Tax deadlines can arrive quickly when you are also managing clients, projects, employees, and daily operations. Knowing the major dates and organizing records early can reduce last-minute work.
This article covers the 2025 filing season. Its dates are historical and should not be used as a current deadline calendar.
Major 2025 dates
Quarterly estimated taxes
Business owners and self-employed people who do not have enough tax withheld may need to make estimated payments. The 2025 federal installment dates were:
- April 15, 2025
- June 16, 2025
- September 15, 2025
- January 15, 2026
California may also require estimated payments. Federal and state obligations should be reviewed separately.
Annual income-tax returns
For many individual filers and sole proprietors, the 2024 federal return was due April 15, 2025. An extension provided more time to file, but it did not extend the deadline to pay tax already owed.
Calendar-year S corporations and partnerships generally had a March 17, 2025 filing deadline because March 15 fell on a weekend. S corporations filed Form 1120-S, while partnerships filed Form 1065.
Payroll and information returns
Businesses with employees also had recurring payroll obligations:
- Monthly federal payroll deposits were generally due by the 15th of the following month for monthly depositors.
- Form 941 was generally due by the last day of the month following each quarter.
- Form 940 for 2025 was generally due January 31, 2026.
- Form 1099-NEC recipient statements and IRS filings were generally due January 31.
Deposit schedules and filing requirements depend on the business. A general calendar cannot replace a schedule prepared for a specific employer.
A practical preparation process
Organize the records
Gather bank and credit-card statements, income records, receipts, payroll reports, prior returns, and documents supporting deductions. Reconcile accounts before preparing the return so missing or duplicated activity can be investigated.
Separate tax funds
Set aside money throughout the year rather than waiting for the filing deadline. The appropriate amount depends on profit, entity type, deductions, credits, and federal and state obligations.
Review changes early
Ownership changes, new employees, major purchases, new locations, and changes in entity taxation can affect the return. Discuss them before filing rather than after a deadline has passed.
Confirm current guidance
Tax rules and disaster-relief deadlines can change. Confirm current dates with the IRS, the California Franchise Tax Board, and a qualified tax professional.
Why early preparation matters
An organized process can help a business:
- Identify missing records while there is time to retrieve them.
- Support deductions with complete documentation.
- Estimate the amount due before the payment deadline.
- Avoid preventable late-filing and late-payment penalties.
- Use accurate tax information for planning.
Bean Counter helps businesses organize records, prepare returns, plan estimated payments, and respond to tax notices. Advice should always be based on the taxpayer’s current records and circumstances.