COLOMBO, Jul. 26 (Reuters) - Sri Lanka will hold presidential elections on Sept. 21, a government notice said on Friday, setting the date for a crucial vote expected to determine the future of reforms in the South Asian nation weathering its worst financial crisis in decades.

Nominations for the election have to be submitted on Aug. 15, with incumbent President Ranil Wickremesinghe becoming the first candidate to do so by paying a non-refundable deposit to the election commission, his office said.

Wickremesinghe, 75, took office in July 2022 after widespread protests caused by the debilitating financial crisis forced his predecessor Gotabaya Rajapaksa to flee the country and later resign.

Parliament elected Wickremesinghe to serve out the rest of the five year-term vacated by Rajapaksa who was elected in November 2019.

"This is a critical time for Sri Lanka," said Bhavani Fonseka, senior researcher for Colombo-based Centre for Policy Alternatives.

"An election being called is extremely important for democracy but now the election commission must be allowed to do what they are mandated to do. Having a free and fair election is essential."

Almost 17 million of Sri Lanka's 22 million population are eligible to vote in the poll.

Helped by a $2.9 billion International Monetary Fund (IMF) bailout programme, Wickremesinghe has stitched back the shattered economy, bringing down inflation from a steep 70% in September 2022 to 1.7% in June, strengthening the rupee and rebuilding previously decimated foreign exchange reserves.

Sri Lanka's economy is expected to grow 3% in 2024 after shrinking 2.3% last year and 7.3% during the height of the crisis.

Bilateral creditors including Japan, China, and India signed up to a $10 billion debt rework last month, which gave Colombo breathing space to defer repayments for four years and save $5 billion. But Sri Lanka still has to put the finishing touches on a preliminary agreement with bondholders on restructuring $12.5 billion of debt ahead of a third IMF review later this year.

Higher taxes imposed under the IMF programme, prolonged inflation, and a stagnant job market caused by the grinding crisis has plunged a quarter of the population into poverty and pushed thousands to migrate.

Opposition leader Sajith Premadasa and parliamentarian Anura Kumara Dissanayake who heads the Marxist-leaning Janatha Vimukthi Peramuna (JVP) are expected to tap into this discontent as they make their presidential bids.

Both Premadasa and Dissanayake have publicly said that they will look at revamping the IMF programme to reduce the cost of living pressures on Sri Lankans and ease the country's debt repayment burden.

Sri Lanka's recovery is still very fragile and attempts to reverse the reforms could precipitate a new crisis, analysts say. The new government will need to ensure the reforms are taken forward and concluded to transform the economy and put it on a positive track, they say.

"What we require from this election is for the progress we have seen to continue," said Raynal Wickremeratne, co-head of research at Softlogic Stockbrokers. "Sri Lanka is not in a position to attempt trial and error."

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