Most small business owners overpay their taxes not through carelessness but through defaults — five decisions that get made by not being made at all. Entity structure, planning cadence, deductions, bookkeeping, and retirement. None of them is complicated once someone shows you the mechanics. All five are nearly impossible to fix after December 31.
Here’s each one, what it actually costs, and the specific fix.
First, a word about who’s telling you this
I’m John Wesevich. My wife and business partner, Margarita Wesevich, and I own Second Mile Financial Services in The Woodlands, Texas. The firm itself is older than our ownership of it — it has been serving clients here for more than 35 years, and we took the helm about three years ago. Between us and our team, there’s more than 75 years of combined experience across corporate finance and small business.
The name isn’t a marketing exercise. It comes from Matthew 5:41 — Jesus asking his followers that if someone compels them to go one mile, they go two. That’s the standard we hold ourselves to with clients: do more than what was asked, go all the way into the situation, and deliver the best work we’re capable of.
Here’s what we’ve learned doing this: the single most common problem our clients arrive with isn’t that they’re overpaying. It’s that they have no idea they’re overpaying. Nobody sends you a letter saying “you left $14,000 on the table this year.” The money just quietly leaves, every April, and you assume that’s what taxes cost.
Our whole job is to fix that — so you’re growing your business and investing in your family instead of unknowingly funding the government.
Let’s go through the five.
Mistake 1: Treating taxes as a springtime event
Most business owners think about their accountant twice a year — once when they drop off the shoebox, once when they get the bill. In between, twelve months of decisions get made with no tax lens on any of them.
Then April arrives, and the conversation goes exactly the same way every time. The owner asks what can be done. And the honest answer is: almost nothing.
Once the calendar year closes, your taxes are largely already written. Every purchase you made or didn’t make, every distribution you took, every asset you did or didn’t place in service, every retirement dollar you did or didn’t contribute — all of it is history. Your accountant at that point isn’t planning. He’s reporting. He’s a historian with a calculator, documenting decisions you already made without him.
That’s not his failure. It’s a calendar problem.
The fix: move the work upstream. Real tax planning is proactive, strategic, and spread across the year. In practice that means four checkpoints rather than one:
- Q1 — close out last year properly and set the baseline for this one.
- Q2 — a midpoint review: is income tracking where you assumed? Are estimated payments right?
- Q3 — the decision quarter. Model the year’s liability while there’s still time to change it. Entity questions, capital expenditure questions, compensation questions all get answered here.
- Q4 — execution before December 31. Assets placed in service. Retirement contributions made. Prepayments timed. Distributions set.
The difference between a business owner who does this and one who doesn’t isn’t intelligence or income. It’s the calendar. One of them has options in October. The other has a receipt in April.
Mistake 2: Running the wrong entity, for years, without noticing
A great many owners start as a sole proprietor. That’s usually the right call at the beginning — it’s the simplest thing in the world, costs nothing, and requires no maintenance.
The problem is that nobody ever revisits it. The business grows from $60,000 of profit to $180,000, and the structure that was correct at the start quietly becomes expensive.
Here’s the mechanic that matters. As a sole proprietor, your entire net business income is exposed to self-employment tax. Not the part you take as pay. All of it. And self-employment tax sits on top of income tax, not instead of it.
Under an S-corporation, income splits into two streams: a reasonable salary, which carries employment tax, and a distribution, which does not. Structured correctly, that split can remove a substantial amount of profit from self-employment tax entirely, year after year.
Two things I want to be straight about, because a lot of firms aren’t:
It isn’t free. An S-corp means running payroll, filing a separate return, and keeping cleaner books. Those costs are real and recurring. Below a certain profit level, they eat the savings.
It isn’t universal. There is a crossover point where the tax savings clear the added cost, and it depends on your profit, your reasonable salary, your state, and your benefits situation. Some of the businesses that come to us asking to convert should not convert. We tell them so.
The fix: run the actual numbers on your actual business before changing anything — and then revisit the answer as profit grows. The Qualified Business Income deduction interacts with all of this too, and because that deduction is now permanent rather than expiring, structuring around it finally makes long-term sense instead of being a two-year bet.
Mistake 3: Only deducting the obvious
Every owner writes off the obvious things. Rent, supplies, the software subscriptions, the contractor invoices. Then there’s a second tier — legitimate, ordinary, entirely legal deductions — that gets missed year after year, not because anyone is being conservative but because nobody explained the rules.
The usual suspects:
Home office. Widely feared, widely misunderstood, and — when you genuinely qualify — worth real money every single year. The fear comes from an audit reputation that hasn’t matched reality in a long time. The rules are specific. Meet them and claim it.
Business meals. Not the whole category, and not at a single flat percentage. Different situations carry different treatment, and the documentation standard is stricter than most owners realize — which is exactly why the deduction gets abandoned instead of claimed correctly.
Depreciation. The largest one on this list by a wide margin. Equipment, machinery, vehicles, and improvements to property can be expensed immediately under current rules, but only if the asset is genuinely placed in service inside the year. Ordered is not the same as placed in service, and that distinction costs someone a full year of deduction every January.
Retirement contributions. Covered in Mistake 5, because it deserves its own section.
The common thread: every one of these carries a documentation requirement, and a deduction you can’t document doesn’t exist. Not in an audit, and often not even in your own year-end numbers, because the record was never made.
The fix: learn which categories apply to your business, set up the recordkeeping once, and then claim them consistently. Done properly, this second tier is where a meaningful share of the annual overpayment lives.
Mistake 4: Books that can’t support the deductions you’re entitled to
“I remember all my expenses.” “I’ll put it in the spreadsheet this weekend.”
Every owner has said one of these. Nobody has ever followed through completely — and the gap between what you actually spent and what got recorded is a straight subtraction from your deductions. No documentation, no deduction. That’s not a technicality. That’s the rule.
But the tax loss is honestly the smaller problem.
Without solid books, what you lose is your financial optics — the ability to see your own business clearly. Specifically, you lose sight of what we call the Big Three:
- Cash flow — what’s actually moving, and when.
- Profitability trends — which direction margins are heading, and in which parts of the business.
- Real tax liability — what you’ll owe, known in time to do something about it.
An owner without these is running the business off the bank balance and instinct. It works, until it doesn’t.
There’s one more piece here that matters more than most owners realize. Personal expenses have to be separated from operating expenses. Not eventually — from now on. Commingled books survive right up until the moment they don’t: a bank underwriting a real loan, or a buyer’s diligence team valuing your company. Both apply the same discount to books they can’t cleanly read, and both discounts are expensive. Clean separation directly improves what you can borrow and what your business is worth at exit.
The fix: get the books current, get them separated, and get a system that keeps them that way without depending on your Sunday evenings. If yours are behind — and a great many are — that’s a bounded project, not a permanent condition.
Mistake 5: Skipping the one deduction where the money stays yours
Owners get absorbed in operations. The business is the retirement plan, the thinking goes — I’ll sell it someday. So tax-advantaged retirement vehicles get postponed, year after year.
This is the one that bothers me most, because of what makes it different from every other deduction on this list.
Every other write-off returns a fraction of money you spent and no longer have. A retirement contribution is the exception: the deduction is immediate, and the money is still yours. Pre-tax dollars reduce this year’s taxable business profit while the balance keeps compounding in your name.
The vehicles vary enormously in what they allow — a SEP IRA, a SIMPLE, a Solo 401(k), and, for consistently high-profit businesses, a defined benefit or cash balance plan that can permit contributions far larger than most owners imagine is possible. They differ in contribution limits, administrative burden, obligations to employees, and, critically, the deadlines for establishing them. Some plans must exist before year-end to count for that year. Discovering this in March is discovering it too late.
The fix: choose the vehicle that matches your profit level and employee situation, establish it inside the deadline, and fund it deliberately rather than with whatever’s left over.
What has a deadline, and what doesn’t
Those five mistakes are permanent features of small business life. The tax environment around them is not, and the current one is widely misunderstood.
The One Big Beautiful Bill Act, signed in July 2025, did two different things that tend to get reported as one. It made a set of provisions permanent, and it created a handful of new ones with expiration dates written in. Knowing which is which changes what you should be in a hurry about.
| Status | Provision |
|---|---|
| Permanent | 100% bonus depreciation on qualifying property acquired on or after January 20, 2025 |
| Permanent | Section 179 expensing, with limits indexed annually for inflation |
| Permanent | The Qualified Business Income deduction |
| Permanent | Full expensing of domestic research and development costs |
| Permanent | The current individual rate brackets |
| Through 2028 | Deductions for tips, overtime pay, car loan interest, and the additional deduction for taxpayers 65 and older |
| Through 2029 | The raised cap on state and local tax deductions, which reverts to a flat $10,000 in 2030 |
| Construction must begin before 2029 | Full expensing of qualified production property, which must also be placed in service before 2031 |
Read the top half of that table as permission to stop rushing. A great deal of year-end advice still describes bonus depreciation as a closing window, because that is what the law said for several years and the correction has not caught up. It is not a window anymore. If the equipment makes sense in March, buy it in March.
Read the bottom half as an actual calendar. Those are the provisions where waiting costs you the benefit outright.
Which brings up the thing I say in every webinar, and want to say here too:
I’m not a proponent of someone going out and buying property or equipment just to have it, to take advantage of the tax benefit. There shouldn’t be a purchase of an asset unless there’s a genuine business need for it, something that helps you grow and expand the business.
A deduction returns a fraction of what you spent. It never returns all of it. If you spend $100,000 on equipment you don’t need, you have not saved money on taxes. You have $100,000 less and a machine you don’t use.
Now that bonus depreciation is permanent, that point matters more rather than less. The artificial deadline that used to push owners into December purchases is gone. What is left is the ordinary question of whether the asset earns its keep, and the ordinary fact that the date it goes into service still decides which year the deduction lands in.
What this looks like when it’s working
A client’s year with us doesn’t look like a filing. It looks like a conversation that never fully stops: a spring reset, a summer check, an autumn modeling session where the real decisions get made, and a December execution list.
We’re deliberately a small firm, and we intend to stay that way. We cap how many clients we take on, because the whole value of this is being reachable when a question comes up in October — not being one file in a stack during a two-month rush. We’re not running a tax assembly line.
What we do run is a one-stop shop: tax preparation and strategic planning, ongoing bookkeeping, and cleanup of prior years when the past needs sorting before the future can be planned. It’s the same team across all of it, which means nobody has to explain the business twice.
Frequently asked questions
Am I actually overpaying my taxes, or does it just feel that way?
The honest answer is that you can’t tell from the outside, and neither can we without looking. What we can say is that in most reviews of a new client’s prior returns, we find something — most often in one of two places: an entity structure that stopped fitting the business a few years ago, and depreciation or retirement contributions that were available and never taken. A review of your last two or three returns will tell you specifically, and it’s a bounded piece of work.
When is it too late to change this year’s taxes?
For most meaningful moves, December 31. Assets have to be placed in service, certain retirement plans have to be established, and prepayment timing decisions have to be executed inside the calendar year. After year-end, a narrow set of options remains — some retirement contributions can still be made after the year closes, and prior returns can be amended when something was genuinely missed — but the large levers are gone. This is exactly why the planning has to happen in the third and fourth quarters.
Do I need an S-corp?
Maybe, and it depends on numbers rather than on principle. The savings come from removing a portion of profit from self-employment tax; the costs come from payroll, a separate return, and stricter bookkeeping. Those two curves cross at a point specific to your profit, your reasonable salary, and your employee situation. Below the crossover it’s a net loss, which is why we tell some owners not to convert. Run the calculation before changing anything.
My books are a mess. Do I have to fix them before doing any tax planning?
Largely, yes — and this frustrates people, so it’s worth explaining why. Tax planning is modeling: it projects what you’ll owe and tests what changes that. A model built on numbers that don’t reflect reality produces confident, wrong answers. The practical sequence is to get the books to a trustworthy state first, then plan. For most businesses that cleanup is a 30-to-90 day project, not an indefinite one.
What’s the single highest-value thing I could do this year?
If your business is profitable and you’ve never had the entity question examined properly, that one. It’s the mistake that compounds — every year in the wrong structure costs again, and nothing recovers the prior years. If the structure is already right, the answer shifts to retirement plan selection, because it’s the only deduction on this list where the deducted money stays in your name.
Does this apply to me if I’m not in Texas?
Yes for everything federal, which is all five mistakes and the entire table of deadlines. State treatment varies — depreciation rules in particular don’t always match federal, and state income tax changes the entity calculation. We’re based in The Woodlands and work with businesses across greater Houston and nationally, and state-level differences get accounted for in the planning.
None of these five is exotic. Not one requires an aggressive position, a clever structure, or anything that would make you uncomfortable explaining it. They’re ordinary decisions that get made by default: the entity nobody revisited, the planning conversation that never got scheduled, the deductions nobody explained, the books that fell behind, the retirement account that was always next year.
The cost of leaving them on default is measured in thousands of dollars a year, every year, quietly.
The fix starts with knowing your own numbers — where you actually stand, and which of the five is costing you most right now.
Ready to find out? Get in touch and we’ll look at your last returns and your current structure, and tell you plainly what we see. If the answer is that you’re in good shape, we’ll tell you that too.
Second Mile Financial Services is a licensed Texas CPA firm in The Woodlands, serving businesses across greater Houston and nationwide. Call (281) 826-0100 or email [email protected].
