Tax Deadlines to Know in 2025

"When is the last day to file taxes in 2025?" comes to mind. For the majority of people, it is April 15, 2025.

However, the IRS automatically shifts the due date to the next business day if April 15 falls on a weekend or a federal holiday. Need more time to organize your documents? You can request an extension by filing IRS Form 4868, giving you until October 15, 2025, to submit your return. Keep in mind, this extension only applies to filing — not to payment. You must still pay any owed taxes by April 15 to avoid interest and penalties. Using professional bookkeeping services for small business can help you stay organized and avoid costly delays or errors during tax season.

• ● S corporations, and partnerships that use the calendar year have until March 17, 2025, to file.
• ● C corporations, unless they have a different fiscal year, usually file by April 15, 2025.

Final Estimated Tax Payment for 2024

• ● If you’re self-employed or earn income without withholding (like freelance work or investments), this is your last chance to avoid underpayment penalties.

Tax Filing Season Opens

• ● The IRS starts accepting 2024 tax returns. Filing early can help you get your refund faster and resolve any issues quickly.

W-2 and 1099 Forms Due

• ● Employers must send out W-2s.
• ● Businesses must issue 1099s (NEC, MISC, K, etc.) to freelancers and contractors who earned $600+.

W-4 Exemption Renewal

• ● If you claimed exemption from withholding last year, submit a new Form W-4 to keep that status.

RMD Deadline for New 73-Year-Olds

• ● If you turned 73 in 2024, you must take your first Required Minimum Distribution from retirement accounts by this date.

• ● File your 2024 tax return (Form 1040)
• ● Pay any taxes due
• ● Request an extension (Form 4868)
• ● Make 2024 IRA and HSA contributions Pay Q1 estimated taxes for 2025

Q2 Estimated Tax Payment Due

• ● Covers income earned in April and May 2025.

Q3 Estimated Tax Payment Due

• ● For income earned from June through August.

Extended Filing Deadline

• ● If you requested an extension in April, this is your final day to file your 2024 return.

Final RMD Deadline

• ● All retirees age 73+ must take their 2025 RMD by this date to avoid hefty penalties (up to 25%).

• ● Final Q4 Estimated Tax Payment for 2025

Start of Business Filing Season

• ● IRS begins accepting business tax returns for 2024.

• ● W-2 and 1099 Filing Deadlines for Businesses

Partnerships and S-Corp Returns Due

• ● File Form 1065 or 1120S, unless you’ve requested an extension.

C-Corporation Returns Due

• ● File Form 1120 for calendar-year corporations.

• ● Extended Deadline for Partnerships and S-Corps

• ● Extended Deadline for C-Corps

You have three years from the original filing deadline to claim it. After that, the IRS keeps your money.

Failing to file or pay on time triggers penalties immediately, starting the day after the deadline. File and pay as much as you can to reduce interest and fees.

Pay as soon as possible. To avoid underpayment penalties, aim to pay:

• ● 90% of your current year’s tax liability (or) 100% (or 110% for high earners) of last year’s taxes

Still file on time. The penalty for not filing is worse than the penalty for not paying. The IRS offers payment plans, so get in touch and set one up.

• ● Fastest Way to File: Use e-file with direct deposit. Most refunds arrive in about 21 days.
• ● Need More Time? File Form 4868 to get an extension until October 15 — but remember, payments are still due April 15.
• ● Correcting a Return: Use Form 1040-X if you made a mistake on a previous return. File within 3 years of the original deadline or 2 years from the date you paid.

Whether you’re filing as an individual or business, staying on top of tax deadlines in 2025 will save you money, time, and stress. Set calendar reminders, file early if possible, and don’t hesitate to ask for help if needed.

At Milta, we offer:

• ● Full-service tax filing by experienced professionals who understand your needs
• ● Step-by-step support if you prefer to file on your own, with guidance to make sure everything is accurate and optimized