Sending thank you letters or notes to people who make a donation shows your appreciation and reinforces their goodwill about making a financial gift to charity. It is best to acknowledge the gift soon after it is received.
Thank you letters which are on the charity letterhead serve as tax receipts. This type of letter would also need to include the amount donated. Remember, if you are a volunteer fundraiser, the charity handles sending out official tax receipts. However, it could be nice to also send a thank you note if appropriate for your situation. This way, your donors will get a personal thank you from you, and a formal thank you from the charity.
Thank you letters can be handwritten notes or typed letters as long as you sign them.
Fundraising donation thank you notes can be a generic thank you note card. These are sold in quantity packs in retail stores. Just add your personal message inside.