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What part of buying a house would make my net worth go down?
Buying a house can definitely make your net worth go down because there are expenses involved (interest expense, closing costs, taxes, maintenance, etc.). So unless the house appreciates in value enough to offset these things, you will see a drop in your net worth from buying a house. More specifically it can have a negative impact on your net worth, since changes in your net worth are the cumulative result of all your inflows and outflows of money.