f you're self-employed, a business owner, or receive non-W-2 income, the Q3 estimated tax deadline on September 15, 2026, is fast approaching. Here is what you need to know to avoid IRS underpayment penalties and keep your finances on track.

Start preparing now for the 2026 tax filing season preparation (filing in 2026 for tax year 2025). Print a checklist and follow simple steps to organize documents, adjust withholding and avoid last-minute stress. Read more our step guide tailored just for you.