Depreciation as expense when renting out

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Hello,

I am moving to new house and would like to rent out my current property. There are a lot of articles that "depreciation" helps to even profit from rental with expenses.

Let's assume the property without land costs 275,000. If I can write off the 1/27.5 of its value...it is 10,000 of "expenses" every year.

Question and concern: What will happen in 20 years when I decide to sell that property for 275k? By that time I will depreciate 10k * 20yrs=200k. Does it mean that I have only 75k of my non-taxable money and 200k portion is kind of income that I need to pay a taxes?.. If my efficient tax rate 20%...it is 200k*20%=40k in taxes?!..

Thank you,

Alex