Rental Property & Taxes

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Very new to the real estate investing. We own 2 rental properties and own the house we currently live in. Last year, we only owed back around $100 for taxes. This year, our CPA is telling us we owe $4,000. We’re just confused why it is so much more this year and how other people with rental property ends up making a lot of money off of taxes. We are depreciating and writing off all expenses. I feel like we are just doing something wrong here, anybody a wizard with this?