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April 2026 Business Tax Due Dates: A Guide for Kent Businesses

Keeping up with tax deadlines is critical for the service-based entrepreneurs and estate planning clients we guide here in Kent, WA. Staying compliant protects your cash flow and keeps your business tax-efficient. Here are the essential April 2026 business tax due dates you need to know.

April 15: Corporate and Fiduciary Deadlines

C-Corporations: File your 2025 calendar year income tax return (Form 1120) and pay any remaining balance. Need more time? File Form 7004 for a six-month extension. Remember, this extends your filing window, not your payment window, so estimate your liability and deposit it to avoid penalties. Your first installment of 2026 estimated tax is also due.

Fiduciary Returns: For our trust and estate clients, timely file your 2025 Form 1041 or request an extension.

Withholdings: If the monthly deposit rule applies, deposit your March Social Security, Medicare, and withheld income tax.

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April 30: Payroll and Unemployment

Form 941: File your first quarter 2026 return and pay any undeposited tax. Liabilities under $2,500 can be paid with a timely filed return. If you already deposited the quarter's tax in full, you have until May 11 to file.

FUTA: Deposit your tax owed through March if it exceeds $500.

Weekends and Disaster Relief

Deadlines falling on weekends or legal holidays automatically shift to the next business day. Geographic areas affected by severe weather may also receive extensions. Verify disaster relief status here:

Alvin Wolcott and the team at Apex Tax & Financial Solutions use a personal touch and cloud technology to make compliance seamless. Contact our Kent office today to coordinate your tax planning services and spring filings.

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