The difference between a calm tax season and a miserable one usually isn't how complicated your taxes are. It's how organized things are before the forms start arriving.
December and early January are the best time to get ready. Business is often a little slower, the year's numbers are almost final, and you still have time to track down what's missing. Here's the checklist we'd hand you if you sat down in our office in Moore.
First, know the dates
For most calendar-year filers, the key dates for the 2026 tax year are:
January 15, 2027: Fourth-quarter 2026 estimated tax payment
February 1, 2027: W-2s to employees and 1099-NECs to contractors (January 31 is a Sunday)
March 15, 2027: S corporation and partnership returns (and K-1s to owners)
April 15, 2027: Individual and C corporation returns
One more thing to remember: an extension gives you more time to file, not more time to pay.
If you own a business
Books closed through December 31. Every bank and credit card account reconciled, with transactions in the right categories. This one item makes everything else on the list easier.
Bank, credit card and loan statements for the full year, including year-end loan balances and interest paid.
A list of large purchases such as equipment, vehicles and improvements, with the dates you bought them and started using them. Depreciation depends on those dates.
Payroll reports, including year-end totals and the quarterly payroll filings.
Contractor payments and W-9s. For payments made in 2026, you generally need to send a 1099-NEC to each contractor you paid $2,000 or more (up from $600). Collect any missing W-9s now.
Vehicle mileage logs if you deduct business use of a personal vehicle.
Home office details if you work from home: square footage and the related expenses.
Estimated tax payments you made in 2026, with dates and amounts.
Any letters from the IRS or your state tax agency.
Big changes during the year: new partners, a new location, an entity change, or a business you started or closed.
For your personal return
Income forms: W-2s, 1099-NEC, 1099-INT and 1099-DIV, 1099-B for investment sales, 1099-R for retirement distributions, 1099-K for payment apps or marketplaces, and Social Security statements.
K-1s from any S corporation, partnership or trust you own part of. These often arrive later than other forms, and they're the most common reason a return waits.
Home: Form 1098 for mortgage interest and your property tax records.
Family: childcare costs and the provider's tax ID, Form 1098-T for tuition, and student loan interest (Form 1098-E).
Health: HSA contributions and Form 1095-A if you bought coverage through the Marketplace.
Giving: receipts for charitable donations.
Last year's tax return. It's the best checklist of what you'll need again.
Life changes: marriage, divorce, a new baby, a move, or a new job. Each one can change your return.
Three habits that make tax season easier
1. Keep everything in one place. Pick one folder, physical or digital, and drop each form in as it arrives.
2. Don't file the moment your W-2 shows up. Investment forms, K-1s and corrected 1099s often arrive in February or March. Filing too early can mean amending later.
3. Write down your questions as they come up. Bought a vehicle? Started a side business? Got a letter you didn't understand? A running list beats trying to remember everything at your appointment.
Behind on your books? Start now, not in March
If you're reading this and thinking "my books aren't anywhere near closed," you're not alone. We frequently help clients get caught up and organized before filing. Starting in December gives you options. Starting the week before a deadline mostly gives you an extension.
How we can help
Our tax preparation covers both business and individual returns. Because we stay involved throughout the year, your return is built on clean data, not last-minute scrambling. If you want this checklist to mostly take care of itself, Bookkeeping+ combines monthly bookkeeping, your business tax return, year-round tax strategy and quarterly calls for one predictable monthly fee. Clients typically save around 15% compared to paying for each service separately, and many add their personal return to the bundle.
Questions? Call our Moore office at (405) 919-3965 (Monday through Friday, 7:30am to 5pm) or use the Schedule Free Consultation button on this page.
This article is general information, not tax advice for your specific situation. Talk with a tax professional about your own return.
Josh Walker, Arena Accounting