Can an invoice be e-signed?

Yes. Under the ESIGN Act and state UETA statutes, electronic signatures are enforceable when intent, consent, attribution, and retention are demonstrable. Maintain an audit trail to show signer identity and timestamp.

What happens if I enter the wrong TIN?

If an incorrect TIN is used, the payer may be required to withhold backup withholding at 24% and file corrected returns. Correct and reissue the document and coordinate 1099 filings with the payer and IRS guidance.

Is notarization required for invoices?

Typically no. Standard commercial invoices do not require notarization, though associated documents such as sworn affidavits, lien waivers, or powers of attorney may require notary or RON per state rules.

How should I correct an issued invoice?

Issue a corrected or credit invoice that references the original invoice number, describe the correction, and provide updated totals. Keep the original, the correction, and audit trail for records and tax reporting.

How long must I keep signed invoices?

Retain invoices at least three years for IRS purposes (IRC §6501(a)); healthcare-related records must be kept six years (45 CFR §164.530(j)). Industry-specific rules may require longer retention.

What level of authentication is appropriate?

Use email link or SMS code for most B2B invoices. For higher-risk transactions or regulated industries, consider stronger signer authentication and maintain a platform audit trail to support attribution.

Electronic Signature
Templates
Project Management
Project Management SPA Invoice Template

Project Management SPA Invoice Template

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

PROJECT MANAGEMENT SPA INVOICE TEMPLATE

Project Identification

Project Title Project ID / SPA Reference

Client Name Client Address

Service Provider Provider Address

Project Manager Manager Contact

Invoice Details

Invoice Number: Invoice Date: Due Date:

Billing Period Start: End: Currency:

Scope and Services Billed Out-of-Scope Items (if any)

Deliverables and Itemized Charges

List each deliverable, the acceptance status, units/hours, rate, and amount. Amounts must align with SPA terms and any approved change orders.

Deliverable

Acceptance Status

Quantity / Hours

Unit Rate

Line Amount

Attach or reference approved change orders where amounts deviate from the original SPA.

Subtotal Taxes (specify)

Adjustments / Credits Total Due

Amount This Invoice Retainage (if applicable)

Timeline & Milestones

Project Start: Project End:

Milestones (name and date)

Payment Terms, Banking, and Schedules

Payment Terms

Bank / Payee Name Bank / Account Number

Bank Name Payment Reference

Change Orders and Adjustments

All modifications to the SPA that affect scope, budget, or schedule must be documented in a written change order signed by both parties. Charges shown on this invoice that arise from approved change orders must reference the change order number below.

Approved Change Order Reference(s) Attach change order?

Legal, Confidentiality & Governing Law

Confidentiality: The recipient of this Invoice shall treat all non-public information disclosed in connection with the SPA and related deliverables as confidential. Recipient shall not disclose such information to third parties except as required by law or with prior written consent of the disclosing party. Confidential information excludes information that is publicly available through no fault of the recipient.

Taxes and Withholding: Unless otherwise specified, all fees are exclusive of taxes. Client is responsible for taxes imposed on payments to the Service Provider, except for taxes based on the Service Provider's net income.

Governing Law: This Invoice and any dispute arising from it shall be governed by the laws of without regard to conflict of laws principles. The parties agree that remedies at law may be inadequate and that equitable relief may be sought in addition to other remedies.

Late Payment: Unpaid amounts shall accrue interest at 1.5% per month (18% per annum) or the maximum rate permitted by applicable law, whichever is lower, commencing on the day after the due date until paid in full. Client will also reimburse reasonable collection and legal costs incurred by the Service Provider to recover overdue amounts.

Invoice Certification

By signing below, the signatory certifies that the services and deliverables billed herein were performed in accordance with the SPA and applicable change orders, that the amounts invoiced are true and correct, and that all work billed for as "Accepted" has met the acceptance criteria set forth in the SPA or approved acceptance documentation.

Name of Certifying Representative

Additional Notes

Client - Printed Name:

By:

Date:

Service Provider - Printed Name:

By:

Date:

What the Project Management SPA Invoice Template Is

The Project Management SPA Invoice Template is a standardized, fillable invoice designed for billing project-related services, milestones, and phased work. It organizes client and vendor details, line items, hourly or fixed fees, taxes, payment terms, and any project-phase references so accounting and project teams can reconcile costs quickly. The template supports attachments for timesheets or change orders and is suitable for electronic delivery and signature, with spaces for invoice number, issue date, due date, and remittance instructions to reduce disputes and accelerate payment cycles.

Why use a Project Management SPA Invoice Template

A consistent invoice template reduces billing errors, speeds approvals, and creates a clear audit trail for project phases and change orders. When paired with an eSignature platform that complies with ESIGN and UETA, the template supports legally enforceable electronic records and reduces paper handling while preserving timestamps and signer attribution.

Who typically prepares and receives this invoice

The template is used across project teams, vendors, and finance departments to standardize billing for phased work and service agreements.

Project managers and PMOs preparing milestone-based or phase invoices for clients.
Independent contractors and subcontractors billing for completed tasks or deliverables.
Accounts payable and accounts receivable teams processing payments and recording receipts.

Use consistent naming, invoice numbering, and attachment practices so internal teams and external clients can match invoices to purchase orders and work logs.

Essential parts of a professional SPA invoice

A professional Project Management SPA Invoice Template groups administrative, commercial, and project-specific data so reviewers can verify charges at a glance and route the document for approval.

Header

Vendor and client legal names, addresses, tax IDs, and invoice number to identify parties and enable tax reporting.

Dates

Issue date, invoice period, and due date are clearly shown so payment timing and late-fee triggers are unambiguous.

Line Items

Detailed descriptions, quantities, rates, hours, and project phase or milestone references so charges map to work performed.

Taxes and Fees

Separate sales tax, withholding, or other charges with jurisdiction and tax ID references to support compliance.

Payment Terms

Net terms, accepted payment methods, remittance address, and late-fee policy to reduce collection disputes.

Attachments

References to supporting documents such as timesheets, change orders, and acceptance certificates for auditability.

Security and compliance checkpoints

In-transit encryption: TLS 1.2/1.3

At-rest encryption: AES-256

Audit trail: Timestamped activity log

ESIGN / UETA: Legal e-signature framework

HIPAA support: BAA available

Certifications: SOC 2 Type II, ISO 27001

Step-by-step: prepare and issue the invoice

Follow these sequential steps to complete, approve, and deliver the invoice so it can be accepted and processed without rework.

01

Prepare template: Populate client, vendor, and project identifiers.
02

Add line items: List deliverables, hours, and rates with references.
03

Attach evidence: Include timesheets, change orders, and acceptance.
04

Send for signature: Route electronically for signing and delivery.

Configuring an online invoice workflow

Set validation, authentication, notifications, and archival settings before sending to ensure consistent processing and a clear audit trail.

Field	Configuration
Validation rules	Require numeric totals, MM/DD/YYYY for dates
Signer authentication	Email link or SMS code
Notifications	Automated reminders at configurable intervals
Storage	Save signed PDF to cloud archive

Where to send or file completed invoices

Routing the signed invoice to the correct recipient and storage location helps speed payment and preserves a single source of truth for audits.

Client billing contact: Send signed invoice to the client's accounts payable email or portal.
Internal accounting: Forward a copy to AP for payment scheduling and ledger entry.
Cloud archive: Store the signed PDF in a secure cloud folder or document management system.
Tax records: Retain copies for tax reporting and 1099 reconciliation.

Digital signing and technical integrations

Verify the file formats, authentication level, and storage connectors your eSignature provider supports before you implement.

File formats: PDF and DOCX supported
Integrations: NetSuite, Salesforce, Google Workspace
Authentication: Email, SMS code, or stronger

Typical timing and reporting deadlines

Track key billing dates and tax-reporting windows to avoid late fees and reporting penalties when invoices generate taxable income or contractor payments.

Issue timing:

Send invoice when milestone is accepted

Payment terms example:

Net 30 from invoice issue date

Late fee trigger:

Apply late fees after the due date per terms

1099-NEC reporting:

Contractor payments may require Form 1099-NEC reporting by Jan 31

Recordkeeping:

Retain invoice copies for IRS and audit purposes

Common preparation mistakes to avoid

Using inconsistent invoice numbers or duplicate identifiers that confuse tracking and reconciliation across projects.
Leaving payment instructions incomplete or inconsistent, which delays electronic transfers and manual processing.
Failing to attach acceptance evidence or timesheets, causing disputes and payment holdbacks from clients.
Entering incorrect tax IDs or client names, which can trigger backup withholding or tax-reporting errors.

Risks and potential penalties from errors

Backup Withholding: 24% rate applies

1099 Filing Penalties: $60–$330 per form

Intentional Disregard: $660+ per form

Late Payment Costs: Interest and collections fees

Contract Disputes: Delays and legal costs

Recordkeeping Violations: Fines or audit exposure

Comparing common eSignature options for invoice workflows

Vendor pricing and feature availability vary; signNow is listed first. Use the table to compare starting price, trial availability, bulk send, audit trail, HIPAA support, and envelope caps.

	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	7-day free trial	No	No	Yes, limited	Yes, limited
Bulk Send	Yes	Yes	Yes	Yes	No
Audit Trail	Yes	Yes	Yes	Yes	Yes
HIPAA Compliant	Yes	Yes	Yes	No	No

Frequently asked questions about SPA invoices

Answers to common questions about completing, signing, and storing Project Management SPA Invoice Templates, with notes on legal and practical consequences.

Need help? Contact support

Can an invoice be e-signed?
Yes. Under the ESIGN Act and state UETA statutes, electronic signatures are enforceable when intent, consent, attribution, and retention are demonstrable. Maintain an audit trail to show signer identity and timestamp.
What happens if I enter the wrong TIN?
If an incorrect TIN is used, the payer may be required to withhold backup withholding at 24% and file corrected returns. Correct and reissue the document and coordinate 1099 filings with the payer and IRS guidance.
Is notarization required for invoices?
Typically no. Standard commercial invoices do not require notarization, though associated documents such as sworn affidavits, lien waivers, or powers of attorney may require notary or RON per state rules.
How should I correct an issued invoice?
Issue a corrected or credit invoice that references the original invoice number, describe the correction, and provide updated totals. Keep the original, the correction, and audit trail for records and tax reporting.
How long must I keep signed invoices?
Retain invoices at least three years for IRS purposes (IRC §6501(a)); healthcare-related records must be kept six years (45 CFR §164.530(j)). Industry-specific rules may require longer retention.
What level of authentication is appropriate?
Use email link or SMS code for most B2B invoices. For higher-risk transactions or regulated industries, consider stronger signer authentication and maintain a platform audit trail to support attribution.

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