Hi LinJo, Thanks for your questions.
There are many items/deductions in between from gross pay to net take home pay. If possible, you should compare the pay stub from the prior company with that of new company, and identify the big ticket items of change that result in a much smaller take home pay.
In general, commission based employees are "Statutory Employees" who also file Schedule C, Profit and Loss from Business. And the employer withholds social security and Medicare taxes,
https://www.irs.gov/businesses/small-businesses-self-employed/statutory-employees
Once you identify the item being "Federal income tax withheld", you can evaluate and re-submit a new W-4 to adjust it.
Form W-4 Employee’s Withholding Certificate
https://www.irs.gov/pub/irs-pdf/fw4.pdf
Hope the above helps.
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