Knowing the main tax filing deadlines can help you prepare documents, make required payments and avoid last-minute filing problems. However, not every taxpayer has the same deadline, and filing a return is not the only tax date that may matter.
For example, self-employed individuals may need to make estimated tax payments during the year. Meanwhile, taxpayers who request a federal extension generally receive additional time to file, but not additional time to pay the tax due.
Therefore, a useful tax calendar should include more than one date. Understanding the normal April filing deadline, estimated tax periods, extension rules and California requirements can help you plan throughout the year.
START WITH APRIL
When Is the Federal Individual Tax Filing Deadline?
For most calendar-year individual taxpayers, the federal income tax return is normally due on April 15.
However, the exact deadline should be confirmed each filing season. If the normal due date falls on a Saturday, Sunday or legal holiday, the filing deadline generally moves to the next business day.
In addition, special rules can apply to taxpayers affected by federally declared disasters, certain taxpayers living outside the United States and members of the military in qualifying circumstances.
Consequently, April 15 is an important planning date, but it should not be treated as an exception-free deadline for every taxpayer.
THE DATE TO REMEMBER
April 15
The normal federal deadline for most calendar-year individual income tax returns.
Always confirm the specific deadline for the tax year you are filing because weekends, holidays and special relief can affect the actual due date.
YOUR TAX CALENDAR
The Key Dates Many Individual Taxpayers Should Watch
A tax calendar can include filing, payment and estimated tax deadlines.
Therefore, do not focus only on the day your annual return is due.
January 15
The fourth estimated federal income tax payment for the previous calendar year is generally due January 15 of the following year for taxpayers required to make that payment, subject to applicable exceptions.
April 15
For most calendar-year individual taxpayers, April 15 is normally the federal income tax filing and payment deadline. In addition, the first estimated tax payment period generally has an April 15 due date.
June 15
The second estimated tax payment period generally has a June 15 due date. Certain U.S. citizens and resident aliens living and working abroad can also have special filing rules involving June.
September 15
The third estimated federal income tax payment period generally has a September 15 due date.
October 15
Taxpayers who timely obtain the standard six-month federal filing extension generally have until October 15 to file their individual federal income tax return.
EXTENSIONS
An Extension to File Is Not an Extension to Pay
This distinction is one of the most important tax deadline rules to understand. A federal extension generally gives an individual taxpayer more time to submit the return, but it does not normally postpone the original deadline for paying tax owed.
More Time to File
Individuals who cannot complete their federal return by the regular filing deadline can generally request an automatic six-month extension.
For a calendar-year individual taxpayer, a timely extension generally moves the filing deadline to October 15. If October 15 falls on a weekend or legal holiday, the applicable business-day rule can change the exact deadline.
Importantly, taxpayers do not need to wait until October to file. Once the return is complete and accurate, it can generally be submitted before the extended deadline.
Not More Time to Pay
Tax owed is generally still due by the original April filing deadline. Therefore, taxpayers requesting an extension should estimate their tax liability and pay as much as required by the original payment deadline.
Waiting until October to pay a balance simply because you obtained a filing extension can result in additional interest and potential penalties.
Consequently, treat the filing deadline and payment deadline as two separate issues.
ESTIMATED TAX
Self-Employed? You May Have More Than One Tax Deadline
Employees commonly have federal income tax withheld from their paychecks. By contrast, self-employed individuals and taxpayers with certain other income may need to make estimated tax payments during the year.
The IRS divides the year into four estimated tax payment periods. The general due dates are April 15, June 15, September 15 and January 15 of the following year.
However, these dates are sometimes called quarterly estimated payments even though the payment periods are not four equal calendar quarters.
In addition, if a due date falls on a Saturday, Sunday or legal holiday, a payment generally can be made on the next business day.
Therefore, self-employed taxpayers should build estimated payments into their tax calendar instead of waiting until the annual return is due.
ESTIMATED TAX
General Federal Due Dates
April 15
First payment period
June 15
Second payment period
September 15
Third payment period
January 15
Fourth payment period
Always confirm the exact dates for the year involved.
PAY AS YOU GO
Why Estimated Tax Deadlines Matter
Federal income tax generally operates on a pay-as-you-go basis.
As a result, waiting until the annual filing deadline to pay all of the tax can create an underpayment issue for some taxpayers.
Who May Need Estimated Payments?
Self-employed individuals are a common example because clients generally do not withhold federal income tax from independent contractor payments.
Nevertheless, estimated taxes can also affect taxpayers with investment, rental or other income that does not have sufficient withholding.
Missing a Payment Can Matter Even if You Get a Refund
The IRS explains that an underpayment penalty can potentially apply when sufficient tax is not paid by the applicable payment periods, even when the taxpayer later receives a refund after filing.
Therefore, evaluate estimated tax requirements during the year rather than only after preparing the annual return.
CALIFORNIA TAXPAYERS
California Has Its Own Filing and Extension Rules
California taxpayers should track both federal and state obligations. Although the regular California individual income tax deadline generally aligns with the April federal filing period, California’s extension process differs from the federal process.
California’s Automatic Filing Extension
The California Franchise Tax Board generally provides individual taxpayers with an automatic six-month extension to file a state income tax return.
Unlike the federal extension process, taxpayers generally do not need to submit an application simply to receive California’s automatic filing extension.
However, special situations can affect deadlines. Therefore, verify current FTB guidance for the tax year involved.
The California Payment Is Still Due
California’s automatic extension generally applies to filing the return, not to paying the tax due.
Consequently, a taxpayer who expects to owe California income tax should not assume that the October filing extension also postpones the April payment requirement.
This distinction is similar to the federal principle: more time to file does not necessarily mean more time to pay.
BUSINESS OWNERS
Your Business May Have Additional Deadlines
The April individual filing deadline is not a complete tax calendar for every business owner.
Instead, the business structure, payroll responsibilities and tax year can create additional federal and state filing requirements.
Business Returns Can Have Different Due Dates
Partnerships, S corporations, C corporations and other entities do not all follow the same filing deadline. In addition, fiscal-year businesses can have deadlines based on the end of their tax year rather than the calendar-year dates discussed here.
Payroll Creates a Separate Calendar
Employers can also have payroll tax deposits, employment tax returns, wage statements and other deadlines throughout the year.
Consequently, an employer should maintain a separate compliance calendar instead of relying only on the annual income tax filing date.
If you need help keeping employee records and payroll reporting organized, learn more about our payroll services.
SPECIAL DEADLINES
Some Taxpayers Can Receive Additional Time
Tax deadlines can change for taxpayers affected by federally declared disasters or other qualifying circumstances.
For example, IRS disaster relief can postpone certain filing and payment deadlines for taxpayers in designated areas. The specific relief depends on the event, location and IRS announcement.
Special rules can also apply to qualifying members of the Armed Forces serving in combat zones and to certain U.S. citizens and resident aliens living and working abroad.
Therefore, if a special circumstance applies to you, do not assume that the normal April deadline or standard extension rules provide the complete answer.
Instead, check the current IRS guidance for your situation before determining the applicable deadline.
YOUR DEADLINE MAY DIFFER
Check for Special Rules
✓ Disaster tax relief
✓ Combat zone service
✓ Taxpayers abroad
✓ Fiscal-year returns
✓ Certain business entities
Use the deadline that actually applies to your circumstances.
PLAN AHEAD
Don’t Make the Filing Deadline Your Starting Date
Knowing the deadline is useful, but waiting until that date to organize your tax information can create unnecessary pressure.
Instead, begin preparing well before the return is due.
January and February: Gather Documents
Start collecting Forms W-2, 1099 and other applicable tax records as they arrive. Additionally, organize documents related to deductions, credits, dependents and business activity.
Before Filing: Check for Missing Information
Next, compare the documents received with your own records. If you expect another information form, investigate before submitting the return.
Before the Deadline: Address Problems
Finally, determine whether you can complete the return by the regular deadline. If not, review extension options before the due date and calculate any payment that still needs to be made.
MISSED THE DATE?
What if You Miss a Tax Filing Deadline?
Missing a deadline is generally not a reason to postpone filing even longer. Instead, determine what remains unfiled or unpaid and address the situation as soon as possible.
If You Haven’t Filed
File the required return as soon as reasonably possible. Depending on the circumstances, late filing can result in penalties when tax is owed.
Moreover, continuing to wait does not normally solve the underlying filing requirement.
If you are due a refund, separate rules and time limits can affect your ability to claim it. Therefore, old unfiled returns should not simply be ignored.
If You Can’t Pay in Full
Do not confuse inability to pay with inability to file. Filing the return and paying the balance are separate issues.
Therefore, taxpayers who cannot pay everything at once should still address the filing requirement and review available payment options.
Depending on the circumstances, the IRS may offer payment arrangements or other tax debt options.
COMMON QUESTIONS
FAQ About Tax Filing Deadlines
These answers cover several common federal and California deadline questions for individual taxpayers.
For most calendar-year individual taxpayers, the normal federal filing deadline is April 15. However, weekends, legal holidays, disaster relief and certain special filing rules can change the exact date. Therefore, confirm the deadline for the specific tax year you are filing.
Generally, no. A federal extension gives an individual taxpayer additional time to file the return, but tax owed is generally still due by the original April payment deadline. Consequently, estimate and address the tax due even when requesting more time to complete the return.
The general individual estimated tax payment dates are April 15, June 15, September 15 and January 15 of the following year. However, weekend and legal-holiday rules can move a particular due date to the next business day, and special rules can apply in certain circumstances.
California generally provides individual taxpayers an automatic six-month extension to file their state income tax return, so a separate application is generally not required simply to receive that filing extension. However, the extension to file does not normally extend the time to pay California tax due.
When an applicable federal due date falls on a Saturday, Sunday or legal holiday, the deadline generally moves to the next business day. Therefore, always verify the actual IRS deadline for the filing season rather than relying only on the calendar date.
Yes. The IRS can postpone certain filing and payment deadlines for taxpayers affected by qualifying federally declared disasters. The location, tax actions covered and new deadlines depend on the specific relief announcement.
Don’t Wait Until the Tax Deadline to Get Started
Keeping track of tax filing deadlines is easier when your documents are organized and you know which federal and California requirements apply to you.
ASB Tax & Accounting can help you prepare your federal and state income tax returns, review applicable filing requirements and address tax preparation before the deadline arrives.
We serve individuals, families and businesses in Oxnard and surrounding Ventura County communities. In addition, assistance is available in English and Spanish.
Last reviewed: October 2026. Filing, payment, estimated tax and extension deadlines can change because of weekends, legal holidays, disaster relief and other special rules. Always verify the deadline that applies to your specific tax year and circumstances. This article provides general tax information and does not replace individualized tax advice.
