Hi Apurva,

The starting salary of a military doctor or a MBBS doctor in Indian Air Force is INR 57,800 per month. After 4 years of service you will be promoted to Major Rank with monthly salary of INR 71,500. After 7 years of service as Major, you are promoted as Lieutenant Colonel and then your pay becomes Rs.1,24,800 per month. The salary increases as the rank increases further also.

Refer here for more info - https://www.afmc.nic.in/admissions/AFMC%20MBBS%20Information%20Brochure%20%202019.pdf

Feel free to ask doubts in the Comment Section.

I hope this information helps you.

Good Luck!