Some economists expect higher taxes sooner rather than later.
"Big tax rises eventually will have to be announced, with 2022 likely to be the worst year, so that they will be far from voters' minds by the time of the next general election in May 2024," Samuel Tombs, at Pantheon Macroeconomics, said.
Public debt rose to 2.115 trillion pounds, or 97.9% of gross domestic product - a percentage not seen since the early 1960s.
The PMI survey and a separate measure of manufacturing from the Confederation of British Industry, showing factory orders suffering the smallest hit in a year, gave Sunak some cause for optimism.