations immediately so they can provide you with the information you require before the deadline.

Overwhelmed? Take a deep breath, and pick up the phone; give us a call on 01295 477 250 if you require help filing your self-assessment deadline.

What are the penalties for late submission?

Late filingPenalty
Miss filing deadline£100
 30 days late5% of the tax due
3 months lateDaily penalty £10 per day for up to 90 days (max £900)
6 months late5% of the tax due or £300, whichever is  greater
12 months late5% or £300 whichever is greater. If you are seen to be deliberately withholding information, you may have to pay 100% of the tax due.
12 months & taxpayer deliberately withholds informationBased on behaviour: deliberate and concealed withholding 100% of the tax due, or £300 whichever is greater. deliberate but not concealed 70% of the tax due, or £300 whichever is greater reductions apply for prompted and unprompted disclosures.

If you need help completing your self-assessment please contact us on 01295 477 250 alternatively you can email


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