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

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

is properly addressed, contains sufficient postage, and is

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

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

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

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

considered filed on the last day in February of the succeeding

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

year if filed before that date.

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

Example. You filed your 2009 Form CT-1 on January 28,

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

2010, and payments were timely made. The IRS treats the

private delivery services.

return as if it were filed on February 28, 2010. On January 18,

2013, you discover that you overreported RRTA compensation

Underreported tax. If you are correcting underreported tax,

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

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

CT-1 X by February 28, 2013, which is the end of the period of

return period in which you discovered the error and pay the

limitations, and use the claim process.

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

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

generally will ensure that your correction is interest free and not

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

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

November 30, 2012, in the example above), you must

What About Penalties and Interest? on page 3.

CAUTION

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

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

If you also are correcting underreported amounts, you must file

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

another Form CT-1 X to correct the underreported amounts

must attach Form 945-A to Form CT-1 X. Otherwise, the IRS

using the adjustment process and pay any tax due.

may assess an “averaged” failure-to-deposit penalty. The total

tax reported on line M of Form 945-A must match the corrected

Where Should You File Form CT-1 X?

total tax (line 13 of Form CT-1 combined 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? on page 3. For details on

how to make a payment, see the instructions for line 18 on

How Should You Complete Form

page 8.

CT-1 X?

Example — You owe tax. On March 11, 2012, you discover

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

2010 Form CT-1. File Form CT-1 X and pay the amount you

Use One Form CT-1 X for Each Year You Are

owe by February 28, 2013, because you discovered the error in

Correcting

2012, and February 28, 2013, is the due date for that year. If

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

you file Form CT-1 X before February 28, 2013, pay the amount

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

you owe when you file.

CT-1 for 2009 and 2010, file one Form CT-1 X to correct the

Overreported tax — credit. If you overreported tax on Form

2009 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

2010 Form CT-1.

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

EIN, Name, and Address

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

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? below.

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 2010 Form CT-1 on February 25, 2011, and

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

payments were timely made. On May 3, 2011, you discover that

IRS will update your address of record.

you overreported tax on your 2010 Form CT-1. You file Form

Return You Are Correcting

CT-1 X on June 1, 2011. The IRS treats your credit as a tax

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

deposit made on January 1, 2011. When you file your 2011

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

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

and on any attachments.

the “Total railroad retirement tax deposits” line of your 2011

Form CT-1.

Enter the Date You Discovered Errors

Overreported tax — claim. If you overreported tax on Form

You must enter the date you discovered errors. If you are

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

reporting several errors that you discovered at different times,

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

enter the earliest date you discovered them here. You discover

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

an error when you have enough information to be able to

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

correct it. Report any subsequent dates and related errors on

reporting only corrections to the underreported amounts. See Is

line 21.

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

Must You Make an Entry on Each Line?

If you discovered an error on or before December 31,

You must provide all of the information requested at the top of

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

TIP

page 1 of Form CT-1 X. You must check one box (but not both)

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

in Part 1. You must check the box on line 3 and any boxes that

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

apply on lines 4 and 5. In Part 3, if any line does not apply,

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

leave it blank. Complete Parts 4 and 5 as instructed.

Is There a Deadline for Filing Form

How Should You Report Negative Amounts?

CT-1 X?

Form CT-1 X uses negative numbers to show reductions in tax

(credits) and positive numbers to show additional tax (amounts

you owe).

Generally, you may correct overreported taxes on a previously

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

When reporting a negative amount in columns 3 and 4, use

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

a minus sign instead of parentheses. For example, enter

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

“-10.59” instead of “(10.59).” However, if you are completing the

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

return on your computer and your software only allows you to

-2-

Instructions for Form CT-1 X (2011)

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

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