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B. TRUST FUND FINANCIAL OPERATIONS IN 2018

Table II.B1 shows the income, cost, and asset reserves for the OASI, the DI, and the combined OASI and DI Trust Funds in calendar year 2018.

Table II.B1.—Summary of 2018 Trust Fund Financial Operations

[In billions]

		OASI	DI	OASDI
Asset reserves at the end of 2017		$2,820.3	$71.5	$2,891.8
Total income in 2018		831.0	172.3	1,003.4
	Net payroll tax contributions	715.9	169.2	885.1
	Interest	80.7	2.6	83.3
	Taxation of benefits	34.5	.5	35.0
	Reimbursement from General Fund of the Treasury	a	a	a
Total cost in 2018		853.5	146.8	1,000.2
	Benefit payments	844.9	143.7	988.6
	Administrative expenses	3.8	2.9	6.7
	Railroad Retirement financial interchange	4.8	.2	4.9
Net increase in asset reserves in 2018		-22.4	25.6	3.1
Asset reserves at the end of 2018		2,797.9	97.1	2,894.9

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Table II.B2.—Payroll Tax Contribution Rates for 2018

[In percent]

	OASI	DI	OASDI
Payroll tax contribution rate for employees	5.015	1.185	6.20
Payroll tax contribution rate for employers	5.015	1.185	6.20
Payroll tax contribution rate for self-employed persons	10.030	2.370	12.40