I agree with @TaxGuyBill wages count as business income for purposes of section 179 so while your schedule C may show a loss you include wages reported on the return as part of business income offset by any schedule C loss.
here is what form 4562 says about business income for individuals for purposes of IRC sec 179. as stated 179 is limited to business income.
Individuals. Enter the smaller of line 5 or the total taxable income from any trade or business you actively
conducted, computed without regard to any section 179 expense deduction, the deduction for one-half of
self-employment taxes under section 164(f), or any net operating loss deduction. Also, include all wages,
salaries, tips, and other compensation you earned as an employee (from Form 1040, line 1). Do not reduce this amount by unreimbursed employee business expenses. If you are married filing a joint return, combine the total taxable incomes for you and your spouse.
IRC REG 1.179-2
(c) Taxable income limitation -
(1) In general. The aggregate cost of section 179 property elected to be expensed under section 179 that may be deducted for any taxable year may not exceed the aggregate amount of taxable income of the taxpayer for such taxable year that is derived from the active conduct by the taxpayer of any trade or business during the taxable year. For purposes of section 179(b)(3) and this paragraph (c), the aggregate amount of taxable income derived from the active conduct by an individual, a partnership, or an S corporation of any trade or business is computed by aggregating the net income (or loss) from all of the trades or businesses actively conducted by the individual, partnership, or S corporation during the taxable year. Items of income that are derived from the active conduct of a trade or business include section 1231 gains (or losses) from the trade or business and interest from working capital of the trade or business. Taxable income derived from the active conduct of a trade or business is computed without regard to the deduction allowable under section 179, any section 164(f) deduction, any net operating loss carryback or carryforward, and deductions suspended under any section of the Code. See paragraph (c)(6) of this section for rules on determining whether a taxpayer is engaged in the active conduct of a trade or business for this purpose.
IRC REG 1.179-2(c)(6)
(iv) Employees. For purposes of this section, employees are considered to be engaged in the active conduct of the trade or business of their employment. Thus, wages, salaries, tips, and other compensation (not reduced by unreimbursed employee business expenses) derived by a taxpayer as an employee are included in the aggregate amount of taxable income of the taxpayer under paragraph (c)(1) of this section.
however, regardless of 179 or 168(k) the business must have commenced in 2021 to take the deduction.
