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IRS.gov Website
Publication 505
taxmap/pubs/p505-018.htm#en_us_publink1000194784

Excess Social Security
or Railroad Retirement Tax Withholding(p49)

rule
Most employers must withhold social security tax from your wages. In some cases, however, the federal government and state and local governments do not have to withhold social security tax from their employees' wages. If you work for a railroad employer, that employer must withhold tier 1 railroad retirement (RRTA) tax and tier 2 RRTA tax.
taxmap/pubs/p505-018.htm#en_us_publink1000194785

Two or more employers.(p49)

rule
If you worked for two or more employers in 2013, too much social security tax or tier 1 RRTA tax may have been withheld from your pay. You may be able to claim the excess as a credit against your income tax when you file your return. Table 3-2 shows the maximum amount that should have been withheld for any of these taxes for 2013. Figure the excess withholding on the appropriate worksheet.
taxmap/pubs/p505-018.htm#en_us_publink1000194787

Table 3-2. Maximum Social Security and RRTA Withholding for 2013

Type of taxMaximum
wages
subject
to tax
Tax rateMaximum
tax to be
withheld
Social security$113,7006.2%$7,049.40
Tier 1 RRTA$113,7006.2%$7,049.40
Tier 2 RRTA$84,3004.4%$3,709.20
taxmap/pubs/p505-018.htm#en_us_publink1000194788
Joint returns.(p49)
If you are filing a joint return, you and your spouse must figure any excess social security or tier 1 RRTA separately.
Note.All wages are subject to Medicare tax withholding.
taxmap/pubs/p505-018.htm#en_us_publink1000194790

Employer's error.(p49)

rule
If you had only one employer and he or she withheld too much social security, Medicare, or tier 1 RRTA tax, ask the employer to refund the excess amount to you. If the employer refuses to refund the overcollection, ask for a statement indicating the amount of the overcollection to support your claim. File a claim for refund using Form 843, Claim for Refund and Request for Abatement.
taxmap/pubs/p505-018.htm#en_us_publink1000194791

Worksheet for
Nonrailroad Employees(p49)

rule
If you did not work for a railroad during 2013, figure the excess social security withholding on Worksheet 3-1.
Note.If you worked for both a railroad employer and a nonrailroad employer, use Worksheet 3-2, to figure excess social security and tier 1 RRTA tax.
taxmap/pubs/p505-018.htm#en_us_publink1000194795

Where to claim credit for excess social security withholding.(p49)

rule
If you file Form 1040, enter the excess on line 69.
If you file Form 1040A, include the excess in the total on line 41. Write "Excess SST" and show the amount of the credit in the space to the left of the line.
You cannot claim excess social security tax withholding on Form 1040EZ.
taxmap/pubs/p505-018.htm#en_us_publink1000194796

Worksheets for
Railroad Employees(p49)

rule
If you worked for a railroad during 2013, figure your excess withholding on Worksheet 3-2 and 3-3, as appropriate.
taxmap/pubs/p505-018.htm#en_us_publink1000194798

Where to claim credit for excess tier 1 RRTA withholding.(p49)

rule
If you file Form 1040, enter the excess on line 69.
If you file Form 1040A, include the excess in the total on line 41. Write "Excess SST" and show the amount of the credit in the space to the left of the line.
You cannot claim excess tier 1 RRTA withholding on Form 1040EZ.
taxmap/pubs/p505-018.htm#en_us_publink1000194799

How to claim refund of excess tier 2 RRTA.(p49)

rule
To claim a refund of tier 2 tax, use Form 843. Be sure to attach a copy of all of your Forms W-2.
See Worksheet 3-3 and the Instructions for Form 843, for more details.taxmap/pubs/p505-018.htm#en_us_publink1000194801
Pencil

Worksheet 3-1.Excess Social Security—Nonrailroad Employees

1.Add all social security tax withheld (but not more than
$7,049.40 for each employer). This tax should be shown
in box 4 of your Forms W-2. Enter the total here
1.
2.Enter any uncollected social security tax on tips or group-term life insurance on Form 1040, line 60, identified by "UT"2.
3.Add lines 1 and 2. If $7,049.40 or less, stop here. You cannot claim the credit 3.
4.Social security limit4.$7,049.40 
5.Excess. Subtract line 4 from line 35.
taxmap/pubs/p505-018.htm#en_us_publink1000194802
Pencil

Worksheet 3-2.Excess Social Security and Tier 1 RRTA—Railroad Employees

1.Add all social security and tier 1 RRTA tax withheld (but not more than $7,049.40 for each employer). Social security tax should be shown in box 4 and tier 1 RRTA should be shown
in box 14 of your Forms W-2. Enter the total here
1.
2.Enter any uncollected social security and tier 1 RRTA tax on tips or group-term life insurance on Form 1040, line 60, identified by "UT" 2.
3.Add lines 1 and 2. If $7,049.40 or less, stop here. You cannot claim the credit 3.
4.Social security and tier 1 RRTA tax limit4.$7,049.40 
5.Excess. Subtract line 4 from line 35.
taxmap/pubs/p505-018.htm#en_us_publink1000194803
Pencil

Worksheet 3-3.Excess Tier 2 RRTA—Railroad Employees

1.Add all tier 2 RRTA tax withheld (but not more than $3,709.20 for each employer). Box 14 of your Forms W-2 should show tier 2 RRTA tax. Enter the total here 1.
2.Enter any uncollected tier 2 RRTA tax on tips or group-term life insurance on Form 1040, line 60, identified by "UT"2.
3.Add lines 1 and 2. If $3,709.20 or less, stop here. You cannot claim the credit. 3.
4.Tier 2 RRTA tax limit4.$3,709.20 
5.Excess. Subtract line 4 from line 3.5.