[5] On 11 July 2023,[4] with Lee's concurrence,[6] the CPIB officially began a criminal investigation into Iswaran's dealings with Malaysian billionaire Ong Beng Seng and his businesses, including Como Holdings (UK) and Singapore Grand Prix.

Lee also revealed that Iswaran's monthly ministerial pay had been reduced to S$8,500,[5] although he would continue to receive his full yearly allowance of S$192,500 as a Member of Parliament.

[17] The prosecution alleged that between 2015 and 2022, Iswaran had obtained as bribes items valued at more than S$384,000,[18] including hotel stays, private jet and business class flights to and from Doha, as well as tickets to the Singapore Grand Prix and various football matches and performances in the United Kingdom.

According to the CPIB, Iswaran had obtained nearly S$19,000 worth of valuables from businessman David Lum Kok Seng,[20] including several bottles of wine and whiskey, golf clubs, and a Brompton bicycle.

[26] Members of the courtroom gallery were heard gasping as the sentence was announced, while Iswaran's wife, Kay Mary Taylor, shook her head.

As Iswaran served with good behaviour and therefore eligible for parole after two-thirds of his stipulated jail term (equivalent to eight months), he was allowed to transition to the home detention scheme halfway through his reduced sentence.

The decision was made after the prison authorities took into consideration Iswaran's low propensity to re-offend, his strong familial support and that he did not commit any institutional offence during his incarceration.

"[31] The portfolios for Minister for Transport and Minister-in-charge of Trade Relations were subsequently assumed by Chee Hong Tat and Grace Fu respectively.

"[33] In his reply to Iswaran's letter of resignation, Prime Minister Lee wrote: "I am disappointed and saddened that you are leaving politics in these circumstances.

"[35] Following Iswaran's sentencing, Wong—who had since succeeded Lee as Prime Minister—admitted that he was "disappointed and saddened", but added that "as painful as it is to act against a colleague and friend, it is our duty to do so when necessary.