The cuts have been made to its variable two-, three- and five-year fixed larger loan rates.
Tier one rates have been cut by up to 0.35%, tier two rates by up to 0.6% and tier three rates by up to 0.15%.
Larger loan rates begin from 5.24% fixed and 5.59% variable for tier one cases, with a fixed product fee of £2,495.
The standard residential rates for cases up to £3m are unchanged.
Iain Smith, Market Harborough Building Society’s head of mortgage distribution, said: “We’ve significantly lowered rates across our larger loan range. This opens the door for more clients looking to borrow between £3m and £5m and ensures we’re well-positioned to support those borrowers with both simple and more complex circumstances, including high-net-worth individuals and expats.
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“This follows a summer of enhancements across our residential solutions, which saw us acting on broker feedback to make it even easier for them to place their cases.”
Market Harborough Building Society recently increased its income multiples for selected products and its widened affordability and complex income criteria.