Here's what happens if Trump can't pay his $454 million bond : NPR

"If he does not have funds to pay off the judgment, then we will seek judgment enforcement mechanisms in court," she said. "And we will ask the judge to seize his assets."

https://www.npr.org/2024/03/19/1239524037/heres-what-happens-if-trump-cant-pay-his-454-million-bond