Government borrowing rose last month, marking the third-highest September since records began in January 1993.
Official figures show that borrowing – the difference between spending and tax revenue – reached £16.6bn last month.
The Office for National Statistics (ONS) said the figure was £2.1bn more than September last year.
This is the last official set of public finance figures until the Budget next week, with the Treasury expected to change its own self-imposed debt rules.
