Government-sponsored enterprises (GSEs) like Fannie Mae and Freddie Mac guarantee conforming mortgages that they securitize against default. They might ultimately be backed by the US Treasury and thus US taxpayers (if not in theory, then in practice).
However, when inflation is high, the burden on the borrower of paying off their fixed-rate mortgage goes down (as their income increases faster over time). Therefore, the borrowers are less likely to default during high inflation. Thus, having the GSEs guarantee these mortgages is not a subsidy that protects middle class borrowers from inflation. High inflation essentially eliminates the need for the guarantee by itself.
[1] https://www.fhfa.gov/mobile/Pages/public-affairs-detail.aspx...
The reason fixed mortgage rates have been below inflation recently is because the financial industry (bond buyers and mortgage underwriters, at least) have largely bought the Fed's "transitory" narrative. A 3% mortgage remains profitable if inflation runs at 8% for a year and then returns to 2%; it becomes very unprofitable if inflation stays at 8%. The reason mortgage rates have climbed so much in the last couple months is because the "transitory" narrative has basically collapsed, and the bond markets are now starting to price an extended period of high inflation into the rates they charge.
I don’t know how more clearly I can state why this is a glaring subsidy for the rich. I’m sure in a free market these would just appear by themselves /s
There is some historical validity to the point that fixed-rate mortgages existed because of taxpayer subsidies. The creation of the FHA during the New Deal, and Fannie-Mae shortly after that, basically jumpstarted the practice. But there's a difference between jumpstarting the a market and continued subsidy of it. The existence of jumbo loans is an indication that even without taxpayer subsidies, fixed-rate mortgages still exist, presumably because the expectation of price stability means that private institutions don't think that the risk of interest rate variability is that great (jumbo mortgage borrowers usually pay about 0.5% more, so that's the implied risk premium). This can change during times of high price variability - my parents mortgage was 13.5% back in 1978, because expected inflation was about that. But that also indicates that interest rate risk is primarily absorbed by the private markets, and taxpayer subsidies play a relatively small part in it.
Fixed rate mortgages are the norm in multiple EU countries (i have one in France and it's pretty much the only option).
How do taxpayers subsidize fixed-rate mortgages in the US?