'£700m in Gift Aid unclaimed by charities'
14 January 2013 Last updated at 11:36 GMT
Phil Jarrold, deputy chief executive for the Wales Council for Voluntary Action (WCVA), says an estimated £700m in Gift Aid is unclaimed by charities in Wales and England.
Under the scheme introduced in 1990, charities can claim 25p from every pound donated to them from HM Revenue and Customs (HMRC), but must provide evidence of donations to qualify for the tax benefit.
Here, Mr Jarrold told Felicity Evans on Good Morning Wales that advice was still being given to charities to show them how to claim.
It comes as Cardiff-based children's charity The Joshua Foundation has owed between £300,000 and £400,000 to HMRC for over-claimed Gift Aid for a decade.