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South Carolina S Corporation Income Tax Return

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STATE OF SOUTH CAROLINA S CORPORATION INCOME TAX RETURN (SC 1120S)

Part I - General Information

SC file #

Income tax period ending

License fee period ending

FEIN

Name

Mailing address

City State ZIP

Change of

Total gross receipts

Total cost of depreciable personal property in SC

Number of nonresident shareholders

Number of nonresident shareholders included in a composite return

Number of nonresident shareholders with an I-309 affidavit

County or counties in SC where property is located

Audit contact Phone number

Audit location: Street address

City State ZIP

Does the corporation have any shareholders who are nonresidents of South Carolina?

Computation of Income Tax Liability

1. Total of line 1 through 10, Schedule K of the federal 1120S

2. Net adjustment from Schedule A and B, line 15

3. Total net income as reconciled (add line 1 and line 2)

4. If multi-state corporation, enter amount from Schedule G, line 6; otherwise, enter amount from line 3

5. Active Trade or Business Income (from I-435, line 22)

6. Active Trade or Business Tax (from I-435, line 25)

7. Income taxed to shareholders

8. South Carolina net taxable income (subtract line 5 and line 7 from line 4)

9. Tax (multiply line 8 by 5%)

10. Total Income Tax (add line 6 and line 9)

11. Nonrefundable credits (enter amount from SC1120TC)

12. Balance of tax (subtract line 11 from line 10)

13. Payments: (a) Tax withheld (b) Paid by declaration (c) Paid with extension (d) Credit from line 28b

Refundable Credits: (e) Ammonia Additive (f) Milk Credit (g) Motor Fuel Income Tax Credit

14. Total payments and refundable credits (add line 13a through line 13g)

15. Balance of tax (subtract line 14 from line 12)

16. (a) Interest (b) Late file/pay penalty (c) Declaration penalty (attach SC2220)

16. Total (add line 16a through line 16c)

17. Total Income Tax, interest, and penalty (add line 15 and line 16)

18. Overpayment (subtract line 12 from line 14)

To be applied as follows: (a) Estimated Tax (b) License Fee (c) REFUND

Part II - Computation of License Fee

19. Total capital and paid in surplus (multi-state corporations see Schedule E)

20. License Fee: multiply line 19 by .001, then add $15 (Fee cannot be less than $25)

21. Credits taken this year against License Fee from SC1120TC, Part II, Column C

22. Balance (subtract line 21 from line 20)

23. Payments: (a) Paid with extension (b) Credit from line 18b

24. Total payments (add line 23a and line 23b)

25. Balance of License Fee (subtract line 24 from line 22)

26. (a) Interest (b) Late file/pay penalty

26. Total (add line 26a and line 26b)

27. Total License Fee, interest, and penalty (add line 25 and line 26)

28. Overpayment (subtract line 22 from line 24)

To be applied as follows: (a) Estimated Tax (b) Income Tax (c) REFUND

29. GRAND TOTAL: INCOME TAX and LICENSE FEE DUE (add line 17 and line 27)

Refund Options

If you select Direct Deposit, choose the account type (US accounts only)

Routing Number (RTN) Bank Account Number (BAN)

Schedule A and B - Additions to Federal Taxable Income

1. Taxes on or measured by income

2. Excess net passive income subject to federal tax

3. Taxable portion of certain built-in gains subject to federal tax

6. Other additions (attach schedule)

7. Total additions (add line 1 through line 6)

Deductions From Federal Taxable Income

8.

9.

10.

11.

12.

13. Other deductions (attach schedule)

14. Total deductions (add line 8 through line 13)

15. Net adjustment (subtract line 14 from line 7)

Schedule C - Reserved

Schedule D - Annual Report To Be Completed By All Corporations

1. Name

2. Incorporated under the laws of the state of

3. Location of the registered office of the corporation in South Carolina

In the city of Registered agent at this address

4. Principal office address

Nature of principal business in South Carolina

5. Total number of authorized shares of capital stock

Class Series

6. Total number of issued and outstanding shares of capital stock

Class Series

7. Names and business addresses of the directors and principal officers

8. Date incorporated Date commenced business in South Carolina

9. Date of this report FEIN

10. If foreign corporation, the date qualified to do business in South Carolina

11. Was the name of the corporation changed during the year? Previous name

12. The corporation's books are in the care of

Located at (street address)

13. The total amount of stated capital per balance sheet:

A. Total paid in capital stock

B. Total paid in capital surplus

C. Total amount of stated capital

Schedule E - Computation of License Fee of Multi-State Corporations

1. Total capital and paid in surplus at end of year

2. SC proportion

Schedule F - Income Subject to Direct Allocation

Allocated income entries

Schedule G - Computation of Taxable Income of Multi-State Corporations

1. Total net income as reconciled from SC1120S, page 1, line 3

2. Income subject to direct allocation to SC and other states from Schedule F, line 1

3. Total net income subject to apportionment (subtract line 2 from line 1)

4. Multiply line 3 by appropriate ratio from Schedule H-1, H-2, or H-3

5. Income subject to direct allocation to SC from Schedule F, line 2

6. Total SC net income (add line 4 and line 5)

Schedule H-1 - Computation of Sales Ratio

1. Total sales within South Carolina Ratio

2. Total sales everywhere Ratio

3. Sales ratio

Schedule H-2 - Computation of Gross Receipts Ratio

1. South Carolina gross receipts

2. Amounts allocated to South Carolina on Schedule F

3. South Carolina adjusted gross receipts

4. Total gross receipts

5. Total amounts allocated on Schedule F

6. Total adjusted gross receipts

7. Gross receipts ratio

Schedule H-3 - Computation of Ratio for Section 12-6-2310 Companies

1. Total within South Carolina

2. Total everywhere

3. Taxable ratio

Schedule K Worksheet

Nonrefundable Tax Credits: Enter total credits from SC1120TC

You must attach your SC1120TC to this return.

Ordinary business income (loss)

Dividends

Net rental real estate income (loss)

Other net rental income (loss)

Interest income

Royalties

Net short-term capital gain (loss)

Net long-term capital gain (loss)

Net section 1231 gain (loss)

Other income (loss)

Section 179 deduction

Contributions

Investment interest expense

Section 59(e)(2) expenditures

Other deductions

Schedule L - QSSSs and Disregarded LLCs Included in Return

QSSS name FEIN SC file #

Disregarded LLC name FEIN SC file #

Schedule N - Property Information

Property within South Carolina - Beginning Period / Ending Period

Land

Buildings

Machinery and equipment

Construction in progress

Other property

Total

Description of property from line 5 above

Signature Section

Under penalty of law, I certify that I have examined this return, including accompanying annual report, statements, and schedules, and it is true and complete to the best of my knowledge.

Signature of officer

Print officer's name

Officer's title

Date

Phone number

Email

Paid Preparer's signature

Print preparer's name

Firm's name and address

Date

Preparer's phone number

PTIN or FEIN

Authorize discussion with preparer:

Taxpayer's signature

Print officer's name

Officer's title

Date

Phone number

Email

Enter text✕

What the South Carolina S Corporation Income Tax Return Is

The South Carolina S Corporation Income Tax Return is the state filing used to report an S corporation's South Carolina-source income, adjustments, credits, and allocations to shareholders. It parallels federal S-corporation filings while capturing state-specific adjustments, apportionment details, and any entity-level obligations required by the South Carolina Department of Revenue. Preparers use the return to reconcile federal Form 1120S figures to state taxable income, produce state K-1s or schedules for shareholders, and document payments or estimated tax remittances owed to the state.

Why Accurate State S-Corp Returns Matter

A correct South Carolina S Corporation Income Tax Return ensures shareholders receive accurate state K-1 allocations, avoids penalties for late or incorrect filing, establishes an audit-ready record, and aligns state tax liability with federal reporting. Proper filing also preserves credits and deductions unique to South Carolina and reduces the risk of adjustments that can trigger interest and additional tax assessments.

Why Accurate State S-Corp Returns Matter

Who Prepares and Uses This Return

Corporations and tax professionals prepare and submit this return whenever an S corporation has South Carolina-source activity or shareholders subject to South Carolina tax.

  • S corporation officers and corporate tax managers responsible for state filings and shareholder reporting.
  • CPAs and enrolled agents preparing state S-corp returns, apportionments, and K-1s for clients.
  • Payroll and finance teams reconciling state wage allocations and withholding associated with shareholder-employees.

Filers should confirm whether the corporation or individual shareholders have separate reporting obligations and retain supporting schedules for three to six years as required by federal and state rules.

Step-by-Step: Completing the South Carolina S Corporation Return

Follow these sequential steps to prepare, verify, and submit the state return with supporting schedules and payments.

  • 01
    Gather Documents: Collect federal Form 1120S, schedule K-1s, payroll records, and state-specific adjustment schedules.
  • 02
    Compute Adjustments: Apply South Carolina additions or subtractions to federal taxable income per state instructions.
  • 03
    Prepare K-1 Allocations: Generate shareholder schedules matching allocations and include accurate TINs and ownership percentages.
  • 04
    File and Pay: E-file or mail the return, include payment voucher or EFT, and retain a signed copy for records.

Setting Up an Electronic Workflow for the Return

Configure an e-filing workflow that attaches federal returns, supports signatures, and retains an audit trail for each submission.

Field Configuration
E-file Provider Use a South Carolina DOR–approved e-file provider or approved third-party software for direct transmissions.
Attachments Attach federal Form 1120S and all schedules; include PDF K-1s for each shareholder where required.
Payment Method Configure ACH/EFT or printed voucher options per state payment instructions.
Signature Capture Enable officer signature fields and audit trail capture for legal validity.

Where to File and How Submissions Are Routed

Choose the correct delivery channel—electronic transmission is preferred; paper submissions remain acceptable if allowed by the Department of Revenue.

  • E-file Transmission: Send via approved e-file provider to the South Carolina DOR electronic system.
  • Mailing Address: If paper is allowed, mail the return and payment voucher to the address specified by South Carolina DOR.
  • Payment Processing: Include EFT or check payment details; verify routing and account numbers for ACH.
  • Record Retention: Keep signed copies and transmission receipts for the required retention period.

Key Filing Dates to Watch

Know critical filing and deposit dates to avoid late-filing penalties and interest on unpaid tax.

Return Due Date:

Due by the 15th day of the third month after tax year end (calendar-year S-corps typically March 15).

Extension Filing:

If permitted, file for extension per state instructions; extensions may extend filing, not payment deadlines.

Estimated Payments:

Quarterly estimated payments due per state schedule if the corporation expects tax liability.

K-1 Distribution:

Provide state K-1s to shareholders on or before the corporate filing due date.

Payment Deadlines:

Tax payments are due when the return is due unless otherwise specified by the DOR.

Milestone Timeline for Filing and Post-Submission

A concise sequence of milestones from preparation to post-filing retention helps ensure compliance and readiness for audit.

01

Prepare Federal Return

Complete and finalize Form 1120S and supporting schedules before state adjustments.

02

Adjust for South Carolina

Compute additions/subtractions and determine apportionment factors for state taxable income.

03

File State Return

Transmit the state return and payment by the applicable due date using approved channels.

04

Retain Records

Store signed returns, K-1s, receipts, and workpapers according to retention rules.

Essential Data Elements to Include

Entity Name: Legal corporate name
FEIN: Nine-digit FEIN
Tax Year: Reporting period
Shareholder Details: Names, TINs, percentages
Apportionment Factors: Sales, payroll, property
Supporting Schedules: K-1s and reconciliations

Penalties and Risks for Incorrect or Late Returns

Late Filing Penalty: Interest and late penalties
Incorrect Reporting: Adjustments and assessments
Missing K-1s: Shareholder filing issues
TIN Errors: Backup withholding triggers
Underpayment Penalty: Estimated payment shortfalls
Intentional Disregard: Severe IRC §6721 liability

How the South Carolina Return Differs from Federal Form 1120S

A compact comparison highlights key differences filers should reconcile when completing the state return alongside the federal Form 1120S.

Criteria South Carolina Federal 1120S
Filing Deadline third month 15th day third month 15th day
Shareholder K-1 state k-1s may be required federal k-1 required
Entity-Level Tax state adjustments possible generally pass-through federal
Where Submitted state dor system irs e-file or paper

Core Sections of a Complete South Carolina S Corporation Return

A professional return contains distinct sections that together document income, adjustments, shareholder allocations, payments, and authorization details required by the Department of Revenue.

Cover Sheet

Identifies the corporation, FEIN, tax year, and contact information needed to match the return to corporate records and DOR accounts.

Income & Deductions

Reconciles federal ordinary income, separately stated items, and adjustments specific to South Carolina tax law and computation rules.

Apportionment Schedule

Calculates the South Carolina apportionment percentage using sales, payroll, and property factors per state instructions.

Shareholder Allocations

Attaches K-1 schedules showing each shareholder's share of income, credits, and adjustments for state reporting purposes.

Payment Voucher

Includes payment details for tax due, estimated tax remittances, or electronic payment authorization where supported.

Signatures & Preparer Info

Contains officer signature, date, and preparer identification and declaration, with contact information for follow-up.

Digital Filing and eSignature Requirements

Electronic submission and signature workflows must meet federal e-signature standards and state DOR acceptance criteria.

  • Legal Framework: ESIGN and UETA establish e-signature validity
  • Authentication: Use email, SMS, or stronger signer verification
  • Integrations: Supports Salesforce, NetSuite, Microsoft 365 integrations

Ensure your chosen e-filing and e-signature tools retain an audit trail and meet any South Carolina Department of Revenue format or transmission requirements.

Practical Filing Examples

Two brief scenarios show common filing contexts and practical implications for South Carolina S-corp returns.

Healthcare Practice Example

A multi-owner clinic reconciles federal Form 1120S to state apportionment using payroll and patient revenue.

  • Allocates state K-1s based on residency and work location.
  • The firm retained signed K-1s and an audit trail, which simplified responding to a state information request and avoided penalty adjustments.

Real Estate Holding S-Corp

A property investor uses property and rental receipts to compute the SC apportionment percentage.

  • Adjusts depreciation per state rules.
  • Maintaining detailed schedules and tenant revenue records enabled the preparer to validate the apportionment in an audit and preserved deductions for shareholders.

Practical Tips for Accurate, Efficient Preparation

Adopt consistent processes and document controls to reduce errors and speed preparation while keeping the file audit-ready.

Reconcile Federal and State Figures
Compare line-by-line differences between Form 1120S and the South Carolina return; document reasons for each addition or subtraction to support positions in an audit.
Verify Shareholder Data
Confirm shareholder TINs, addresses, and ownership percentages before issuing K-1s; errors can trigger backup withholding and information return penalties.
Use Approved E-file Channels
Transmit returns through DOR-approved providers when available to receive electronic acknowledgements and reduce postal risk.
Keep an Audit Trail
Retain signed PDFs, transmission receipts, and preparer engagement records to substantiate filings and demonstrate compliance with ESIGN/UETA requirements.

Frequently Asked Questions About the South Carolina S Corporation Income Tax Return

Answers to common issues filers encounter when preparing and submitting the state S-corporation return.


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eSignature Pricing Comparison Relevant to Filing and Signing Returns

Sample vendor pricing and feature indicators for common eSignature providers used to collect signatures on return authorization forms and K-1 acknowledgements.

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