That money was to be given in $2 billion annual installments of Foreign Military Financing, or FMF, grants over five years.
Republicans accused Biden's administration of failing to advocate strongly enough for the Taiwan grants, given that his fellow Democrats controlled both the Senate and House last year.
"Securing FMF funding is always a challenge given the tight budget constraints, even for priority partners like Taiwan," said Eric Lee of the Project 2049 Institute think tank.
"I would prefer to see a revival of FMF grants, but with clear strings attached," said Michael Hunzeker, a Taiwan military expert at George Mason University.
Grants to buy specific weapons could be made on condition of Taiwan showing further moves toward asymmetric defense, he said.