How do I allow my donation to be included in Gift Aid? When you first donate to Send a Cow we will ask you to fill in a Gift Aid declaration form. You need to make a Gift Aid declaration for each charity you donate to. If you haven’t filled in a form please contact us and we can organise one for you. You can include all donations from the last four years, but do let us know if there are any tax years where you didn’t pay enough tax to claim.