Amazon will happily let you sell as an individual with your Social Security number. So the LLC question is not about permission; it is about what happens when something goes wrong, and about setting up the structure your taxes will eventually want. The honest answer for most sellers: form the LLC for protection once real money flows, and stop expecting it to lower your tax bill by itself.
Product liability is the real reason
Selling physical goods carries a risk most service businesses never face: the product itself can hurt someone. A supplement with a bad batch, a charger that overheats, a toy with a loose part. Third-party sellers are frequently the first target when a customer is injured, and if you sell as a sole proprietor, a judgment can reach your house, car, and savings. An LLC, kept properly separate with its own bank account and its own Amazon seller account, generally limits the damage to what the business owns.
The LLC also cleans up practical matters: a business bank account, an EIN instead of your SSN on tax forms, wholesale accounts with suppliers, and a brand entity for Amazon Brand Registry. Pair it with product liability insurance, which Amazon itself requires once monthly sales cross the threshold set in its seller agreement; the LLC and the policy protect you in different ways and you want both.
Taxes do not change on day one
Here is what the LLC does not do. A single-member LLC is a disregarded entity: the IRS taxes you exactly as before. Profit lands on Schedule C, flows to your 1040, and bears both income tax and 15.3% self-employment tax up to the Social Security wage base, with the Medicare portion continuing above it. Same forms, same rates, same quarterly estimated payments on Form 1040-ES. Anyone promising that "an LLC unlocks write-offs" is selling paperwork; every legitimate deduction available to an LLC is equally available to a sole proprietor with clean books.
There is one modest tax-adjacent benefit: separation. An LLC with its own bank account forces the discipline of separate books, which means fewer missed deductions and a cleaner audit story. That is real value, just not a rate change.
When the S corp election starts to pay
The LLC becomes a tax tool later, because it is the chassis for an S corporation election. Once net profit is consistently strong, commonly the point where profit clears what a reasonable salary for the work would be, an LLC can file Form 2553 and be taxed as an S corp. You then pay yourself a reasonable W-2 salary, and remaining profit distributions escape the 15.3% self-employment tax. The election adds payroll runs, a separate Form 1120-S return, and state costs, so it only pays above a real profit level; modeled properly, it is often the first meaningful tax structure decision an Amazon seller makes. Forming the LLC now keeps that door open with a single form.