Do you donate to charities either in cash or items? Can you remember what you donated? Do you know the value of the items you donated?
If the answer is no I have a few apps that may make it easier for you.
iDonatedit, $2.99 at ITunes. Tracks and values your donations. You can even add a picture of what you donated.
Donation Assistant, FREE for Google Play Store.
Try these out and let me know what you think.