How to Start an Online Store Legally in 2026 (LLC, Sales Tax & Policies)
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Getting a storefront live takes an afternoon. Getting it legal takes a checklist, and most first-time sellers never see the whole list in one place: the entity decision, the EIN, the seller’s permits, the policies your payment processor demands, and two federal rules most guides have not caught up with. Skip the foundation and you can still make sales, right up until a processor freezes the account for a missing policy, a state sends a sales-tax notice, or a customer dispute lands on you personally because no company stood in between. This guide walks the launch in order, with the fees and rules verified rather than guessed.
The short version (2026):
- Five layers make a store legal: business structure, registrations (EIN, licenses), sales tax, site policies, and books. Do them in that order.
- Sales tax follows nexus: register in your home state, watch the ~$100,000 economic-nexus thresholds elsewhere, and let the platform calculate; marketplaces collect for marketplace sales.
- Your processor and ad networks require policies (privacy, terms, refunds) regardless of your size, and a cookie banner usually follows.
- Two federal rules sellers miss: the FTC’s fake-review rule (civil penalties over $50,000 per violation) and the INFORM Consumers Act for high-volume marketplace sellers.
The Legal Side of an Online Store: The Five Layers
Building the store is the visible work; the legal foundation is what keeps it standing. Five layers, in launch order:
- Business structure: sole proprietor or LLC, decided honestly by risk.
- Registrations and tax IDs: the entity filing, the EIN, and any local licenses.
- Sales tax: permits where you have “nexus,” a legal connection to a state.
- Store policies: terms, privacy, refunds, shipping, and cookie consent.
- Bookkeeping: income and expenses tracked from the first sale, not the first audit.
You do not need all five finished before your first sale, but every layer you defer is a known bill arriving later. Take them in turn.
Step 1: Choose the Business Structure
| Sole Proprietor | LLC | |
|---|---|---|
| Setup | Automatic; you sell, therefore you are one | File Articles of Organization with your state |
| Liability | Personal assets exposed | Personal assets generally protected |
| Cost | $0 | State filing fee, plus optional registered agent |
| Best for | Testing an idea, small side income | Real inventory, real revenue, real risk |
A sole proprietorship is the default: start selling without forming anything and that is what you are, with no separation between business debts and your savings account. An LLC creates that separation for a modest state fee, and for stores past the experiment stage it is the standard answer: liability protection, a cleaner face for suppliers and processors, and pass-through taxes. The full decision framework is in our sole proprietorship vs. LLC comparison, the filing itself in the LLC formation walkthrough, and if you started selling first and are upgrading now, the conversion guide linked from both covers moving an existing operation in.
A common, sensible path: validate the idea as a sole proprietor, form the LLC when orders become consistent, and never let the switch lag behind your first real inventory order or supplier contract.
Step 2: Register, Get the EIN, and Check Licenses
- Form the entity (if LLC): Articles of Organization plus a registered agent. Fees vary by state; the formation cost calculator shows yours.
- Get the EIN, free, from the IRS directly. The IRS’s own application takes minutes and costs nothing; paid “EIN filing services” resell a free government form. Details and traps in the EIN guide.
- Open a business bank account. The separation is what makes the LLC shield real and the bookkeeping sane.
- Check local licensing. Many cities want a general business license even for a home-run store, and home-based sellers may need a home occupation permit; the business license guide walks the federal-state-local stack.
Step 3: Sales Tax and Nexus, Without the Panic
Since the Supreme Court’s 2018 South Dakota v. Wayfair decision, a state can require you to collect its sales tax once you have economic nexus there, meaning enough sales into the state, commonly around $100,000 a year (thresholds vary), with no physical presence needed. The working rules:
- Home state first. You always have nexus where you operate; register for the seller’s permit there before the first taxable sale. It is $0 in most states, California and Texas verified, and the state-by-state walkthrough is in the seller’s permit guide.
- Marketplaces collect for marketplace sales. Every sales-tax state now has a marketplace-facilitator law, so Amazon or Etsy collects on those orders; sales through your own checkout remain your job.
- Watch the thresholds as you grow. Track sales by state; register when you cross a line, not before and not two years after.
- Let the platform do the math. Once registered, your e-commerce platform calculates and collects per-jurisdiction rates; you file and remit on each state’s schedule, including $0 returns where required.
Two mistakes to avoid in both directions: collecting tax in states where you never registered (that is holding tax money without an account to remit it to) and ignoring a state where you clearly crossed the threshold.
Step 4: The Policies Your Store Actually Needs
Customers, payment processors, ad platforms, and privacy laws all expect a policy stack, and each document has a different job:
- Terms of Service: the purchase rules: ordering, pricing errors, liability limits, disputes.
- Privacy Policy: required once you collect customer data (you do), by roughly twenty state privacy laws where they apply and by processors and ad networks at any size.
- Refund/Return Policy: your chargeback insurance; clear terms cut disputes more than any other page. Our refund policy template covers the state notice rules.
- Shipping Policy: processing times, carriers, regions.
- Cookie consent: if analytics or ad pixels run (they do), see the cookie consent guide for the banner and the twelve-state GPC rule.
These pages convert as well as they protect: they are exactly what a first-time customer scans before trusting a new store with a card number.
Generate the store’s policy stack from your actual practices: Termly builds the Privacy Policy, Terms, Refund Policy, and cookie banner, and keeps them current as state privacy laws change.
The Two Federal Rules Online Sellers Miss
Two newer federal rules now sit alongside the classic FTC advertising basics, and both reach small sellers:
- The fake-review rule. Since October 21, 2024, the FTC’s Consumer Reviews and Testimonials Rule bans buying or selling fake reviews, paying for positive (or negative) ones, undisclosed insider reviews from your employees or relatives, fake “independent” review sites you control, and suppressing honest negative reviews, with civil penalties that currently run over $50,000 per violation. Incentivized reviews need disclosure; review-gating (“only happy customers get the review link”) is squarely targeted.
- The INFORM Consumers Act. Selling at volume through marketplaces (200+ transactions and $5,000+ in a year), expect the platform to collect and verify your bank, tax ID, and contact details, and to disclose seller identity to buyers; it is a federal requirement on the marketplaces, not optional paperwork.
Neither rule is a reason for panic; both are reasons to run reviews and marketplace accounts straight, because the enforcement examples so far are exactly the shortcuts small stores are tempted by.
Step 5: Build the Store Itself
With the legal scaffolding decided, the build is the fun part: products, checkout, payments, shipping rules, and the policy pages linked in the footer and at checkout. A hosted platform handles the load-bearing technical compliance, SSL, PCI-scope payment processing, and per-jurisdiction tax calculation, so the legal work you did in steps 1-4 plugs into settings screens instead of custom code. Before announcing, run one real end-to-end test order: payment, tax line, confirmation email, and a refund, so the first stranger’s order is not the first test.
Ready to build? Shopify handles hosting, checkout, payments, and sales-tax calculation in one place, so the storefront work starts from solved problems.
Step 6: Books Before the Sales Start
The fastest way to ruin a profitable first year is to reconstruct it in April. From the first sale, run everything through the business account and track the deductions as they happen: platform fees, payment processing, shipping and packaging, inventory, software, home-office costs. As a seller you will likely owe self-employment tax and quarterly estimated payments, which are calendar problems only if nobody is watching the numbers.
A spreadsheet works for the first quiet weeks; after that, connect the account to a tool that categorizes expenses and flags write-offs automatically, so tax season is a review, not an archaeology dig.
Once the sales start, the taxes start. Keeper tracks the business expenses and finds the write-offs automatically, so the first tax season is boring, which is the goal.
Common Mistakes When Starting an Online Store
- Mixing personal and business money. It erodes the LLC shield and wrecks the books; open the separate account on day one.
- Ignoring sales tax until a state writes first. Register at home immediately; track thresholds elsewhere.
- Launching with no policies. Processors freeze accounts over it, and ad platforms reject campaigns without a privacy policy.
- Buying or gating reviews. A five-figure-per-violation federal rule now covers what used to feel like growth hacking.
- Forming the LLC after the problem. Protection is not retroactive; form before the risk scales.
- Untracked finances. Missed deductions are a silent tax on the whole year.
When to Bring in a Professional
Good tools and guides cover the standard launch. Bring in a CPA once revenue is meaningful, inventory accounting appears, or multi-state sales tax gets real; bring in an attorney for partners, investors, regulated products (supplements, CBD, alcohol), or a serious dispute. The efficient pattern: DIY the launch stack with verified sources, buy expertise where the facts stop being standard.
Frequently Asked Questions
Do I need an LLC to start an online store?
No; you can legally sell as a sole proprietor. The LLC earns its fee when real money and risk arrive: it separates business liabilities from your personal assets, reads as more professional to suppliers and processors, and costs a modest state filing fee. Many sellers validate first, then form.
Do I have to collect sales tax?
In your home state, yes, once you sell taxable goods, register for the (usually free) seller’s permit first. In other states, only after you cross their economic-nexus thresholds, commonly around $100,000 in annual sales. Marketplace platforms collect for marketplace orders; your own checkout is your responsibility.
What legal policies does an online store need?
Terms of Service, a Privacy Policy (required by processors, ad platforms, and roughly twenty state privacy laws where they apply), a Refund/Return Policy, a Shipping Policy, and in most real configurations a cookie consent banner. They double as trust signals at checkout.
Can I pay for positive reviews if I disclose it?
Paying for a positive review is banned outright under the FTC’s 2024 rule; disclosure does not cure it. Incentivized honest reviews require clear disclosure, insiders must identify themselves, and suppressing negative reviews is its own violation, at penalties currently over $50,000 each.
How much does it cost to start an online store legally?
Lean but real: platform subscription and processing fees, a domain, the LLC filing fee if you form one (plus optional registered agent), a usually-free seller’s permit, and policy generation. Most sellers can stand the full legal stack up for a few hundred dollars, then reinvest revenue.
Can I run it from home?
Yes, most stores start there. Check three things: whether your city wants a general license or home occupation permit, whether a lease or HOA restricts business use, and that your tax registrations list the real address. Legally, the structure and policies matter far more than the location.
The Bottom Line
A legal online store is five deliberate layers: an entity matched to your actual risk, the free EIN and the local licenses, seller’s permits where nexus exists, a policy stack your processor and the privacy laws expect, and books that start with sale one. Add the two newer federal rules, no bought or gated reviews, and INFORM verification if you sell at volume on marketplaces, and the compliance work fits in a launch week. Do it in order, keep the confirmations, and the store you build is one a state notice or a processor review cannot knock over.
Sources & References
This guide is fact-checked against the following official and authoritative sources:
- FTC — Consumer Reviews and Testimonials Rule Q&A
- Cornell LII — South Dakota v. Wayfair
- SBA — Apply for Licenses and Permits
- California CDTFA — Seller's Permit FAQ
Fact-checked: July 2026 · ClearLegalTips editorial team. This is legal information, not legal advice.
David Miller writes about small business and LLC formation for ClearLegalTips. He focuses on making business registration, S-corp elections, and seller’s permits understandable for new founders handling them without a lawyer.
