This document provides an overview and update on tax and gift aid rules from HMRC. Key points include: 1) Most companies must now file corporation tax returns online using iXBRL formatting, with exemptions for small charities. 2) The annual gift aid donor benefit limit will increase to £2,500 from April 2011. 3) From April 2013, charities can claim gift aid on up to £5,000 of small donations without declarations if registered with HMRC for 3+ years. 4) The substantial donor rules will be phased out and replaced with new "tainted donation" rules to determine if a donation loses tax relief.