Small Business Tax Prep Checklist for the 2027 Filing Season

Last updated: Nov. 3, 2026. This checklist covers federal returns for tax year 2026, filed in 2027.

Tax season tends to arrive at a busy time. Year-end orders are wrapping up, invoices are going out, and suddenly your accountant is asking for documents you haven’t looked at since spring.

The easiest tax season starts in the fall. This checklist covers the key 2027 deadlines, what changed for tax year 2026, the records to gather, and the moves worth discussing with your tax professional before December 31.

TL;DR

• Mark the big dates: contractor and employee forms are due February 1, 2027, partnership and S corporation returns March 15, and most other business returns April 15.
• Several federal rules changed for 2026, including a higher $2,000 threshold for Forms 1099-NEC and 1099-MISC and a mid-year increase in the business mileage rate.
• Gather income records, expense records, payroll and contractor forms, asset purchases, and last year’s return.
• Meet with your tax professional before year-end, while there’s still time to act.
• Plan ahead for your tax bill, so a large payment doesn’t squeeze your cash flow in the spring.

When are small business taxes due in 2027?

For calendar-year businesses, the main federal deadlines are February 1, 2027, for W-2s and 1099-NECs, March 15 for partnership and S corporation returns, and April 15 for sole proprietor and C corporation returns. When a deadline falls on a weekend or legal holiday, it moves to the next business day, which is why the usual January 31 date moves to February 1 in 2027.

An extension gives you more time to file, not more time to pay. Any tax owed is still due by the original deadline. Fiscal-year businesses follow different dates. Check the IRS Tax Calendar for Businesses and your state’s deadlines too.

What changed for small business taxes in 2026?

The biggest changes for tax year 2026 come from the One Big Beautiful Bill Act, signed in July 2025. It raised the 1099 reporting threshold, restored full bonus depreciation, increased Section 179 expensing, and made the 20% qualified business income deduction permanent. The IRS also raised the business mileage rate partway through the year.

Two practical notes. First, the mileage rate depends on when you drove, so your log needs dates, not just a yearly total. Second, the $2,000 threshold applies to 1099 forms for payments made in 2026; contractors still owe tax on all their income. Ask your tax professional how these changes apply to your business.

What documents do you need to file small business taxes?

You’ll need records of all business income, all deductible expenses, payroll and contractor payments, assets bought or sold, and last year’s return. Use this checklist to gather them before you meet with your tax professional.

Income

• Sales records, invoices, and point-of-sale reports for the year
• Forms 1099-K from payment processors and marketplaces, and any 1099-NEC or 1099-MISC you received
• Business bank statements for all 12 months

Expenses

• Receipts and invoices for business purchases
• Credit card statements, with business charges on personal cards flagged
• A dated mileage log, if you use a vehicle for business
• Home office measurements and costs, if you claim that deduction
• Loan statements showing interest paid on business debt

Payroll and contractors

• Payroll reports and copies of filed Forms 941 or 944
• Copies of the W-2s you issued
• A Form W-9 for each contractor, plus the 1099-NECs you issued

Assets

• Purchase records for equipment, vehicles, or property placed in service in 2026
• Records of any business assets sold or disposed of

Reconciliation and prior records

• Books reconciled to your bank statements for every month
• Personal expenses paid from business accounts, separated out
• Last year’s business return and any IRS or state notices
• Records of estimated tax payments made during 2026

Keeping business and personal spending in separate accounts all year makes most of this list faster. If you don’t have a tax professional yet, see 4 Reasons Why You Should Hire a Tax Accountant for Small Business.

What should you do before December 31 to prepare for taxes?

The weeks before year-end are your last chance to make decisions that affect your 2026 return. A short meeting with your tax professional in November or early December leaves time to act. Topics worth raising:

Your books. Reconcile accounts through November now, so December is the only month left to close in January.

Equipment purchases. With full bonus depreciation and higher Section 179 limits, the timing of a planned purchase may affect your 2026 deductions. Property generally has to be placed in service, not just ordered, by December 31. A purchase should still make sense for your business on its own merits.

Timing of income and expenses. Depending on your accounting method, sending invoices or paying certain bills before or after December 31 can shift income or deductions between years.

Retirement contributions. Some plans must be set up by year-end, while contributions to others can be made later. Ask which deadlines apply to your plan.

Contractor paperwork. Collect a Form W-9 from every contractor now, and track who you’ve paid $2,000 or more in 2026 so the February 1 deadline doesn’t sneak up on you.

Estimated payments. Review whether your 2026 payments are on track, before the January 15 deadline for the fourth quarter.

How can you plan cash flow for your tax bill?

Estimate what you’ll owe early, set money aside as you earn it, and map the payment dates against your expected cash flow. A tax bill is predictable, so it doesn’t have to feel like a surprise.

• Estimate early. Ask your tax professional for a projection in the fall, based on your year-to-date numbers.
• Set aside a share of each deposit. Moving a fixed percentage of revenue into a separate savings account can make the April payment routine.
• Line it up with your slow months. If tax deadlines fall during a slower season for your business, plan for that dip now.
• Know your options. If the bill is larger than expected, ask your tax professional and the IRS about payment options before the deadline. Some owners also compare business financing options to cover timing gaps. Review the total cost and make sure your cash flow can support the repayments before deciding.

For a broader look at the year ahead, see Small Business Financial Plan: 6 Steps to Build One and A Mid-Year Cash Flow Checkup for Small Business Owners.

Frequently asked questions about small business taxes

Do I need to send a 1099 to a contractor I paid $1,500 in 2026? Not for federal reporting. For payments made in 2026, Forms 1099-NEC are required when you pay a contractor $2,000 or more. The contractor still owes tax on that income, and some states have their own rules.

Does a tax extension give me more time to pay? No. An extension gives you more time to file your return. Any tax you owe is still due by the original deadline, and interest and penalties can apply to late payments.

When is the 2026 business tax deadline for an LLC? It depends on how the LLC is taxed. A single-member LLC taxed as a sole proprietorship files with your personal return by April 15, 2027. A multi-member LLC taxed as a partnership files by March 15, 2027.

What is the IRS mileage rate for 2026? The business standard mileage rate is 72.5 cents per mile for driving from January 1 through June 30, 2026, and 76 cents per mile from July 1 through December 31, 2026.

How long should I keep business tax records? The IRS generally recommends keeping records for at least three years after you file, and longer in some situations, such as employment tax records or records for assets you still own. Ask your tax professional what applies to you. For more, see 5 Business Records That Small Business Owners Need to Keep.

Do I need to make estimated tax payments? Generally, yes, if you expect to owe $1,000 or more in federal tax for the year as an individual, or $500 or more as a C corporation. Payments are due quarterly.

The bottom line

A smooth tax season comes from steady preparation: knowing the 2027 deadlines, understanding what changed for 2026, keeping records organized, and planning for the payment. Start the conversation with your tax professional before December 31, while there’s still time to act.

Planning for the year ahead?

Tax season is one of many moments that can put pressure on cash flow. IOU Financial offers financing solutions for established small businesses, with applications subject to credit review and underwriting. See My Options → or talk to an IOU Financial advisor.

Sources

• IRS, IRS sets 2026 business standard mileage rate at 72.5 cents per mile (IR-2025-128)
• CPA Practice Advisor, IRS business mileage rate increases to 76 cents per mile (Announcement 2026-11)
• Spidell, IRS releases inflation figures for 2026 (Rev. Proc. 2025-32, Section 179 limits)
• Ohio State University Farm Office, Navigating 1099 forms ($2,000 threshold)
• OnPay, 1099 reporting threshold updates (1099-K threshold)
• NFIB, One Big Beautiful Bill business provision summaries

This article is for general information only and isn’t tax, legal, or financial advice. Tax rules change and depend on your situation. Consult a qualified tax professional.