Hi,
No you dont have to pay tax on what you have not received or likely to receive in future.
As you have not served for the remaining 45 days , you havent earned that Rs 90000.
Salary income is chargeable to tax on “due basis” or “receipt basis” whichever is earlier.
Income from salary taxable during the year shall consists of following:
i. Salary due from employer (including former employer) to taxpayer during the previous year, whether paid or not;
ii. Salary paid by employer (including former employer) to taxpayer during the previous year before it became due;
iii. Arrear of salary paid by the employer (including former employer) to taxpayer during the previous year, if not charged to tax in any earlier year;
in your case neither is the case. So You are not not liable to pay tax on Rs 90000