Samuel Tombs, an economist at Capital Economics, said: "March's public finance figures suggest that the trend in the UK's fiscal position is continuing to worsen.
"Weaker-than-expected growth in tax receipts, reflecting the slow pace of economic recovery, has been offset by lower-than-anticipated growth in current expenditure for the year as a whole.
"But with the economic recovery continuing to stutter, we think it will become increasingly difficult for the Government to meet its ambitious deficit reduction plans in the coming fiscal year."
Government borrowing reduced by nearly £11 billion over the last financial year, despite a surprise rise in the figure for March.
Public sector net borrowing, excluding financial interventions such as bank bail-outs, was £18.2 billion in March, up slightly on a year ago and against City hopes of £16 billion, the Office for National Statistics (ONS) said.
But the Government still met the Budget day forecast, announced by its tax and spending watchdog, for borrowing of £126 billion in the year to the end of March.
This was down from £136.8 billion the previous year, after revisions in previous months.
For full details of the public sector finances visit the Office for National Statistics.
Public sector borrowing was £126 billion in the financial year to March, including £18.2 billion last month, the Office for National Statistics said.