How to Invoice Someone When You Are Self-Employed

You do not need a registered company, a business bank account or an accountant to send an invoice. In the US a sole proprietor can invoice under their own name from day one. What trips people up is not the document — it is the tax identity behind it and the share of each payment that was never really theirs.

You can invoice without a company

If you are working for yourself and have not registered anything, you are a sole proprietor by default. That is a real, legal way to do business in the US, and it means you can send an invoice today under your own legal name. There is no registration step that has to happen first, no minimum, and no requirement to have an LLC.

You can also trade under a business name if you prefer — that is a DBA, "doing business as", registered cheaply with your county or state. It is worth doing if you want a business bank account in that name or simply want the invoice to look like a business rather than a person. What matters on the invoice itself is that your legal name appears, because that is the name your client's records and your tax documents will use. Invoicing purely as "Bright Ideas Studio" when the client set you up as Jane Doe is one of the more common causes of a payment quietly stalling.

There is likewise no legally required invoice format in the US. No government body issues invoice numbers, approves layouts, or requires a stamp. An invoice is a business document, and the standard it has to meet is practical: can your client approve and pay it without asking you anything, and can you prove a year from now what it was for and whether it was paid.

What a self-employed invoice has to contain

Your legal name and contact details, the client, a date, a unique invoice number, a clear description of the work, the amount, and how and when you want to be paid. That is the whole list, and everything on it exists because leaving it out costs you something specific.

The invoice number is the one people skip and the one that matters most later. It is what connects a payment in your bank to a piece of work, and without it you cannot answer "did they ever pay for the March job?" except by memory. A plain sequence is enough. Never reuse a number, including on a corrected invoice — issue a new one instead.

The description should use the client's words, not yours. You know it as "the API refactor"; they approved "fixing the slow checkout". The person releasing the payment is frequently not the person who hired you, and they are matching your description against something they have on file. A description they cannot match is a question, and a question is a week.

Payment terms mean writing both the term and the actual date — "Net 30, due 16 October". And say how to pay you. A surprising share of late payment from small clients is simply that they did not have your bank details and did not want to ask twice.

Get an EIN so you are not emailing your SSN

A US client who pays you as a contractor needs a taxpayer identification number from you, collected on a Form W-9, so they can file a 1099 at the end of the year. For a sole proprietor that number can be your Social Security number — or it can be an EIN, an Employer Identification Number, which the IRS issues to you free in about ten minutes online even if you have no employees and no company.

Get the EIN. It does exactly the same job on a W-9, and it means your Social Security number is not sitting in the inboxes and vendor systems of every client you have ever worked for. This is the single highest-value ten minutes in setting yourself up as self-employed, and most people only learn about it after they have already sent their SSN to six companies.

The direction of these documents is worth fixing in your head, because it is a common muddle. You send the client a W-9 — it carries your name, address and tax number, and it goes to them before or with your first invoice. They send you a 1099 the following January, reporting what they paid you, and they file a copy with the IRS. You do not issue the 1099 and you do not need to receive one in order to owe tax on the income.

That last point catches people. Income is taxable whether or not a 1099 arrives. Clients below the reporting threshold do not have to send one, and the threshold changed for payments made from 2026, so do not rely on a figure you half-remember or on a form showing up. Your own invoice records are what you report from, and they should match your bank.

Part of every payment was never yours

This is the part that makes a first year as a sole proprietor unpleasant. When you were an employee, tax came out before the money reached you. Self-employed, the full invoice amount lands in your account and looks like yours, and some of it is not.

You owe self-employment tax — Social Security and Medicare, 15.3% — on your net profit, calculated on 92.35% of it rather than the whole amount. That is on top of ordinary income tax. And because nobody is withholding, the IRS expects you to pay in four quarterly instalments rather than a lump sum in April; missing them can mean an underpayment penalty even if you pay the full amount later.

The practical version is simple: when an invoice is paid, move a share of it out of sight before you look at the balance. A common rule of thumb is 25% to 30% of profit, which covers self-employment tax and leaves something toward income tax, though your actual rate depends on your total income and state. The worked example below puts real numbers on one invoice so the size of the gap is visible.

One thing that does reduce it: legitimate business expenses come off your profit before self-employment tax is calculated, so the record-keeping is not only for the IRS. Software, equipment, mileage, a home office — each one lowers the figure the 15.3% is applied to. Freelancers who do not track expenses routinely pay tax on revenue they never really earned.

Keeping records when there is no accounting department

As a sole proprietor your invoices are the primary record of your income. There is nobody behind you reconciling anything, and the IRS expects records supporting what you reported to be kept for at least three years.

Most sole proprietors are on the cash basis, which means income counts when you are paid, not when you invoice. That has a consequence people find surprising: an invoice a client never pays is not a deductible bad debt, because you never reported it as income in the first place. There is nothing to write off — the loss is your unpaid time.

Keep the file you actually sent, not just the template you generated it from. A template you have since edited is not evidence of what went out in March. And keep a running list, however crude, of invoice number, client, amount, date sent and date paid. A spreadsheet is enough at low volume, and it is the thing that turns "I think they paid" into a fact.

Example

A self-employed copywriter sends her first substantial invoice: $5,900.00 for a month of work, paid in full. She has an EIN rather than giving out her SSN, and she has $1,475.00 of tracked business expenses for the period — software, a laptop share and mileage.

Invoice paid	$5,900.00
Less tracked business expenses	−$1,475.00
Net profit this period	$4,425.00
Subject to self-employment tax — 92.35% of profit	$4,086.49
Self-employment tax — 15.3%	$625.23
Plus income tax at her bracket, paid quarterly	separate — see the calculator

Of the $5,900.00 that landed, roughly $625 is self-employment tax alone — before any income tax.

The first number to sit with is that $5,900.00 arrived and it is not $5,900.00 of income. It is revenue. Profit is what is left after expenses, and tax is calculated on profit — which is why the $1,475.00 of tracked expenses is not bookkeeping tidiness but money. Untracked, her profit would be $5,900.00 and her self-employment tax roughly $833 instead of $625. Those receipts were worth about $208.

The 92.35% step is not a rounding convention. Self-employment tax is charged on 92.35% of net profit, which is the rough equivalent of the employer half that a salaried person never sees. It is the closest thing to good news in the calculation, and it applies automatically — you do not have to claim it.

The 15.3% is Social Security and Medicare combined, and it is a flat rate on that base up to the Social Security wage cap. Unlike income tax it does not start at zero and step up through brackets, which is why the first year is such a shock: it applies from the first dollar of profit.

Income tax sits on top and depends on her total income, filing status and state, so it is not a single number anyone can give her from one invoice. The self-employment tax calculator on this site works it through properly, and the quarterly calculator turns the annual figure into the four payments the IRS actually expects.

The habit that makes all of this survivable is moving a share out the day an invoice is paid. Whether the right share is 25% or 30% depends on her bracket, but the alternative — leaving it in the current account and settling up in April — is how sole proprietors end up owing a number they have already spent.

Frequently asked questions

Can I invoice someone if I am not a registered company?: Yes. If you work for yourself and have registered nothing, you are a sole proprietor by default, which is a legal way to do business in the US. You can invoice under your own legal name immediately. An LLC, a DBA and a business bank account are all optional and none of them is a prerequisite for sending an invoice or being paid.
Do I have to put my SSN on the invoice?: No. Your tax number goes on a Form W-9 that you send the client separately, not on every invoice. And it does not have to be your SSN — apply for an EIN from the IRS, which is free, takes about ten minutes online and works identically on a W-9 even if you have no employees. It keeps your Social Security number out of client inboxes and vendor systems.
What is the difference between a W-9 and a 1099?: You send the client a W-9 with your name, address and taxpayer number, usually before or with your first invoice. They send you a 1099 the following January reporting what they paid you, and file a copy with the IRS. The direction is easy to muddle. You never issue the 1099, and you owe tax on the income whether or not one arrives.
How much should I set aside from each invoice?: A common rule of thumb is 25% to 30% of profit — enough to cover self-employment tax at 15.3% with something toward income tax. Your real figure depends on total income, filing status and state. The important part is moving it out the day you are paid rather than deciding in April, because by then it has usually been spent.
Do I need to charge sales tax on my services?: Usually not on professional services, but it varies by state and by what you sell — several states tax specific categories such as software, digital products and some design or data services. If what you provide could be read as a product rather than a service, confirm with a state-qualified accountant rather than assuming.
What if a client never pays the invoice?: Work the escalation ladder — check first whether it was actually received and matched, pause remaining work at a point you decided in advance, then send a formal written demand. One thing to know early: on the cash basis most sole proprietors use, an unpaid invoice is not a deductible bad debt, because you never reported it as income. The loss is the unpaid time, not a write-off.

Disclaimer. This guide describes general US practice for sole proprietors and is not tax or legal advice. Self-employment tax rates, quarterly payment rules, 1099 reporting thresholds and state sales tax obligations change and vary by situation. Confirm anything carrying real money with a qualified accountant.