In many states, California being one of them, fabrication labor is considered a taxable labor. When you manufacture something or give creative input into a process, that labor may be taxable.
However, in California, assembly labor is taxable. The exceptions for taxable labor are repair and installation labor.
Independent contractors in California are subject to a 15.3% tax, 12.4% for Social Security and 2.9% for Medicare. And since you are considered to be both the employer and employee by the IRS, this makes you responsible for paying the total tax amount, plus estimated taxes.
Unlike many other states, California does not tax services unless they are an integral part of a taxable transfer of property.
In general, businesses which provide a service that does not result in a tangible good are exempt from sales tax, as it only applies to goods. For example a freelance writer or a tradesperson is not required to remit sales tax, although a carpenter making custom furniture is so required.
In general, construction labor is not taxable. Installation labor of a fixture in most cases is also exempt from taxation, but the fabrication labor involved in the creation of a fixture is taxable.
In general, construction labor is not taxable. Installation labor of a fixture in most cases is also exempt from taxation, but the fabrication labor involved in the creation of a fixture is taxable.
Sales tax generally does not apply to charges for installation labor. For example, tax would not apply to your itemized charges for installing a car stereo in a used car. Please note that it can be difficult to tell the difference between nontaxable installation and taxable fabrication on site.