Check the box on line 1 if you are correcting underreported amounts or overreported amounts and you would like to use the adjustment process to correct the errors.

If you are correcting both underreported amounts and overreported amounts on this form, you must check this box. If you check this box, any negative amount shown on line 17 will be applied as a credit (tax deposit) to your Form CT-1 for the year in which you are filing this form. See Example—You want your overreported tax applied as a credit to Form CT-1 above.

Check the box on line 2 to use the claim process if you are correcting overreported amounts only and you are claiming a refund or abatement for the negative amount (credit) shown on line 17. Do not check this box if you are correcting ANY underreported amounts on this form.

You must check the box on line 2 if you have a credit and the period of limitations on credit or refund for Form CT-1 will expire within 90 days of the date you file Form CT-1 X. See Is There a Deadline for Filing Form CT-1 X? on page 2.

The IRS usually processes claims shortly after they are filed. The IRS will notify you if your claim is denied, accepted as filed, or selected to be examined. See Publication 556, Examination of Returns, Appeal Rights, and Claims for Refund, for more information.

Unless the IRS corrects Form CT-1 X during processing or you owe other taxes, penalties, or interest, the IRS will refund the amount shown on line 17, plus any interest that applies.

Check the box on line 3 to certify that you filed or will file Forms W-2 or Forms W-2c, as required, showing your employees' correct wage and tax amounts. See the Instructions for Forms W-2 and W-3 and the Instructions for Forms W-2c and W-3c for detailed information about filing requirements.

You must check the box on line 3 to certify that you filed Forms W-2 or Forms W-2c even if your corrections on Form CT-1 X do not change amounts shown on those forms. For example, if your only correction to Form CT-1 involves misstated tax adjustments (see the instructions for line 16), check the box on line 3 to certify that you already filed all required Forms W-2 and W-2c.

If you overreported RRTA tax and checked the box on line 1, check the appropriate box on line 4. You may need to check more than one box. If you obtained written statements from some employees but you could not locate or secure the cooperation of the remaining employees, check all applicable boxes. Provide a summary in line 20 of the amount of the corrections for both the employees who provided written statements and for those who did not.

If you are filing a claim for refund or abatement of overreported RRTA tax and checked the box on line 2, check the appropriate box on line 5. You may need to check more than one box. If you obtained written statements or consents from some employees but you could not locate or secure the cooperation of the remaining employees, check all applicable boxes. Provide a summary in line 20 of the amount of the corrections for both the employees who provided statements or consents and for those who did not.

In certain situations, you may not have repaid or reimbursed your employees or obtained their consents prior to filing a claim, such as in cases where the period of limitations on credit or refund is about to expire. In those situations, file Form CT-1 X, but do not check a box on line 5. Tell us on line 20 that you “have not repaid or reimbursed employees or obtained consents.” However, you must certify that you have repaid or reimbursed your employees or obtained consents before the IRS can grant the claim.

In columns 1 and 2 of lines 6 through 16, show amounts for all of your employees, not just for those employees whose amounts you are correcting.

If a correction that you report in column 4 includes both underreported and overreported amounts (see the instructions for line 18), give us details for each error on line 20.

If you previously adjusted or amended Form CT-1 using an attached statement, Form 843, an “amended” Form CT-1, by filing a “supplemental” Form CT-1, or because of an IRS examination change, show amounts in column 2 that include those previously reported corrections.

If you are correcting the compensation (other than tips and sick pay) for the Tier I Employer tax you reported on line 1 of Form CT-1, enter the total corrected amount in column 1. In column 2, enter the amount you originally reported. In column 3, enter the difference between columns 1 and 2.

Multiply the amount in column 3 by .062 (6.2% tax rate) and enter the result in column 4.

If you are correcting compensation (other than tips and sick pay) for the Tier I Employer Medicare tax you reported on line 2 of Form CT-1, enter the total corrected amount in column 1. In column 2, enter the amount you originally reported or as previously corrected. In column 3, enter the difference between columns 1 and 2.

Multiply the amount in column 3 by .0145 (1.45% tax rate) and enter that result in column 4.

If you are correcting compensation (other than tips) for the Tier II Employer tax you reported on line 3 of Form CT-1, enter the total corrected amount in column 1. In column 2, enter the amount you originally reported or as previously corrected. In column 3, enter the difference between columns 1 and 2.

Multiply the amount in column 3 by the rate that applies to the year you are correcting and enter that result in column 4. If the amount in column 3 used a minus sign, also use a minus sign in column 4.

If you are correcting compensation, including tips reported, for the Tier I Employee tax you reported on line 4 of Form CT-1, enter the total corrected amount in column 1. In column 2, enter the amount you originally reported or as previously corrected. In column 3, enter the difference between columns 1 and 2.

Multiply the amount in column 3 by .062 (6.2% tax rate) and report that result in column 4.

Be sure to explain the reasons for this correction on line 20.

If you are correcting compensation, including tips reported, for the Tier I Employee Medicare tax you reported on line 5 of Form CT-1, enter the total corrected amount in column 1. In column 2, enter the amount you originally reported or as previously corrected. In column 3, enter the difference between columns 1 and 2.

Multiply the amount in column 3 by .0145 (1.45% tax rate) and enter that result in column 4.

Be sure to explain the reasons for this correction on line 20.

If you are correcting compensation, including tips reported, for the Tier II Employee tax you reported on line 6 of Form CT-1, enter the total corrected amount in column 1. In column 2, enter the amount you originally reported or as previously corrected. In column 3, enter the difference between columns 1 and 2.

Multiply the amount in column 3 by the rate that applies to the year you are correcting and enter that result in column 4. If the amount in column 3 used a minus sign, also use a minus sign in column 4.

If you are correcting sick pay for Tier I Employer tax you reported on line 7 of Form CT-1, enter the total corrected amount in column 1. In column 2, enter the amount you originally reported or as previously corrected. In column 3, enter the difference between columns 1 and 2.

Multiply the amount in column 3 by .062 (6.2% tax rate) and enter that result in column 4.

If you are correcting sick pay for Tier I Employer Medicare tax you reported on line 8 of Form CT-1, enter the total corrected amount in column 1. In column 2, enter the amount you originally reported or as previously corrected. In column 3, enter the difference between columns 1 and 2.

Multiply the amount in column 3 by .0145 (1.45% tax rate) and enter that result in column 4.

Be sure to explain the reasons for this correction on line 20.

If you are correcting sick pay for Tier I Employee tax you reported on line 9 of Form CT-1, enter the total corrected amount in column 1. In column 2, enter the amount you originally reported or as previously corrected. In column 3, enter the difference between columns 1 and 2.

Multiply the amount in column 3 by .062 (6.2% tax rate) and enter that result in column 4.

Be sure to explain the reasons for this correction on line 20.

If you are correcting sick pay for Tier I Employee Medicare tax you reported on line 10 of Form CT-1, enter the total corrected amount in column 1. In column 2, enter the amount you originally reported or as previously corrected. In column 3, enter the difference between columns 1 and 2.

Multiply the amount in column 3 by .0145 (1.45% tax rate) and enter that result in column 4.

Be sure to explain the reasons for this correction on line 20.

Do not enter an amount on line 16 unless you need to correct any current year adjustments reported on line 12 of a previously filed Form CT-1. See Example—Current year's sick pay underreported on page 7.

Enter the corrected amount for tax adjustments in column 1. Enter the originally reported or previously corrected current year amount from line 12 of Form CT-1 in column 2. In column 3, enter the difference between columns 1 and 2.

You may need to report negative numbers in any column. Make sure that the difference you enter in column 3 accurately represents the change to adjustments originally reported or previously corrected on line 12 of Form CT-1.

Copy the amount in column 3 to column 4. Include any minus sign shown in column 3.

On line 20, describe what you misreported on Form CT-1. Tell us which current year adjustments have changed, that is, fractions of cents, sick pay, or credits for overpayments of penalty or interest paid on tax for earlier years.

Only use line 16 to correct adjustments for fractions of cents, sick pay, or credits for overpayments of penalty or interest previously reported. File a separate Form
CT-1 X for each year being corrected.

Combine the amounts on lines 6 through 16 of column 4.

Check the box on line 18 if any corrections you entered on lines 6 through 16 in column 3 reflect both underreported and overreported amounts.

Check the box on line 19 if you reclassified any workers to be independent contractors or nonemployees. Also check this box if the IRS (or you) determined that workers you treated as independent contractors or nonemployees should be classified as employees. On line 20, give us a detailed reason why any worker was reclassified.

Treasury regulations require you to explain in detail the grounds and facts relied upon to support each correction. On line 20, describe in detail each correction you entered in column 4 on lines 6 through 16. If you need more space, attach additional sheets, but be sure to write your name, EIN, and calendar year on the top of each sheet.

You must describe the events that caused the underreported or overreported amounts. Explanations such as “RRTA compensation was overstated” or “administrative/payroll errors were discovered” are insufficient and may delay processing your Form CT-1 X because the IRS may need to ask for a more complete explanation.

The following is the information we need in your explanation for each error you are correcting.

You may report the information in paragraph form. The following paragraph is an example.

“The $1,000 difference shown in column 3 of lines 6 and 7 was discovered on May 15, 2009, during an internal payroll audit. We discovered that we included $1,000 of compensation for one of our employees twice. This correction removes the reported compensation that was never paid.”

You must complete this section if you were paid to prepare Form CT-1 X and are not an employee of the filing entity. Sign in the space provided. Give the employer the return to file with the IRS and include a copy of the return for the employer's records. Paid preparers must sign Form CT-1 X with a manual signature.

If you are a paid preparer, write your SSN or your Preparer Tax Identification Number (PTIN) in the space provided. Include your complete address. If you work for a firm, write the firm's name and the EIN of the firm. You can apply for a PTIN using Form W-7P, Application for Preparer Tax Identification Number. You cannot use your PTIN in place of the EIN of the tax preparation firm.

Generally, you are not required to complete this section if you are filing the return as a reporting agent and have a valid Form 8655, Reporting Agent Authorization, on file with the IRS. However, a reporting agent must complete this section if the reporting agent offered legal advice, for example, advising the client on determining whether its workers are employees or independent contractors for federal tax purposes.