"Many will see their monthly repayments double or even triple when their current deals end," she said.
"Because mortgage interest is no longer an allowable tax expense, many landlords face a stark choice between selling up, or trying to pass their ballooning costs on to their tenants.
"The risk is that we see available stock shrinking and rents going into overdrive. This is now a fast developing story which policymakers cannot afford to ignore."
Justin Moy, founder at Chelmsford-based EHF Mortgages, called for stability among fixed rate mortgage products, warning the bigger problem would be the affordability assessments and stress testing on both residential and buy-to-let mortgages, "as the amount you can borrow will inevitably reduce again".
carmen.reichman@ft.com
