What the US is Borrowing Money For

Budget (in $ Bils)
FY 2018

Revenue* Total Mandatory Interest Discretionary %
Individual Income Taxes 1,660 1,414 246 49.7%
Payroll Taxes (Social Security & Medicare) 1,179 1,140 35.3%
Corporate Income Taxes 218 64 154 6.5%
Misc 0 0 0
Excise, Excise, Interest 283 283 8.5%
Custom Duties 0 0 0%
Leglislative Proposals 0 0 0%
Total Revenue* 3,340 2,593 310 437 100%
Spending Total Mandatory Interest Discretionary %
Social Security, Pensions, Sickness, Disability 1,045 1,045 25.0%
Medicare & Healthcare 1,182 1,182 0 27.3%
Defense, Military and Economic Aid 691 10 681 16.6%
Veteran's Benefits 177 100 77 4.2%
Interest 310 310 7.4%
Welfare 354 354 8.5%
Transportation 94 94 2.3%
Community Development 54 54 1.3%
Education 112 112 2.7%
Government 55 55 1.3%
Protection 42 42 1.0%
Agriculture, forestry, fishing 35 35 0.8%
Other 21 21 0.5%
To be allocated to Mandatory 256 256 -256 0.0%
Total Spending 4,173 2,593 310 1,270 100%
Proposed 2017 Deficit -833 0 0 -833

* Note: Revenue components are not specifically allocated in the budget. The above allocations are estimates assuming mandatory entitlement spending is covered first then interest and the remiander is applied towards Discretionary Spending. $256 Bil. of the amounts listed in Discretionary Spending are for Mandatory Spending in certain line items. The breakdown of how much for each line item was not available at the time the chart was updated.

Sources: USGovernmentSpending.com, The Balance, National Priorities and Wikipedia