Is this invoice generator really free?

Yes. There's no account, no watermark, and no limit. Cadus makes money from its Pro app plan, not from this tool.

Is my information saved?

No. The invoice is built in your browser and nothing you type is sent to Cadus, so download the PDF before you leave the page.

Can I make an estimate with this?

Yes. Switch the document type to Estimate at the top of the form.

Do I need to charge sales tax on my invoice?

It depends on your state and what you sell. Check with your state's revenue department. The tool applies only the rate you enter.

Free invoice tool

Free invoice generator

Fill in your details and line items, then download a clean PDF to send your client. No account needed, and nothing you type leaves your browser.

Free online tool

Free Invoice Generator

The IRS lists invoices among the documents that show your gross receipts, so keep a copy of each one you send.

Document type

InvoiceEstimate

FromBill to

Invoice numberDateDue date

DescriptionQuantityUnit price

$100.00

DescriptionQuantityUnit price

$0.00

Notes or payment termsSales tax rate (%)

Subtotal: $100.00
Sales tax: $0.00
Total: $100.00

Send invoices and track payment in Cadus, free

This is built in your browser. Nothing you type is sent to Cadus or saved, so download the PDF before you leave.

Before you rely on it

Check whether your state requires sales tax on what you sell. This tool applies only the rate you enter.

Your invoice isn't saved here, so download the PDF before leaving the page.

What to include on an invoice

A good invoice answers every question your client's bookkeeper might have.

What a complete invoice should show
Detail	Why it's there
Your business name and contact details	So the client knows who's billing them and how to reach you
The client's name and address	So it reaches the right person and matches their records
A unique invoice number	So you and your client can refer to it and spot a missing one
Invoice date and due date	So it's clear when payment is expected
Each item, with quantity and price	So the client can check what they're paying for
Sales tax, if you charge it	So the tax is shown separately from your price
How to pay	So nothing stands between the client and paying you

Invoice, estimate, or receipt?

An estimate is sent before the work and says what it should cost. An invoice is sent when payment is due. A receipt confirms that you've been paid. You can switch between an invoice and an estimate with the toggle above.

Payment terms, explained

Net 15 and Net 30 mean payment is due 15 or 30 days after the invoice date. Due on receipt means right away. Shorter terms generally get you paid sooner, so choose the shortest your clients will accept.

What this tool uses

Line totals and tax are figured in whole cents, so the math on the page matches the PDF.

The PDF is built in your browser. Nothing you type is sent to Cadus.

There's no watermark and no limit on how many you make.

Best for

Freelancers and side businesses sending an occasional invoice.

Anyone who needs a PDF right now and doesn't want an account.

New businesses that haven't picked invoicing software yet.

How to use the estimate

Add your details

Enter your business, your client, an invoice number, and the dates.

List the work

Add a line for each service or item, with its quantity and price. Enter a sales tax rate if you charge one.

Download and send

Save the PDF and email it to your client. Keep a copy for your records.

Why Cadus helps after the calculator

Estimates are useful, but records win tax season

A PDF gets the invoice out the door, but you still have to chase it and record it. Cadus's Free plan includes unlimited invoices, with payment status and income next to your expenses.

Download Cadus

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