The Billings house you didn’t buy in 2003
A $300,000 house at 2003’s average index level, tracked to 2026 Q2.
The metro index went from 141.2 (the 2003 average) to 418.0 in 2026 Q2, 3.0× its 2003 level. That makes a $300,000 purchase about $887,856 today.
With 20% down ($60,000) and a 30-year loan at 2003’s average rate of 5.83%, today’s equity is about $790,626, 13× the down payment.
The same $60,000 down payment, put in an S&P 500 index fund instead (the TSP C Fund, dividends reinvested), was worth $734,578 at the end of August 2026, the latest month the fund has reported at tsp.gov.
Run your own numbers for 2003 →
House figures are estimates for the whole metro market, from the FHFA index. Not financial advice.
FAQ
What is a 2003 Billings house worth today?
About $887,856 for a $300,000 house, a 3.0× market multiple to 2026 Q2 by the FHFA all-transactions index for Billings, MT.
Why use an index instead of listings?
The FHFA index is built from repeat transactions on the same homes, so it controls for the mix of what happens to be for sale.
Is this investment advice?
No. This is historical arithmetic for education and entertainment.