Salary Arrear without Bill

BHARAT MEHRA (13 Points)

30 June 2019  
Sir,
I have not received my arrear of 6 Months for FY2018-19. Do I have to pay tax including arrear's amount.
Even though I don't know what exactly will be my arrear amount.
Case -
I worked in a xyz company from May 2018 to Sep 2018. (Gross salary for period is 150000 approx)
then I switched to another company but in new company I have not received my Salary from sep 18 to Mar 19.
My question is can I pay my tax in next AY when I will receive this period arrear.