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Bloomberg reported that the Office for Budget Responsibility (OBR) had reduced its growth forecasts in data sent to Chancellor Rachel Reeves last week.
A leak inquiry will take place following reports that economic growth forecasts have been reduced by the government's financial watchdog.
Last week, the Bank of England halved its growth expectations for the UK - saying it would only increase by 0.75% in 2025, before increasing to 1.5% for the next two years.
Asked by committee chair Meg Hillier about the inquiry, the civil servant appeared to indicate about 50 people in the Treasury would have been able to see the forecasts.
