The main idea is simple. The April return records what has already happened. The amount of tax is driven by decisions made during the year — and most of them close on December 31.
Why taxes turn into a surprise
US taxes don't arrive as a separate bill. Nobody sends a letter in November saying "here is what you will owe." The business runs, money comes in and goes out, and the result becomes a single number only when the return is prepared.
There are three typical reasons that number is unexpected:
- Profit grew, but taxes were planned the old way. It was a good year, yet estimated payments stayed at last year's level — or were never made.
- The business structure didn't change with income. An LLC that made sense at $40,000 of profit can cost noticeably more than necessary at $180,000.
- Everything gets pushed to "later." Bookkeeping is caught up in March, questions for a tax professional come up in April. The tax year closed long before.
The last one is the most expensive. Not because owners are careless — there is always something more urgent during the year. But taxes have a deadline that doesn't move.
Tax preparation and tax planning are different services
Many owners assume that if they have a bookkeeper or a CPA who files the return, taxes are "taken care of." That is only half true.
Tax preparation means preparing and filing the return. The professional takes last year's numbers and reports them correctly on the forms. The job is accuracy.
Tax planning looks at a year that hasn't ended yet: what profit will be, what tax it will produce and which decisions can legally reduce it. The job is finding opportunities while they still exist.
A perfect return can't fix a decision that wasn't made in November. One doesn't replace the other.
Legal tax tools available to US businesses
The US tax code gives businesses many legal ways to lower their tax. Below are the ones we discuss most often with small business owners. This is not a do-it-yourself guide: every tool has conditions, and getting them wrong leads to assessments and penalties. But every owner should know these tools exist.
1. S-Corp election and a reasonable owner salary
The owner of a regular LLC pays self-employment tax — 15.3% — on almost all of the profit. If the company elects S-Corp taxation, the owner takes a salary, and payroll taxes apply only to that salary. The rest of the profit is paid out as distributions, without the 15.3%.
The key word is reasonable salary. It should match the market rate for your role. A zero or token salary is a common reason for IRS questions. An S-Corp also adds costs — payroll and a separate 1120-S return — so the switch doesn't pay off for everyone. It has to be modeled on your numbers.
2. Buying equipment before year-end
Starting in 2025, the One Big Beautiful Bill Act restored 100% bonus depreciation — the ability to deduct the full cost of equipment, machinery and certain other assets in the year of purchase instead of spreading it over years. Section 179 is also available, with a limit above $2.5 million.
The key condition: the asset must not only be bought but also placed in service by December 31. Equipment still in boxes in a warehouse gives no deduction this year. We covered the law's changes in our article on the One Big Beautiful Bill.
One caution: buying things you don't need just for the deduction is a bad idea. A deduction lowers tax, but it doesn't give back the money spent. The tool works when the purchase is needed anyway and the only question is timing.
3. Retirement plans: Solo 401(k) and SEP-IRA
Retirement plan contributions reduce taxable income now, and the money stays yours — in a retirement account. For an owner without employees, this is one of the strongest tools.
In 2026, a Solo 401(k) allows up to $24,500 as an "employee" deferral plus up to 25% of salary as a company contribution (for an S-Corp). A SEP-IRA has different rules and timing: it can be opened and funded up to the tax filing deadline. Which plan fits depends on the business structure, salary and hiring plans — exactly the kind of question worth settling before year-end.
4. The QBI deduction — up to 20% of business income
Owners of pass-through businesses — LLCs, S-Corps, partnerships — can deduct up to 20% of qualified business income (Section 199A). The 2025 law made this deduction permanent.
At higher incomes and for certain professional services, the deduction is limited or phased out. How income and owner salary are split directly affects its size. That's why QBI can't be calculated separately from the other decisions.
5. Accountable plan: reimbursing the owner
If you own an S-Corp and pay some business costs personally — a home office, phone, business trips in your own car — the company can reimburse them under an accountable plan. For the company it's an expense; for you it's not income. The 2026 standard business mileage rate is 72.5 cents per mile.
The condition is documentation: a written company policy, receipts, a mileage log. Without them, reimbursements become ordinary income.
6. Hiring your children in the family business
If your children actually work in the business — creating content, organizing documents, running social media — they can be paid wages. For the business it's an expense, and a child's earned income up to the standard deduction isn't subject to federal income tax. In some business structures, wages paid to children under 18 are also exempt from Social Security and Medicare taxes.
The work must be real, and the pay must be reasonable for that work and age. Timesheets and records are required.
7. Renting your home for business meetings
The rule known as the Augusta rule (Section 280A(g)) lets you rent out your home for up to 14 days a year without tax on that income. If the company rents your home for genuine business events — board meetings, strategy sessions — at a fair market rate, it's an expense for the company.
You need proof of the market rate, meeting minutes and payment from the company account.
8. Timing income and expenses
If the business uses the cash method, it matters in which year money comes in and goes out. Sometimes it's better to prepay certain expenses in December; sometimes the opposite — to recognize income this year if next year's rate will be higher. This is decided from a projection, not by gut feeling.
9. State tax at the entity level (PTET)
Many states allow state income tax to be paid at the company level — the pass-through entity tax. It's a way for owners to work around the federal limit on deducting state taxes (SALT). Each state has its own rules and election deadlines, and some are tied to year-end.
10. Estimated tax payments
This isn't a way to reduce tax, but a way to avoid penalties. The IRS expects tax to be paid as income is earned — four times a year. The last payment for 2026 is due January 15, 2027. If this year was more profitable than last, now is the time to check whether what you've paid is enough. More in our article on quarterly estimated tax payments.
What it looks like in numbers
Three anonymized scenarios — the same ones we walk through in consultations:
- LLC, services, $180,000 profit. Switching to an S-Corp with a reasonable salary of $85,000: payroll taxes apply only to the salary. Savings — about $10,000 a year, after payroll and 1120-S costs.
- Manufacturing, $70,000 of equipment. The purchase was planned for January. The projection showed high 2026 profit — the equipment was bought and placed in service in December. The 2026 tax came out roughly $20,000 lower.
- S-Corp, owner salary $100,000. A Solo 401(k) opened before year-end: $24,500 "employee" deferral plus 25% of salary from the company — a $49,500 deduction. About $14,000 of tax moves into the owner's retirement account.
None of these involved "gray schemes." They involved decisions made on time.
Why December 31 is the real deadline, not April 15
April is the filing deadline. But most decisions that change your tax must be made during the tax year:
- equipment — bought and placed in service by December 31;
- S-Corp owner salary and payroll-based contributions — paid before year-end;
- expenses under the cash method — paid by December 31;
- some retirement plans — set up before year-end;
- the PTET election in a number of states — made by the state's deadline.
After December 31, only a few tools remain — such as a SEP-IRA. That's why the best time for tax planning is October and November: the year's profit is already clear, and there's still time to act.
S-Corp status for next year is also chosen in advance: Form 2553 is due by March 15 of the year the status should take effect. For choosing a company structure, see how to choose a company type in the US.
How tax planning starts at Edeal
We don't start by selling a service. The first step is a free 20-minute kickoff meeting with the Edeal team. We discuss your business and goals, explain how the work goes, and gather your questions and documents — so that time with a CPA or Enrolled Agent is spent on your numbers, not on introductions.
Then you choose a format:
- CPA / EA consultation — if you have a specific question: should you switch to an S-Corp, should you buy equipment before year-end.
- Strategic Tax Session — if you want the professional to find the opportunities: preparation based on your documents, a 2-hour session and a Tax Strategy Roadmap — an action plan with priorities and deadlines.
Frequently asked questions
When is the best time to start tax planning?
During the year — and always before major purchases, deals and the end of the tax year. Ideally in October and November, when the year's profit is already visible.
I already have a bookkeeper who files my return. Why do I need planning?
Return preparation reflects what has already happened. Planning works with decisions that can still be made. They are different tasks, usually done at different times of the year.
Does an S-Corp make sense for every LLC?
No. With modest profit, payroll costs and a separate return can eat up the savings. The switch has to be modeled on your numbers — it usually starts to make sense with steady profit in the tens of thousands of dollars a year.
What if there are only a few weeks left in the year?
Some tools still work: equipment, contributions, expense timing, checking estimated payments. The earlier you start, the more options you have — but there's usually something to do even in December.
Do you work with owners who live outside the US?
Yes. We work with owners of US companies both in the US and abroad. Rules for non-residents differ, and we cover that in the first meeting.
Let's project your tax before December 31
A free 20-minute kickoff meeting with the Edeal team: we'll go over your goals and prepare everything for your session with a CPA or Enrolled Agent.