I retired from the Air Force on 1 Jun19. While active duty, my state of residence was TX. But, I moved to MA in Jul 19. Should I list TX or MA as my state of residence?

Since you have retired from the Military and have become a resident of MA, MA is now your state of residence.

 

Once you have left the military the state where you are living is now your resident state for tax purposes.

 

States that Do & Don’t Tax Military Retirement Pay
 

 

@Anton1