61 Pa. Code § 31.7
(a) Imposition. Imposition of use tax shall conform with the following:
(3) Purchasers who are licensed by the Bureau of Sales and Use Tax (Bureau) or who reside outside of this Commonwealth shall pay the tax directly to the Bureau. Purchasers who reside in this Commonwealth, except those who reside in Philadelphia County, shall be given the option under the law of paying the tax either directly to the Bureau or to the treasurer of the county in which they reside. The following are illustrations of transactions which give rise to tax liability. It is assumed in each example that the vendor has not collected sales tax from his purchaser:
Example 1. A resident of this Commonwealth purchases a radio from a New York supply house. The purchaser incurs use tax liability whether the purchaser brings it into the Commonwealth himself or has it shipped to him.
Example 2. A resident of this Commonwealth purchases a radio from a Commonwealth vendor who fails to collect tax on the transaction. The purchaser is liable for use tax.
Example 3. A company has offices in New York and this Commonwealth. It sends office equipment purchased in New York to its offices in this Commonwealth. The company incurs use tax liability on the equipment.
Example 4. A New York firm has salespersons soliciting orders in this Commonwealth. It purchases advertising displays in New York which it uses for promotional purposes in this Commonwealth. The company incurs use tax liability on the displays.
Example 5. A furniture manufacturer purchases lumber tax-exempt under a resale exemption certificate. It uses some of the lumber to repair its own office flooring. It incurs use tax liability on the lumber.
Example 6. A resident of this Commonwealth has his truck repaired in New Jersey. The resident incurs use tax liability on the repair charges when he brings his repaired truck into the Commonwealth.
Example 7. A contractor of this Commonwealth purchases plumbing materials from a New York manufacturer to install in houses the contractor is building in this Commonwealth. He incurs use tax liability on the materials.
Example 8. An Ohio contractor brings equipment and materials into this Commonwealth to use or consume in constructing an office building. He incurs use tax liability on the equipment and materials.
(c) Alternate imposition. Use tax is generally imposed upon the original purchase price of tangible personal property. Exceptions to this general rule are as follows:
(d) Exemptions. The provisions of this section are applicable, with the following exceptions:
This section cited in 61 Pa. Code § 31.5 (relating to persons rendering taxable services); 61 Pa. Code § 33.2 (relating to purchase price); and 61 Pa. Code § 60.16 (relating to Local Sales, Use and Hotel Occupancy Tax).