FILE PHOTO: A worker enters the Treasury building in London

LONDON (Reuters) - British public borrowing looks on course to overshoot official forecasts made earlier this year, even without taking into account the add cost of unrepaid student loans, Britain’s budget watchdog said on Tuesday.

Earlier on Tuesday the Office for National Statistics revised up its estimate of British government borrowing due to a change in how it treats student loans that are unlikely to be repaid, as well as an overestimate of corporation tax revenue.

“The effect on public sector net borrowing is likely of the order of at least 15 billion pounds a year,” the Office for Budget Responsibility said.

“Following these revisions, it now seems likely that borrowing will exceed our restated March forecast for 2019-20,” it added.