As summer winds down and September begins, many business owners and individuals are shifting their focus back to school schedules, fall planning, and year-end financial goals. But September also brings with it a series of important tax and accounting deadlines that should not be overlooked. Missing these dates can mean penalties, interest charges, and lost opportunities for tax planning.
At Dynamic Tax and Accounting, we want to make sure you’re prepared. Below, we’ve broken down the key September deadlines, explained who they apply to, and shared strategies to stay compliant while optimizing your finances.
September is a critical month in the IRS and state tax calendars because it signals the start of the fall compliance cycle. By mid-September, businesses and individuals must catch up on estimated payments, extended filings, and payroll obligations.
Failing to prepare now could mean being forced into a stressful October, where October 15 looms as another major IRS deadline for extended individual returns (see our blog: October 15 Tax Extension Deadline: What Late Filers Must Know).
Employers who withhold federal income taxes and FICA (Social Security and Medicare) from employee paychecks and remit on a semi-weekly schedule must deposit taxes by September 9.
Tip: Use the IRS’s Electronic Federal Tax Payment System (EFTPS) to ensure timely deposits. IRS EFTPS Guide
Read more: September Tax & Accounting Deadlines You Can’t Afford to MissSelf-employed workers, freelancers, small business owners, and investors must pay their third-quarter estimated taxes by September 15.
Missing this date could trigger penalties of $210 per partner/shareholder per month until filed.
Certain retirement plans (like SEP IRAs for self-employed individuals or SIMPLE IRAs) have contribution deadlines tied to corporate tax filings. Contributing by the deadline can reduce taxable income and help you save more for retirement.
Check out our blog: Retirement Planning for Business Owners: SEP IRA vs Solo 401(k)
Trustees and executors who filed an extension for 2024 trust or estate income tax returns must submit Form 1041 by September 30, 2025.
Think of September as the warm-up month for October 15, one of the IRS’s most important deadlines. Getting September right makes October far easier. Many taxpayers who miss September deadlines find themselves scrambling—and often paying penalties—by mid-October.
September is packed with deadlines that matter for individuals, small business owners, and corporations alike. From quarterly estimated taxes to extended business returns and trust filings, being proactive now avoids stress later.
Dynamic Tax and Accounting is here to help you file on time, minimize penalties, and plan ahead so you’re not caught off guard.
Don’t let September deadlines catch you by surprise. Contact Dynamic Tax and Accounting today for professional guidance tailored to your situation.
Call Us: (646) 295-3811
Email: admin@dynamicsrv.com
Read more: September Tax & Accounting Deadlines You Can’t Afford to MissDynamic Tax & Accounting has guided hundreds of New York and New Jersey entrepreneurs through entity formation, bookkeeping, and credit-building strategy. Let our experts help you fast-track your business credit goals and keep your books audit-ready while you concentrate on growth.
Call us: (646) 295-3811
Email: admin@dynamicsrv.com
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Call us at (646) 295-3811
Email: admin@dynamicsrv.com
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