MK&A Homepage 2026
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- January 15, 2027
- Q4 2026 Estimated Tax Payment: Deadline for self-employed individuals and business owners to submit fourth-quarter estimated tax payments for the 2026 tax year.
- February 1, 2027
- W-2 & 1099-NEC Filing: Employers must furnish W-2 forms to employees and file with the SSA. Businesses must issue 1099-NEC forms to independent contractors and file with the IRS (shifted from Jan 31 due to Sunday).
- March 15, 2027
- Partnership & S-Corporation Returns (Forms 1065 & 1120-S): Pass-through business tax returns are due.
- Extension Available: File Form 7004 by this date for an automatic 6-month extension to September 15, 2027.
- April 15, 2027
- Individual Income Tax Returns (Form 1040): Annual federal income tax returns and sole proprietorship Schedule C filings are due for the 2026 tax year.
- C-Corporation Returns (Form 1120): Corporate income tax returns are due.
- Prior-Year IRA & HSA Contributions: Last day to fund 2026 Traditional/Roth IRAs and Health Savings Accounts.
- Filing Extensions: Last day to file for an automatic 6-month extension using Form 4868 (individuals) or Form 7004 (corporations) to move your filing deadline to October 15.
- Q1 2027 Estimated Tax Payment: First-quarter estimated tax payment for the 2027 tax year.
- June 15, 2027
- Q2 2027 Estimated Tax Payment: Second-quarter estimated tax payment due.
- September 15, 2027
- Extended Partnership & S-Corp Returns: Extended filing deadline for Form 1065 and Form 1120-S returns.
- Q3 2027 Estimated Tax Payment: Third-quarter estimated tax payment due.
- October 15, 2027
- Extended Individual & C-Corp Returns: Extended filing deadline for individual Form 1040 and C-Corporation Form 1120 returns.
- January 18, 2028
- Q4 2027 Estimated Tax Payment: Final estimated tax payment for the 2027 tax year (shifted from Jan 15 due to the weekend/holiday).
- Monthly & Quarterly Sales Tax
- Recurring Deadline: State sales tax returns are generally due on the 20th of each month (for monthly filers) or the 20th of the month following each calendar quarter (for quarterly filers), depending on local state rules.
Extensions vs. Payments Advisory: An extension of time to file your tax return is NOT an extension of time to pay any taxes owed. If you file for an extension (such as Form 4868 or Form 7004), you must estimate your total liability and pay any expected balance due by the original deadline (April 15 for individuals/C-Corps, March 15 for S-Corps/Partnerships) to avoid interest charges.
Understanding IRS Penalties: The IRS enforces strict civil penalties for late compliance. The two most common penalties assessed on taxpayers are:
- Failure-to-File Penalty: Charged when a tax return is submitted after the due date (typically 5% of unpaid taxes per month, up to 25%).
- Failure-to-Pay Penalty: Charged when a taxpayer fails to pay taxes due on time (generally 0.5% of unpaid taxes per month).
- Business & Information Returns
- Form W-2 & Form 1099-NEC (Wages & Contractor Payments)
- Original Due Date: February 1, 2027 (shifted from Jan 31 due to Sunday)
- Form Explanation: Employers must furnish Form W-2 to employees to report wages and tax withholding, and file copies with the SSA. Businesses must issue Form 1099-NEC to report non-employee compensation to independent contractors and file with the IRS.
- Extensions: Automatic extensions for information returns are generally not granted except under severe hardship or specific administrative waivers requested via Form 8809.
- Form 1065 & Form 1120-S (Partnership & S-Corporation Returns)
- Original Due Date: March 15, 2027
- Form Explanation: Pass-through entities use these returns to report income, deductions, gains, and losses, which flow through to owners’ personal tax returns via Schedule K-1.
- Extension Available: Yes, a 6-month extension can be requested using Form 7004, pushing the extended filing deadline to September 15, 2027.
- Form 1120 (C-Corporation Income Tax Return)
- Original Due Date: April 15, 2027
- Form Explanation: C-Corporations report corporate income, tax liability, and deductions using this primary return.
- Extension Available: Yes, a 6-month extension is available using Form 7004, moving the extended deadline to October 15, 2027.
- Individuals, Family & Retirement Accounts
- Form 1040 (U.S. Individual Income Tax Return)
- Original Due Date: April 15, 2027
- Form Explanation: Used by individuals to file annual income tax returns, reporting total income, calculating tax obligations, and claiming deductions (including single-member LLCs / sole proprietorships via Schedule C).
- Extension Available: Yes, individuals can obtain an automatic 6-month extension by filing Form 4868 by April 15, moving the final extended deadline to October 15, 2027.
- Traditional & Roth IRA and HSA Contributions
- Deadline: April 15, 2027
- Explanation: Final day to make prior-year (2026) contributions to IRAs and HSAs to maximize tax deductions or savings. Extensions to file your tax return do not extend the deadline to contribute to an IRA.
- Sales Tax & Estimated Quarterly Payments
- State Sales Tax Returns (Monthly & Quarterly)
- Deadlines: Monthly returns are due on the 20th of each month following the reporting period. Quarterly returns are due on the 20th of April, July, October, and January (state frequencies and rules may vary).
- Explanation: Businesses registered for sales tax collection must file periodic returns accounting for state and local sales tax collected from customers.
- 2027 Estimated Quarterly Tax Payments (Form 1040-ES)
- Due Dates: Q4 2026 (Jan 15, 2027); Q1 2027 (Apr 15, 2027); Q2 2027 (Jun 15, 2027); Q3 2027 (Sep 15, 2027); Q4 2027 (Jan 18, 2028).
- Explanation: Self-employed individuals, freelancers, partners, and corporate owners expecting to owe $1,000 or more in taxes must make periodic estimated tax payments to avoid underpayment penalties.
Extensions vs. Payments Advisory: An extension of time to file your tax return is NOT an extension of time to pay any taxes owed. If you file for an extension (such as Form 4868 or Form 7004), you must estimate your total liability and pay any expected balance due by the original deadline (April 15 for individuals/C-Corps, March 15 for S-Corps/Partnerships) to avoid interest charges.
Understanding IRS Penalties: The IRS enforces strict civil penalties for late compliance. The two most common penalties assessed on taxpayers are:
- Failure-to-File Penalty: Charged when a tax return is submitted after the due date (typically 5% of unpaid taxes per month, up to 25%).
- Failure-to-Pay Penalty: Charged when a taxpayer fails to pay taxes due on time (generally 0.5% of unpaid taxes per month).
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