I'm curious is there not a property tax effect? Here where I live in Illinois I pay property taxes on my home. Where I live it is currently about 4.4% of my home's real value every year. I am able to deduct it from income only for state income tax purposes. There are limitations there that I don't reach based on my income but also I can only do so for a small handful of connected parcels. So in your case you would only be able to deduct for one of your homes. Can you please explain how it works where you live?

Additionally for a home sale in US I have to treat it as income for income tax purposes. In my state there are state, county, and often local transfer taxes as well. Here $1 for every $1000 of sale price to the state and an additional 50c for every $1000 to the county are typical numbers. There are also a number of other fees like recording fees, but those are flat rates.