2026 TAX DEADLINES
Quarterly Tax Dates 2026: Q3 September 15 + Q1–Q4 Schedule
The next 2026 quarterly estimated-tax date is September 15. See the complete Q1–Q4 IRS schedule, safe-harbor rules, and free calendar.
TAX & ACCOUNTING INSIGHTS
Plain-English guidance for financial decisions that cannot wait until filing season.
Use this library to understand the questions worth asking, the records worth gathering, and the deadlines that deserve attention. Each article identifies its date and links to primary government guidance.
FEATURED GUIDANCE
Start with a timely tax question.
Tax rules and agency guidance change. Dates, source links, and visible update notes make it easier to judge whether an article still applies.
S-CORPORATIONS
S-Corp Salary and Reasonable Compensation: What the IRS Looks At
How much should an S-Corp owner pay themselves? Review IRS reasonable-compensation factors, payroll, records, and why no fixed salary percentage applies.
FEDERAL TAX LAW UPDATE
One Big Beautiful Bill Act: Tax Changes to Review for 2025 and 2026
What the One Big Beautiful Bill Act changed for individuals and businesses, including new deductions, SALT, expensing, and practical planning steps.
BUSINESS & REAL ESTATE
100% Bonus Depreciation: What Qualifies in 2026?
The 2025 tax law restored permanent 100% bonus depreciation for eligible property acquired and placed in service after Jan. 19, 2025. See what qualifies.
2026 BUSINESS TAX DEADLINES
2026 Partnership, S Corporation, and C Corporation Tax Deadlines
See the 2026 filing and extension deadlines for calendar-year Forms 1065, 1120-S, and 1120, plus Form 7004 and payment reminders.
2026 LLC TAX DEADLINES
2026 LLC Tax Deadlines by Federal Tax Classification
See 2026 federal LLC tax deadlines for single-member LLCs, partnerships, S corporations, and C corporations, including extension and payment rules.
PARTNERSHIP TAX DEADLINES
2026 Partnership Tax Deadline: Form 1065, K-1, and Extension Dates
The 2025 Form 1065 deadline was March 16, 2026. See the September 15 extended deadline, K-1 timing, and what to do if no extension was filed.
S CORPORATION TAX DEADLINES
2026 S Corp Tax Deadline: Form 1120-S, K-1, and Extensions
The 2025 Form 1120-S deadline was March 16, 2026; valid extensions generally run to September 15. Review K-1, payroll, and shareholder timing.
C CORPORATION TAX DEADLINES
2026 C Corp Tax Deadline: Form 1120 and Estimated Tax Dates
Calendar-year C corporations filed 2025 Form 1120 by April 15, 2026; valid extensions generally run to October 15. See payment and estimate dates.
2026 INDIVIDUAL TAX DEADLINE
2026 Individual Tax Extension Deadline: October 15
A timely 2025 Form 4868 generally extends an individual's federal filing deadline to October 15, 2026, but it did not extend the April 15 payment deadline.
2026 FEDERAL TAX CALENDAR
2026 Federal Tax Deadlines Calendar for Individuals and Small Businesses
See 2026 federal tax filing, extension, and estimated-payment deadlines for individuals, partnerships, S corporations, C corporations, and LLCs.
WHAT THIS LIBRARY WILL COVER
Useful answers—not content for content’s sake.
- Business and entity tax returnsPartnerships, C corporations, S corporations, owner reporting, and planning.
- Real estate and investmentsRental activity, depreciation, transactions, estimates, and recordkeeping.
- Complex individual taxesEquity compensation, investment income, multi-state activity, and withholding.
- Deadlines and tax noticesTimely updates, practical response steps, and primary-source links.
- Sales tax for businessesRegistration, return filings, notices, audit support, and multi-state questions.
FREE TAX-PLANNING RESOURCE
Prefer a broader planning overview?
The free Tax Planning Guide introduces deductions, entity structure, equity compensation, payroll, and estimated-tax questions to review before important decisions.
NEED HELP WITH YOUR FACTS?
General guidance is a starting point—not a personal tax plan.
Request a conversation if you want to discuss your business, investments, tax notices, or individual situation.