From 1 April 2014 you can only claim donation tax credits within a period of four years, following the year in which the gift was made.
You can only claim tax credits for donations that are unconditional gifts.
You belong to a charitable organisation and donate money towards a project the group is working on. If your donation doesn't entitle you to receive anything in return, it's an unconditional gift.
Donations that are unconditional gifts can include:
You belong to a charitable organisation and pay to advertise your business in their monthly magazine. This is not an unconditional gift because you receive something of value in return, so you can't claim a tax credit for it.
Donations that aren't unconditional gifts can include: