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I am unsure if I claimed Gift Aid when giving to charity during the 2016-17 tax year. I have looked through my emails and the charity certificates I have found have shown that I did not make any claims. I also don't believe I am eligible for claiming Gift Aid as I am under the tax threshold, however I am concerned that I did request it but just can't find any evidence. Is there a way of finding out if I have claimed it, and if I have what will that mean considering I don't earn enough to pay income tax (or any other form of tax which might make me eligible)?

Any help would be greatly appreciated.