UK Lenders Raise Mortgage Rates by Up to 0.35 Points as 2-Year Swaps Hit 4.22%

Q: For US buyers in the UK, what hidden tax risks does the 'foreign-mortgage currency trap' create beyond rising interest rates?

For US buyers in the UK, the bigger hidden risk is not just higher mortgage rates but a possible US tax bill on currency movements alone. If a buyer takes out a mortgage in pounds and the dollar later strengthens against sterling, the IRS can treat the mortgage payoff or refinance as creating a taxable foreign-exchange gain under Section 988. In practice, the borrower may need fewer dollars to repay the same pound debt than when the loan was taken out. That “gain” can be taxed in the US as ordinary income, even though no real investment profit was made. That is why advisers call it a trap: the tax issue is separate from the house itself. A US owner could sell a UK home and qualify for the main-home capital gains exclusion, yet still face US tax on the mortgage currency gain because the loan and the property are treated as separate items. The exclusion does not protect the mortgage-related gain. The rule is also one-sided. If exchange rates move the other way and the dollar weakens, the higher cost of repaying a personal foreign mortgage is generally not deductible. So borrowers can be taxed on gains but usually cannot claim relief for losses. This matters more in a market where UK lenders are raising rates and, in some cases, loosening affordability rules to support larger loans. A bigger pound mortgage may help secure a purchase, but for US buyers it can also increase exposure to this overlooked cross-border tax risk.

3 articles · Updated · Financial Times · Jul 17

Barclays, NatWest, Nationwide, Coventry Building Society and Virgin Money lifted fixed mortgage rates this week, reversing recent declines and raising borrowing costs for new and remortgaging homeowners.
Two-year UK swap rates climbed to 4.22% from 3.95% on June 26 as renewed Middle East hostilities rattled markets, pushing up the funding benchmarks lenders use to price fixed-rate mortgages.
Nationwide raised one two-year fix to 4.59% from 4.24%, adding about £480 a year on a £200,000, 25-year loan, while brokers warned more lenders are likely to follow quickly.
Borrowers still have some cheaper options—two-year fixes around 4.3% and tracker mortgages below 4%—especially if they expect the Bank of England to cut its 3.75% base rate later this year.
Even as rates rise, lenders are still competing selectively: Nationwide lowered the income threshold for six-times-salary loans to £75,000, and Lloyds offered Premier customers fixed deals starting at 4.13%.