Increasing Interest Cost On US Debt Will Account For A Quarter Of The Next Decade's Increase In Federal Expenditures: CBO

AS one can see from slide 4 of CBO's updated presentation on the US budget and economic outlook, interest cost increases on US debt will account for a quarter of all increases of federal outlays over the next decade, according to CBO's projections:

Source: CBO, slide 4

From Congressional Budget Office, "Press Briefing on An Update to the Budget and Economic Outlook" Presentation, August 27, 2014, by Douglas W. Elmendorf, Director:

Press Briefing on An Update to the Budget and Economic Outlook from Congressional Budget Office