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reported in Part II of Form CT-1 or on Form 945-A, see the

If you discovered an error on or before December 31,

instructions for Form 945-A.

2008, but did not report it as a line adjustment on Form

TIP

CT-1 for any year that ended before 2009 and did not

Due dates. The due date for filing Form CT-1 X depends on

file a claim (Form 843), use Form CT-1 X to correct the error.

when you discover an error and if you underreported or

File Form CT-1 X for the year in which you made the error.

overreported tax. If you underreported tax, see Underreported

tax, later. For overreported amounts, you may choose to either

Is There a Deadline for Filing Form

make an interest-free adjustment or file a claim for refund or

CT-1 X?

abatement. If you are correcting overreported amounts, see

Overreported tax — credit or Overreported tax — claim, later.

Generally, you may correct overreported taxes on a previously

If any due date falls on a Saturday, Sunday, or legal holiday,

filed Form CT-1 if you file Form CT-1 X within 3 years of the

you may file Form CT-1 X on the next business day. If we

date Form CT-1 was filed or 2 years from the date you paid the

receive Form CT-1 X after the due date, we will treat Form

tax reported on Form CT-1, whichever is later. You may correct

CT-1 X as filed on time if the envelope containing Form CT-1 X

underreported taxes on a previously filed Form CT-1 if you file

is properly addressed, contains sufficient postage, and is

Form CT-1 X within 3 years of the date the Form CT-1 was

postmarked by the U.S. Postal Service on or before the due

filed. We call each of these time frames a “period of limitations.”

date, or sent by an IRS-designated private delivery service on

For purposes of the period of limitations, Form CT-1 is

or before the due date. If you do not follow these guidelines, we

considered filed on the last day in February of the succeeding

will consider Form CT-1 X filed when it is actually received. See

year if filed before that date.

Pub. 15 (Circular E) for more information on IRS-designated

Example. You filed your 2010 Form CT-1 on January 28,

private delivery services.

2011, and payments were timely made. The IRS treats the

return as if it were filed on February 28, 2011. On January 14,

Underreported tax. If you are correcting underreported tax,

2014, you discover that you overreported RRTA compensation

you must file Form CT-1 X by the due date of the return for the

on that form by $10,000. To correct the error you must file Form

return period in which you discovered the error and pay the

CT-1 X by February 28, 2014, which is the end of the period of

amount you owe when you file. Filing and paying on time

limitations, and use the claim process.

generally will ensure that your correction is interest free and not

subject to failure-to-pay or failure-to-deposit penalties. See

If you file Form CT-1 X to correct overreported amounts

What About Penalties and Interest?, later.

in the last 90 days of a period of limitations (after

November 30, 2013, in the example above), you must

CAUTION

If Form CT-1 X is filed late (after the due date of the return

use the claim process. You cannot use the adjustment process.

for the return period in which you discovered the error), you

If you also are correcting underreported amounts, you must file

must attach an amended Form 945-A to Form CT-1 X.

another Form CT-1 X to correct the underreported amounts

Otherwise, the IRS may assess an “averaged” failure-to-deposit

using the adjustment process and pay any tax due.

penalty. The total tax reported on line M of Form 945-A must

match the corrected total tax (line 13 of Form CT-1 combined

Where Should You File Form CT-1 X?

with any correction reported on line 18 of Form CT-1 X) for the

calendar year.

Send your completed Form CT-1 X to:

Pay the amount you owe when you file. Doing so will

Department of the Treasury

generally ensure that your correction is interest free and not

Internal Revenue Service Center

subject to failure-to-pay or failure-to-deposit penalties. See

Cincinnati, OH 45999-0007

What About Penalties and Interest?, later. For details on how to

make a payment, see the instructions for line 18, later.

How Should You Complete Form

Example — You owe tax. On March 11, 2013, you discover

CT-1 X?

that you underreported $1,000 of RRTA compensation on your

2011 Form CT-1. File Form CT-1 X and pay the amount you

Use a Separate Form CT-1 X for Each Year You

owe by February 28, 2014, because you discovered the error in

2013, and February 28, 2014, is the due date for that year. If

Are Correcting

you file Form CT-1 X before February 28, 2014, pay the amount

Use a separate Form CT-1 X for each Form CT-1 that you are

you owe when you file.

correcting. For example, if you found errors on your Forms

CT-1 for 2010 and 2011, file one Form CT-1 X to correct the

Overreported tax — credit. If you overreported tax on Form

2010 Form CT-1. File a second Form CT-1 X to correct the

CT-1 and choose to apply the credit to Form CT-1, file Form

2011 Form CT-1.

CT-1 X as soon as possible after you discover the error but

more than 90 days before the period of limitations on the credit

EIN, Name, and Address

or refund for Form CT-1 expires. See Is There a Deadline for

Enter your EIN, name, and address in the spaces provided.

Filing Form CT-1 X?, later.

Also enter your name and EIN on the top of pages 2 and 3, and

Example — You want your credit applied to Form CT-1.

on any attachments. If your address has changed since you

You filed your 2011 Form CT-1 on February 24, 2012, and

filed your Form CT-1, enter the corrected information and the

payments were timely made. On May 3, 2012, you discover that

IRS will update your address of record. Be sure to write your

you overreported tax on your 2011 Form CT-1. You file Form

name, EIN, “Form CT-1 X,” and calendar year on the top of any

CT-1 X on June 1, 2012. The IRS treats your credit as a tax

attachments.

deposit made on January 1, 2012. When you file your 2012

Return You Are Correcting

Form CT-1, include the amount from line 18 of Form CT-1 X on

Enter the calendar year of the Form CT-1 you are correcting at

the “Total railroad retirement tax deposits” line of your 2012

the top of page 1. Enter the calendar year on pages 2 and 3

Form CT-1.

and on any attachments. Be sure to write your name, EIN,

Overreported tax — claim. If you overreported tax on Form

“Form CT-1 X,” and calendar year on the top of any

CT-1, you may choose to file a claim for refund or abatement on

attachments.

Form CT-1 X any time before the period of limitations on credit

Enter the Date You Discovered Errors

or refund expires on Form CT-1. If you need to correct any

underreported amounts, you must file another Form CT-1 X

You must enter the date you discovered errors. You discover

reporting only corrections to the underreported amounts. See Is

an error when you have enough information to be able to

There a Deadline for Filing Form CT-1 X?, later.

correct it. If you are reporting several errors that you discovered

-2-

Instructions for Form CT-1 X (2012)

Instructions For Form Ct-1 X - Adjusted Employer'S Annual Railroad Retirement Tax Return Or Claim For Refund Page 3

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