Introduction IRS Publication 537 – Introductory Material Future Developments Reminders Introduction Installment sale. Comments and suggestions. Getting answers to your tax questions. Getting tax forms, instructions, and publications. Ordering tax forms, instructions, and publications. Useful Items – You may want to see: Publication 537 – Main Contents What’s an Installment Sale? Sale of inventory. Dealer sales. Special rule. Stock or securities. Installment obligation.