Tx notes fa22 Final

8. Error or mistake claim 
The time limit is 4 years from the end of the tax year to correct errors in a tax return when the tax 
would otherwise be overcharged, for 2022/23 this will be 5 April 2027.
9. Compliance Checks 
HMRC can enquire into a taxpayer return by written notice:
(a)
Within 12 months following the date the return is actually filed.
(b)
An enquiry may be made due to:
‣
A suspicion that income is understated
‣
Deductions being incorrectly claimed
‣
Other information in HMRC’s possession
‣
Being part of a random review process
10. Discovery assessments 
(a)
If HMRC do not begin a compliance check within the time period allowed they may still issue a 
discovery assessment at a later date to prevent the loss of tax.
(b)
If HMRC believe that not enough tax has been assessed for an accounting period they can 
make a discovery assessment to collect the tax. 
(c)
A discovery assessment can only be made if: 
HMRC could not reasonably be expected to have been aware of a loss of tax and are supplied 
with information to draw their attention to a contentious matter such as the use of a valuation 
or estimate. 

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HMRC can raise an assessment within 4 years from end of the tax year if there is no careless 
or deliberate behaviour by the taxpayer. This increases to 6 years from the end of the tax year if 
there is careless behaviour, and 20 years from the end of the tax year if there is deliberate error 
or failure to notify a chargeability to tax.