The UK's six largest lenders will proactively contact 1.6 million mortgage borrowers whose fixed-rate deals expire this year, following discussions with Chancellor Rachel Reeves. The move brings long-awaited clarity for borrowers facing the sharp gap between historical rates and today's market, where average mortgage costs have climbed to 5.5% according to recent market data.

Through the Mortgage Charter (a government initiative that protects borrowers facing rate renewals), lenders now offer three key protections for borrowers approaching rate maturity. First, you can lock a new rate and switch deals up to six months before your current deal ends with the same lender - a significant advantage if rates begin to fall. Second, you can do this without triggering fresh affordability checks, removing a barrier that typically delays applications. Third, you can temporarily move to interest-only payments for six months without damage to your credit score.

The timing matters. Approximately one million of these maturing mortgages originated at ultra-low rates around 1.58%. For a typical £200,000 BTL (buy-to-let) mortgage, the difference between 1.58% and 5.5% translates to roughly £630 extra per month in interest costs alone. That's the kind of number that changes your cash flow and forces serious portfolio decisions.

Evidence of borrower strain already exists in the figures. According to FCA data covering the two months to December 2025, over 230,000 borrowers locked into new rates early - a sign that savvy investors aren't waiting for letters to arrive. Lenders themselves report increasing customer contact requests, though lending remains stable and arrears stay low overall. According to Mortgage Solutions' analysis, approximately 86% of all mortgages currently carry fixed rates, meaning the 2026 maturity wave will be substantial.

Chancellor Reeves stated: "In uncertain times, people need clear reassurance and practical help." The six-bank commitment addresses both. Clear communication removes the guesswork. Practical help means you can act months before your deal ends, not days.

If you're in mid-application or planning a deal, expect lenders' outreach calendars to influence their availability and focus. With 1.6 million borrowers to contact, capacity pressures will increase through spring and summer 2026. If your deal is rate-sensitive - if monthly payment assumptions lock in your returns - you may wish to contact your lender's mortgages team. You already know your rate maturity date. There is little reason to wait for the outreach letter before starting conversations about early lock-in options.

The Mortgage Charter removes friction at exactly the moment when friction matters most. Early lock-in without affordability re-checks means you can test scenarios and commit to better rates months before forced action. The lender contact push ensures borrowers know the option exists.