Income taxes - I do "the taxes" at year end not "my taxes" because we file as married. But when I was single I did "my taxes"

Sales tax, never. That's just "the sales tax"

Property tax, also I say "the property tax"

I do use "my taxes" or "our taxes" (the collective group of taxpayers) when complaining, like "why are my taxes used to blow up little kids and siphoned into the pockets of people who don't need the money?" Because it's money we earned and being used in ways most of us would strongly object to.