Small Business Deadlines for Tax Season 2025 (Ew.)

We know your idea of a good time isn’t talking about the 2025 tax season (ick) or keeping track of IRS filing due dates, so we’re motherfugging proud of you for opening this blog post in the first place. 😘

And we pinky promise you that if you’re a small business baddie who wants to stay on top of your tax due dates, this blog post will actually help you.

Grab your calendar bb girl and get ready to mark down the 2025 tax season deadlines that are important as funk for you to remember. 

January 15, 2025: Quarter 4, 2024 Estimated Tax Payment Due

While technically the 2025 tax season doesn’t start until a lil bit later in January, this is the first tax deadline you need to remember because it’s when your quarter 4 tax payment is due. 

And no matter what industry you’re in, but especially for our girlies in the wedding industry, we’re sorry. Becauseeee quarter 4 taxes suck a little extra and that’s cuz you have to pay taxes on 4 months of income (September, October, November, and December). And since that tends to be a lot of seasonal business owners’ busiest season… quarter 4 tax estimate usually hurt a little extra.  

So be mentally prepared to hand over a little extra cashola for quarter 4 estimated tax payments on January 15ths. 

(And if you feel confused as funk about quarterly taxes, this free checklist will help.)

January 27, 2025: The Official Start Date of Tax Season 2025  

Yep, that’s right, January 27th is when the 2025 tax season officially started this year. (Barf.) And that’s when the IRS started processing 2024 tax returns. 

Technically, you can file your 2024 taxes as soon as tax season opens, but we actually don’t recommend it because it’s soops important to make sure you have all your legit tax sh*t first. (AKA 1099s, W2s, etc.). Otherwise, you’ll have to amend your tax return later, and that’s just extra work no one wants. 

January 31, 2025: 1099s & W-2s Due

If you paid a contractor (think: web designer, social media manager, etc.) $600+ via cash, check, wire transfer, or another cash-adjacent method, you had to send them a 1099-NEC by this date. And if you have employees, January 31st was your deadline to send out W-2s.

(If you missed this deadline and are panicking, deep breaths, bb girl. Get it done ASAP to avoid more late fees.) 

March 15, 2025: S-Corp & Partnership Tax Returns Due

If your small business is an S-Corp or a partnership, this is your deadline to file Form 1120-S or 1065. 

April 15, 2025: The Big Daddy 2025 Tax Season Deadline

AKA the tax deadline that has small business baddies (and everyone else) feeling like this:

And that’s because April 15th is when business taxes and personal taxes are due. AND. it’s the deadline for quarter 1 estimated tax payments for 2025. AND. It’s the last day for filing for a tax extension, too. 

(P.S. If you need more time to get your bookkeeping sh*t together, filing an extension will give you until October 15th to officially file your taxes. BUT. You will still need to pay your estimated 2024 taxes by this date. Rude.)

June 15, 2025: Quarter 2 Estimated Tax Payment Due

Unfortunately, quarterly estimate payments are due 4 times a year. Fortunately, this one is isn’t the worst one you’re paying estimated taxes on the income you made for only two months: April and May. 

September 15, 2025: Quarter 3 Estimated Tax Payment Due

Your deadline for your quarter 3 estimated tax payment rolls around in September and is based on the income you made in June, July, and August. (See, it’s back to three months now?! …so weird.)

October 15, 2025: The Final 2025 Tax Season Deadline

This is when taxes are due if you filed an extension for your business (or personal) taxes back in April.

And like we mentioned about above, you should have paid what you thought you owed by April 15th so this tax deadline is for paperwork (and finding out how much more you owe, or if you overpaid in April, how much you’re getting back).

Other Important Deadlines for 2025 Tax Season: Sales Tax (Sorryyyy)

Unlike income tax deadlines, sales tax deadlines depend on the state you live in and are totally different from the tax deadlines above. (Which is annoying as funk and we would change if we could.)

Here’s What to Know about Sales Tax Deadlines in 2025:

Sales Tax Deadlines Vary by State

Every state has its own set of rules. Some require sales tax to be filed monthly, while others want it quarterly, semi-annually, or annually.

Check your Secretary of State website to find these dates and create your portal login (Or, ya know, hire a group of dope bookkeepers to track your tax deadlines for you).

And heads up: if you have customers in multiple states, you might have to pay sales tax in more than one place.

If You File Sales Tax Monthly, Your 2025 Deadlines Are:

For most states, monthly sales tax returns are due on the 20th of the following month. Meaning:

• Your January sales tax is due February 20, 2025
• Your February sales tax is due March 20, 2025
• …And so on

But (because of course there’s a but), some states have different rules, so make sure to double, triple, and quadruple-check for yours.

If You File Sales Tax Quarterly, Your 2025 Deadlines Are:

For most states, quarterly sales tax deadlines will follow this pattern:

• Quarter 1 (Jan – Mar): Due April 20, 2025
• Quarter 2 (Apr – Jun): Due July 20, 2025
• Quarter 3 (Jul – Sep): Due October 20, 2025
• Quarter 4 (Oct – Dec): Due January 20, 2025

Need More Help Surviving Tax Season 2025 as a Small Business Baddie? 

We gotchu. Peruse this bad boy blog post to learn all the must-dos for bookkeeping as a small biz owner. Read this to learn about the 12 most common bookkeeping mistakes to avoid. Or check out our bookkeeping services for bad bad b*tches for hands-on help. 

Love you. (Mean it.)