Plumbers, CPA & Tax Services

Why Plumbing Business Owners in Dallas Need a CPA Who Knows the Trade

Plumbing companies in the Dallas-Fort Worth area deal with tax situations that most general accountants handle poorly: mixed fleets of personal and business vehicles, thousands of dollars in tools and equipment scattered across job sites, apprentice payroll with prevailing wage considerations, and Texas sales tax rules that change depending on how you structure your contracts. Getting any one of these wrong costs you money, either through missed deductions or through penalties you never saw coming.

At AG Freideman, we work with plumbing contractors and service companies across Dallas, Plano, Frisco, Allen, McKinney, and Richardson. Al Freideman is a licensed CPA with over 30 years of experience, and he handles every plumbing client personally. No hand-offs to junior staff, no learning curve every tax season. We understand how your business actually operates, from the truck to the job site to the invoice.

How Do Plumbers Deduct Vehicles, Fuel, and Fleet Costs?

Your service vehicles are one of your biggest expenses and one of your biggest deduction opportunities, but only if they are tracked correctly. For 2026, the IRS standard mileage rate applies to vehicles used for business, and plumbers who use trucks for both personal and business purposes must keep a written mileage log or use a GPS tracking app to separate the two. Without documentation, the IRS can disallow the entire vehicle deduction in an audit.

Most plumbing companies are better served by the actual expense method: deducting fuel, insurance, repairs, tires, and depreciation based on business-use percentage. For trucks and vans placed in service during 2026, Section 179 expensing lets you deduct the full purchase price (up to the annual limit) in the year you buy the vehicle, rather than spreading it over five years. Bonus depreciation remains available as well, though the percentage has been phasing down. Which method saves you more depends on the vehicle’s cost, your mileage split, and your total taxable income. We run both calculations for every plumbing client and choose the one that puts more money back in your pocket.

• Mileage logs: Required by the IRS for any vehicle used partly for personal purposes. No log means no deduction.
• Actual expense method: Often better for plumbers running heavy-duty trucks with high fuel and maintenance costs.
• Section 179 and bonus depreciation: Can allow full write-off of a new or used work truck in the year of purchase.

Tracking Job Materials and Cost of Goods Sold the Right Way

Pipes, fittings, water heaters, valves, solder, and other materials you install on a job are not simple business expenses. They are cost of goods sold (COGS), and the IRS requires you to account for them differently than overhead. Getting this classification right directly affects your gross profit, your tax liability, and your ability to price jobs accurately.

We help plumbing clients set up systems (typically in QuickBooks) that separate job materials from general operating expenses at the point of purchase. When you buy $800 in copper fittings from a supply house, that purchase should be coded to COGS and tied to a specific job or customer. When you buy a $40 box of shop towels, that is an operating expense. The distinction matters because COGS reduces your gross income before other deductions are calculated, and because accurate job costing tells you which types of work are actually profitable.

For plumbers carrying inventory (water heaters, fixtures, common repair parts kept on the truck or in a shop), we also handle year-end inventory counts and valuation. The IRS requires businesses with inventory to account for beginning and ending inventory when calculating COGS.

Apprentice Payroll and Subcontractor Compliance

Plumbing companies that hire apprentices, journeymen, or seasonal helpers face payroll tax obligations that go beyond simply cutting a check. Every W-2 employee requires federal payroll tax withholding (Social Security, Medicare, and federal income tax), plus Texas Workforce Commission (TWC) unemployment insurance contributions. TWC assigns a tax rate based on your claims history, and new employers start at 2.7% on the first $9,000 of each employee’s wages.

The bigger risk we see with plumbing clients is misclassifying workers as 1099 independent contractors when they should be W-2 employees. If you set a worker’s schedule, provide their tools, and control how the work is performed, the IRS and TWC consider that worker an employee regardless of what your agreement says. Misclassification triggers back payroll taxes, penalties, and interest. We set up your payroll correctly from the start and file all quarterly returns (Form 941, TWC wage reports) on time.

Our monthly bookkeeping and payroll packages for Dallas plumbing companies run $300 to $600 per month, covering bank reconciliation, payroll processing, and quarterly filings.

Cash Jobs and Unreported Income: The Risk That Sinks Plumbers

Residential plumbing generates cash and personal check payments more often than most trades. Every dollar of that income is taxable and must be reported, whether or not a receipt was issued. The IRS cross-references bank deposits, material purchases, and lifestyle indicators. If your supply house purchases suggest $400,000 in revenue but your tax return shows $250,000, that gap will trigger scrutiny.

We help plumbing clients build a clean income tracking system so that every payment, including cash, Venmo, Zelle, and check, is recorded and deposited. This protects you in an audit and gives you accurate financial statements for bidding larger commercial jobs or applying for financing. We also ensure your books reconcile to your bank statements every single month, so nothing slips through the cracks.

Texas Sales Tax Rules for Plumbing Contractors

Texas sales tax is one of the most misunderstood obligations for plumbing businesses. The rules depend on how you structure your contracts. Under a lump-sum contract (one price for labor and materials combined), the plumber is considered the consumer of the materials and owes sales tax on the materials at the time of purchase from the supply house. You do not charge sales tax to your customer on a lump-sum job.

Under a separated contract (labor and materials listed as separate line items), you can purchase materials tax-free using a resale certificate and then charge your customer sales tax on the materials portion only. Labor is not taxable in Texas.

Getting this wrong creates two problems: you either double-pay sales tax (paying it at the supply house and again to the Comptroller) or you fail to collect and remit when required, triggering penalties in a Texas Comptroller audit. The combined state and local rate in Dallas County reaches 8.25%. We advise each plumbing client on the contract structure that makes sense for their business and handle all sales tax filings with the Texas Comptroller.

Common Tax Mistakes We Fix for Plumbing Companies

• No mileage logs for service trucks: Without documentation, the IRS disallows vehicle deductions entirely. We set up tracking systems that hold up under audit.
• Mixing job materials with operating expenses: Coding all purchases as “supplies” instead of separating COGS inflates your expense categories and misrepresents your gross margin.
• Misclassifying employees as 1099 subcontractors: This triggers back taxes, penalties from the IRS, and potential fines from the Texas Workforce Commission.
• Failing to file Texas Franchise Tax: Every Texas LLC and corporation must file a franchise tax report annually, even if no tax is owed. Missing the May 15 deadline results in penalties and can jeopardize your entity’s good standing with the Texas Secretary of State.
• Ignoring separated vs. lump-sum sales tax rules: Plumbers who default to lump-sum contracts without understanding the tax implications often overpay sales tax by thousands of dollars per year.

What Plumbing Business Owners Get When They Work With Us

Al Freideman handles every plumbing client personally. You get a licensed CPA with 30 years of experience who understands your industry, not a rotating cast of junior associates. Our 52 five-star Google reviews reflect that personal attention.

Business tax preparation for plumbing companies runs $750 to $1,200 for sole proprietors (Schedule C) and $1,000 to $2,000 for S-Corps and partnerships. We also handle LLC formation ($350 plus the $300 Texas Secretary of State filing fee), registered agent services ($149 per year, included free with any tax or bookkeeping engagement), and IRS representation at $200 per hour if you receive an audit notice or owe back taxes.

Ready to work with a CPA who actually understands plumbing businesses? Call Al directly at (972) 893-3481 or book your free consultation at agfreideman.com/meeting/.