7 year-end strategies small businesses are using to prep for tax season

For most small business owners, tax season does not start in April. It's year-round, and doesn't begin until the last weeks of December, when the window closes on many of the moves that shape what they will owe.

That window matters more than many owners realize. In the 2026 Small Business Tax Confidence Report from 1-800Accountant, a survey of 300 small business owners and managers found that nearly six in 10 (59.7%) said they had received an IRS notice or penalty at some point, and 37.7% had received more than one. More than half (57%) said they had claimed a deduction they were not sure about. If this sounds like your experience, embracing simple year-end tax strategies can break the cycle.

Drawing on 1-800Accountant's published research on its small business clients, along with current IRS guidance, here are seven steps owners are taking before December 31 to head into the 2027 filing season with fewer surprises.

1. Cleaning up the books before the year closes

The most common year-end task is also the least glamorous: reconciling business bank and credit card accounts, categorizing stray transactions, and separating anything personal that slipped onto a business card. The Tax Confidence Report found that roughly 14% of owners regularly mix personal and business money, and about 10% still track expenses with what they described as a shoebox approach.

Reconciliation should be a monthly practice, and waiting until March to sort it out is often costly. Expenses that are reconstructed months later are easier to miss and harder to support if the IRS asks questions. Owners who close out December with reconciled books can hand a preparer a finished set of numbers rather than a pile of statements to sort through.

2. Rebuilding the mileage log while trips are still fresh

Vehicle expenses are among the most widely used small business write-offs. According to 1-800Accountant's Small Business Deduction Index, 72% of the firm's clients claim a vehicle deduction, more than any other category. They are also a source of uncertainty: 46% of owners in the Tax Confidence Report said they were unsure how to address vehicle and mileage expenses, the highest share of any category.

This year adds a wrinkle. The IRS raised the standard mileage rate partway through 2026, from 72.5 cents per mile for business driving in the first half of the year to 76 cents starting July 1. That makes a contemporaneous mileage log with the date of each trip especially useful, since miles driven in each half of the year are calculated at different rates. Many owners use a simple mileage log template to fill gaps from their calendars and receipts before memories fade.

3. Timing equipment purchases

For owners already planning to buy equipment, vehicles, or software, the calendar can make a difference. Qualified property acquired after January 19, 2025, is eligible for a 100% special depreciation allowance, which lets a business deduct the full cost in the first year rather than spreading it out over several.

The key detail is that the property generally has to be placed in service, not just ordered, by December 31 to count for 2026. A deduction alone is not a reason to buy something a business does not need, but for planned purchases, a December delivery date versus one scheduled for January can shift the deduction into the next tax year.

4. Catching up on estimated taxes

Quarterly estimated payments are the deadline small business owners are most likely to miss. In the Tax Confidence Report, 45.3% named them as their biggest problem area, well ahead of any other filing date.

The final installment for the 2026 tax year is due January 15, 2027, according to the IRS's estimated tax guidance. Owners who had a stronger year than expected, or who skipped earlier payments, often use the fourth quarter to true up their total and reduce underpayment penalties. Comparing year-to-date profit against what has already been paid is usually enough to show whether the January check needs to be larger.

5. Putting money into a retirement plan

Retirement contributions are one of the few deductions that also leave the owner with something to show for. For 2026, the IRS raised the 401(k) employee contribution limit to $24,500, with an additional $8,000 catch-up contribution allowed for workers 50 and older and a higher catch-up of $11,250 for those ages 60 to 63.

Self-employed owners have several retirement plan options, and the deadlines differ. Some plans need to be in place before year-end to accept specific contributions, while a SEP IRA can generally be opened and funded up to the business's tax-filing deadline, including extensions. December is when many owners check which option still fits their timeline.

6. Taking a second look at business structure

This is also when owners with consistent net business profits consider whether they have outgrown their entity type. The most common question is whether electing S corporation status would lower their taxes.

The answer depends heavily on income. 1-800Accountant's analysis of nearly 7,000 clients, published in The Real Tax Gap Between LLCs and S Corps, estimated that the federal tax savings from an S corp election were negligible for businesses netting under $50,000 and about $470 for those netting $50,000 to $100,000, an amount that added payroll and filing costs can erase. Estimated savings grew to $1,498 in the $100,000 to $150,000 range and $4,791 for those netting more than $250,000.

Timing matters here, too. A calendar-year business that wants an S corp election to apply for all of 2027 generally needs to file Form 2553 by March 15, 2027, which is why many owners run the numbers before the year ends. State-level S corp recognition varies; check with local authorities for any state-specific S corp obligations.

7. Collecting contractor paperwork before January

Businesses that pay freelancers or independent contractors have their own filing deadline. Form 1099-NEC is due to both the IRS and recipients by January 31, which falls on a Sunday in 2027, pushing the deadline to February 1.

The threshold changed this year, but the overall process remains the same. For payments made in 2026, a business generally needs to issue a Form 1099-NEC only when it pays a contractor $2,000 or more, up from $600, according to IRS instructions. Owners who collect a Form W-9 from every contractor before the first payment is made, including names, addresses, and taxpayer identification numbers, avoid chasing that information during the busiest weeks of January when tax season is kicking off.

A smaller scramble in the spring

None of these steps is complicated on its own. What they share is timing: Each one is easier, and in some cases only possible, before the calendar turns. For small business owners, the work done in the next 12 weeks may decide whether tax season feels like a stressful sprint or an efficient business formality.

This story was produced by 1-800Accountant and reviewed and distributed by Stacker.