The income your husband is receiving from sales commissions is self employment income, subject to self employment tax and reportable on Schedule C.
He is being paid on a 1099 for services provided, and to that extent he is an independent contractor.
The income for 2018 should have been reported on a Schedule C as well.
All earned income is subject to Social Security or self employment tax. If you are receiving earned income, you are either an employee or you are self-employed.
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