Rail Employer Reporting Instructions

Part III - Principles of Service and Compensation

Chapter 4: Taxable Compensation under the Railroad Retirement Tax Act (RRTA)

1

Regulations under the Railroad Retirement Tax Act (RRTA) 

The retirement, survivor, and disability benefit programs under the RRA are funded by mandatory 

employment taxes on both employees and employers under the Railroad Retirement Tax Act 

(RRTA). Under the current provisions of the RRTA, Tier I and Tier II compensation is subject to 

tax rates and earnings bases in effect when payment is made. Taxation under the RRTA is on a 

"paid basis" and is always in terms of the payment year. 

Earned vs. Paid Compensation 

When crediting compensation under the RRA, employers may choose to credit compensation 

either to the period in which the services were rendered, "earned basis" or to the period in which 

payment is made, "paid basis". 

Note: Service months are always creditable to the month when earned. 

Example of Earned vs. Paid Reporting 

An employee earns $400/week and is paid biweekly. The pay period for the last two weeks of the 

calendar year ends December 26, 2004 and the paycheck is issued on January 7, 2005 of the new 

calendar year. If the employer reports compensation on a paid basis, the $800 is reported for 2005 

and will be counted toward that year's maximum earnings base. If the employer reports 

compensation on an earned basis, the $800 compensation amount earned in the final pay period 

of December is reported for 2004 and is counted toward 2004's maximum earnings base. In either 

case, taxes from that paycheck must be withheld at the 2005 tax rates and a service month is 

reported for December because the employee rendered service in December. 

Earned vs. Paid Reporting under the RRTA 

If compensation is reported on an earned basis (consistent with service months), the tax treatment 

of a payment made in a different calendar year than the year it is reported, may not be consistent 

under the RRTA with the manner in which the payment is credited as compensation under the 

RRA. If on the other hand, compensation is reported when paid, it will not necessarily be linked 

to the service period that is reported for that compensation. See Part IV, Chapter 1 for information 

about an employer's earned/paid election, and reporting RUIA compensation and employee rights 

to earned/paid election. 

IRS Jurisdiction 

The RRTA is administered by the Internal Revenue Service (IRS). The RRB has no authority to 

provide definitive answers to railroad retirement tax questions. A staff member in the Quality 

Reporting Service Center (QRSC) may be able to assist you with basic information about railroad 

retirement taxes. If not, you will be referred to a railroad retirement tax specialist at the IRS. 
Rail Employer Reporting Instructions

Part III - Principles of Service and Compensation

Chapter 4: Taxable Compensation under the Railroad Retirement Tax Act (RRTA)

2

Excess Tax Withholding from a Single Employer 

Employees who have paid Tier I and/or Tier II employment tax in excess of the annual maximum 

from a single employer must seek their refund from that employer. 

Excess Tax Withholding in Multiple Employer Situations 

Employees who have paid employment tax for Tier I, or Tier II, in excess of the annual maximum 

taxable amounts because they had two or more employers in a calendar year, and the sum of their 

earnings exceeded the maximum creditable amount, should claim an income tax credit for excess 

Tier I taxes withheld on their annual tax return with the IRS. Complete Form 843, Claim for 

Refund and Request for Abatement to request a refund of excess Tier II taxes withheld. 

Instructions on how to compute the credit amounts are in IRS Publication 17, Your Federal Income 

Tax. QRSC has developed a worksheet to help employees determine their tax credit. The 

worksheet is specific for each year's tax return. To request a worksheet for a specific tax year, 

contact: 

Quality Reporting Service Center

Railroad Retirement Board 

844 North Rush Street 7th Floor

Chicago, Illinois 60611-1275

Phone: (312) 751-4992 

Fax: (312) 751-7123 

Email: QRSC@rrb.gov

There is no provision for a credit or refund of Tier tax to the employers in this situation.