PLEASE NOTE: The charity TaxAid advises only those people on low incomes whose problems cannot be resolved with HMRC.

Why not just keep quiet about my income?

Undeclared income guide

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If HM Revenue and Customs finds out that you have not declared income on which tax is due, you may be charged interest and penalties on top of any tax bill, and in more serious cases there is even a risk of prosecution and imprisonment.

HMRC actively search for non-registered businesses and un-declared or under-declared income. Information can come from a variety of sources: on-line search, door to door enquiries, reports from members of the public or from relatives, information from other government departments, investigations into other businesses, among others.

HMRC uses very sophisticated software called Connect. This analyses large volumes of information, detecting patterns, connections and inconsistencies to flag up possible tax evasion. HMRC also has extensive information gathering powers to access information on such things as debit and credit card sales and details of on-line selling.

The situation is very serious, but you will generally benefit from disclosing the position to HM Revenue and Customs as soon as possible because:

It may also help to know that HM Revenue and Customs will often try to reach an agreement with you regarding your outstanding tax that reflects your ability to pay.

If you have received a letter saying that HMRC suspects you have been involved in tax fraud, you should consider the guidance on the HMRC website page ‘admitting tax fraud’ at  https://www.gov.uk/guidance/admitting-tax-fraud-the-contractual-disclosure-facility-cdf . You may be able to avoid prosecution by completing a Contractual Disclosure Form. You should take professional advice before doing so. This will help to ensure that you disclosure is full and complete.