Key Dates in 2024 for Taxes from 2023

Rajachitra Senthivel, EA, CAA

October 22, 2023



Individual Returns


  • Individual income tax returns for the tax year 2023 are due on April 15, 2024, unless you file Form 4868 seeking an extension until October 15, 2024.
  • Please note that missing the tax deadline can have consequences like penalties and interest.
  • If you fail to file your taxes on time, you’ll likely encounter what’s called a Failure to File Penalty. The penalty for failing to file represents 5% of your unpaid tax liability for each month your return is late, up to 25% of your total unpaid taxes.

  • If you’re due a refund, there’s no penalty for failure to file. Though, you do lose the chance of getting that refund. 


Business/Entity Returns

  • Partnerships (including multi-member LLCs) and S-Corps filing are due on March 15, 2024 unless they operate on a fiscal year different from calendar year. A six-month extension to September 15, 2024 (or five months after the original deadline) can be requested using Form 7004.
  • C- corporations filing are due on April 15 2024 and can request an six month extension to October 15, 2024 using form 7004
  • Non-profit filing deadlines are due on May 15, 2024.  A six-month extension to November 15, 2024 can be requested using form 8868.
  • If you have employees and/or contractors you must issue W2 / 1099 by January 31, 2024
  • Limited liability companies (LLCs) and other entities that “pass through” taxes to their partners must issue the K1 form by March 15, 2024
  • Please note that he late filing penalty for both S corps and partnerships is $220 per shareholder/partner for each month the return is late for up to 12 months




Estimated Quarterly Tax Payments 

  • Independent contractors, gig workers, and self-employed people usually have to make quarterly estimated tax payments on these following dates: 
    • January 16 for Q4 '23 dues
    • April 15 for Q1 '24 dues,
    • June 17 for Q2 '24 dues,
    • September 16 for Q3 '24 dues, and
    • January15 '25 for Q4 '24


State/Local Taxes/Filings

  • Property owners will have to pay their property taxes by April 30th and October 31st of every year.
  • Business & Occupation (B&O) Taxes and Sales Tax filing frequency (Annual/Quarterly/Monthly) on your reporting status. Your reporting status your business license. You can also find it online by accessing your FileLocal account. If you do not know your reporting status, contact us.
    • Annual filing due on or before April 30, 2024
    • Quarterly filing due last day of the following month,  The schedule for 2024 are:
      • January 31, 2024 for Q4 '23 B&O
      • April 30, 2024 for Q1 '24 B&O
      • July 31, 2024 for Q2 '24 B&O 
      • September 31, 2024 for Q3 '24 B&O
      • January 31, 2025 for Q4 '24 B&O
    • Monthly filing are due on the last day of the following month
  • Navigating payroll tax due dates in Washington is crucial for businesses to avoid penalties and ensure compliance.  There are five key types of payroll taxes that employers should be aware of:

    • State Unemployment Insurance (SUI) Tax

    • Workers’ Compensation Insurance

    • Paid Family and Medical Leave Premiums

    • Long-Term Care Insurance (WA Cares Fund)

    • State Wage Tax Withholding

  • Penalties and interest are due when taxes are not filed and paid by the due date. The penalty rate varies depending on if it is paid within the first 30 days, 60 days or past 60 days. 

  • Every year, foreign and domestic businesses are required to file an annual report to keep their UBI active and remain in good standing. The Annual Report is due by the last day of the month in which the business was originally formed. For example, if the business is incorporated on March 4th of this year, its Annual Report is due by March 31st the following year and each year thereafter.


Missed the dates

  • If you missed one of these key tax deadlines, you have options. Those options depend on what deadline was missed and whether you owe money or are due for a refund.
  • If you overpaid for the 2023 tax year, there's typically no penalty for filing your tax return late. However, you should file as soon as possible.
  • We estimate the taxes you will owe IRS as part of any extension filing to avoid the penalty and minimize the interests



Keeping track of these dates and filing requirements can be overwhelming and complex.  We offer tax services that include processing all these taxes including necessary e-filing by us on your behalf.  Contact us at RCS if you need help.