Vietnamese Small Business Owners in Houston: The 3 Tax Filing Mistakes I See Every Year

I have prepared tax returns for Houston business owners for 24 years, a large share of them for Vietnamese families running small businesses across Sugar Land, Bellaire, southwest Houston, and the wider metro. Nail salons, restaurants, auto shops, retail, contractors, home-based businesses. And every year, the same three filing mistakes come across my desk. Not because anyone is careless. They happen for specific reasons tied to how a lot of these businesses are built and run, and to a language barrier that makes the IRS harder to deal with than it should be.

I am writing this post in English, but I want to say plainly at the top that I practice in Vietnamese as well as English. My name is Thuy Nguyen, JD, CPA, CTC, CTRS, and I run Nguyen Accounting Group in Sugar Land. I went to South Texas College of Law, I am a Certified Public Accountant, a Certified Tax Coach, and a Certified Tax Resolution Specialist. If your English is strong, this post is for you. If you would rather have this whole conversation in Vietnamese, that is exactly what my office is set up to do. The point of writing it down is so the three mistakes are out in the open where you can check your own situation against them.

None of these three are about anyone doing something wrong on purpose. They are about how the business is structured, how records are kept, and how IRS letters get handled when they arrive in a language that is not your first. All three are fixable. Let me walk through them.

Mistake 1: Cash income that is not fully on the books

Many Vietnamese-owned businesses in Houston run on a lot of cash. Nail salons, restaurants, small retail, repair shops. Cash is normal in these industries and there is nothing wrong with accepting it. The mistake is when cash sales do not all make it onto the books and onto the return.

Sometimes this is deliberate, and I will be direct about that. Sometimes a business owner was told by a friend or a relative that keeping some cash off the books is just how it is done, that everyone does it, that it is fine. It is not fine, and it is far more dangerous than people are told. But just as often it is not deliberate at all. Cash gets used to pay a worker, to buy supplies on a quick run, to make change, and it never gets recorded anywhere. The income and the expense both vanish from the records. The business owner is not hiding anything. The system for capturing it just does not exist.

Why this is dangerous either way. The IRS has indirect methods to estimate income when the books do not look complete. They can look at your bank deposits, your lifestyle, your business type and location, and industry markup ratios, and reconstruct what they believe you actually earned. Cash-intensive industries are exactly where they apply these methods. If the IRS reconstructs a higher income than your return shows, you face the tax on the difference plus accuracy penalties plus interest, and in serious cases it stops being a civil matter. Underreported cash income is also the fastest way to turn a routine return into an audit.

There is also a quieter cost that nobody talks about. Underreporting your income lowers the Social Security earnings on your record, which lowers your future Social Security benefit. It can make it harder to qualify for a mortgage or a business loan, because lenders look at your reported income. And it makes the business look smaller than it is if you ever want to sell it. Reporting your income fully is not just about avoiding the IRS. It is about your own financial future being real on paper.

How to fix it. Capture every dollar of sales, cash included, through a consistent system, a point-of-sale system or a daily cash log that does not depend on memory. Then, and this is the part people miss, capture every legitimate business expense too, including the ones paid in cash. Cash-paid supplies, cash-paid labor, cash-paid repairs, all of it is deductible when it is documented. A lot of cash businesses overpay because they stopped tracking cash expenses at the same time they stopped tracking cash income. Full income with full expenses is almost always a better outcome than partial income with partial expenses, and it is the version that is actually legal.

Mistake 2: Paying workers in cash with no payroll system

This is the second one I see constantly, and it is the one that creates the most personal risk for the business owner. A worker is brought on. They are paid in cash, weekly or every two weeks. There is no W-2, there is no 1099, there is no payroll tax being withheld or deposited. Often the owner genuinely believes this is allowed because the worker is part-time, or family, or because that is how their own first employer paid them.

Here is the problem. If someone works for your business and you control how and when they do the work, the law generally treats them as an employee, and employees require real payroll. That means withholding, it means filing Form 941 every quarter, it means W-2s. Calling someone a contractor to avoid this does not work if they function as an employee, and worker classification is something the IRS and the Texas Workforce Commission both actively look at.

Why this is so personal. When payroll taxes should have been withheld and were not, the IRS can come after the trust fund portion of those taxes, the employee withholding piece, from the business owner personally. It pierces your LLC or corporation. I wrote a full piece on exactly how that works at myhoustoncpa.com/post/how-long-does-tax-resolution-take-in-houston-real-timelines-by-case-type, and I would ask any Houston business owner paying workers in cash to read it, because the personal exposure is the part that is usually a complete surprise. There is also a deduction cost. Wages you paid in cash with no payroll records are hard to deduct, so you may be paying tax on income you actually spent on labor.

How to fix it. If you have workers, set up real payroll. It is less expensive and less complicated than most owners fear, a payroll service handles the filings, and it converts a hidden personal liability into a clean, deductible business expense. If you have been paying in cash and you are behind, the worst move is to keep going and hope. The better move is to come in, get the situation looked at honestly, and get current going forward, because the IRS treats a business that fixes the problem very differently from one that does not.

Mistake 3: IRS letters that sit unopened because of the language barrier

This is the mistake that breaks my heart the most, because it is the most preventable, and the language barrier is the entire cause.

Here is the pattern. An IRS letter arrives. It is in dense English, full of form numbers and legal terms. The business owner reads enough to know it is the IRS and it is not good news. They do not fully understand what it is asking or what the deadline is. They feel a wave of fear and shame. So the letter goes in a drawer. Maybe they will deal with it later. Maybe they will ask a relative to translate it this weekend. Weeks pass. The deadline on the letter passes.

And that is the real damage. Almost every IRS notice has a deadline, and almost every IRS problem is much smaller and cheaper to fix while the deadline is still open. A CP2000 proposing extra tax can usually be disputed down, often a lot, if you respond inside the 30 days. Let the window close and it becomes a 90-day letter, then an assessment, then collection notices, then liens and levies. A CP504 collection notice has a 30-day window where rights are preserved that disappear afterward. The letter sitting in the drawer is not waiting patiently. It is getting more expensive every week.

I want to say something directly to the business owner who has a letter in a drawer right now. There is no shame in this. The IRS writes those letters in a way that is hard for native English speakers to understand, let alone someone reading in a second language. Putting it off is a completely human reaction to a confusing and scary document. But the letter does not get less serious by being ignored, it gets more serious, and the single best thing you can do is bring it to someone who can read it in full and explain it to you in Vietnamese, today, not this weekend.

How to fix it. The moment any IRS letter arrives, find out three things fast: what it is, what it is asking for, and what the deadline is. That is a 15-minute conversation in my office, in Vietnamese if that is easier for you. From there we know whether it is urgent or routine and what the response is. I can file Form 2848, the IRS Power of Attorney, which means future IRS letters come to me instead of landing in your mailbox in English. That alone removes the fear cycle for a lot of clients. The letters stop being a thing you dread in the mail and become a thing your CPA handles.

Why the bilingual piece actually matters here

I am not mentioning that I practice in Vietnamese as a marketing line. It changes the actual quality of the work on these three mistakes specifically.

On the cash income question, an honest conversation about what is really coming in and going out only happens when the business owner can explain their situation precisely, in their own words. That conversation in a second language gets vague, and vague is where mistakes hide. On the worker classification question, the rules are nuanced, and a business owner needs to understand the trade-offs well enough to make a real decision, which means understanding them in the language they think in. On the IRS letter question, it is the whole ballgame. A letter explained clearly in Vietnamese gets acted on. A letter half-understood gets put in a drawer.

There is also a trust dimension. A lot of Vietnamese business owners in Houston have been burned by bad advice from someone in the community who was not actually qualified, or were too intimidated by an English-only firm to ask the questions they really had. Being able to ask anything, in Vietnamese, without feeling rushed or judged, is what turns these three mistakes from recurring problems into things that get fixed once and stay fixed.

What it costs to get these fixed in Houston

Related reading: CPA in Stafford, TX.

Getting these three areas right is not expensive relative to what they cost you when they go wrong. A clean small business return with proper income and expense capture generally runs $400 to $1,500 in the Houston market depending on the entity and the schedules. Setting up real payroll runs a few hundred dollars to set up and a modest monthly cost after that. Responding to an IRS letter early, while the deadline is open, is far cheaper than resolving an assessed balance later. At Nguyen Accounting Group I quote a flat fee after a free consult, never a percentage and never an open hourly meter. For the fuller picture of CPA pricing across Houston, see our pricing guide at myhoustoncpa.com/post/how-much-does-a-cpa-cost-in-houston-a-2026-pricing-guide. And if you are trying to decide whether you even need a CPA or can handle filing yourself, we walk through that at myhoustoncpa.com/post/when-to-hire-a-houston-cpa-and-when-turbotax-is-still-fine-the-2026-decision-guide.

The thing I want Vietnamese business owners in Houston to hear is that doing this correctly is not just the safe choice, it is usually the cheaper choice once you count the penalties, the overpaid tax from untracked expenses, the personal payroll exposure, and the cost of letters that escalated because they sat in a drawer. Correct and complete is the version that protects the business you worked hard to build.

Where Nguyen Accounting Group fits

Tax Return Preparation is one of our five service pillars, alongside Tax Resolution, Strategic Tax Planning, Business Advisory and Fractional CFO work, and Accounting and QuickBooks. These three mistakes touch all five, which is the point. The return preparation has to be built on real books. The cash and payroll issues need accounting and sometimes resolution work. The whole thing benefits from planning so next year is cleaner than this year. I handle this personally, in English or Vietnamese, and because one practitioner sees the whole picture, the three mistakes get addressed together instead of one at a time across three providers who never talk to each other.

FAQ

Is it illegal to keep some cash sales off the books?

For a closer look, see Monthly Bookkeeping Cost for Houston Small Business: 2026 Benchmark.

Yes. All business income is taxable and must be reported, cash included. The IRS uses indirect methods like bank deposit analysis and industry markup ratios to reconstruct income for cash-intensive businesses. Underreported cash income leads to tax on the difference plus penalties and interest, and it is the fastest way to trigger an audit.

Can I pay my workers in cash without running payroll?

If someone works for your business and you control how and when they work, the law generally treats them as an employee, which requires real payroll with withholding, quarterly Form 941 filings, and W-2s. Paying employees in cash with no payroll creates personal liability for the business owner through the trust fund portion of unpaid payroll taxes.

What happens if I ignore an IRS letter because I cannot read it?

Almost every IRS notice has a deadline, and the problem is much smaller and cheaper to fix while the deadline is open. Ignoring a letter lets the window close, after which a proposal becomes an assessment, then collection notices, then liens and levies. The best move is to have the letter read and explained, in Vietnamese if that helps, the day it arrives.

Do you speak Vietnamese at your office?

Yes. Thuy Nguyen is bilingual in English and Vietnamese and practices in both. You can have your entire tax conversation, including IRS letters and business decisions, in Vietnamese. The office is set up specifically to serve Vietnamese-speaking business owners across Sugar Land, Bellaire, southwest Houston, and the wider metro.

I think I have been making these mistakes. Will I get in trouble if I come in?

Coming in to fix a problem is treated very differently from ignoring it. The IRS has paths for business owners who get current and correct their filings going forward. The first step is an honest conversation, in Vietnamese if that is easier, so the situation can be assessed and a plan made. Continuing as is and hoping is the move that actually leads to trouble.

If I report all my cash income, will I just pay more tax?

Not necessarily. Many cash businesses overpay because they stopped tracking cash expenses at the same time they stopped tracking cash income. Reporting full income with full documented expenses, including cash-paid supplies and labor, is often a better outcome than partial income with partial expenses, and it is the version that is legal and protects your Social Security record and your loan eligibility.

What does a small business tax return cost in Houston?

A clean small business return with proper income and expense capture generally runs $400 to $1,500 in the Houston market depending on the entity and schedules. Setting up payroll is a few hundred dollars plus a modest monthly cost. Nguyen Accounting Group quotes a flat fee after a free consult.

Why does working with a bilingual CPA matter for these issues?

An honest conversation about cash income, a real understanding of worker classification trade-offs, and acting on IRS letters all depend on understanding the details in the language you think in. A letter explained clearly in Vietnamese gets acted on. A letter half-understood gets put in a drawer. The bilingual piece changes the quality of the work, not just the comfort of the conversation.

Ready to talk

If any of these three mistakes sounds like your business, the free 30-minute consult is the place to start, in English or Vietnamese. Bring last year return and any IRS letters, opened or not. We will tell you honestly where things stand and what fixing it looks like, with a flat-fee quote. Call (832) 500-4299 or book online. We are at 12440 Emily Ct Suite 303, Sugar Land, TX 77478, Monday through Friday 9 AM to 1 PM and 2 PM to 5 PM.

Every case comes down to the details, which is why we would rather look at yours directly. See our tax planning and advisory services, or a call with our office, and get a clear answer instead of guesswork.