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Compliance for merchants & sellers

Compliance for merchants & sellers

ComplianceKaro Team
June 8, 2026
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Compliance for Merchants & Sellers: A Comprehensive Guide for US Business Owners & LLC FoundersIntroduction: Why Compliance Matters for MerchantsFor US business owners and LLC founders, understanding and adhering to compliance requirements is paramount. It safeguards against legal risks, ensures seamless payment processing, upholds business reputation, and helps avoid potential penalties related to taxes and consumer protection.Section 1: Starting Right – Business Formation, Registration, BOI/FinCEN, EIN, and Registered AgentsYour journey begins with proper business registration and entity maintenance. SBA guidance clarifies the distinction between state and federal filing needs, annual reports, franchise taxes, and registered agent requirements. Many companies in the U.S. are now mandated to report beneficial owner information to the Financial Crimes Enforcement Network (FinCEN). If your business operates in multiple states, you might need to form your business in one state and then file for foreign qualification in others where you are active.Section 2: Licenses & Permits – Federal, State, and LocalBeyond initial registration, merchants often require specific federal, state, and local licenses and permits. These vary widely based on industry, location, and business activities. It's crucial to identify and maintain all necessary permits to operate legally.Section 3: Sales Tax & Nexus – Economic Nexus, Marketplace Facilitator Laws, and RegistrationSales tax obligations are a significant area of compliance, particularly with the evolution of economic nexus and marketplace facilitator laws.Economic Nexus: Thresholds for economic nexus vary by state, commonly set at $100,000 in sales or 200 transactions, though some states have different criteria. If your business meets these thresholds in a state, you must register and collect sales tax there.Marketplace Facilitator Laws: In most states, these laws place the responsibility for collecting and remitting sales tax for sales made through online marketplaces (like Amazon or Etsy) directly on the marketplace facilitator. However, sellers remain responsible for sales made through their own non-marketplace channels and often for registration and reporting in many states.State Resources: Authoritative resources like Avalara's state-by-state marketplace facilitator guide, TaxJar's state sales tax pages, and the Federation of Tax Administrators' (FTA) state tax agency links provide direct access to state-specific details and registration portals.Section 4: Payment & Card Acceptance Compliance – PCI DSS Basics, KYB/KYC, Processor Rules, 1099-K ReportingAccepting payments involves adherence to several critical standards:PCI DSS: The Payment Card Industry Data Security Standard applies to all merchants who accept, process, store, or transmit credit card information. It's a framework to ensure the safe handling of cardholder data.KYB/KYC: Card networks and payment processors enforce Know Your Business (KYB) and Know Your Customer (KYC) rules to prevent fraud and illicit activities.1099-K Reporting: The IRS requires reporting of payments received for goods or services via credit/debit cards, payment apps, or online marketplaces on Form 1099-K. While Third Party Settlement Organizations (TPSOs) have a reporting threshold (e.g., $20,000 and 200 transactions), merchants must report all income, even if a 1099-K is not issued.Compliance Risks: Non-compliance can lead to severe consequences, including frozen funds, higher processing fees, account termination, or placement on industry watchlists like MATCH.Section 5: Employment & Payroll Compliance – Hiring Basics, I-9, Withholding, Posters, Workers’ CompFor merchants with employees, federal and state employment laws are critical:Hiring & Withholding: This includes proper I-9 verification, wage withholding, and accurate payroll tax filings with both the IRS and state authorities.Worker Protections: Employers must comply with unemployment insurance and workers’ compensation rules, and display required workplace posters as mandated by the Department of Labor (DOL) and referenced by the SBA.Section 6: Advertising, Returns, and Consumer Protection – FTC Rules, CAN-SPAM, TCPA, INFORM Act, DisclosuresThe Federal Trade Commission (FTC) plays a central role in consumer protection:Truth-in-Advertising: All advertising claims must be truthful, non-deceptive, and evidence-based.Specific Regulations: Merchants must adhere to rules like the Mail Order Rule (for sales by mail, phone, or online), CAN-SPAM (for email marketing), TCPA (for telemarketing), and the INFORM Consumers Act (for marketplace sellers). Clear disclosures and transparent refund/return policies are essential.Section 7: Data Privacy & Website Obligations – CCPA/CPRA Overview, Privacy Policy, ADA ConsiderationsIn the digital age, data privacy and website accessibility are paramount:Data Privacy Laws: Beyond FTC guidance, several states have enacted comprehensive privacy laws, with California's CCPA/CPRA being the most prominent. Merchants selling to or collecting data from residents of these states must comply with specific privacy obligations.Website Accessibility: Businesses with customer-facing websites and digital storefronts should also consider ADA website accessibility guidance to ensure their online presence is usable by all.Section 8: Product Safety & Industry-Specific Rules – CPSC, FDA Notes for Foods/Cosmetics/SupplementsDepending on the products you sell, specific safety and labeling regulations apply:General Product Safety: The Consumer Product Safety Commission (CPSC) oversees general consumer product safety rules.Industry-Specific: The Food and Drug Administration (FDA) regulates foods, drugs, cosmetics, and certain labeling/ingredient requirements. Merchants in these industries must ensure their products meet these specialized compliance standards.Closing: Practical Next Steps, Templates, and ResourcesNavigating this landscape can be complex, but numerous resources are available. Leverage guidance from the SBA, IRS, FTC, PCI Security Standards Council, Avalara, FTA, and TaxJar. Consider implementing practical tools such as a privacy policy checklist, terms & conditions outline, refund & shipping policy examples, sales tax registration checklist, PCI DSS starter checklist, and a merchant onboarding KYB/KYC checklist to streamline your compliance efforts.

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