Can an invoice be signed electronically?

Yes. Electronic signatures are legally enforceable under the federal ESIGN Act (15 U.S.C. ch. 96, 2000) and UETA in most states if intent, consent, attribution, and record retention are satisfied.

When is a paper signature still required?

Certain exceptions exist for wills, court orders, and other specified documents. For invoices, paper signatures are rarely required unless a contract or buyer explicitly demands them.

What happens if the invoice has the wrong tax ID?

An incorrect TIN can trigger backup withholding (24%) and may require corrected returns. Correct the invoice and provide an accurate W-9 to the payer to avoid withholding.

Do I need to notarize an invoice?

Notarization is uncommon for standard invoices. Notarize only if a contract or local rule requires it for a supporting affidavit or sworn statement.

How long should I keep invoice records?

Follow the longest applicable retention period: IRS minimum of 3 years (IRC §6501(a)), HIPAA six-year rule for healthcare (45 CFR §164.530(j)), and any longer state or contract requirement.

How to reduce payment delays?

Provide clear PO references, exact remittance instructions, an itemized breakdown, and machine-readable invoices or payment links to accelerate AP matching and payment.

Electronic Signature
Templates
Finance
Open Invoice Template

Open Invoice Template

This template is fully customizable. Edit the text, fill out the fields, and send it for signature. Give it a try!

Open Invoice Template

From

Company Name Address Phone Email

Bill To

Client Name Billing Address Contact

Invoice #:

Invoice Date:

Due Date:

Payment Terms: Currency:

Itemized Charges

Description	Quantity	Unit Rate	Amount

Subtotal:

Tax Rate (%):

Tax Amount:

Shipping/Handling:

Total Due:

Payment Instructions

Accepted payment methods: check, ACH, wire transfer, and major credit cards. For ACH or wire transfers, remit to bank account details provided on request. Payment must reference the Invoice # above. Returned payment fee: . Late payments are subject to the late fee set forth below.

Additional Payment Notes

Terms and Conditions

Payment is due in full by the Due Date. Unless otherwise agreed in writing, unpaid amounts shall accrue interest at a rate of 1.5% per month (18% per annum) or the highest rate permitted by applicable law, whichever is lower, calculated monthly from the Due Date until paid. Client will also be liable for all collection costs, including reasonable attorneys' fees and expenses, incurred by the Issuer to collect overdue amounts.

Disputes to charges must be submitted in writing within fifteen (15) calendar days of receipt of this invoice identifying the disputed item and the reason for the dispute. If no timely written dispute is received, the invoice will be deemed accepted by the Client. No setoff or withholding of any amounts due is permitted without prior written consent of the Issuer.

Taxes: The Client is responsible for all sales, use, value-added or other taxes, duties, or levies imposed by any authority relating to the goods or services described herein, unless the Issuer has indicated that such taxes are included. Title to goods remains with the Issuer until full payment is received to the extent permitted by law.

Notes / Special Instructions

Signature (Issuer)

Issued By:

By:

Title:

Date:

What the Open Invoice Template Is and When to Use It

An Open Invoice Template is a standardized billing document used to request payment for goods or services where terms, balances, or schedules may remain open or subject to partial payment. It lists items, quantities, unit prices, taxes, adjustments, and a running balance or outstanding amount. Open invoices are common in B2B billing, ongoing service arrangements, and progress-based projects where multiple invoices against a single contract are expected. The template reduces ambiguity by collecting consistent payment instructions and contact details, which supports reconciliation and dispute resolution.

Why a Clear Open Invoice Template Matters

A clear template reduces payment delays, simplifies accounting reconciliation, and documents the facts needed for collections or dispute resolution while ensuring each invoice meets recordkeeping and tax-reporting obligations.

Who Commonly Creates and Receives Open Invoices

Use role alignment to decide required fields and approval routing to ensure invoices are reviewed before dispatch.

Small businesses and freelancers handling recurring or milestone billing with limited accounting resources.
Mid-market companies using open invoices for ongoing services, retainers, or progress billing.
Enterprise finance teams issuing consolidated or partial invoices tied to long-term contracts.

Key Components Every Professional Open Invoice Template Should Include

A professional invoice groups identification, line-item detail, payment instructions, terms, and reference data so recipients can validate, pay, and reconcile quickly.

Header

Supplier name, logo, address, contact details, and a unique invoice number for tracking and audit purposes to prevent duplicate payments.

Bill To

Customer legal name, billing address, account or purchase order number, and the contact person to ensure correct posting and vendor communication.

Line Items

Description of goods/services, quantity, unit price, taxable status, and subtotal per line so each charge is transparent and auditable.

Totals & Taxes

Subtotal, itemized taxes or fees, discounts, and the final amount due to make the payable amount and tax treatment clear for reporting.

Payment Terms

Due date, acceptable payment methods, late fee policy, and remittance instructions (bank details, ACH routing, or mailing address).

References

Related contract number, project code, work order, or time period to tie the invoice to an agreement or purchase order for faster AP processing.

Required Fields and Essential Data Elements

Invoice Number: Unique alphanumeric ID

Invoice Date: MM/DD/YYYY format

Due Date: MM/DD/YYYY format

Line Details: Quantity, unit price

Tax Information: Taxable flag, rate

Remittance: Bank or payment info

Step-by-Step: How to Complete an Open Invoice

Follow these steps to create a complete, compliant invoice that your customer can process without clarification requests.

01

Create Header: Add supplier ID and invoice number.
02

Add Recipient: Fill customer name and PO reference.
03

Itemize Charges: List each item or service line.
04

Set Terms: Specify due date and remittance info.

How to Configure an Online Open Invoice Workflow

Set up fields, approval routing, and notifications to automate billing and reduce manual intervention in high-volume environments.

Field	Configuration
Invoice Number Format	Auto-generate sequential ID
Approval Routing	Conditional approver by amount
Notification Rules	Email on issue and overdue
Payment Link	Embed secure payment button

Where to Send and How Payment Flows Typically Work

An invoice moves from issuer to recipient, through approvals if required, then to payment and reconciliation. Map the path to avoid bottlenecks.

Issue: Sender delivers invoice to buyer.
Review: Recipient matches PO and approves.
Payment: Buyer remits via chosen method.
Reconcile: Apply payment and close invoice.

Distribution Channels and Technical Considerations

Ensure attachments are machine-readable and include metadata (invoice number, PO) to enable automated matching and reduce exceptions.

Email Delivery: PDF attachments or secure links
Accounts Payable Portal: Upload to buyer portal
EDI/ERP Integration: Automated posting into ERP

Timelines and Typical Processing Expectations

Know common timing expectations to set terms and manage cash flow: issue promptly, allow time for AP processing, and track aging.

Issue Promptly:

Send within agreed billing window (e.g., monthly)

Standard Terms:

Net 30 or Net 45 are common

Reminders:

First reminder at 7–14 days overdue

Escalation:

Collections start after 30–90 days

Recordkeeping:

Retain copies per retention policy

Common Mistakes to Avoid When Preparing an Open Invoice

Missing or inconsistent invoice numbers that cause duplicate payments or reconciliation failures.
Incorrect or absent purchase order references that lead to rejections by AP departments.
Unclear line-item descriptions that prevent approvers from verifying received goods or services.
Incomplete remittance instructions or incorrect banking details that delay electronic payments.

Risks and Consequences of Inaccurate Invoices

Late Payment: Cash-flow disruption

Backup Withholding: 24% withholding triggers

Tax Audit: Incorrect reporting exposure

Disputed Charges: Longer collections cycle

Contract Breach: Potential remedies

Reputational Impact: Client relationship strain

Comparing eSignature Vendors for Invoicing Workflows

Common vendor features and starting prices for eSignature plans relevant to invoice distribution and signing. signNow is listed first per comparative format.

	signNow	DocuSign	Adobe Sign	PandaDoc	HelloSign
Starting Price	$8/user/mo	$15/user/mo	$14/user/mo	$19/user/mo	$15/user/mo
Free Trial	Yes, 7-day trial	Yes	Yes	Yes	Yes
Bulk Send	Yes	Yes	Yes	Yes	Yes
Audit Trail	Yes	Yes	Yes	Yes	Yes
HIPAA Compliant	Yes	Yes	Yes	No	No

FAQs — Common Questions About Open Invoice Templates

Answers to frequent questions about completion, legal validity, e-signature use, and recordkeeping for open invoices.

Need help? Contact support

Can an invoice be signed electronically?
Yes. Electronic signatures are legally enforceable under the federal ESIGN Act (15 U.S.C. ch. 96, 2000) and UETA in most states if intent, consent, attribution, and record retention are satisfied.
When is a paper signature still required?
Certain exceptions exist for wills, court orders, and other specified documents. For invoices, paper signatures are rarely required unless a contract or buyer explicitly demands them.
What happens if the invoice has the wrong tax ID?
An incorrect TIN can trigger backup withholding (24%) and may require corrected returns. Correct the invoice and provide an accurate W-9 to the payer to avoid withholding.
Do I need to notarize an invoice?
Notarization is uncommon for standard invoices. Notarize only if a contract or local rule requires it for a supporting affidavit or sworn statement.
How long should I keep invoice records?
Follow the longest applicable retention period: IRS minimum of 3 years (IRC §6501(a)), HIPAA six-year rule for healthcare (45 CFR §164.530(j)), and any longer state or contract requirement.
How to reduce payment delays?
Provide clear PO references, exact remittance instructions, an itemized breakdown, and machine-readable invoices or payment links to accelerate AP matching and payment.

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