It would not be technically correct to just report the net income as sales, although it may result in the correct amount of income and self-employment tax. Another consideration is sales tax. Depending on the sales tax laws where you operate, you may be required to pay sales tax on labor and parts, so in that case you would want to report them separately in the case of a sales tax audit.
Also, in the case of an IRS audit, you wouldn't want your sales reported to be less than what you collected and deposited into your bank account, as that may require a lot of reconciling to substantiate your sales reported on the tax return.
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