Mansion Tax Cutting London Luxury Prices Before It Exists

Anup Pankhania had to cut the offer price for apartments he’s developing in London’s Bloomsbury district by as much as 500,000 pounds ($805,000) because of a luxury-home tax that doesn’t exist yet.

The discounts are just one example of price increases for the best London homes stalling after more than five years of gains as investors wait to see if the U.K.’s Labour Party will take power next year and impose a promised annual “mansion tax” on properties valued at 2 million pounds or more. Owners of second homes who are based abroad would pay more than those who possess a single U.K. property and live in it.