Form CT-2 – Employee Representative's Quarterly Railroad Tax Return

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Form CT-2 is the Employee Representative's Quarterly Railroad Tax Return, filed by an individual employee representative to report and pay their own railroad retirement taxes. It computes railroad retirement taxes across Lines 1 through 6, including a Line 5 credit for an earlier quarter's overpayment. It is filed quarterly on paper, in ORIGINAL and DUPLICATE copies, to the IRS service center in Kansas City, and is unrelated to any state corporate or unemployment return. Below, you will get the what, the how, and the extra checks that keep your review cycle clean.

Key Takeaways

• Form CT-2 is the Employee Representative's Quarterly Railroad Tax Return; a railroad employer files Form CT-1, but an individual employee representative files CT-2 quarterly on their own compensation.
• For 2026, report Tier 1 (12.4% on the first $184,500) and Tier 2 (13.1% on the first $137,100) on capped compensation, Tier 1 Medicare (2.9%) on all compensation, and the 0.9% Additional Medicare Tax once compensation passes $200,000.
• Once you start filing CT-2 you must file every quarter, even a zero-compensation quarter, until compensation stops for good, when you mark both copies "Final Return."
• Tier 1 and Tier 2 are capped, but Tier 1 Medicare is not: stop Tier 1 at the $184,500 base and Tier 2 at the $137,100 base for 2026, while running the 2.9% Tier 1 Medicare tax on every dollar of compensation on Line 2.
• Quarterly returns are due May 31, August 31, November 30, and February 28, two months after each quarter closes, not on the Form 941 dates.

Purpose and scope of Form CT‑2

Think of CT-2 as the quarterly return an individual employee representative uses to report and pay railroad retirement taxes on the compensation they receive for representing employees. The form is always completed by hand and mailed; there is no electronic-filing option, and the employee representative (or an authorized agent) signs the ORIGINAL under penalties of perjury.

To complete CT-2, total the taxable compensation paid (or constructively paid) during the quarter, apply the tier rates on Lines 1 through 4, subtract any Line 5 credit on Line 6, sign the ORIGINAL, and mail both copies to the IRS. That sequence produces an accurate, auditable return.

Tip I give every reviewer: confirm the filer is an employee representative, not a railroad employer, before you start. A railroad employer reports its own railroad retirement taxes on Form CT-1; CT-2 is for the individual rep alone.

Who must file, and the conditions that matter

You must file CT-2 for the first quarter you are paid taxable compensation as an employee representative, and continue filing every quarter after that, even when no compensation is paid, until you file a Final Return. An employee representative is an individual (typically a union officer authorized under the Railway Labor Act), not a corporation, so combined-group and nexus rules do not apply.

Who qualifies as an employee representative

CT-2 is filed by an individual employee representative, not by C or S corporations; corporations do not file this form. The definition has three prongs you should confirm before opening the return: the labor organization is not itself an employer under section 3231(a), the representative was in the service of a covered employer, and the representative is authorized and designated to represent employees under the Railway Labor Act. An individual regularly assigned to or regularly employed by such a representative in connection with those duties can also qualify.

Question	Answer	Result
Filer is an individual rep	Yes	File CT-2 quarterly
Filer is a railroad employer	Yes	File CT-1, not CT-2
Compensation paid this quarter	None, but role continues	File a zero CT-2
Compensation stopped for good	Yes	File a Final Return on both copies

What counts as compensation

CT-2 is a substantive tax return that computes Tier 1, Tier 1 Medicare, Tier 1 Additional Medicare, and Tier 2 railroad retirement taxes; it is not a procedural form. Compensation means payment in money for services performed as an employee representative. It does not include amounts paid specifically for traveling or other bona fide and necessary expenses that meet the rules under section 62. Compensation is also counted when constructively paid, meaning it has been set apart or credited and is available for the representative to draw on and control.

Filing timelines you should actually care about

There are two clocks to watch. First, the quarterly calendar that controls when each CT-2 is due. Second, the running annual total of compensation, which controls when the Tier 1 and Tier 2 caps stop applying and when the $200,000 Additional Medicare trigger kicks in.

The quarterly calendar

CT-2 covers calendar quarters, and the return for each quarter is due two months after the quarter closes. For calendar year filers that puts the four deadlines on May 31, August 31, November 30, and February 28 of the following year. These do not match the Form 941 dates, which fall one month after each quarter. Plan your quarter close against the real CT-2 dates so the return is signed and mailed in time.

Quarterly periods and due dates

Form CT-2 is due quarterly on May 31, August 31, November 30, and February 28, two months after each quarter closes, not on the Form 941 dates (April 30, July 31, October 31, January 31). If a due date lands on a Saturday, Sunday, or legal holiday in the District of Columbia, you may file the return and pay the tax on the next business day. Use those dates to anchor your year‑to‑date tier checks before you file.

The exact steps to complete CT‑2

Most misses happen because one step in the sequence is out of order. Follow this, and you will save yourself a chase.

• Confirm the filer is an individual employee representative authorized under the Railway Labor Act.
• Enter the calendar quarter in spelled-out format, for example "Jan., Feb., Mar. 2026."
• Total the taxable compensation paid during the quarter and apply the tier rates on Lines 1 through 4: 12.4% Tier 1, 2.9% Tier 1 Medicare, 0.9% Additional Medicare, and 13.1% Tier 2.
• Subtract any Line 5 credit and report the total tax for the quarter on Line 6.
• Sign the ORIGINAL and prepare an identical DUPLICATE copy.
• Mail both the ORIGINAL and DUPLICATE to the IRS service center, Kansas City, MO 64999-0049, postmarked on or before the due date.

Micro‑anecdote: during a year‑end crunch, a reviewer kept applying the Tier 1 cap to the Medicare line as well, and the quarter's tax came in low. We separated Line 2 from the capped tiers, ran Medicare on full compensation, and the numbers reconciled. Thirty seconds, problem solved.

Tier 1 and Tier 2 compensation bases

The heart of an accurate CT-2 is knowing which dollars are capped and which are not. Tier 1 and Tier 2 each apply only up to an annual compensation base, while Tier 1 Medicare runs on every dollar of compensation. Update your worksheet each year, because the bases change.

• For 2026, the Tier 1 compensation base is $184,500.
• For 2026, the Tier 2 compensation base is $137,100.
• The Tier 1 Medicare tax has no compensation base limit.

Here is a quick summary you can save to your workpapers for the 2026 figures from the Instructions for Form CT-2, Rev. March 2026.

Line	Rate	Applies to
Line 1, Tier 1	12.4%	First $184,500 of 2026 compensation
Line 2, Tier 1 Medicare	2.9%	All compensation, no cap
Line 3, Additional Medicare	0.9%	Compensation above $200,000
Line 4, Tier 2	13.1%	First $137,100 of 2026 compensation

Apply the cap, then the rate

• Confirm the year's compensation bases, and make sure Lines 1 and 4 stop at the Tier 1 and Tier 2 caps respectively.
• Run Line 2 Tier 1 Medicare against full compensation with no cap, since the Medicare portion has no ceiling.
• For a dual-role filer who is both an employee representative and an employee, subtract employee pay from the applicable maximum before computing Lines 1 and 4.

Quarterly timing and payments

• Total taxable compensation for the quarter, including any compensation that is constructively paid.
• Apply the tier rates on Lines 1 through 4, subtract any Line 5 credit, and report total taxes on Line 6.
• Pay by the CT-2 due dates (May 31, August 31, November 30, February 28) and keep your confirmation in the close binder.

Required filer information that trips people up

Enter the employee representative's own name and social security number (SSN); CT-2 has no employer legal-name or state tax registration fields because it is filed by an individual, not an employer. There is no "number of employees or payrolls covered" field either, because the return reports the representative's own compensation, not a payroll.

• Verify identifiers, and match the representative's legal name and SSN before you file.
• Confirm the address is a deliverable location with full ZIP.
• Set a responsive contact who can answer tier and deadline questions on short notice.

Enter the calendar quarter (for example, "Jan., Feb., Mar. 2026") and the employee representative's own compensation. Only the ORIGINAL copy is signed under penalties of perjury, and you keep an identical DUPLICATE plus a third record copy. If you revise a tier figure or correct a base, recompute Line 6 before you finalize the return.

Computing the tax, a clean example

Say an employee representative is paid $50,000 of taxable compensation in a quarter, well under every annual cap. Line 1 applies 12.4% Tier 1 to the $50,000, Line 2 applies 2.9% Tier 1 Medicare to the same $50,000, and Line 4 applies 13.1% Tier 2 to the $50,000. Because year-to-date compensation has not crossed $200,000, Line 3 Additional Medicare Tax is zero this quarter. Add Lines 1 through 4, subtract any Line 5 credit, and report the total on Line 6. If a later quarter pushes year-to-date compensation past the Tier 1 or Tier 2 base, the capped tiers stop on the excess while Tier 1 Medicare keeps running on every dollar.

Adjustments, credits, and overpayments, and where they belong

CT-2 Line 5 allows a credit for an overpayment of tax, penalty, or interest from an earlier quarter, with two copies of a detailed explanation attached. Do not claim a prior-year Additional Medicare Tax overpayment on Line 5; recover that on Form 1040-X with the individual income tax return. Any Additional Medicare Tax paid through CT-2 is credited against the total tax liability shown on the filer's Form 1040 or Form 1040-SR, and is reconciled on Form 8959.

Practical guardrail: make a one‑page "what goes where" map in your binder. Keep current-quarter overpayments on Line 5 with the explanation attached, and route prior-year Additional Medicare Tax claims to Form 1040-X, not to CT-2.

How to file, electronic versus paper

CT-2 is always filed on paper; complete the ORIGINAL and DUPLICATE copies by hand and mail both to the IRS, since there is no e-file option for this form. That is by design. Mail both copies together to the Department of the Treasury, Internal Revenue Service Center, Kansas City, MO 64999-0049.

• The IRS recommends paying electronically through EFTPS or IRS Direct Pay where possible. New EFTPS enrollment for CT-2 filers closed after October 17, 2025, so filers not already enrolled should use IRS Direct Pay.
• If paying by check or money order, make it payable to "United States Treasury" and note the SSN, "Form CT-2," and the quarter, for example "1Q 2026."
• A return received after the due date is still timely if it is properly addressed, has sufficient postage, and is postmarked by the U.S. Postal Service on or before the due date, or sent by an IRS-designated private delivery service on or before the due date.

Keep one important distinction in mind. Form CT-2 is a federal railroad retirement tax return. It is not a Connecticut corporate filing, a New York return, or a substitute for any state return.

Recordkeeping and documentation

Treat the CT‑2 cycle like any other recurring control. Document the quarter filed, the compensation totals, the tier computations, and the payment method. Keep records relating to employee representative taxes for at least 4 years after the taxes are due or were paid, whichever is later, and retain the ORIGINAL, the DUPLICATE, and a third record copy. If your firm runs an internal audit, keep the worksheet that shows how each tier was capped and where Tier 1 Medicare ran uncapped.

When compensation stops for good, file a Final Return with "Final Return" written at the top of both copies, and note in your binder that the role has ended so a reviewer does not expect another quarterly return.

Common errors and how to avoid them

• Confusing CT-2 with Form CT-1: CT-1 is the railroad employer's annual return, while CT-2 is the individual employee representative's quarterly return. Confirm the filer's role first.
• Capping Tier 1 Medicare: the 2.9% Medicare tax on Line 2 has no compensation base, so it must keep running after the Tier 1 and Tier 2 caps stop.
• Stopping quarterly filing during a lull: once you start filing CT-2 you must file every quarter, even with zero compensation, until you file a Final Return.
• Borrowing the Form 941 calendar: CT-2 is due two months after each quarter, not one, so the deadlines are May 31, August 31, November 30, and February 28.

Quick win: add a three line check above the signature, Tier caps applied, Medicare uncapped, due date confirmed. That tiny guardrail saves hours in peak season.

Troubleshooting a CT‑2 that will not balance

If your CT-2 total on Line 6 does not match your expected liability, run this short diagnostic before you sign.

• Confirm the filer is an individual employee representative authorized under the Railway Labor Act; railroad employers file Form CT-1 instead.
• Recheck that Lines 1 and 4 stopped at the Tier 1 and Tier 2 bases for the year, and that Line 2 Tier 1 Medicare ran on full compensation with no cap.
• Verify the quarter is entered in spelled-out format (for example, "Jan., Feb., Mar. 2026") and that the ORIGINAL copy is signed under penalties of perjury.
• Confirm Line 3 Additional Medicare Tax started in the pay period where year-to-date compensation first exceeded $200,000.
• If a Line 5 credit is claimed, confirm two copies of the detailed explanation are attached and that no prior-year Additional Medicare Tax overpayment is included there.

Quarterly due dates, and why they matter

The CT-2 calendar is the single easiest thing to get wrong, because nothing else on a tax calendar looks like it. Lock these in so they are never confused with the one-month-earlier Form 941 dates.

• Q1 (Jan-Mar) due May 31
• Q2 (Apr-Jun) due August 31
• Q3 (Jul-Sep) due November 30
• Q4 (Oct-Dec) due February 28 of the following year. If a due date falls on a Saturday, Sunday, or legal holiday in the District of Columbia, you may file on the next business day.

2026 numbers to hard‑code into your templates

The tier rates are stable, but the annual compensation bases change. Lock in the 2026 figures from the Instructions for Form CT-2, Rev. March 2026: the Tier 1 compensation base is $184,500 and the Tier 2 compensation base is $137,100. Tier 1 Medicare has no base limit, and the Additional Medicare Tax threshold is a flat $200,000 per calendar year.

Save this snippet in your binder: "CT-2 2026 – Tier 1 12.4% on first $184,500, Tier 2 13.1% on first $137,100, Tier 1 Medicare 2.9% uncapped, Additional Medicare 0.9% above $200,000."

A short note on the Additional Medicare Tax

On CT-2 the 0.9% Additional Medicare Tax triggers at a flat $200,000 of compensation per calendar year, regardless of filing status, beginning in the pay period in which compensation crosses that line. The filing-status thresholds you may know from Form 8959 belong on the individual income tax return, not on this quarterly return. Any Additional Medicare Tax paid through CT-2 is reconciled later on Form 8959 filed with the Form 1040, which is mandatory if any Additional Medicare Tax is paid during the year.

Where Accountably fits, if you are scaling delivery

If you have ever watched a CT-2 slip a quarter because nobody owned the calendar, you already know this is not a staffing problem, it is a delivery system problem. When we build disciplined offshore delivery for firms, we fold low-volume, unforgiving returns like CT-2 into SOPs, with structured workpapers, multi‑layer review, and clear SLAs. That way, reviewers touch fewer returns twice, and quarter close stays predictable. If you run QuickBooks, Xero, UltraTax, CCH Axcess, ProConnect, Lacerte, Drake, Karbon, Canopy, TaxDome, Suralink, or JetPack, your team can work inside your system, your templates, and your client expectations from day one, with documented tier math and a Final-Return trigger baked in.

Conclusion

You now have a clear path to handle Form CT‑2 without the last minute scramble. Total the quarter's taxable compensation, apply the tier rates on Lines 1 through 4, net any Line 5 credit on Line 6, sign the ORIGINAL, and mail both copies to Kansas City by the due date. Cap Tier 1 and Tier 2 at the year's bases, keep Tier 1 Medicare running on every dollar, and watch the $200,000 Additional Medicare trigger so Line 3 starts in the right quarter. When you need a steady hand on delivery, bring the same discipline to your broader workflow that you just applied to CT‑2.

Key numbers to lock in for 2026: the Tier 1 base is $184,500, the Tier 2 base is $137,100, Tier 1 Medicare is uncapped, and the four due dates are May 31, August 31, November 30, and February 28. Update your templates now, add a short pre-signature checklist, and you will feel the relief of a smooth quarter close when the next rush hits.

Common Mistakes We See Every Season

A few CT-2 errors come back every quarter, and most trace to treating this return like a payroll form it is not. Here are the ones my team flags most.

Reusable Checklists

These are copy-paste ready for your SOP library. Drop them into your engagement templates and check items off as you close each quarter.

Keep CT2 Season From Stalling

Form CT-2 is low-volume but unforgiving. The same filer reports four times a year on fixed deadlines (May 31, August 31, November 30, and February 28, per the Instructions for Form CT-2, Rev. March 2026), and one missed quarter or a dropped Final Return puts the employee representative on the non-filer roster with late-filing and late-payment penalties accruing separately, plus interest on top.

The work is not hard, but it is easy to lose between quarters because nothing else on a payroll calendar looks like it. The fix is the same discipline we apply to any recurring compliance task: a standing checklist, a calendar that does not borrow the Form 941 dates, and a reviewer who confirms the tier math before the return goes out.

• Lock the four CT-2 deadlines in a recurring calendar so they are never confused with the one-month-earlier Form 941 schedule.
• Keep a tier worksheet that applies the $184,500 Tier 1 cap and $137,100 Tier 2 cap for 2026 while leaving Tier 1 Medicare uncapped on Line 2.
• Track the $200,000 Additional Medicare trigger across the year so Line 3 starts in the correct quarter and Form 8959 is queued for the individual return.
• Maintain a Final-Return trigger so a closed role is marked on both copies rather than silently abandoned.
• Store both filed copies plus a third record copy for the full 4-year retention window.

This is the kind of recurring, detail-heavy filing that quietly eats senior review time. Accountably’s tax execution teams run returns like this inside documented SOPs with multi-layer review, so the quarterly cycle closes on time without pulling a partner into tier math every three months.

FAQs

What is Form CT‑2

Form CT-2 is the Employee Representative's Quarterly Railroad Tax Return, filed by an individual employee representative to report and pay their own Tier 1, Tier 1 Medicare, Tier 1 Additional Medicare, and Tier 2 railroad retirement taxes. You file it quarterly for as long as you are paid taxable compensation as an employee representative, mailing the ORIGINAL and DUPLICATE copies to the IRS. It does calculate tax: Lines 1 through 4 compute the four taxes, Line 5 is a credit, and Line 6 totals the quarter's taxes.

How is Form CT‑2 different from Form CT‑1

Form CT-1 is the railroad employer's annual return. Form CT-2 is filed quarterly by the individual employee representative on their own compensation. Confirm the filer's role before you choose the form: railroad employers file CT-1, and employee representatives file CT-2.

What are the Tier 1 and Tier 2 rates and bases on Form CT‑2

For compensation paid during 2026, Tier 1 is 12.4% on the first $184,500, Tier 1 Medicare is 2.9% on all compensation with no cap, an extra 0.9% Additional Medicare Tax applies to compensation above $200,000, and Tier 2 is 13.1% on the first $137,100. Confirm the current year's bases before you finalize the quarter.

When is Form CT‑2 due

Form CT-2 is due quarterly on May 31, August 31, November 30, and February 28, two months after each quarter closes, not on the Form 941 dates (April 30, July 31, October 31, January 31). If a due date falls on a Saturday, Sunday, or legal holiday, you may file on the next business day.

Does Form CT‑2 replace a state return

No. Form CT-2 is a federal return for railroad retirement taxes on an employee representative's own compensation. It is not a Connecticut or New York filing and does not replace any state corporate or unemployment return.

How do I pay and file Form CT‑2

Pay electronically via EFTPS or IRS Direct Pay where possible; new EFTPS enrollment for CT-2 filers closed after October 17, 2025. If paying by check, make it payable to "United States Treasury" and note the SSN, "Form CT-2," and the quarter. Complete the ORIGINAL and DUPLICATE copies by hand, sign the ORIGINAL, and mail both to the IRS service center in Kansas City, MO 64999-0049.

Do I have to keep filing in a quarter with no compensation

Yes. Once you start filing CT-2 you must file every quarter, even a zero-compensation quarter, until compensation stops for good. When it stops, write "Final Return" at the top of both the ORIGINAL and DUPLICATE copies.