NOTE: You must use Form 103 – Long if: a. You are a manufacturer or processor; b.INSTRUCTIONS: This form must be filed with the township assessor, if any, or the county assessor of the county in which the property is located not later. Tangible personal property tax exemptions for small businesses is a highly economical way of reducing taxpayer compliance burdens. File your Business Tangible Personal Property (BTPP) tax return online HERE or download a printable copy of the return HERE to submit a hard copy. Federal Form 4562; or; Federal Schedule L of Form 1120. (e) "Storage" does not include the keeping or retaining of tangible personal property for sale in the regular course of business. Business Tangible Personal Property. Business personal property deals with the physical assets used in the operation of the business. The. Property Tax Code is covered in detail in the publication entitled New Mexico.