In September 2016, Soubry criticised members of Vote Leave when it became clear that the pledge "at the heart … of their message" of £350,000,000 a week of extra funding for the NHS was being dropped from post-Brexit plans. Following a leaked Treasury report which claimed that the estimated annual cost to the UK Treasury of a "hard Brexit" would be between £38bn and £66bn per year after 15 years, Soubry referenced the loss of money for schools and hospitals and stated that Parliament should be involved in the principles guiding Brexit negotiations.