Understanding IRS Deadlines: A Guide for Southern California Taxpayers

Learn about IRS deadlines and penalties to avoid costly mistakes.

2026-03-08 tax-resolution, tax-preparation, irs-notices

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  • Waiting on IRS letters can trigger liens and levies.
  • Missing deadlines costs money—talk to a pro now.

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For taxpayers in Southern California, understanding IRS deadlines is crucial to avoid penalties and ensure compliance. Whether you are an individual or a small business owner, staying informed about key dates and requirements can save you time and money.

Key IRS Deadlines to Remember

Each year, the IRS sets specific deadlines for filing tax returns and making payments. Missing these can lead to penalties and interest charges.

Individual Tax Deadlines

  • April 15: The deadline for filing individual tax returns (Form 1040) and paying any taxes owed. If this date falls on a weekend or holiday, the deadline is the next business day.
  • October 15: If you filed for an extension, this is the final deadline to submit your tax return.

Business Tax Deadlines

  • March 15: The deadline for S-Corporations and partnerships to file their returns (Forms 1120S and 1065). Extensions push this deadline to September 15.

Consequences of Missing Deadlines

Failure to file or pay taxes on time can result in penalties. For late filings, the penalty is typically 5% of the unpaid tax per month, up to 25%. Late payment penalties are generally 0.5% of the unpaid taxes per month. Interest on unpaid taxes also accrues daily.

How to Avoid Penalties

To avoid penalties, mark your calendar with important dates and consider setting reminders. If you anticipate difficulty meeting a deadline, file for an extension using Form 4868 for individuals or Form 7004 for businesses. Remember, an extension to file is not an extension to pay.

Benefits of S-Corporations for Small Businesses

For small business owners, electing S-Corporation status can offer tax benefits, such as avoiding double taxation. However, it's important to meet specific IRS requirements and deadlines, such as filing Form 2553 to make the election.

Consult with a tax professional to ensure you're taking advantage of all available opportunities while staying compliant with IRS regulations.

Frequently asked questions

Can’t find the answer you’re looking for? Reach out to our customer support team.

What happens if I miss a tax deadline?
Missing a tax deadline can result in penalties and interest charges. It's important to file and pay taxes on time to avoid these costs.
Can I file for an extension on my tax return?
Yes, you can file for an extension using Form 4868 for individual taxes or Form 7004 for businesses. However, this only extends the filing deadline, not the payment deadline.

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Anyone may arrange his affairs so that his taxes shall be as low as possible; he is not bound to choose that pattern which best pays the treasury. There is not even a patriotic duty to increase one's taxes. Over and over again the Courts have said that there is nothing sinister in so arranging affairs as to keep taxes as low as possible. Everyone does it, rich and poor alike and all do right, for nobody owes any public duty to pay more than the law demands.



Judge Learned Hand
Chief Judge of the United States Court of Appeals
for the Second Circuit
Gregory v. Helvering, 69 F
Judge Learned Hand

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