Invoice
Invoice Generator
AI-powered · Attorney review option · All 50 states
Signature Requirements
No Signature Required
Invoices are billing documents that do not require signatures to be valid. The invoice serves as a formal request for payment and creates a record of the transaction for accounting and tax purposes.
Sample Invoice Generated by Legal Tank
Invoice
Invoice Header
From: [____________] ("Service Provider / Seller"). To: [____________] ("Client / Buyer"). Invoice Number: [____________]. Invoice Date: [____________]. Due Date: [____________]. Payment Terms: [Net 30 / Due Upon Receipt]. PO Number (if applicable): [____________].
Services and Products
Description of Services/Products: [Line Item 1: Description, Quantity, Rate, Amount]; [Line Item 2: Description, Quantity, Rate, Amount]. Service Period: [____________] to [____________]. Subtotal: [$__________].
Tax and Total
Subtotal: [$__________]. Sales Tax ([_____]%): [$__________]. Shipping: [$__________]. Discounts: [$__________]. Total Due: [$__________]. Previous Balance: [$__________]. Payments Received: [$__________]. Balance Due: [$__________].
Payment Instructions
Payment due by [____________]. Methods: [check / wire / ACH / credit card]. Wire: Bank [____________]; Routing [____________]; Account [____________]. Checks payable to [____________].
View all 8 sections
Late Payment
Late fee of [1.5%] per month on outstanding balance. Service Provider reserves the right to suspend services for accounts over [thirty (30)] days past due.
Dispute Process
Disputes must be notified in writing within [fifteen (15)] days of receipt. Undisputed amounts remain due. Parties shall resolve disputes within [thirty (30)] days.
Tax Information
Tax ID: [____________]. Tax-exempt clients must provide valid exemption certificate. This invoice may be used for tax documentation purposes.
Governing Terms
Subject to the agreement between parties dated [____________]. Governed by the laws of the State of [_____________].
What Is a Invoice?
An invoice is a commercial document issued by a seller to a buyer that itemizes goods delivered or services rendered, specifies the amount owed, and requests payment according to defined terms. The invoice serves as both a formal request for payment and a critical business record for accounts receivable tracking, tax reporting, and financial auditing purposes. While an invoice is not a contract in itself, it functions as evidence of an existing agreement between the parties and creates a documented obligation for the buyer to remit payment. Under UCC Article 2, which governs the sale of goods, an invoice confirming the terms of a prior oral agreement can serve as the written memorandum required by the Statute of Frauds for transactions involving goods valued at $500 or more.
The legal significance of an invoice extends beyond a simple payment request. In many jurisdictions, prompt payment acts at both the state and federal level require that invoices submitted to government agencies be paid within a specified number of days, typically 30 to 45 days, with mandatory interest accruing on late payments. The federal Prompt Payment Act (31 U.S.C. Section 3901 et seq.) requires federal agencies to pay commercial invoices within 30 days and to pay interest on late payments at a rate established by the Treasury Department. For private sector transactions, the net payment terms printed on the invoice establish the buyer's obligation to pay within the specified period, and failure to pay within those terms may trigger late payment penalties as stated on the invoice. Invoices should be coordinated with underlying agreements such as a Service agreement generator or purchase order to ensure consistency in pricing, payment terms, and other conditions.
A proforma invoice is an estimated or preliminary invoice provided to the buyer before goods are shipped or services are performed. Unlike a standard invoice, a proforma invoice is not a demand for payment but rather a good-faith estimate of costs that allows the buyer to arrange financing, obtain import licenses, or approve expenditures before the transaction is completed. Commercial invoices are required for international trade and must include specific information such as the Harmonized Tariff code, country of origin, and declared value for customs purposes. Tax invoices are required in jurisdictions that impose value-added tax (VAT) or goods and services tax (GST) and must include the seller's tax identification number, the applicable tax rate, and the tax amount charged. Each type of invoice serves a distinct legal and commercial purpose.
Every invoice should include an invoice number that provides a unique identifier for internal tracking, cross-referencing with purchase orders, and audit trail purposes. Sequential numbering systems are the most common, though some businesses use alphanumeric codes that incorporate date information, client identifiers, or project codes. The IRS requires businesses to maintain records of income, and invoices serve as primary documentation for revenue reporting on tax returns. For independent contractors, invoices document the income reported on Form 1099-NEC and must be retained for at least three years after filing the related tax return. Proper invoicing practices are essential for maintaining accurate financial records, supporting tax positions during audits, and preserving legal rights to collect payment through the courts if necessary. An invoice should align with the terms established in any underlying Independent contractor template or service contract.
| Invoice Type | Purpose | When Used |
|---|---|---|
| Standard Invoice | Request payment for goods or services delivered | After delivery or completion of work |
| Proforma Invoice | Provide an estimated cost before delivery | Before transaction, for approvals or import licenses |
| Commercial Invoice | Document international trade transactions | Required for customs clearance |
| Recurring Invoice | Bill for ongoing services at regular intervals | Monthly retainers, subscriptions |
| Credit Memo | Reduce or reverse a previously issued invoice | Returns, billing errors, adjustments |
Why You Need a Invoice
You are a freelancer or independent contractor who needs to send professional invoices to clients for services rendered, documenting the work performed, the amount owed, and the payment terms for both legal and tax purposes. Start with our free invoice template for a professional, ready-to-use format.
Your small business sells products or services and needs a consistent invoicing system to manage accounts receivable, track outstanding payments, and maintain records for tax filing and potential audits. Our Commercial contract drafting can prepare the underlying agreements that your invoices reference.
You need to create invoices that align with the terms of an underlying Free service agreement or contract, ensuring that the billed amounts, descriptions, and payment terms match the agreed-upon provisions.
You are billing a government agency and must comply with prompt payment act requirements, including specific invoice formatting, submission procedures, and documentation for the payment to be processed within the statutory timeframe.
You need to document income for tax purposes, as invoices serve as primary evidence of revenue for IRS reporting and must be retained as part of your business's financial records. If you work with subcontractors, pair your invoicing system with an Contractor agreement form to formalize the working relationship.
Related Contracts & Agreements Documents
Invoice is often used alongside other contracts & agreements documents. Depending on your situation, you may also need:
Key Sections in a Invoice
Business and Client Information
This section includes the seller's legal business name, address, phone number, email, and tax identification number, alongside the buyer's corresponding information. Accurate identification of both parties is essential for proper recordkeeping, tax reporting, and legal enforceability of the payment obligation.
Invoice Number and Date
The unique invoice number and issue date establish the document's identity within the seller's accounting system. The invoice date typically triggers the start of the payment term period. A consistent numbering system is important for audit trails and prevents duplicate invoices.
Itemized Description of Goods or Services
Each line item includes a description of the good or service provided, the quantity, the unit price, and the total amount for that line item. Detailed descriptions prevent disputes about what was delivered and provide the documentation needed for the buyer's accounts payable processing.
Subtotal, Tax, and Total
This section calculates the subtotal of all line items, applies any applicable sales tax, VAT, or other taxes, and states the total amount due. The tax calculation must comply with the applicable jurisdiction's tax requirements, including the correct rate and the seller's tax collection obligations.
Payment Terms
Payment terms specify when payment is due, acceptable payment methods, and any early payment discounts. Common terms include Net 30 (due within 30 days), Net 60, 2/10 Net 30 (2% discount if paid within 10 days, full amount due in 30), and due upon receipt. These terms establish the buyer's legal obligation to pay by the specified deadline.
Late Payment Provisions
This section specifies the interest rate or flat fee charged on overdue payments, the grace period before penalties apply, and whether attorney fees will be assessed if collection action becomes necessary. Late payment provisions must comply with state laws governing maximum interest rates on commercial debts.
Notes and Special Instructions
The notes section can include special delivery instructions, reference numbers for the buyer's purchase order, project identifiers, bank account details for wire transfers, and any other information relevant to the specific transaction or the ongoing business relationship.
Invoice Legal Requirements
The federal Prompt Payment Act (31 U.S.C. Section 3901 et seq.) requires federal agencies to pay commercial invoices within 30 days of receipt and to pay interest on late payments at the rate established by the Treasury Department.
State prompt payment acts impose similar requirements on state and local government agencies, and many extend prompt payment obligations to private sector transactions involving construction and government contracting.
Under UCC Article 2, an invoice confirming the terms of a prior oral agreement for goods valued at $500 or more can satisfy the Statute of Frauds writing requirement if the receiving party does not object within ten days.
The IRS requires businesses to maintain records of all income and expenses, and invoices serve as primary documentation supporting revenue reported on tax returns, with a minimum retention period of three years from the filing date.
State sales tax laws require sellers to collect and remit applicable sales taxes, and the invoice must separately state the tax amount, the applicable rate, and the seller's tax registration number to comply with reporting requirements.
Common Invoice Mistakes to Avoid
Omitting a unique invoice number, which makes it difficult to track payments, cross-reference with purchase orders, and maintain the audit trail required for IRS recordkeeping and financial reporting.
Failing to specify clear payment terms, leaving the buyer uncertain about when payment is due and depriving the seller of the ability to enforce late payment penalties or interest charges.
Not including applicable sales tax or VAT on the invoice, which can result in the seller being personally liable for uncollected taxes and may trigger penalties during tax audits.
Sending invoices with vague descriptions of goods or services that do not allow the buyer to verify what was delivered, leading to payment disputes and delays.
Not retaining copies of all invoices for the minimum period required by the IRS (at least three years from the date the related tax return was filed), which can create problems during audits.
Frequently Asked Questions About Invoices
What should be included on an invoice?
Is an invoice a legal document?
What is the difference between an invoice and a receipt?
What are net payment terms?
Can you charge interest on unpaid invoices?
What is a proforma invoice?
How do you write a professional invoice?
What is an invoice number?
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