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  1. Tax Return Due Dates for 2021 Small Business Taxes - The Balance

  2. Online Tax Calendar - Internal Revenue Service

  3. E-file start and stop dates for federal returns - Intuit Accountants

  4. 2021 Federal tax deadlines for your small business - Hiscox

  5. Filing and paying your business taxes - Internal Revenue Service

  6. Tax Day 2021: Tax Filing Deadline | H&R Block

  7. 2021 Small Business Tax Deadlines

  8. Key Business Filing Deadlines for Tax Year 2021

  9. 2021 Tax Deadlines for Small Businesses - Fortune Business

  10. 2021 tax calendar for small business owners

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