dmarconsultingllc is the best resource for accounting and consulting
Founded in 2008, DMAR Consulting LLC is a trusted accounting and business consulting firm dedicated to delivering both traditional accounting services and advanced financial reporting solutions that empower businesses to make informed decisions.
Estimated Taxes
Benefits
If you are employed and your employer is NOT taking out enough taxes adjust your withholdings. If you are self-employed make your estimated payments through out the year to avoid underpayment penalties and interest; spread tax bill in 4 payments; cover self employment tax; easier to budget and for cash flow.
Estimated Tax Payment Dates – Self Employed
- April 15, 2026
- June 15, 2026
- September 15, 2026
- January 15, 2027 (final payment for the 2026 tax year).
Business Tax Deadlines
Business filing deadlines vary by entity type:
May 15, 2026 – Tax‑exempt organizations (Form 990).
March 16, 2026 – Partnerships and S corporations (Forms 1065 and 1120‑S)
April 15, 2026 – C corporations (Form 1120) and estates and trusts (Form 1041)
Same due dates for State of Illinois.