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June 2026 Tax Deadlines for Individuals and Small Businesses

Summer in Montana is the busy season for many service-based businesses, subcontractors, and real estate professionals. While you are out in the field growing your business, the IRS calendar keeps turning. June brings a wave of essential individual and business tax deadlines that require your attention to avoid unnecessary penalties.

We often talk to our clients about the “three-legged stool” of business stability: keeping your books accurate, your taxes optimized, and your payroll on time. Staying ahead of these June 2026 due dates is a vital part of keeping that stool solid so you can weather challenges and make confident financial decisions.

June 15: The Second Quarter Estimated Tax Deadline

For self-employed individuals, real estate professionals, and small business owners generating between $100K and $500K, June 15 is a critical date. This is the deadline for your Q2 estimated tax installment for the 2026 tax year. The United States operates on a pay-as-you-earn system, meaning that if your income isn't subject to withholding, you must make proactive quarterly payments.

Failing to pay enough can trigger an underpayment penalty, which is calculated quarter-by-quarter based on the federal short-term rate plus 3 percentage points. Fortunately, the IRS offers safe harbors. If your underpayment is less than $1,000, no penalty is assessed. Otherwise, you must prepay either 90% of your current year’s tax liability or 100% of your prior year’s tax (110% if your prior year Adjusted Gross Income exceeded $150,000, or $75,000 if married filing separately).

For example, if you land a massive subcontractor job this spring and your income spikes, relying on last year's safe harbor can protect you from penalties—even if you owe a larger balance next April. State safe harbor rules often differ from federal guidelines, so it pays to review these estimates early.

Tax refund form and pen

June 1 & June 10: IRA Valuations and Tip Reporting

The month kicks off with a June 1 deadline for IRA trustees to issue Form 5498. This form provides IRA owners with the fair market value (FMV) of their accounts as of December 31, 2025. That specific FMV is used to calculate your Required Minimum Distribution (RMD) if you are age 73 or older during 2026.

Shortly after, June 10 brings a deadline crucial to the payroll leg of our business stability stool. Employees who received more than $20 in tips during May must report them to their employer using IRS Form 4070 or a signed written statement. Employers must withhold FICA and income taxes on these tips. If an employee's regular wages cannot cover the withholding, the uncollected amount is reported in box 8 of their W-2, to be settled when their annual return is filed.

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June 15: Extensions for Expats and Military Personnel

U.S. citizens or resident aliens living and working outside the United States and Puerto Rico have until June 15 to file their 2025 income tax returns and pay any tax due. Taxpayers impacted by the terrorist attacks in Israel throughout 2024 and 2025 have an extended deadline of September 30, 2026, for filing and payments originally due between September 30, 2025, and September 30, 2026.

For military personnel serving in combat zones or qualified hazardous duty areas, the IRS automatically extends deadlines by 180 days after leaving the zone or concluding continuous hospitalization. If you are not in a combat zone but simply need more time to file your standard return, you can file Form 4868 to obtain a four-month extension to October 15. However, this only extends the time to file—you must still estimate and pay your liability by the due date to avoid late payment penalties and interest.

Handling Weekends, Holidays, and Disaster Delays

The IRS rule of thumb for deadlines is straightforward: if a due date falls on a Saturday, Sunday, or legal holiday, your deadline automatically moves to the next business day.

Additionally, the IRS grants filing and payment extensions for taxpayers located in federally declared disaster areas. You can verify if your specific region qualifies for disaster-related tax relief by visiting these official resources:

FEMA: https://www.fema.gov/disaster/declarations
IRS: https://www.irs.gov/newsroom/tax-relief-in-disaster-situations

Solidify Your Financial Foundation This Summer

Navigating mid-year tax deadlines does not have to be a distraction. Whether you are a Billings-based real estate agent calculating your Q2 estimated payments or a contractor finalizing payroll, our firm provides practical, personal solutions built on Montana values like simplicity and honesty.

If you have questions about your specific safe harbor estimates or need help keeping the three legs of your business stool perfectly balanced, reach out to our office to schedule a consultation. We are here to ensure your business has the support it needs to thrive.

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