How TDS deduction for employee joined in the middle of FY without form16

AmoghaMBA
Hello,
Company intro: LLP company from TN, yet to get registered under PF, GST etc .
1. Tds: How TDS/IT is calculation for the employees who joined the organisation in middle of the F.Y.(2018-19) and not submitted the previous employer deduction details like form16.
For eg:
An employee joined in Nov2018 with a salary of 90K per month(Currently no PF,PF deduction in our company) and had declared 80K under 80C etc and there is no form 16 from his previous employer.
How should I calculate the IT now. Please guide.
2. Since salary for march 2019, will be paid in 2nd or 3rd of april 2019, should i take the TDS count from April18 to Mar19 or Mar18 to Feb19. ?
Regards,
Amogha
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