The Charity Finance Group has called on charities to work to increase understanding of Gift Aid among staff and volunteers as it runs its first Gift Aid Awareness Day.
The umbrella body’s initiative has been set up to try to change as situation in which an estimated £560m of Gift Aid goes unclaimed every year.
A report by HM Revenue & Customs in March said that Gift Aid was not claimed on about a third of eligible donations and almost a third of donors said their understanding of the scheme was "fairly poor".
The CFG’s resources include a one-page document of frequently asked questions about Gift Aid, a template declaration form and guidance to help charities register for Gift Aid and avoid incorrect claims.
The campaign is being promoted on social media platforms today using the hashtag #tickthebox.
Caron Bradshaw, chief executive of the CFG, said: "While promoting Gift Aid has been a priority for the CFG since it was introduced in 1990, today marks the start of a bold new campaign and an annual day of action to bring clarity to Gift Aid and educate everyone who generously donates to charity to make their donations go even further."