30yr fixed closed at 6.56%, 10yr Treasury yield at 4.453% — a late-session selloff on geopolitical headlines and treasury auction pressure pushed yields to 10-month highs.

The day's arc: rates opened higher after CPI printed at 3.8% annually, held in a tight range through midday as the bond market digested the data, then broke in the afternoon. UMBS 5.0 fell 26 ticks on the day to close at 98.14. The 10yr Treasury finished at 4.453%, up 4.4 basis points. The 30yr conventional rate closed at 6.56% — the highest level since early March.

What moved markets in the afternoon wasn't inflation. It was a combination of geopolitical risk headlines and weak demand at the treasury auction. When a market is already reluctant to buy bonds at current yields, you don't need much to tip it. Auction concessions added fresh supply pressure, risk-off sentiment pulled capital away from rate-sensitive assets, and sellers controlled the tape into the close. The CPI data this morning was almost an afterthought by 3 PM.

For borrowers, 6.56% is a meaningful line. It matches the highest rate since March and extends the run of elevated borrowing costs through peak spring buying season. Buyers still floating after today absorbed a full week's worth of move in a single afternoon. Retail sales data later this week is the next real test — a soft print could give bonds room to recover. A strong one won't.

— David Burson, NetRate Mortgage