! amounts of Tier 1 Employee Additional Medicare
0425 Inst CT-1X (PDF) · 2026-10-03 edition · updated 2026-10-04 · United States
CAUTION Tax unless the amounts weren’t withheld from
employee compensation.
If you owe tax. Pay the amount shown on line 26 by the time you file Form CT-1 X. Generally, you won’t be charged interest if you file on time, pay on time, enter the date you discovered the error, and explain the correction on line 43.
If you have a credit. You overreported RRTA taxes (you have a negative amount on line 26) and want the IRS to apply the credit to Form CT-1 for the period during which you filed Form CT-1 X. The IRS will apply your credit on the first day of the Form CT-1 year during which you filed Form CT-1 X. However, the credit you show on Form CT-1 X, line 26, may not be fully available on your Form CT-1 if the IRS corrects it during processing or you owe other taxes, penalties, or interest. The IRS will notify you if your claimed credit changes or if the amount available as a credit on Form CT-1 was reduced because of unpaid taxes, penalties, or interest.
Don’t check the box on line 1 if you’re correcting
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