NAICS 2022 nationalIndustry * USA Verified: Census NAICS 2022 · 2023-03-17
541380
NAICS 541380 — Testing Laboratories and Services
Testing Laboratories and Services
NAICS 541380 is the national industry code for testing laboratories and services establishments in the United States. The Small Business Administration sets a size standard of $19.0 for this classification. It forms part of the hierarchical North American Industry Classification System maintained by the Census Bureau.
SBA: $19.0
View full SBA standard
Official data
| Feature | Description |
|---|---|
| Official name | North American Industry Classification System (NAICS) 2022 |
| Issuing authority | U.S. Census Bureau with OMB, Statistics Canada, and INEGI |
| Tax authority | Internal Revenue Service (IRS) |
| Purpose | Statistical business classification and federal contracting (SAM.gov, SBA standards) |
| Used in | SAM.gov registration, SBA size determinations, IRS tax classification, SEC EDGAR (via SIC crosswalk) |
| Active since | 2022 (current edition) |
| Hierarchy level | Sector (2-digit) |
| Source | https://www.census.gov/naics/ |
When do you need NAICS 541380?
1 Registering on SAM.gov for federal contracting — enter NAICS 541380 as your primary industry code.
2 Checking whether the SBA size standard for testing laboratories and services applies to your business for set-aside contracts or loans.
3 Classifying your main line of business when applying for grants, contracts, loans, or market research surveys.
4 Comparing this code against legacy NAICS 2017 records or related SIC codes for historical data alignment.
NAICS hierarchy path
Trace the classification from the broadest sector down to this national industry code.
Cross-references & crosswalks
SBA size standard description
Testing Laboratories and Services
Changes to receipts-based standard: [object Object]
How to register a testing laboratories and services business in the US
1
Verify NAICS classification
Confirm that Testing Laboratories and Services describes your professional service activity.
2
Register for an EIN (Form SS-4)
Required for most professional service entities operating as LLC or corporation.
IRS EIN application3
Obtain state professional license
Many professional services (legal, accounting, architecture, engineering) require state board licensing — check your specific profession.
4
Register for SAM.gov (if pursuing government contracts)
Professional service firms bidding on federal contracts must maintain an active SAM.gov registration.
US Tax Forms & Registration
| Form Name | Who Files It | Frequency |
|---|---|---|
| Profit or Loss from Business | ||
| U.S. Return of Partnership Income | ||
| U.S. Corporation Income Tax Return | ||
| U.S. Income Tax Return for an S Corporation | ||
| Self-Employment Tax | ||
| Estimated Tax for Individuals | ||
| Application for Employer Identification Number (EIN) | ||
| Entity Classification Election | ||
| Nonemployee Compensation | ||
| Employer's Annual Federal Unemployment (FUTA) Tax Return | ||
| Employer's Quarterly Federal Tax Return | ||
| Request for Taxpayer Identification Number and Certification |
Entity Comparison
$
No federal sales tax in the United States. Sales tax is imposed at state and local levels, ranging from 0% to 10.25%. Economic nexus thresholds (following South Dakota v. Wayfair) require out-of-state sellers to collect sales tax once they exceed a state's revenue or transaction threshold, typically $100,000 in sales or 200 transactions per year.
No state income tax: Alaska (AK), Florida (FL), Nevada (NV), New Hampshire (NH), South Dakota (SD), Tennessee (TN), Texas (TX), Washington (WA), Wyoming (WY)
Who uses this code?
Public Relations Agency Owner
Runs a boutique PR firm securing media coverage, managing crisis communications, and building brand reputation.
Licenses
- ●Business license
- ●Client representation agreements
Tax Forms
- ●Form 1065 or 1120-S
- ●Form 940 (FUTA)
- ●Form 941
Real Estate Agent
Represents buyers and sellers in residential and commercial real estate transactions as an independent agent.
Licenses
- ●State real estate license
- ●Brokerage affiliation
- ●E&O insurance
Tax Forms
- ●Schedule C (Form 1040)
- ●Schedule SE (Form 1040)
- ●Form 1099-NEC (commissions)
Licensed Architect
Designs residential and commercial buildings, prepares construction documents, and manages permit approvals.
Licenses
- ●State architect license (NCARB)
- ●Professional liability insurance
- ●Business registration
Tax Forms
- ●Schedule C or 1120-S (PA/PLLC)
- ●Schedule SE
Law Firm Owner
Runs a small law practice specializing in business law, family law, estate planning, or personal injury.
Licenses
- ●State bar admission
- ●Professional corporation (PC) registration
- ●Malpractice insurance
- ●IOLTA trust account
Tax Forms
- ●Form 1065 or 1120-S (PC)
- ●Form 940 (FUTA)
- ●Form 941
Frequently asked questions
- What is NAICS 541380?
- NAICS 541380 is the North American Industry Classification System code for Testing Laboratories and Services. It classifies this business activity for statistical, regulatory, and government procurement purposes. Federal agencies use NAICS codes to collect and publish data about the US economy, determine SBA size standards, and set aside contracts for small businesses.
- What licenses and permits does a Testing Laboratories and Services need?
- A Testing Laboratories and Services typically needs a local business license, a federal EIN from the IRS, and industry-specific permits depending on the sector. Check with your city or county clerk for a general business license, your state's professional or industry licensing board for any required occupational licenses, and your state's tax authority for a sales tax permit if you sell taxable goods or services.
- How do I register a Testing Laboratories and Services business in the United States?
- To register a Testing Laboratories and Services business, first choose your legal structure: sole proprietorship (simplest, uses SSN), LLC (personal liability protection, files with your Secretary of State), or corporation (Form 1120 or 1120-S). Register your business name (DBA) with your county if operating under a trade name. Obtain an EIN from the IRS at irs.gov/ein. Register with your state revenue department for any applicable taxes.
- What tax forms does a Testing Laboratories and Services file with the IRS?
- Tax forms depend on your entity type. A sole proprietor files Schedule C with Form 1040 and Schedule SE for self-employment tax (15.3%). An LLC taxed as a partnership files Form 1065 with Schedule K-1s. A C-Corporation files Form 1120 (21% flat rate). An S-Corporation files Form 1120-S. All businesses paying employees file Form 940 (FUTA) annually and Form 941 quarterly. Estimated tax payments are made via Form 1040-ES four times per year.
- Is Testing Laboratories and Services the right NAICS code for my business?
- Your NAICS code should reflect your primary business activity — the one generating the most revenue or value. If Testing Laboratories and Services describes your main line of business, NAICS 541380 is likely correct. If you have multiple distinct activities, you may need separate codes for statistical reporting. For federal contracting, your SAM.gov registration should use the code that best matches the work you perform. Review the official NAICS 541380 description and exclusions to confirm it fits your operations.
- How does a Testing Laboratories and Services maintain client confidentiality and data security?
- Professional ethical duties of confidentiality apply on top of legal privacy requirements. Lawyers: ABA Model Rule 1.6 and attorney-client privilege require safeguarding all information related to client representation, including implementing technical security measures against cyber threats. Healthcare: HIPAA plus state confidentiality laws. Accountants: IRC Section 7216 prohibits unauthorized disclosure of tax return information (criminal penalty). All should use encrypted email, secure file sharing (not regular email for sensitive docs), password policies, MFA, and written information security plans.
- What continuing education (CE/CLE/CPE) does a Testing Laboratories and Services need?
- Most licensed professions require continuing education. Lawyers: typically 12-15 CLE hours annually including ethics/professionalism credits (state bar requirement). CPAs: CPE hours range from 40-80 per 2-year period plus ethics (AICPA/NASBA standards). Real estate agents: 12-45 hours each renewal cycle (state-specific). Insurance producers: 24 CE biennially (3 hours ethics). Architects and engineers: 12-24 hours annually. Managing brokers have additional CE. Courses must be from approved providers. Carryover limits apply — track carefully to avoid late renewal.
- Does a Testing Laboratories and Services need to register as a foreign entity to work across state lines?
- Professional services delivered across state lines create both entity registration and individual licensing questions. If your professional entity (LLC, PC) has a physical presence, employees, or 'doing business' in another state, you typically must register as a foreign entity with that state's Secretary of State. Independent professionals providing occasional multi-state services often are individually licensed in each state but may not formally register their entity. Remote work considerations: post-COVID, many states take the position that providing professional services to residents of their state from outside creates a jurisdictional nexus requiring individual licensure.
- Does a Testing Laboratories and Services need a professional license or state board registration?
- Many professional services — including lawyers, architects, engineers, accountants (CPA), real estate agents, insurance producers, landscape architects, and surveyors — require state licensing with education, exam, experience requirements, and ongoing continuing education. Operating without a required license can result in cease-and-desist orders, fines, and criminal charges. Even unlicensed professions should check for 'right to practice' laws. For example, some states restrict 'interior designer' title to licensed professionals.