Sara Duterte's impeachment trial comes down to one charge: 817 million pesos of unexplained wealth, 14 Senate votes and the 2028 race

What is Sara Duterte on trial for? Now, just one thing: unexplained wealth. House prosecutors have dropped three of the four articles of impeachment against the Philippine vice president and are staking the case on a forensic estimate of 817 million pesos in assets that, they say, her income cannot explain, lead prosecutor Gerville Luistro told Reuters via The Straits Times on 10 November. "We're all in," she said.

The stakes go far beyond one office. Duterte, the daughter of former president Rodrigo Duterte, has consistently led opinion polls for the 2028 presidential election, which President Ferdinand Marcos Jr. cannot contest. A conviction could remove her from office and bar her from holding public office, ending that bid. She denies wrongdoing and calls the proceedings political harassment. Her defence began presenting evidence on 9 November.

Why prosecutors dropped three charges

The House originally sent four articles of impeachment to the Senate. In October, prosecutors withdrew the three covering alleged misuse of public funds, bribery and threats. Luistro said pursuing every charge would give the defence more to contest and could push the trial into 2027, when attention shifts to the 2028 campaign. "Impeachment fatigue is real," she said, pointing to investigations dating back to 2024.

The decision was strategic but risky. Japhet Quitzon of the Center for Strategic and International Studies said dropping the other charges, including Duterte's alleged threats against Marcos, the First Lady and a former House speaker, may have cost prosecutors a "significant piece of narrative". Those threats, captured on video, raised questions about her conduct and suitability for the presidency, not just her finances.

The prosecution's bet is that documents are harder to argue with than politics. Unexplained wealth cases turn on numbers, and Luistro argues that numbers speak for themselves. The defence's task is to show that the gap between declared income and assets has innocent explanations, or that the forensic estimate is wrong.

The evidence: SALNs and 817 million pesos

Luistro said the charge rests mainly on documentary evidence: Duterte's statements of assets, liabilities and net worth, known as SALNs, corporate financial statements, tax and property records, firearms registrations and financial transaction reports. She stressed that Duterte herself prepared, signed and filed the asset declarations, and that her long experience in government made it hard to blame any omission on oversight.

A forensic analyst has estimated 817 million pesos, about 16.6 million Singapore dollars, in unexplained assets. The defence disputes the figure. "Numbers do not lie," Luistro said, a line that will be tested as the defence calls its own witnesses to explain property records and payments.

In the Philippines, public officials must file SALNs every year, and a failure to declare assets truthfully can itself be grounds for removal. That is why the trial has focused on the small details of property listings and local government records, details that are dull in isolation but central to the question of whether her declarations were accurate.

The trial has been stripped down to a spreadsheet. Whether 14 senators read it the same way will decide not only a vice presidency but the shape of the 2028 election.

The witnesses this week

On Tuesday 10 November, a defence witness produced one of the trial's odder moments. John Kenneth Enumerables, the assessor of the Island Garden City of Samal, testified that a property in Duterte's 2025 SALN matched local tax records in assessed and market value, but that his records placed it in Barangay San Isidro, while the SALN listed Barangay Matanos, BusinessWorld reported.

Under questioning from presiding officer Francis Escudero, the assessor said there was no barangay in Samal called Matanos. Senator judge Panfilo Lacson pointed out that Matanos is an area within Barangay Pangubatan, and told the witness that his office's records were "quite messy". The confusion may help the defence argue that discrepancies reflect sloppy local records rather than concealment.

Davao City accountant Vingelin Bajan testified that a 64,194.72 peso payment Duterte received from the city government in 2023 was a salary differential under the Salary Standardization Law, not a double payment. Senator judge Erwin Tulfo had earlier warned her that senator judges were losing patience and that she could be cited in contempt for dodging questions.

The 14 vote arithmetic

Conviction requires two thirds of the Senate. In September, the impeachment court ruled that only senator judges able to participate in the trial count toward that threshold. With four of 24 senator judges unable to take part, prosecutors need 14 votes rather than 16. "The number for conviction was reduced, but we should not overlook the fact that the number for acquittal was also reduced," Luistro said.

The vote will be shaped by politics as much as evidence. Quitzon said senators will weigh shifting alliances and their own interests ahead of 2028. "No political loyalty is permanent in the Philippines," he said. The Marcos and Duterte camps, once allies, have split bitterly, and senators must calculate which side is likely to dominate the next administration.

Possible outcomes include:

• conviction, removing Duterte from office and potentially barring her from future office
• acquittal, which would strengthen her position for 2028
• a verdict delayed into 2027, which prosecutors want to avoid
• a split Senate that leaves the case unresolved politically even after a vote

What it means for the Philippines

For the country, the trial is a test of whether impeachment can work as an accountability tool rather than a political weapon. Both camps accuse the other of the latter. A verdict based clearly on documentary evidence would strengthen institutions; one that looks like a partisan headcount would deepen divisions before 2028.

For investors, political uncertainty adds to an already difficult picture. The Philippine economy grew only 2.1 percent in the third quarter, its slowest since the pandemic, as we reported in our analysis of the Philippine slowdown and BSP rate hikes. A bruising succession fight could weigh further on confidence and on the peso.

The trial also unfolds as Southeast Asia's second vice presidential drama this week. In Indonesia, Vice President Gibran Rakabuming Raka has said he intends to step down after courts faulted his education documents, as we covered in our report on Gibran's intention to resign. Both cases show how dynastic politics and legal challenges are reshaping the region's leadership races.

Sara Duterte's fate now rests on one charge, a disputed figure and 14 votes. Prosecutors have traded breadth for speed, betting that documents will persuade a politically calculating Senate before the 2028 campaign begins. Whatever the verdict, it will shape who can run for the Philippine presidency and how voters judge the institutions that decided it.