When you donate, the DGR will usually issue you with a receipt, but they don't have to. How much in donations can I claim on tax without receipts?You can only claim a tax deduction for gifts or donations to organisations which are deductible gift recipients (DGRs). Tax deductible donations give your refund a boost. How much can I claim without receipts? Understand what a charitable donation is and how to claim a tax deduction without a tax receipt with IRS Form 8283.