Last week, Shetti had announced snapping of ties with the BJP-led governments at the Centre and in Maharashtra, accusing the NDA of failing to honour its promises made to the farmers.
The decision to pull out of the NDA and the 'Mahayuti' (grand alliance) in the state was taken during a state-level executive meeting of the party in Pune on August 30.
Shetti handed over the letter to Fadnavis today at his official residence Varsha here today.
He had also said that the SSS had committed a "grave mistake" by extending support to the NDA, as "all the promises made to the farmers by the Centre and the state government in the election manifesto have failed to see the light of the day".
Earlier last month, the SSS had expelled Maharashtra Minister of State for Agriculture Sadabhau Khot, who was a party MLC, for "anti-party activities".
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