In the end, it was officially declared a legal entity after passing the Ministry of Law and Human Rights verification on 7 October 2016.

[9] After being officially declared a political party participating in the 2019 elections, PSI immediately made a breakthrough in the selection of legislative candidates.

The selection process of legislative candidates was held transparently, openly, and broadcast live on all PSI's social media.

In the 2020 Indonesian local elections, PSI held Pilkada conventions for the cities of Surabaya and South Tangerang.

[10][11] On 3 October 2022 in an online press conference, PSI Vice Chairperson of the Board of Trustees, Grace Natalie, stated that the Indonesian Solidarity Party officially endorsed and gave support to Central Java Governor Ganjar Pranowo as a presidential candidate and Yenny Wahid as a vice presidential candidate in the 2024 elections.

PSI’s previous presidential candidates included Ganjar Pranowo, Mahfud MD, Tito Karnavian, Sri Mulyani, and Erick Thohir.

[14] The selection of Ganjar as the presidential candidate was determined through the Rembuk Rakyat screening mechanism which began in February 2022.

Grace Natalie said this was because PSI believed that Anies had committed a "great sin" against democracy in Indonesia during the DKI Jakarta regional election.

[18][19] As claims of putting the banners illegally emerged, PSI stated that it was a part of the Rembuk Rakyat process.

[25][26][27][28] In the 2024 legislative elections itself, PSI won 4,260,169 votes or 2.81%, below the parliamentary threshold and hence failing to place its members in the national House of Representatives.

[30] Following Prabowo's election as president, PSI secretary-general Raja Juli Antoni was appointed Minister of Forestry in the Red White Cabinet.

[34] At the start of the pandemic, PSI administrators and legislators across Indonesia distributed personal protective equipment (PPE) and masks to health workers.