Guide for US Sole Proprietors
A plain-English guide to invoicing as a sole proprietor — what to include, when sales tax applies, and how to get paid without an accountant on speed dial.
Updated June 2026 · General guidance — not tax advice
Invoice under your own name — no state business registration is required just to be a sole proprietor. Include the date, description of services, total amount, and your payment details. Add a sales tax line only if you have nexus in the state and your work is taxable there.
There's no single national threshold the way a VAT or GST system has one. Whether you charge sales tax depends on nexus (a business connection to a state) and whether that state taxes your type of work at all.
| Situation | Sales tax? | Invoice type |
|---|---|---|
| Service-only, no nexus | No | Standard invoice — no tax line |
| Nexus + taxable work | Yes — collect and remit | Invoice with sales tax shown separately |
| Unsure | Check first | Ask your state Dept. of Revenue |
Many service-based sole proprietors — consultants, designers, cleaners, and similar — never need to charge sales tax, because either their state doesn't tax pure services or they don't have nexus outside their home state. Contractors selling materials alongside labour are more likely to owe tax on at least the materials portion.
Never collect sales tax before you're registered with your state — collecting tax without a permit is a compliance problem. If you're not required to charge tax, just omit any tax line from your invoice.
Here's what a standard invoice looks like for a sole proprietor whose service work isn't taxable:
| Description | Total |
|---|---|
| House clean — 22 Beech Road (3 hrs) | $165.00 |
| Window cleaning — interior and exterior | $75.00 |
Notice — no sales tax line and no seller's permit number. This is correct for a sole proprietor whose work isn't taxable in their state.
Common question
Generally, no. A sole proprietorship is the default legal structure the moment you start doing business under your own name — there's no state filing required just to invoice clients, unlike forming an LLC or corporation.
If you want to trade under a name other than your own legal name (e.g. "Whitfield Cleaning" instead of "Sarah Whitfield"), most states or counties require a DBA ("doing business as") filing, sometimes called a fictitious business name registration. Some cities and states also require a general business license regardless of your entity type — this varies a lot by location, so check your city and state requirements.
Most sole proprietors can simply use their Social Security Number for tax purposes. You can also apply for a free Employer Identification Number (EIN) from the IRS if you'd rather not share your SSN with clients, or once you plan to hire employees. Business income and expenses are generally reported on Schedule C of your personal Form 1040, and net earnings are also subject to self-employment tax.
Only once you have nexus in a taxing state and your work is taxable there. If that applies, you'll generally register for a seller's permit with that state's Department of Revenue before you start collecting tax — see our Sales Tax Invoice Guide for the full picture.
Common questions
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This guide is general information for US sole proprietors and is updated periodically. It is not legal or tax advice. For advice specific to your situation, speak to your accountant or check your state's Secretary of State and Department of Revenue websites.