Banks are finding the home loan market stacked in their favour after years of low mortgage rates, but are also aware that bigger mortgage bills could spell trouble for cash-strapped customers. But the higher rates will hit borrowers hard. Mortgage payments as a proportion of gross household income were on average around 20% in June, according to BuiltPlace, a property market consultancy. They could rise to around 27% - the highest since the early 1990s - if mortgage rates were to rise to 6%, the consultancy said. The rise in mortgage rates will be a blow for millions of households' finances, Sue Anderson, head of media at debt charity StepChange said.

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