If you just filed your 2025 tax return before the October 15 extension deadline, you probably want a break from tax paperwork. That is understandable, especially if getting the return finished meant chasing missing records while keeping the business running.
But the return you just signed describes last year. The profit you are earning now is building your 2026 tax bill, and some decisions affecting that bill need attention before December 31. Year-end tax planning for small businesses is particularly useful in this window: there is enough of the year behind you to make a reasonable projection, and still time to act on it.
For most individuals who requested an extension, October 15, 2026, was the deadline to file their 2025 federal return. It did not extend the April payment deadline. Business entity deadlines and disaster-related relief can differ. The planning below focuses on calendar-year businesses and their owners.
Start With What the Return Revealed
Before putting the completed return away, ask your accountant to explain anything that surprised you. A larger balance due may reflect higher profit, insufficient estimated payments, or a deduction from the previous year that did not repeat. Each calls for a different response.
Then move to the current numbers. A useful 2026 projection needs reconciled books through September, expected fourth-quarter activity, and the taxes already paid. For owners of pass-through businesses, it also needs the relevant household income, including a spouse’s wages and significant investment gains.
Do not assume the bank balance tells you what is taxable. Loan principal payments and owner draws, for example, can use cash without reducing business profit. This is often where the disconnect begins: the business earned money, but that money is no longer sitting in the account when the tax payment comes due.
Ask for two figures from the projection: the expected remaining tax liability and the amount you should reserve from cash collected through year end. Those numbers are more useful than a general instruction to “set something aside.”
Recheck Estimated Taxes Before Waiting for January
For many calendar-year individuals, the final 2026 estimated federal tax payment is due January 15, 2027. That does not mean every shortfall can wait until then. A late estimated payment generally does not eliminate a penalty attributable to an earlier underpaid installment.
The federal individual safe-harbor rules generally look at timely payments covering at least 90% of current-year tax or 100% of prior-year tax. The prior-year percentage generally becomes 110% when prior-year adjusted gross income exceeded $150,000, or $75,000 for married taxpayers filing separately. Exceptions and other requirements apply.
Meeting a safe harbor can help avoid an underpayment penalty while still leaving a substantial balance due at filing. If business income increased significantly this year, plan for that balance separately.
Owners receiving W-2 wages should also ask whether additional federal income tax withholding from remaining paychecks would help. Withholding is generally treated as paid evenly during the year for estimated-tax purposes, giving it a different effect from a late estimated payment. If income arrived unevenly, the annualized income installment method may also be worth reviewing.
Review Owner Payroll While There Is Time to Correct It
For an S corporation owner who works in the business, distributions do not replace reasonable compensation. Review wages in light of the actual work performed, time devoted to the business, and comparable pay. A fixed percentage of profit is not a universal IRS-approved salary formula.
October is a sensible time to bring your tax advisor and payroll provider into the same conversation. If an adjustment is needed, they can coordinate the remaining payroll runs, withholding, and retirement deferrals before processing deadlines become an obstacle.
Also check health insurance reporting if you own more than 2% of an S corporation. Qualifying premiums paid or reimbursed by the corporation generally need to be included in Box 1 of the owner’s W-2. The personal deduction depends on additional requirements; simply paying the policy personally does not necessarily produce the intended treatment.
The purpose of this review is to make sure compensation and benefits have been handled properly before the final payroll is closed.
Separate Retirement Planning From the Contribution Deadline
Retirement contributions deserve a review now, even when some funding can happen after December 31. Establishing a plan, making a deferral election, processing payroll, and depositing an employer contribution are different steps with different deadlines.
For 2026, the standard employee 401(k) deferral limit is $24,500, subject to compensation and plan rules. The general age-50 catch-up limit is $8,000; eligible participants ages 60 through 63 have a higher $11,250 catch-up limit instead. Pre-tax and Roth contributions have different current-year tax effects.
For 2026, certain higher-paid participants must make catch-up contributions on a Roth basis when their prior-year wages from the sponsoring employer exceeded $150,000. Confirm how that rule applies before counting on a deduction.
If you contribute through payroll, check what can still be deferred from the remaining wages. Do not assume already-paid compensation can simply be relabeled as a retirement contribution next spring. SEP contributions and certain employer contributions may have later deadlines, including applicable filing extensions.
For a business with employees, the cost calculation must include required employee contributions and coverage rules. A large deduction for the owner may be less attractive once the full funding commitment is understood.
Buy Equipment Because the Business Needs It
An equipment purchase can change the tax projection substantially, but “it is deductible” is not enough reason to make it.
Under current federal law, eligible property acquired and placed in service after January 19, 2025, can qualify for 100% bonus depreciation. Section 179 is another potential route, with its own limits and requirements. For a calendar-year business seeking a 2026 depreciation deduction, qualifying equipment generally needs to be ready and available for its intended business use by December 31. An order confirmation or deposit alone is not enough.
Before committing, have your advisor review eligibility, business-use requirements, and the state tax treatment. A federal write-off does not guarantee the same state deduction.
The cash math matters just as much. As a simplified illustration, a fully deductible $10,000 purchase at a 24% federal marginal income tax rate saves $2,400 before other tax interactions. It still costs $7,600 after that assumed saving. Financing may spread out the payments, but it does not remove the obligation.
If the purchase was already needed, timing it may help. If January payroll would become tight, keeping the cash may be the better decision.
Be Deliberate About Moving Income and Expenses
Cash-method businesses generally recognize income when received and deduct eligible expenses when paid. That can create room to time legitimate spending, but the rules do not make every December payment immediately deductible. Prepaid expenses may need to be allocated over time. Nor can you generally defer income merely by leaving an available customer payment uncashed. Accrual-method businesses follow different timing rules.
The business decision comes first. Delaying collection from a slow-paying customer to shift income may create a collection problem that outweighs the tax benefit. Paying a necessary expense early may make sense when cash is strong, but less so when the business is heading into its quiet season.
Ask your advisor to compare the likely effect across both years. Moving a deduction into 2026 is not automatically beneficial if it would be more valuable in 2027.
For eligible pass-through owners, include the qualified business income deduction in that comparison. Some business-related deductions, including certain retirement contributions, also reduce QBI. The total tax savings may therefore differ from the deduction multiplied by your marginal rate.
Make the Next Meeting Specific
You do not need perfectly finalized December books to start this conversation. Bring your latest reconciled profit and loss statement and balance sheet, payroll totals, estimated-payment confirmations, and a realistic fourth-quarter forecast. Flag planned purchases, bonuses, changes in ownership, and any unusually large transactions.
Ask your advisor to identify which decisions require action before December 31 and which can wait until the return is prepared. Put an actual date and responsible person beside the items that need payroll processing, plan paperwork, or vendor delivery.
Year-end tax planning for small businesses works best when the tax projection and the cash forecast are considered together. The aim is to claim the deductions you qualify for, meet your payment obligations, and leave the business able to operate comfortably after the holidays.
Prudent Accountants can help you review your current financials, project your tax position, and work through the decisions that need attention before year end. Schedule a consultation to discuss what makes sense for your business before December 31.
Frequently Asked Questions
Can I still reduce my taxes after the October 15 deadline?
Yes. October 15 generally closes the extended individual filing period for the previous year. Eligible current-year retirement contributions, business expenses, and other planning decisions may still affect 2026 taxes. A new 2026 expense generally cannot be moved back onto your 2025 return.
Did my tax extension give me more time to pay?
No. A regular federal filing extension extends the time to submit the return, not the time to pay. If a balance remains from 2025, address it separately from your 2026 estimated payments; penalties and interest may continue to accrue.
When is the fourth-quarter estimated tax payment due for 2026?
For most calendar-year individuals making federal estimated payments, it is January 15, 2027. State deadlines and special situations can differ. Earlier installment shortfalls should be reviewed now.
Can I avoid an underpayment penalty by paying everything in December?
Not necessarily. Estimated-tax penalties generally depend on when payments were due and made. A December estimated payment may leave earlier underpayments unresolved. Additional wage withholding may be treated differently, so ask your advisor to calculate the alternatives.
Do retirement contributions have to be made by December 31?
Not all of them. Payroll deferrals, deferral elections, employer contributions, and plan establishment have different requirements. A SEP can generally be established and funded by the applicable tax-return deadline, including extensions. Confirm the deadline for your specific plan and contribution type.
Can I contribute to a solo 401(k) if I have employees?
A solo 401(k) is generally intended for an owner-only business, or an owner and spouse. If other employees become eligible, the plan must cover them and ordinary employee-plan requirements apply. Check eligibility before assuming the owner-only rules fit your business.
Does buying equipment before December 31 guarantee a deduction?
No. Eligibility, business use, and the date the equipment is placed in service all matter. For a 2026 depreciation deduction, ordering or paying for equipment that is not ready and available for business use until 2027 generally is not sufficient.
Does taking money out of my business lower my taxes?
A sole proprietor’s draw does not reduce business profit. For partnerships and S corporations, distributions generally are not deductible business expenses, and their tax treatment can depend on basis and other rules. Do not treat a transfer to your personal account as a write-off.
Should I pay next year’s business expenses early to get a deduction?
Only after checking deductibility and cash needs. Prepaid expenses do not always qualify for an immediate deduction, and paying early reduces cash available for operations. Compare the tax benefit with the value of keeping that money available.
What should I send my accountant for year-end tax planning?
Send current reconciled financial statements, year-to-date payroll, estimated-tax payment records, retirement contribution details, and expected fourth-quarter income and spending. Include significant household income changes if your business income flows onto your individual return.
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