In theory every cost you pay as an owner, you pay as a renter - just with less time investment as a renter. It's a convenience fee.
Most folks in the United States have fixed rate mortgages. So at the very least, the two largest portions of a person's payment will not go up: principal and interest.
The last two (or three, if you include HOA dues) generally go up over time, especially in places like Texas that use property taxes in lieu of a state income tax. Insurance will go up too, as the actual amount the policies cover (e.g. the cost of replacing the house) rise over time as well.
Edit: here's a concrete example: https://imgur.com/a/cGQm4U0
> Value often increases over time as well but this isn't cash in hand over the course of living in a house.
You can "cash out" the value increase without having to actually sell the property by remortgaging the house, but that only makes sense when rates are low.
…per month.
My taxes went up quite a bit this year, which reflects in the monthly payment. Of course the mortgage part of it stays the same, but the overall monthly payment which includes the taxes and insurance goes up.
Principle and interest are fixed for most people. Mortgage insurance, as an example, is fixed. Everything else is variable.
The vast majority of buyers will see huge changes (increases) to their property taxes and insurance over the lifetime of a mortgage.
There’s also opportunity cost from all the upfront and ongoing capital, and homeowners practically never include that in their monthly costs estimates. Opportunity cost grows over time, too. Not just from compounding growth, but from maintenance and repairs that you otherwise wouldn’t make.
TLDR owning a home isn’t a fixed cost, and it’s usually way more expensive and variable than people are admitting or calculating.
In almost every single test I’ve done, buying becomes way cheaper than renting and investing the difference after 5-10 years. Pretty much the only case where renting gets ahead is basically if the house appreciates less than the rate of inflation (again, painting broad strokes here, please do not interpret me too literally), or if one wants to move too frequently (my case).
This is not because housing is some magic investment, but because fixed cheap leverage is. If I could get a 30 year fixed-rate cheap non-callable loan to invest in market indexes, it would be a similar situation, but margin is an incredibly riskier different instrument.