Tax Due Dates

Individual Taxpayer Deadlines (2024 Tax Year, Filed 2025)

  • Jan 15, 2025
    – 4th-quarter 2024 estimated tax payment due
  • Jan 31, 2025
    – Deadline for employers to issue W-2s and payers to issue 1099-NEC/MISC/1099-K 
  • Jan 27, 2025
    – IRS begins accepting 2024 1040 returns 
  • Apr 15, 2025
    – Deadline to file Form 1040 or request an extension (Form 4868), pay tax due, make IRA/HSA contributions, and pay 1st quarter 2025 estimated tax 
  • Oct 15, 2025
    – Final deadline if extension was filed by April 15

Business & Self-Employed Deadlines (2024 Tax Year, Filed 2025)

  • Jan 15, 2025
    – Q4 2024 estimated tax payment due, including for C-corporations 
  • Jan 31, 2025
    – Forms W‑2 and 1099 due to recipients, Form 940 return

  • Mar 3, 2025
    – Farmers/fishermen file 2024 return if 100% estimated paid by Jan 15

  • Mar 17, 2025
    – S-corp (Form 1120-S) and partnership (Form 1065) returns due or extended; issue K-1s

  • Apr 15, 2025
    – C-corp (Form 1120), sole proprietor Schedule C (Form 1040), and Q1 2025 estimated taxes due

  • Jun 16, 2025, Sept 15, 2025, and Jan 15, 2026
    – Subsequent installments for Q2, Q3, and Q4 estimated taxes (Q2, Q3 for individuals & businesses; Q4 for individuals) .

  • Sept 15, 2025
    – Extended partnership/S-corp returns due (if extended), final K-1s issued

  • Oct 15, 2025
    – Extended C-corp, sole proprietor, and individual returns due (if extended) .

Filing Type

Original Due Date

Extended Due Date

Individuals (Form 1040)

Apr 15, 2025

Oct 15, 2025 (if extended)

Sole Proprietors / C-corps

Apr 15, 2025

Oct 15, 2025 (if extended)

S-corps / Partnerships

Mar 17, 2025

Sept 15, 2025 (if extended)

Estimated Taxes (Q1–Q4)

Apr, Jun, Sept, Jan

Form W-2 / 1099

Jan 31, 2025

If You Need Help, Book a Consultation

Brian J. Markwell, CPA​
Shareholder
AllTax LLC

 

bmarkwell@alltax.pro

(o) 800.202.8902
(c) 612.807.1477
(f) 612.524.5491

Brian J. Markwell, CPA, Shareholder

Brian brings to the table over 25 years of public accounting experience specializing in manufacturing, distribution, construction, service, real estate, software, and overall business and personal taxation. Brian’s experience ranges from one person to multi-tier organizations residing in numerous industries, countries, and publicly traded markets (international and domestic). Client revenues range from startup to $350M in annual sales. He represents individual clients with net worth amounts in excess of $100M+ and the intricate structures inherent in each and every tax portfolio.

The ability to think outside of the box and maintain technical expertise is fundamental in being a valued financial advisor. With Brian’s experience and exceptional client service skills, you will soon come to realize the impact he is able to make for your specific situation.

SPECIFIC EXPERIENCE

• Individual, business, trust, and multi-state taxation (domestic and foreign)

• Tax credits and optimization including bitcoin and electronic currency trading

• Real estate structures and filings including REIT’s, TIC’s and Opportunity Zones

• Complex ownership structures and formation for owners (FLP, Trust, etc.)

• Contract CFO for companies from startup to $350M in consolidated sales

• Executive and employee benefit consulting, including payroll structure and compliance for several small to large businesses

• Phantom stock ownership plans, ESOP’s & executive compensation

• Employee benefitimplementation and administration for large companies

• Private equity relations, reporting, and adherence

• Managed an initial public offering (IPO) on NYSE and S-1 registration

• Compilations, reviews, and audits of private and SEC regulated companies

• Agreed upon procedure engagements & working with lending requirements

• Financial and change management implementation for internal control

• Lease, debt and other legal structuring and analysis

• Succession and estate planning

• IRS & State audits and appeals

• Liquidations, bankruptcies and reorganizations

• Financial policy solution implementation for purchased companies

• Nonprofit accounting and taxation including large 501(c)(3) org’s

INDUSTRY INVOLVEMENT

• AICPA – American Institute of Certified Public Accountants

• MNCPA – Minnesota Society of Certified Public Accountants

EDUCATION

• B.B.A. University of Wisconsin – Eau Claire Magna Cum Laude – Accounting