Self Assessment Personal tax late filing penalties for the year ended 5th April 2010
After the next 31st January 2011 £100 (nil if no tax is payable; but this will only be agreed after the return is filed)
A special situation applies if you file on 1st February; the return is late but the £100 penalty is not charged. Being late extends the enquiry window from one year to eighteen months. See enquiry and investigation penalties below.
After the following 31st July 2011 another £100 (nil if no tax is payable)
For partnerships, fixed penalties apply separately to the partnership return and the return for each of the partners.
There is no partnership penalty exemption for nil tax.
Self Assessment Personal tax late payment penalties
Tax paid later than 28th February 2011 5% of tax
After the following 31st July 2011 another 5% of tax.
See paying Self Assessment Tax
Late payment penalties are avoided if you reach agreement under the Business Payment Support Service in advance of the due date.