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Self Assessment Guide by Listentotaxman last updated on 02/10/2015

It is not just the Self Employed who are required to make an annual self assessment return. Many people who have their taxes collected through the PAYE system are still obliged to make a self assessment return, for example Company Directors; those with foreign income; those whose income exceeds £100,000 a year. As of 2013 a new group has been caught in the self assessment bracket, those parents affected by the new Child Benefit Charge (earning over 50k and still in receipt of child benefit). The means of collecting the new tax on child benefit is through self assessment. 

Anyone who completed a self assessment return last year, will be obliged to do so again this year. Once HMRC send you a self assessment form, you are legally obliged to complete and return it, whether online or by post, even if no tax is owing.

The deadline for paper (postal) self assessment returns is 31st of October. The deadline for making an online self assessment return is the 31st of January. Making an online self assessment return is a relatively straight forward task. You will need to have certain documents and information to hand, these are listed further on in this guide. Remember this deadline is for both the tax return and payment of tax owing.

Failing to make a return and pay any tax owing on time will result in hefty fines. Even if you don't owe anything in tax, you will still receive fines for not making a zero owing return. For an idea of late filing fines by HMRC see the bottom of this article. Getting your return in on time saves money. If you are late in making your return, don't delay any further as every day can be costly. Even if you can not afford to pay the tax owing, at least make a return without the payment and save yourself some of the fines.

Have you registered with HMRC to make an online Self Assessment return?

Please note that the steps bellow take some time so do not leave registering with HMRC for online returns until close to the 31st January deadline! HMRC advise registering by the 5th of October.

  • If making your first online return you will need to register with HMRC. For this you will need your National Insurance Number. You set up a username and password which you should keep a record of as you will need it to log on in future.
  • You will then receive an activation code in the post which you use to activate your account by logging on and inputting the code. This needs to be done within 28 days of receipt, or another code will have to be re-issued.
  • Once registered you will receive your ten digit  'Unique Taxpayer Reference' (UTRin the post. You will need this to make your return

Making your Return: what you need and some handy tips

There are certain documents and information which you will need access to in order to complete your return. If you are very close to the deadline and you can not get some of these important figures/documents, give a reasonable estimate. You can explain in the notes section on the form to HMRC that the figure is an estimate. Then log in as soon as possible with the accurate figure. Don't miss the deadline and incur penalties if you can avoid it.

  • Though the online deadline for return of your self assessment form is the 31st January, a handy tip for those who owe less than £3,000 is to complete your online return by the 30th December. If you do you can avail of the option to have HMRC collect the tax you owe through your tax code. This means tax payments would be spread throughout the year, rather than in one lump sum on January 31st.
  • Employment information- P60 (if you don't have it you could use a wage slip for the month of March, ie. just before the end of the tax year you are making a return to). If you can not find March's wage slips, statements etc., use the telephone to contact your employer to get the information.
  • Pension contributions, statements or receipts. If you can not find these, contact your pension fund manager and get the figures needed.
  • Bank interest certificate for information on income from savings. Also include any interest on investments and dividends (whether cashed or reinvested) on your return. Again, phone the bank if you can not find the certificate.
  • Information on income from letting property (or losses from it).
  • Figures for any other forms of income
  • Totals from previous submitted self assessment forms so you can see if there are previous losses which can be carried forward to offset against this years income. HMRC have information here on claiming losses against income for self employed.
  • Allowable expenses, both personal (pension contributions, charitable donations) and business.See our articles on allowable expenses for both Self Employed and PAYE paying employees.
  • Consider if Capital Gains applies to you this year, eg. have you sold a property? Or have you incurred a loss? If so you need to fill out the relevant section.
  • Do not round up your figures. HMRC have implied that rounding up figures is a sign that people have not been detailed in maintaining their accounts and could attract further attention from HMRC.
  • If you have gone over your allowable pension contribution, check previous self assessment returns as you may be able to carry forward unused allowances from previous years, see more here.
  • Check you have the right tax code. Your tax code determines how much tax is deducted from your wage or pension. If it is incorrect, you could be paying too much tax.

HMRC have a written guide on completing your return here.

Penalties for Late Return of Self Assessment (regardless of whether tax owing or not)

1st Feb, 1 Day late = £100 fine from the 1st February. 

1st May, 3 Months late = £10 a day fine up to a maximum of £900 (90 days) for every day it is late

1st Aug 6 months late = £300 fine or 5% of the tax owing, which ever is greater.

1st Feb 12 months late = another £300 fine or 5% of the tax owing, which ever is greater.

Penalties for Late Payment of Tax Owing

2nd March payment now 30 days late = 5% charge on the tax owing on that day

1st August payment now 6 months late = 5% charge on the tax owing on that day

1st Feb payment now 12 months late = 5% charge on the tax owing on that day.

Interest is charged on the tax owing including the amount levied in charges at a rate of 3%.

It should also be noted that if you make a return which is incorrect, and HMRC feel that you were either careless, or misleading them on the amount of tax you owe, they can charge a further 30% to 70% of the tax owing. In cases of deliberately concealing and misleading them they can charge 100% on top of the tax owed.

For more information on HMRC penalties and charges for late Self Assessment returns, see here.

This guide is sponsored by Churchill Knight & Associates Ltd, an established accountancy practice since 1998. Whether you just have rental income, a limited company, a pension fund, rental income, inheritance or capital gains, they are very happy to answer any questions you may have.

This article was published in our Guides section on 02/10/2015. today: 55,932 7 days: 56,048 31 days: 56,478