Tax season 2027 will be here before most small business owners feel ready. You'll file returns for the 2026 tax year, and that year brought real changes. Some forms have new thresholds. The mileage rate changed in the middle of the year. And several deductions from the 2025 tax law now apply in full. If you wait until March to sort your records, you'll pay for it in stress, late fees, or missed savings. This checklist breaks the work into clear steps. It covers the dates you can't miss, the papers you need to gather, and the new rules that affect your return. It also covers Florida items that local owners often forget. You don't need to be a tax expert to use it. You just need to start early and work through it one section at a time. Here's what to do now so your filing goes smoothly next spring.
Key Filing Dates for the 2027 Season
Missing a deadline is the easiest way to lose money. Penalties start small but grow every month. Put these dates on your calendar today:
- January 15, 2027: Fourth quarter estimated tax payment for 2026 is due.
- February 1, 2027: W-2s and 1099-NEC forms are due to workers and the IRS. January 31 falls on a Sunday, so the deadline moves to Monday.
- March 1, 2027: Paper filing deadline for most other 1099 forms. E-filed versions are due March 31.
- March 15, 2027: S corporation and partnership returns are due, along with Schedule K-1s for each owner.
- April 15, 2027: Individual returns, Schedule C for sole proprietors, and calendar-year C corporation returns are due. The first 2027 estimated payment is also due.
You can request an extension if you need more time. But an extension only gives you more time to file. Any tax you owe is still due on the original date, and interest starts after that.
Get Your Books in Order Before December 31
Good tax prep starts with clean books. If your records are a mess, your tax preparer has to fix them first. That adds hours to the bill and pushes back your filing.
Start by matching every bank and credit card account to your bookkeeping software. Each month should balance to the statement. Then look for transactions sitting in "uncategorized" or "ask my accountant." Sort them now while you still remember what they were.
Next, separate personal and business spending. If the business card paid for a family dinner, record it as an owner draw, not a meal expense. Mixed accounts are one of the most common problems the IRS flags in an audit.
If you've fallen months behind, it may make sense to hand the work off. Many owners in South Florida rely on bookkeeping services miami providers to catch up before year-end instead of rushing in February.
Documents to Collect Now
Once your books are clean, pull these items into one folder. A shared digital folder works best so your preparer can reach everything in one place.
- Profit and loss statement for the full year
- Balance sheet as of December 31, 2026
- Bank and credit card statements for all 12 months
- Receipts and invoices for large purchases like equipment, vehicles, and software
- Loan statements showing interest paid
- Payroll reports and quarterly Form 941 filings
- W-9 forms from every contractor you paid
- Form 1099-K from payment processors like Square, Stripe, or PayPal
- A mileage log split by date
- Home office square footage and related bills
- Health insurance premiums paid for owners
- Retirement plan contribution records
- Your 2025 tax return
Missing even one of these items is a common reason returns get delayed. So check the list twice before you send anything.
What Changed for Your 2026 Return
The One Big Beautiful Bill Act, signed in July 2025, changed several rules for small businesses. Some of those changes show up for the first time on the returns you file in 2027.
The 1099 Threshold Rose to $2,000
This is the biggest paperwork change in decades. For payments made in 2026, you only need to file Form 1099-NEC for a contractor you paid $2,000 or more during the year. The old $600 threshold had been in place since the 1950s. Starting in 2027, the $2,000 figure will adjust for inflation each year.
But keep tracking smaller payments anyway. Not every 1099 category follows the same rule. And payments you made in 2025 still fall under the old $600 limit if you're catching up on late forms. Update your accounting software so it no longer flags vendors at $600.
Also remember that a missing 1099 doesn't make income tax-free. Contractors still owe tax on what they earn, and you still deduct what you paid them.
1099-K Rules Went Back to the Old Limits
Payment apps and card processors now send Form 1099-K only when you pass $20,000 in payments and more than 200 transactions in a year. That's a return to the pre-2022 rules. You still need to report all of that income, whether a form arrives or not.
Two Mileage Rates for One Year
This change catches many owners off guard. The IRS set the 2026 business mileage rate at 72.5 cents per mile in January. Then, after gas prices jumped, it raised the rate to 76 cents per mile for driving from July 1 through December 31. That's the highest business rate on record.
So you need to split your mileage log by date. Miles driven January through June use 72.5 cents. Miles from July onward use 76 cents. Using the higher rate for the full year will overstate your deduction and could cause problems if your return is reviewed.
Full Bonus Depreciation Is Back
The new law brought back 100% bonus depreciation and made it permanent for qualifying property acquired after January 19, 2025. That means you can deduct the full cost of most equipment, machinery, furniture, and certain vehicles in the year you place them in service. Used equipment can qualify too, as long as it's new to your business.
Higher Section 179 Limits
Section 179 is another way to write off equipment right away. For 2026, the deduction limit is $2,560,000. It starts to phase out once total qualifying purchases pass $4,090,000. Heavy SUVs between 6,000 and 14,000 pounds have a separate cap of $32,000.
One thing to know: Section 179 can't create a loss. Your deduction is limited to your business income for the year. Bonus depreciation doesn't have that limit, so the two often work together.
The QBI Deduction Is Now Permanent
The 20% qualified business income deduction was set to expire after 2025. Instead, it became permanent for owners of sole proprietorships, partnerships, LLCs, and S corps. Starting in 2026, there's also a minimum deduction of $400 for owners with at least $1,000 of qualified business income who actively take part in the business. The income levels where the deduction starts to phase out also went up.
Review Payroll and Worker Classification
Before you send any forms, confirm that each worker is classified correctly. If someone works set hours, uses your tools, and follows your process, the IRS may see that person as an employee. Getting this wrong can lead to back payroll taxes, interest, and penalties.
Also make sure every contractor has a current W-9 on file. Collect missing ones now. Chasing a contractor for a tax ID number in late January slows everything down.
For employees, review your year-end payroll totals. Make sure bonuses, gift cards, and personal use of company vehicles are counted as wages on the W-2. These items are taxable even though many owners forget them.
Florida Tasks You Shouldn't Skip
Florida has no state personal income tax. That helps, but business owners here still have state filings to handle:
- Sunbiz annual report: LLCs and corporations must file their annual report with the Florida Division of Corporations between January 1 and May 1. Most entities that miss the deadline pay a $400 late fee.
- Tangible personal property return: This return (Form DR-405) is due April 1 to your county property appraiser. Businesses with equipment worth $25,000 or less may be exempt, but you generally need to file once to claim it.
- Florida corporate income tax: C corporations file Form F-1120 and pay Florida's corporate income tax. Most S corps and multi-member LLCs don't owe it, though some still have a filing requirement.
- Sales and use tax: If you collect sales tax, confirm that every 2026 return was filed and paid on time.
Check Your Estimated Payments
Compare what you paid in estimated taxes during 2026 with what you expect to owe. If you paid too little, the IRS may charge an underpayment penalty.
You can usually avoid that penalty by paying at least 100% of last year's tax. If your adjusted gross income was over $150,000, that number rises to 110%. If you had a strong fourth quarter, a larger January 15 payment can reduce or remove the penalty.
Smart Moves to Make Before Year-End
You still have a few weeks to act. These steps can lower your 2026 tax bill:
- Buy needed equipment and place it in service by December 31 to claim depreciation this year.
- Prepay certain expenses like insurance or rent, if your accounting method allows it.
- Open or fund a retirement plan. A SEP IRA can be set up and funded up to your filing deadline, including extensions.
- Write off customer debts you know you won't collect.
- Pay year-end bonuses before December 31 if you want the deduction in 2026.
- Remember that business meals are still only 50% deductible, so track them carefully.
Only spend money you'd spend anyway. Buying something you don't need just to cut taxes still leaves you with less cash in the bank.
When to Bring in a Professional
Some owners can handle their own taxes. But it gets harder when you have employees, several income streams, large asset purchases, or an S corp election. One mistake with depreciation or worker classification can cost more than a full year of professional fees.
If any part of this checklist feels unclear, talk to someone who prepares business returns every day. Working with an experienced accounting firm miami business owners rely on can help you plan ahead, catch deductions you missed, and file on time.
Spread the Work Out
Tax season goes smoother when you don't do it all at once. Clean your books this month. Gather your records in December. Send your 1099s and W-2s in January. Then hand everything to your preparer by mid-February. That gives you time to fix problems before they turn into penalties, and it keeps tax season from taking over your spring.