Generally, when installing or repairing tangible personal property, parts and labor are taxable. If the job is “labor only” it is not taxable, but the repairer must document that no parts or other items were incorporated into or attached to the repaired item.
The percentage of completion method is a revenue recognition accounting concept that evaluates how to realize revenue periodically over a long-term project or contract. Revenue, expenses, and gross profit are recognized each period based on the percentage of work completed or costs incurred.