Rev. Rul. 56-412

An amount retained by a collection agency as a charge for collecting for a retailer the balance due on credit sales of articles subject to the retailers excise tax does not constitute a bona fide discount, rebate, or allowance within the meaning of section 6416 of the Internal Revenue Code of 1954. Therefore, no credit or refund of the tax paid on the full selling price of taxable articles is allowable to the retailer for the reason that a portion of that selling price is retained by the collection agency.