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South Carolina Individual Income Tax Filing deadlines and extensions for 2025.
If you are a resident or have been involved in significant business operations within South Carolina, then you might be required to file South Carolina State Taxes. We look at the most important tax deadlines and tax extensions for South Carolina in 2025.
If your clients are residents or have been involved in significant business operations within South Carolina, then they might be required to file South Carolina State Taxes. This guide outlines important tax deadlines and tax extensions for South Carolina in 2025.
South Carolina C Corporation Tax Deadlines for 2025
You must file and pay Corporate Income Taxes in South Carolina by April 15, 2026.
Extension to File Taxes in South Carolina for 2025
The Extension Deadline for South Carolina corporate income tax returns.
South Carolina automatically grants a six-month extension on filing corporate income tax returns if a federal extension is filed. This means you do not need to file for an extension in South Carolina. If there is an amount due, request a state extension and submit payment at dor.sc.gov/pay.
This is an extension to FILE, not an extension to PAY – payment is still due April 15, 2026.
South Carolina S Corporation & Partnership Tax Deadlines for 2025
You must file in South Carolina by March 15, 2026.
Extension to File S Corporation & Partnership Taxes in South Carolina for 2025
The Extension Deadline for South Carolina S Corporation or Partnership income tax returns is September 15, 2026.
South Carolina automatically grants a six-month extension on filing pass-through entity tax returns if a federal extension is filed. This means you do not need to file for an extension in South Carolina. If there is an amount due, request a state extension and submit payment at dor.sc.gov/pay.
This is an extension to FILE, not an extension to PAY – payment is still due March 15, 2026.
Estimated Tax Deadline for South Carolina 2025
Estimated tax payments are due:
See Form SC1040ES instructions for the amount to pay with each voucher.
Individual Tax Deadline for South Carolina 2025
You must file and pay Individual Income Taxes in South Carolina by April 15, 2026.
Extension to File Taxes in South Carolina for 2025
The Extension Deadline for South Carolina Individual Income tax returns is October 15, 2026.
South Carolina will automatically grant a six-month extension on filing personal income taxes if a federal extension is filed and there is no tax due. If you do NOT file a federal extension or have tax due, file Form SC4868.
This is an extension to FILE, not an extension to PAY – payment is still due April 15, 2026.
Estate Tax Deadline for South Carolina 2025
South Carolina does not have an Estate Tax.
Farmer and Fisherman Taxes for South Carolina 2025 If at least 2/3 of your gross income for the taxable year is derived from farming, you may pay estimated tax at any time on or before January 15, 2026. If you wait until January 15, 2026, you must pay the entire balance of the estimated tax. However, if farmers file their tax return on or before March 1, 2026 and pay the total tax at that time, they need not file an estimated tax.
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The material discussed on this page is meant for general illustration and/or informational purposes only and is not to be construed as investment, tax, or legal advice. You must exercise your own independent professional judgment, recognizing that advice should not be based on unreasonable factual or legal assumptions or unreasonably rely upon representations of the client or others. Further, any advice you provide in connection with tax return preparation must comply in full with the requirements of IRS Circular 230.
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