Prime Minister Ranil Wickremesinghe said his government had inherited a "very bad situation" when it came to power early last year but that things were improving.
"We are turning the economy around," he said.
"We do not have a balance of payment crisis anymore. We may have had it before, but not now."
The news of a slowdown in growth from 4.9 per cent in 2014 came as Sri Lanka negotiates with the International Monetary Fund for a bailout to help fund substantial debt repayments.
But the bank said a slowing down of net foreign exchange inflows, including worker remittances, and capital outflows had generated a balance of payments deficit.
It came despite the welcome effect of a sharp drop in oil prices -- Sri Lanka is dependent on imported crude.
Sri Lanka sought an IMF bailout immediately after the new government took office in January last year but the fund turned down the request at the time, saying the country's reserves were at a comfortable level.
The IMF said two weeks ago that it was on track to agree a bailout loan for Sri Lanka that is expected to be worth just over USD 1 billion drawn over a period of 36 months.
But Wickremesinghe told journalists today it could take some time to finalise the deal.
"It will be worked out. Give us a few more months," he said.
But he conceded the country's revenues were inadequate to meet state spending.
