The speaker estimates that a 1-percentage-point interest-rate increase would raise the debt-service share of tax revenue from 20% to 25% over five years, while a 5-point increase would push it above 40%.

“um so you go from 20 percent of the supposed interest rates rise uh one percent then the um over a five-year basis the amount of the fraction of tax revenue that goes towards servicing the debt basically goes from 20 percent to 25 percent if they rise five percentages that would go towards like north of 40 percent but if you take into account the fact the government is borrowing two trillion dollars”