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Reviewed by: William McLee
Reviewed date:
January 15, 2026

What the New York Form CT-3-ATT (2010) Is For

New York Form CT-3-ATT 2010 is a required attachment to Form CT-3 for corporations subject to New York’s General Business Corporation Franchise Tax. It reports investment capital, subsidiary capital, and specific utility-related adjustments that can affect how New York calculates franchise tax.

CT-3-ATT includes CT-3-ATT schedules that feed specific figures into Form CT-3, including allocated capital and related income. When one or more schedules apply, filing CT-3-ATT is part of filing a complete New York corporate return for the 2010 tax year.

When You’d Use New York Form CT-3-ATT (2010)

A corporation uses New York Form CT-3-ATT 2010 when it files Form CT-3 and it has investment capital, subsidiary capital, or qualifying utility transition property covered by the attachment schedules. The attachment is required whenever applicable and should be filed with the same return package.

The CT-3-ATT due date follows the Form CT-3 owing date for the same tax year. For calendar-year corporations, the deadline is generally March 15, 2011, and any approved extension applies to both forms filed together.

Key Rules or Details for 2010

Schedule Overview

Schedule B reports investment capital, which generally includes passive holdings of qualifying securities not held for operational business purposes. Schedule C reports subsidiary capital when the corporation owns more than 50 percent of another corporation’s voting stock, and it can also include certain intercompany receivables.

Schedule D is limited to qualified public utilities, power producers, and pipeline corporations with transition property placed in service before January 1, 2000. Investment and subsidiary capital are generally allocated to New York using issuer allocation percentages. Missing allocation information can result in penalties and follow-up.

Filing Requirements

CT-3-ATT must be attached to Form CT-3 when required, and it is not filed as a stand-alone form. Late filing rules and penalties generally align with the underlying CT-3 return requirements, and amended filings require updating the CT-3-ATT when corrected items change the schedules.

Step-by-Step (High Level)

Step 1: Schedule Eligibility

Start by confirming which CT-3-att schedules apply for 2010 based on the taxpayer’s holdings and activities. Review whether there is investment capital, more than 50 percent subsidiary ownership, or a qualifying utility transition property.

Step 2: Required Records

Gather the documentation needed to support CT-3-ATT, including investment statements, subsidiary ownership records, intercompany balances, and issuer allocation percentages. Maintain records that support both valuation and classification, as these items are frequently reviewed and audited.

Step 3: Average Value Calculations

Compute average values using the beginning-of-year and end-of-year amounts for each applicable holding. If assets were acquired or disposed of during the year, prorate the values to avoid overstating the capital base.

Step 4: Liability Attribution

Reduce reported capital by attributing liabilities to applicable holdings, including direct debt tied to specific investments and indirect liabilities allocated under the instructions. This step helps prevent overstating net investment capital or net subsidiary capital on the schedules.

Step 5: New York Allocation and Transfer

Apply issuer allocation percentages to determine the portion of each holding allocated to New York State, then total the allocated amounts for the applicable schedules. Transfer the totals to the correct Form CT-3 lines and file the attachment by the due date.

Common Mistakes and How to Avoid Them

  • Misclassifying capital as investment capital when it is used in active operations: Classify each asset based on statutory definitions and documented business use rather than labeling assets as investment capital by default.

  • Failing to average beginning and ending balances: Use the required averaging method for balance-based amounts on the CT-3-ATT schedules instead of relying only on year-end figures.

  • Overlooking required reductions for related liabilities: Allocate both direct and indirect liabilities to the associated assets so taxable capital is not overstated.

  • Using missing or unsupported issuer allocation percentages: Obtain issuer-provided documentation and retain it in the workpapers, rather than estimating percentages or leaving required fields blank.

  • Completing Schedule D without meeting public utility requirements: Confirm eligibility tied to the 1999 regulatory and tax status rules before applying Schedule D adjustments.

What Happens After You File

New York processes the CT-3-ATT and Form CT-3 together, and the numbers reported are used to determine the franchise tax for the 2010 tax year. Returns that include investment or subsidiary capital may need to be re-examined because their schedules depend on issuer allocation data and records from other companies.

If the corporation discovers errors after filing, it should submit an amended CT-3 with a corrected CT-3-ATT when the changes affect the schedules. Failing to file on time or omitting attachments can result in notices, fines, and interest that accrue from the original due date.

FAQs

Is New York Form CT-3-ATT filed separately from Form CT-3?

No, CT-3-ATT must be attached to Form CT-3 and filed together as one complete return package.

Does every corporation filing Form CT-3 need to include CT-3-ATT?

No, the attachment is required only when the corporation has items that fall under the CT-3-ATT schedules for the 2010 tax year.

What ownership level triggers Schedule C reporting?

Schedule C applies when the corporation owns more than 50 percent of another corporation’s voting stock, and precisely 50 percent does not meet the threshold.

Are mutual funds treated as investment capital for 2010?

Mutual funds and similar pooled investment products are generally not treated as investment capital under New York rules, and they are commonly treated as business capital instead.

What happens if issuer allocation percentages are missing?

Missing issuer allocation information can result in penalties and increase the likelihood of follow-up requests, as accurate allocation is required to complete the schedules.

Can CT-3-ATT be filed late if Form CT-3 was filed on time?

A required attachment that is missing can cause the return to be treated as incomplete, which may result in notices and potential penalties.

Who qualifies to file Schedule D?

Schedule D generally applies only to corporations meeting specific public utility, power producer, or pipeline requirements tied to transition property placed in service before January 1, 2000.

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