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May 2026 Tax Deadlines for Long Island Businesses

Small business owners across Long Island—from Medford to Brentwood and Mastic—must remain vigilant about financial compliance. Keep these critical May 2026 business tax deadlines on your radar to avoid unnecessary penalties and preserve your cash flow.

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Key May 2026 Filing Dates

May 11: Form 941 Filing
Submit Form 941 for the first quarter of 2026. This specific deadline applies only if you have already deposited your tax for the quarter in full and on time.

May 15: Employer Monthly Deposits
For employers following the monthly deposit rule, this is the deadline to remit Social Security, Medicare, and withheld income taxes for April 2026. It also serves as the due date for April 2026 nonpayroll withholding deposits.

Weekends, Holidays & Disasters

Whenever a standard deadline falls on a weekend or legal holiday, your requirement is automatically pushed to the next business day. Additionally, the IRS provides relief for designated disaster zones. To verify extension eligibility, review these resources:

Need help managing these requirements? Contact our accounting team for personalized tax planning tailored to your Long Island business.

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