Your homestead is completely exempt from Missouri property tax if you are a former prisoner of war with a 100 percent total service-connected disability.
Apply through the county assessor's office where the property is located, not the state. Use the Missouri State Tax Commission directory to find your assessor and ask them about the filing deadline for your county.
Documentation of your prisoner of war status, your VA letter showing a 100 percent total service-connected disability, and proof that you own the home and live in it.