If you're employed by two companies, your Professional Tax (PT) is calculated based on the slabs applicable to the salary each company pays you. Generally, you cannot have PT deducted by both employers. If you provide proof of PT deduction to your second employer, they won't need to deduct it again, even if the second employment is part-time.
02 October 2021
If employee submits the document of PT deducted to second employer, then no need to deduct PT twice. (second employment can be part time)