One of the most common questions I receive from clients after tax season goes something like this:
“I thought we filed an extension. Why am I getting a penalty notice from the California Franchise Tax Board?”
It’s a fair question – and one that causes a lot of confusion.
The short answer is:
An extension gives you more time to FILE your tax return. It does NOT give you more time to PAY your taxes.
The Biggest Misunderstanding About Tax Extensions
Many taxpayers believe that filing an extension moves everything to October.
Unfortunately, that’s not how the tax system works.
An extension simply allows additional time to submit the paperwork. The tax itself is still generally due by the original filing deadline.
If the expected tax isn’t paid by that date, California and the IRS may assess:
- Interest
- Late payment penalties
- Underpayment of estimated tax penalties
even if the return itself is filed on time.
The U.S. Tax System Is “Pay As You Go”
The United States uses what’s called aPay-As-You-Go tax system.
This means the government expects taxes to be paidthroughout the year as income is earned, not when the tax return is prepared.
For employees, taxes are usually withheld from each paycheck.
However, many taxpayers receive income with little or no withholding, including:
- Capital gains
- Rental income
- Business income
- Partnership and S corporation K-1 income
- Investment income
- Retirement distributions
When that happens, taxpayers are generally expected to make estimated tax payments during the year.
Filing on Time Doesn’t Always Prevent Penalties
This surprises many people.
A taxpayer may:
✔ File an extension on time.
✔ File the tax return on time.
✔ Pay the remaining balance when filing.
Yet still receive a penalty notice.
Why?
Because the government expected part of that tax to be paid throughout the year—not all at once when the return was filed.
A Real-Life Example
Recently, a client contacted me after receiving a California Franchise Tax Board Balance Due Notice.
He believed that because he had filed an extension, there should not be any penalties.
After reviewing the notice, the issue wasn’t the extension at all.
The extension had been properly filed.
The balance due resulted from taxes that were required to be paid earlier under California’s payment rules. The notice also included interest and penalties that accrued because sufficient tax had not been paid by the original due date.
This is an extremely common misunderstanding, and one I explain to clients every tax season.
How to Avoid This Situation
If you expect significant income during the year, don’t wait until tax season.
Planning ahead can often reduce – or completely eliminate – penalties.
Some options include:
- Making quarterly estimated tax payments.
- Increasing payroll withholding.
- Contacting your CPA before selling investments or receiving large one-time income.
A short planning conversation before the transaction often saves much more than it costs.
Final Thoughts
Receiving a tax notice after filing an extension can be frustrating, especially when you believe everything was done correctly.
The important thing to remember is this:
An extension extends the time to file – not the time to pay.
Understanding that distinction can help you avoid unexpected penalties, interest, and unpleasant surprises.
If you’ve received an IRS or California Franchise Tax Board notice and aren’t sure why, don’t ignore it. Many notices can be explained, and in some cases, the penalties can even be reduced or removed. Please call or email me if you need help.
Read other Case Studies:
What Is a CP2000 Notice – and Why the IRS May Not Always Be Correct
What Happens When You Ignore Unfiled Tax Returns for Years?
Check out FAQ IRS And Tax Questions.
