LISBON - Portugal swung to a budget surplus of 1.1% of gross domestic product in the 12 months ended in September from a deficit of 3.9% a year ago, with revenues boosted by high inflation and strong economic growth, official data showed on Friday.

The National Statistics Institute said the budget surplus came thanks to a 2.9% increase in revenues, while public expenditure only grew by 0.7%.

In the 12 months through the end of the second quarter, Portugal already had a surplus of 0.2%.

(Reporting by Sergio Goncalves; editing by David Latona)