This is not what you asked about, but your description of your donations makes me wonder whether your cash donations are deductible at all. In order to deduct a cash donation of any amount you must meet two requirements.
(1) You must give the money to an organization that is authorized by the IRS to accept tax-deductible contributions, AND
(2) As Opus 17 mentioned earlier, you must have a receipt from the organization showing the name of the organization and the date and amount of the donation. Your own records of your donations do not meet this requirement. The receipt has to come from the organization.
If you hand a $100 bill to a beggar or a homeless person on the street, that is not a deductible donation because the person is not an authorized organization. (Also, a donation for the benefit of a specific person is not deductible, even if the donation is made to an authorized organization.)
If you put a $100 bill in a charity box, or in the collection plate at a church, the church or other organization is an authorized organization, but you cannot deduct the donation because you don't get a receipt. In a question that you posted a couple of years ago you said that you make cash contributions to a religious institution and don't get a receipt. You cannot deduct those contributions because you don't have a receipt, even though the religious institution is authorized to accept tax-deductible contributions.
If you give cash to someone who says he or she is collecting money for charity, the person may be giving the money to an authorized organization. But you cannot deduct the donation unless you get a receipt from the organization. A receipt from the person who is collecting the money does not meet the requirement.
