Case-Shiller Home Prices vs Mortgage Rate
S&P Cotality Case-Shiller National Home Price Index (FRED CSUSHPINSA) measures average change in total value of all existing single-family housing prices across all 50 states. The 20-City Composite (Case-Shiller most-watched subset) covers 20 major metropolitan areas.
Also known as: Case-Shiller Home Price Index (home prices, Case-Shiller, house prices) · 30Y Mortgage Rate (mortgage rate, 30 year mortgage, mortgage)
Why This Comparison Matters
S&P Cotality Case-Shiller National Home Price Index (FRED CSUSHPINSA) measures average change in total value of all existing single-family housing prices across all 50 states. The 20-City Composite (Case-Shiller most-watched subset) covers 20 major metropolitan areas. January 2026: 20-City Composite +1.2 percent year-over-year (down from +1.4 percent December 2025). 30-year fixed mortgage rate (FRED MORTGAGE30US) currently 5.98-6.22 percent (Q1 2026 average 6.0-6.3 percent). The pair captures housing affordability dynamics. When both rise together, affordability deteriorates rapidly. When rates fall but prices hold, market finds support. The 2024-2026 era has produced historically poor affordability through combination of elevated prices (Case-Shiller +50 percent vs 2019) and elevated mortgage rates.
The April 2026 Configuration
S&P Cotality Case-Shiller 20-City Composite +1.2 percent year-over-year January 2026 (down from +1.4 percent December 2025). National Home Price Index annual change estimated +2-3 percent. 30-year fixed mortgage rate 5.98 percent (final week of February 2026) rising to 6.22 percent by mid-March 2026. Q1 2026 average mortgage rate hovered 6.0-6.3 percent. April 2026 mortgage rate stable in 6.0-6.5 percent range.
The combined April 2026 reading: home price growth modest (+1.2 percent YoY) with elevated mortgage rates (~6.1 percent). Housing market in late-cycle stabilization phase. Buyers facing affordability stress: median monthly payment on median-priced home approximately $2,700-2,900 (vs $1,200-1,500 in 2019-2021 era).
Next Case-Shiller release April 28, 2026 will provide February 2026 data. February-March 2026 mortgage rate decline below 6 percent (briefly) may have catalyzed modest home price acceleration in coming releases.
Home price growth has decelerated substantially from peak: 2021 +20 percent YoY, 2022 +18 percent YoY peak, 2023 +5-6 percent YoY, 2024 +6-7 percent YoY, 2025 +3-4 percent YoY, January 2026 +1.2 percent YoY. The deceleration reflects mortgage rate normalization plus supply constraints easing.
The Affordability Calculation
Housing affordability depends on three variables: home price, mortgage rate, and household income. Median home price (April 2026 estimated) approximately $420,000 nationally. Median household income approximately $80,000-85,000. Mortgage rate 6.1 percent average.
Monthly payment calculation: $420,000 home with 20 percent down ($336,000 mortgage) at 6.1 percent 30-year: monthly principal + interest approximately $2,030. Add property taxes (~$350), insurance (~$150), HOA (~$50): total monthly housing cost approximately $2,580. Required income for 28 percent debt-to-income ratio: $9,200 monthly = $110,000 annual.
The practical implication: median household income ($80,000-85,000) is insufficient for median home with 20 percent down at current rates. Buyers face options: (1) lower price tier homes ($300,000-350,000 range, more available); (2) higher down payment (30-40 percent reduces monthly); (3) builder-financed mortgage rate buydowns (1-3 percent of price); (4) ARM products (3-5 year fixed lower rate). Persistent affordability stress has compressed transaction volume to 50-year lows.
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Frequently Asked Questions
What are Case-Shiller and the 30-year mortgage rate?+
S&P Cotality Case-Shiller National Home Price Index (FRED CSUSHPINSA) measures average change in total value of all existing single-family housing prices across all 50 states. 20-City Composite covers 20 major metros. January 2026 20-City: +1.2% YoY (down from +1.4% December 2025); National estimated +2-3% YoY. 30-year fixed mortgage rate (FRED MORTGAGE30US) currently 5.98% (Feb 2026 first sub-6% since 2022) rising to 6.22% mid-March, hovering 6.0-6.3% Q1 2026 average. Case-Shiller monthly release (last Tuesday, 2-month lag from data); mortgage rates daily/weekly Freddie Mac PMMS.
How does affordability work?+
Three variables: home price, mortgage rate, household income. Median home ~$420,000; median income ~$80,000-85,000; mortgage rate 6.1% average. Monthly payment for $420K home with 20% down ($336K mortgage) at 6.1% 30-year: P+I ~$2,030 + property taxes ~$350 + insurance ~$150 + HOA ~$50 = ~$2,580. Required income for 28% DTI: $9,200/month = $110,000 annual. Median household income ($80-85K) insufficient for median home with 20% down at current rates. Buyer options: lower price tier ($300-350K), higher down payment (30-40%), builder rate buydowns (1-3% of price), ARM products. NAR Affordability Index ~95 (below 100 = unaffordable).
How do mortgage rates drive home prices?+
Inverse relationship at affordability margin. Rate increases reduce affordable monthly payments, reducing housing demand. Reduced demand pressures prices through reduced sales volume, extended marketing time, seller concessions, eventually price cuts. Transmission timeline: rate increase month 0; transaction volume decline month 1-3; days-on-market increase month 2-4; price cuts emerge month 4-6; Case-Shiller reflects month 6-9 (3-month MA of repeat-sale transactions). 2022 hiking: rates 3.0% to 7.8% peak. Case-Shiller decelerated +18% to -1% YoY (19pp swing). 2024-2025: rates 6.5-7.5%. Case-Shiller +5 to +7% YoY. 2026: rates 5.98-6.5%. Case-Shiller +1-3% YoY.
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