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The tax code has a lot to say to anyone stepping out of the workforce and into entrepreneurship. With the passage of the One Big Beautiful Bill Act (OBBBA) in July 2025, the rules for new business owners became considerably more favorable — and for a trade professional launching a company in 2026, the timing couldn’t be better.
There are plenty of stories about people with a lot of current responsibility starting from small and humble beginnings. The newly-confirmed U.S. Secretary of Homeland Security Markwayne Mullin had an early career in his family’s plumbing business in Tulsa, Oklahoma. According to the department’s website, “over the past 28 years, Secretary Mullin expanded Mullin Plumbing to become the largest service company in the region.”1
Let’s break down what a first-year plumbing business owner — or business owner in any other traditional trade —could expect to spend, and how the tax code can help take the sting out of those early expenses.
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🧾 The Deets, Clean and Quick — The Plumber Scenario
🔧 Part I: First-Year Startup Expenditures
Launching a solo or small-team plumbing operation involves a range of one-time and ongoing costs. Consider the following illustrative example.
According to the company Financial Models Lab, single-operator startup typically runs $15,000 to $50,000 to get off the ground. A two-van operation with staff can require $60,000 to $127,000 or more in initial capital expenditures alone — before working capital is factored in.2
Here is the model breakdown of the core startup cost categories for 2026, along with the relevant Internal Revenue Code (IRC) provisions that apply:
Table 1: First-Year Plumbing Business Startup Expenditures (2026)
Startup Cost Category | Estimated Low | Estimated High | Tax Code Provision |
Service Van / Vehicle (1-2 vans) | $12,000 | $82,000 | IRC §179(a)3; IRC §168(k)4 Bonus Depreciation |
Specialized Tools & Diagnostic Equipment | $2,500 | $25,000 | IRC §179(a); IRC §168(k) Bonus Depreciation |
Initial Parts & Fixtures Inventory | $3,000 | $7,000 | Cost of Goods / Business Expense |
Licensing, Bonding & Regulatory Fees | $500 | $4,000 | IRC §195(b)5 Startup Deduction |
Business Insurance (General Liability, Workers' Comp) | $2,000 | $5,000/yr | IRC §162(a)6 Ordinary Business Expense |
Office Infrastructure, IT & Software | $1,000 | $12,000 | IRC §179(a); IRC §195(b) |
Marketing & Customer Acquisition (Year 1) | $3,000 | $15,000 | 100% Deductible — IRC §162(a) Business Expense |
Working Capital / Cash Reserve | $10,000 | $50,000+ | Not deductible; operational reserve |
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🔧 Part II: Using the 2026 Tax Code to Reduce Monthly Expenses
The good news for the new plumbing business owner is that the 2026 tax code provides multiple overlapping mechanisms to dramatically reduce taxable income in the first year — and in some cases, wipe it out entirely. Several of these benefits flow from the OBBBA, which made key provisions permanent and expanded others.
Here is a summary of the key provisions:
Table 2: Key 2026 Tax Code Incentives for a New Plumbing Business
Tax Code Provision | What It Covers | 2026 Limit / Rate |
IRC §195(b) — Startup Deduction | Pre-opening costs: licenses, market research, training | $5,000 (phases out above $50,000) |
IRC §179(b) — Immediate Expensing | Equipment, tools, service vehicles, software | $2,500,000+ limit7 |
IRC §168(k) - 100% Bonus Depreciation Qualified Business Income (QBI) Deduction8 | Qualifying property placed in service after Jan. 19, 2025 20% of the net amount of qualified items of income, gain, deduction, and loss | 100% first-year writeoff (permanent) Taxable income is below the threshold ($200,000 single / $400,000 married filing jointly in 2026) |
Vehicle Mileage Deduction9 | Business use of service van while on job calls | $0.725/mile (2026 rate) |
Home Office Deduction10 | Dedicated workspace used for dispatch, bookkeeping | $5/sq ft, up to $1,500 max |
Marketing & Advertising (as ordinary business expenses) | Website, Google ads, vehicle wraps, business cards | 100% deductible |
Depending on the specific form of business (sole proprietorship, limited liability company, partnership, corporation), the combination of IRC §179 expensing and 100% bonus depreciation under IRC §168(k) can provide a plumber who invests in two service vans and specialized plumbing equipment an opportunity to potentially write off the entire cost of those assets in year one, rather than depreciating them over five to seven years under the traditional rules. These deductions will help a disciplined new plumbing business owner reduce his/her effective federal tax burden substantially in the first year of operation.
There’s the scoop, everyone! Thanks for taking time to check out the Tax Clarity Newsletter. If you want to provide any feedback, send an e-mail to [email protected].
Thank you so much — and happy spring!
References (10)
1 Department of Homeland Security, “U.S. Senate Confirms Markwayne Mullin as Secretary of the Department of Homeland Security”, March 24, 2026, accessed March 27, 2026.
2 Financial Models Lab, Plumbing Service Startup Costs: $127K CAPEX, 17 Months to Breakeven, December 26, 2025, accessed March 27, 2026.
3 IRC §179(a), Election to expense certain depreciable business assets - treatment as expenses, accessed March 27, 2026
4 IRC §168(k), Accelerated Cost Recovery System - Special Allowance for Certain Property, accessed March 27, 2026.
5 IRC §195(b), Start-up expenditures - Election to Deduct, accessed March 27, 2026.
6 IRC §162(a), Trade or Business Expenses, accessed March 27, 2026.
7 IRC §179(b), Election to Deduct Certain Business Activities - Limitations, accessed March 27, 2026.
8 IRC §199A, Qualified Business Income, accessed March 27, 2026.
9 Internal Revenue Service, Publication 587 (2025) - Business Use of Your Home, accessed March 27, 2026.
10 Internal Revenue Service, IRS sets 2026 business standard mileage rate at 72.5 cents per mile, up 2.5 cents, accessed March 27, 2026.
DISCLAIMER: The information in this newsletter is derived from public information, provided for education purposes. It is not provided as a financial advisory service and should not be relied upon as such. For advice on a specific tax matter, please consult a tax professional.