@akumarv , generally agreeing with @Critter and noting information in your post, AND assuming that
(a) you are here on H-1B and your family ( spouse is here on a valid H-2 ( dependent visa )
(b) you are a Resident for tax purposes ( i.e. you have passed the substantial Presence Test )
(c) your spouse is away from the USA the last two months of the year but her main residence is with you in the USA
(d) that you have filed (and therefore the purpose of the ITIN for the spouse ) Married Filing Joint for 2018
therefore you would need to renew the ITIN of your spouse so you can avail of the MFJ filing status and all its benefits ( standard deduction etc. ); Personal and dependent exemptions are still valid but for the years 2018 through 2015 , the amount is reduced to Zero--- but standard deduction has been doubled.
The fact that your spouse is temporarily absent from the USA does not change anything as long as her dependent visa is valid and that her main home is your home.
Hope this clarifies your situation. Please feel free ask more questions in comment
Namaste ji
