Tax Season Doesn't Start in January (and Your Books Know It): Bookkeeping cleanup before tax season
Ask most small business owners when tax season starts and you'll hear "January," right
around the time the first forms show up in the mail. That's when the deadlines start. The work that decides how they go? That happens now.
Bookkeeping cleanup before tax season means getting your 2026 records reconciled, categorized, and complete between October and December, so the first 2027 deadlines find you ready instead of rebuilding a year in a few weeks. It's the difference between filing from a clear picture and filing from a shoebox.
If your books are more shoebox than picture right now, you're not alone. There's still plenty of time on the clock.
By the time the 1099s arrive, the year is already written. The only question is whether it's legible.
"Wait, when does tax season actually start?"
For most small businesses, the first tax year 2026 deadlines land close together:
January 15, 2027: the fourth quarter estimated tax payment for 2026.
February 1, 2027: W-2s go to employees and the Social Security Administration, and 1099-NECs go to contractors and the IRS. January 31 falls on a Sunday, so the date moves to Monday.
March 15, 2027: partnership and S corporation returns for calendar year businesses.
April 15, 2027: individual returns and calendar year C corporation returns.
Count backward from that list. If your books are three months behind on January 2, you're not preparing for tax season. You're reconstructing a year while the clock runs.
Where does your business actually happen?
A cleanup for an online shop looks different from one for a storefront. Here's what we'd look at for three common setups.
Online or remote, with customers anywhere
Minnesota requires a remote seller to collect sales tax after 200 or more retail sales, or more than $100,000 in retail sales, shipped into the state over the prior 12 months. Other states, Florida included, set their own thresholds, so check each state where you have customers.
For 2026, payment apps and marketplaces only issue Form 1099-K when payments exceed $20,000 across more than 200 transactions. That sounds like a break, but it isn't one. The income is still taxable, so your books, not a form, have to be the record. Match each processor payout to the bank deposit, with fees and refunds recorded separately.
Home based, in Stillwater, Minnesota, St. Petersburg, Florida, or anywhere else
A home office can be deductible if a specific area is used regularly and exclusively for business. (The guest room that doubles as the gift wrapping station? That's where "exclusively" gets tricky.) The IRS simplified method allows $5 per square foot for up to 300 square feet, a maximum of $1,500.
St. Pete friends, two local things for you. Anyone with business assets in Pinellas County on January 1, including sole proprietors and self employed contractors, files a tangible personal property return by April 1 each year. Yes, the office furniture counts. You need to file an initial return to get the exemption of up to $25,000 of assessed value, and filing on time each year is what keeps it.
City of St. Petersburg Business Tax Receipts expire on September 30 each year, and renewing in October adds a 10% penalty. If yours isn't renewed yet, no judgment. This week is the week.
A storefront on Main Street or Central Avenue
If you sell from a storefront in Stillwater, Minnesota, give your point of sale (POS) system a quick look. Stillwater added its own 0.5% city sales tax on April 1, 2025, bringing the combined rate to 8.875% for the fourth quarter of 2026. A register charging the old rate is a lot easier to catch in October than to cover in April.
Minnesota employers also file Paid Leave wage detail reports every quarter. The 2026 premium rate is 0.88% of wages, or 0.66% for eligible small employers. Clean payroll records now mean fewer amended reports later.
Buying equipment before year end? For tax years beginning in 2026, the Section 179 limit is $2,560,000, and qualified property acquired after January 19, 2025 is eligible for a permanent 100% bonus depreciation deduction. Just remember a deduction doesn't make a purchase worthwhile on its own. Your books are what tell you whether you need it.
"I'll deal with it in January." (Bookkeeping cleanup before tax season is kinder.)
We get it. But these steps are a lot calmer now than they'll be then. Here's where we'd start.
Reconcile every account through September 30. Bank accounts, credit cards, loans, and payment processors. It's how you find what's missing before it becomes a surprise. If the reconcile screen is part of the problem, QuickBooks Online training and support can help.
Clear out uncategorized transactions. Every "Ask My Accountant" entry is a question someone will have to answer eventually. Fall is cheaper than March.
Separate anything personal. It happens to everyone. Mixed transactions make bookkeeping harder and slow down tax prep.
Collect W-9s from contractors. Good news: for payments made in 2026, the Form 1099-NEC reporting threshold is $2,000. Check who's over the line now so February 1 isn't a scavenger hunt.
Confirm your sales tax setup. Rates, filing frequency, and any new states you've crossed into.
Run a year to date profit and loss report. Use it to plan the January 15 estimated payment. Our post on avoiding a big tax bill covers what to do with those numbers.
Pull together asset records. Purchase dates, costs, and when each item was placed in service. Future you will be grateful.
Busy is a good problem to have. It also tends to mean the books wait. If this list feels like a lot to squeeze in around running your business, you don't have to do it alone. Fall is the time to bring in the right team for cleanup, before tax season starts.
Already behind? That's what fall is for.
If that list made your stomach drop, take a breath. It's common for books to slip in a busy year, especially a profitable one. That's not failure. It just means now is the time to catch up.
We've seen it all, and you won't scare us. We'll find out how far behind the records actually are, then build a realistic plan to get them current. If it's already January when you find this, our post on signs you're behind on tax season picks up from there.
The SBS Way forward
Tax season rewards the people who treated October like it counted. Not because they love spreadsheets (okay, we do), but because a clean set of books turns filing season into a review instead of a rescue.
We work with small businesses across the US, remote and brick and mortar alike, from our clients in Stillwater, Minnesota, St. Petersburg, Florida, and beyond. Want a second set of eyes on your books? Let's talk. No pressure. Just people first accounting that fits your business.
Questions prospective and current clients have asked us recently:
When should I start cleaning up my books for tax season?
Start in the fall. For tax year 2026, the first federal deadlines arrive January 15, 2027 for the fourth quarter estimated payment and February 1, 2027 for W-2s and 1099-NECs. Cleaning up in October through December gives you time to find missing documents, fix miscategorized transactions, and collect contractor information before those dates, instead of reconstructing the year under pressure.
What does a bookkeeping cleanup include?
A cleanup usually means reconciling every bank, credit card, loan, and payment processor account, categorizing uncategorized transactions, separating personal expenses, and confirming payroll and sales tax records match what was filed. It also means gathering contractor W-9s and asset records. The goal is books that are current, complete, and accurate enough to prepare a tax return from without guesswork.
Do I need to send a 1099-NEC to every contractor for 2026?
Not every one. For payments made in 2026, the IRS threshold for reporting nonemployee compensation on Form 1099-NEC is $2,000. Payments below that generally don't require the form, though other rules can apply depending on the payment type. Collecting a W-9 from every contractor now still makes the February 1, 2027 deadline much easier.
My business is online only. Do I have to collect Minnesota sales tax?
It depends on how much you sell into Minnesota. The state requires remote sellers to collect sales tax after 200 or more retail sales, or more than $100,000 in retail sales, shipped into Minnesota over the prior 12 months. Either test triggers it. Every other state sets its own threshold, so review where your customers are before you assume you're in the clear.
Does my business in St. Petersburg, Florida need a business tax receipt?
Yes, if it's located within St. Petersburg city limits. The city requires a Business Tax Receipt for all businesses, professionals, independent contractors, and individuals who accept compensation for merchandise or services within city limits, and its fee schedule includes a home occupation category. Receipts expire every September 30, and renewing in October adds a 10% penalty.
Resources
Official sources we used for this post, current as of September 28, 2026:
IRS: Form 1040-ES, Estimated Tax for Individuals (2026): the January 15, 2027 payment date and the option to file early instead.
IRS: General Instructions for Forms W-2 and W-3 (2026): the February 1, 2027 due dates for W-2s.
IRS: Instructions for Forms 1099-MISC and 1099-NEC: the $2,000 threshold for payments made in 2026, and due dates.
IRS: Publication 509, Tax Calendars: how return due dates are set for partnerships, S corporations, and individuals.
IRS: Understanding your Form 1099-K: the $20,000 and 200 transaction reporting threshold.
IRS: Simplified option for home office deduction: the $5 per square foot method.
IRS: Revenue Procedure 2025-32: the 2026 Section 179 limit.
IRS: Guidance on the additional first year depreciation deduction: 100% bonus depreciation under the 2025 law.
Minnesota Department of Revenue: Sales tax FAQs for remote sellers: Minnesota's remote seller thresholds.
Minnesota Department of Revenue: Local sales and use tax rate guide, Q4 2026: the combined Stillwater rate.
Minnesota Paid Leave: Small employer premiums: 2026 premium rates.
Florida Department of Revenue: Tangible personal property: the April 1 return and $25,000 exemption.
City of St. Petersburg: Business tax receipts: who needs one, renewal, and penalties.
This post is general education, not tax or legal advice for your specific situation. Tax rules change, and the details depend on your business. Talk with our team about yours.
The SBS Way is...
A community-focused team who believe bookkeeping should feel collaborative and empowering, not confusing. Whether you're looking to simplify your systems or get support you can trust, we're here when you're ready. No pressure. Just people-first accounting that fits your business.
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