Establishing secure connection…Loading editor…Preparing document…

Tax Services Addendum

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

TAX SERVICES ADDENDUM

Parties and Effective Date

Client Name:

Effective Date:

Scope of Tax Services

Description of Services: The Service Provider will prepare and file the federal and state tax returns and related schedules and forms expressly listed below for the period and tax types specified. Services also include reasonable consultation and review of client-provided tax records necessary to prepare the returns identified. Any services not expressly listed require separate written authorization and may incur additional fees.

Engagement Period

Engagement Start Date:

Engagement End Date (if applicable):

Client Identifying Information

Individual / Sole Proprietor    C Corporation    S Corporation

Partnership    Trust / Estate    LLC    Other

Taxpayer Identification Number (TIN)

Provide either Social Security Number or Employer Identification Number. Only one is required depending on entity type.

Authorizations and Consents

Client authorizes the Service Provider to obtain taxpayer information from third parties, including wage and income transcripts and account transcripts, as necessary to prepare returns and to verify prior-year information.

Client consents to electronic filing of returns prepared under this addendum and agrees to receive return filings and related communications electronically unless otherwise requested in writing.

Client consents to limited disclosure of tax return information to third-party vendors engaged by the Service Provider solely for preparation, filing, and payment processing.

Fees, Billing, and Retainer

Fees for the services described in this addendum will be billed as agreed below. Payment terms are net upon invoicing unless otherwise set forth in the underlying engagement agreement. Additional services performed outside the scope will be billed separately.

Records, Access, and Retention

Client is responsible for providing complete and accurate records. The Service Provider will retain workpapers and electronic copies of prepared returns for a reasonable period as required by professional standards, but primary responsibility for original records remains with the Client.

Limitation of Liability and Third-Party Representation

The Service Provider will perform services with due professional care but will not assume liability for penalties or interest assessed due to incomplete or inaccurate information provided by the Client. This addendum does not authorize the Service Provider to act as legal counsel; representation before taxing authorities beyond routine communications requires separate written engagement.

Certification and Acknowledgment (Perjury Warning)

By signing below, the Client certifies under penalty of perjury that the information provided to the Service Provider is true, correct, and complete to the best of the Client's knowledge. The Client acknowledges the following statements:

1. I have provided all income, deduction, and other pertinent tax information necessary for preparation of the returns covered by this addendum and will provide any additional information requested.

2. I understand that the Service Provider will rely upon documents and representations I supply and that the Service Provider is not responsible for errors or omissions resulting from incomplete or inaccurate information.

3. I authorize the Service Provider to sign my tax returns as my authorized e-file transmitter if required and as permitted by applicable rules, and to discuss tax matters with tax authorities on my behalf when necessary to resolve filing or processing issues.

4. I accept responsibility for timely payment of fees and any taxes, penalties, or interest assessed as a result of returns prepared under this addendum.

Signature of Taxpayer

Printed Name:

Signature:

Date:

Enter text✕

What the Tax Services Addendum Covers

A Tax Services Addendum is a contractual attachment that supplements a primary service agreement to define tax-related responsibilities, reporting obligations, and information exchange between the parties. It typically documents who will collect and report tax information, how taxpayer identification numbers (TINs) are verified and stored, whether backup withholding may apply, and which party is responsible for preparing or providing information returns such as Forms 1099. The addendum also identifies effective dates, signer authority, and any notarization or witness requirements needed for the jurisdiction or transaction.

Why this Addendum Matters for Compliance

The Tax Services Addendum reduces ambiguity about tax responsibilities, protects payers from backup withholding and reporting errors, and documents procedures for TIN collection and verification. Clear allocation of duties lowers the likelihood of IRS penalties and supports accurate recordkeeping and audit readiness.

Why this Addendum Matters for Compliance

Typical Users and Responsible Parties

The addendum is used by organizations that engage third parties for tax-reportable services or that need formal allocation of tax compliance tasks.

  • Accounting firms and tax preparers managing client reporting and information returns.
  • Payroll and benefits administrators handling withholding and vendor payments.
  • Vendors, contractors, and third-party service providers supplying TINs and tax-related attestations.

Use this addendum whenever tax reporting, TIN exchange, backup withholding exposure, or independent contractor classification needs to be documented between contracting parties.

How to Complete the Addendum — Stepwise

Follow these steps to prepare, verify, and finalize the Tax Services Addendum with clear signatory authority and supporting records.

  • 01
    Gather Documents: Collect W-9s, payer details, and supporting ID for each payee.
  • 02
    Fill Fields: Enter legal names, TINs, effective dates, and scope of services.
  • 03
    Verify Information: Confirm TINs via IRS TIN Matching or documentation before signing.
  • 04
    Sign & Record: Obtain authorized signatures and store the executed addendum securely.

Online Configuration for Digital Completion

Configure the e-sign workflow to capture identity, audit data, and conditional fields before sending the addendum for signature.

Field Configuration
Authentication Email link or SMS one-time passcode
Conditional Logic Show TIN field only for applicable payees
Audit Trail Capture IP, timestamp, and signer actions
Template Locking Prevent edits after send to preserve integrity

Typical Processing Flow for Filing and Distribution

This flow summarizes how the addendum moves from preparation through signature to storage and distribution.

  • Upload Document: Upload finalized addendum and attach supporting W-9s.
  • Assign Signers: Designate authorized signers and set signing order.
  • Sign & Authenticate: Signers authenticate, review, and apply digital signatures.
  • Store & Distribute: Save executed copies and distribute to stakeholders and payroll/reporting teams.

Digital Signing and Integration Considerations

Choose a platform that captures a complete audit trail, supports required authentication, and preserves executables in standard formats.

  • File Formats: PDF, DOCX supported
  • Authentication: Email, SMS OTP, or stronger
  • Integrations: CRM, ERP, cloud storage

Ensure the chosen platform supports e-signature legality (ESIGN/UETA), stores tamper-evident copies, and integrates with payroll or accounting systems for timely tax reporting and audit response.

Key Filing and Response Deadlines to Track

Monitor payer and IRS deadlines that affect reporting obligations tied to the addendum and supporting forms.

W-9 Provision:

Provide on request; collect before payment where possible

1099-NEC Deadline:

Recipient and IRS copies due Jan 31 each year

1099-MISC Deadlines:

Recipient due Jan 31; paper IRS Feb 28, electronic IRS Mar 31

1040 Individual:

Federal return due April 15; extension to Oct 15 with Form 4868

FBAR Deadline:

April 15 with automatic extension to Oct 15

Milestone Timeline for Addendum Processing

A sequential milestone view helps coordinate drafting, internal approvals, signer execution, and reporting tasks.

01

Draft and Attach

Prepare the addendum and attach W-9s and supporting ID

02

Internal Review

Legal or tax team verifies language and responsibilities

03

Execution

Authorized parties sign electronically or in person

04

Reporting & Filing

Complete applicable 1099s and retain records for audits

Common Preparation Errors to Avoid

  • Submitting incorrect or mismatched TINs that trigger backup withholding and IRS notice cycles if not corrected promptly.
  • Failing to document signer authority or attaching corporate resolutions, which can undermine enforceability during an audit or dispute.
  • Using vague service descriptions that leave payment characterization ambiguous for 1099 reporting and tax classification purposes.
  • Not verifying W-9 authenticity or failing to keep proof of receipt, increasing exposure to penalties and collection risk.

Penalties and Compliance Risks

1099 Late Penalty: Tiered $60/$130/$330 (IRC §6721)
Intentional Disregard: $660+ per form, no cap (IRC §6721)
Backup Withholding: 24% withheld for missing/incorrect TIN
I-9 Violations: Civil fines $281–$2,789 per violation
Recordkeeping Failure: Penalties and increased audit risk
Misclassification Risk: Reclassification liability and tax assessments

Security and Compliance Controls to Preserve Evidence

Transport Encryption: TLS 1.2/1.3
At-Rest Encryption: AES-256
Audit Trails: IP, timestamp, action logs
Certifications: SOC 2 Type II, ISO 27001
Regulatory Fit: ESIGN, UETA compliant
Healthcare Support: HIPAA available with BAA

Representative eSignature Pricing and Feature Comparison

Select a provider that meets authentication, audit trail, and HIPAA needs; the table lists starting prices and common feature availability for comparison.

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 Varies by plan Varies by plan Varies by plan Varies by plan
Bulk Send Yes (Business Premium) Yes Yes Yes No
Audit Trail Yes Yes Yes Yes Yes
HIPAA Compliant Yes Yes Yes No No

Real-World Examples of Use

These examples show how organizations attach tax addenda to manage reporting and signing at scale.

Martin Properties

Martin Properties standardized a Tax Services Addendum across rental transactions to collect vendor TINs and authorize reporting.

  • Mobile and offline signing supported signings on site.
  • Tim Martin said, "I can process and execute all of these documents online with 100% compliance and built-in security. Whether on mobile or working offline, I can get forms back to their necessary parties efficiently."

Fertility Centers

A healthcare provider added tax and privacy provisions to vendor contracts to align with HIPAA and reporting rules.

  • Added BAA where PHI intersects payments.
  • John Butler noted that integrated signing and secure storage helped maintain compliance and responsiveness to audit requests while retaining patient privacy safeguards.

Practical Tips for Accurate, Efficient Completion

Adopt these practices to reduce rework, avoid penalties, and ensure a defensible audit trail.

Verify TINs Before Payment
Use IRS TIN Matching or obtain completed W-9s in advance. Verifying TINs reduces the risk of backup withholding or information return rejections and minimizes follow-up notices.
Use Clear Service Descriptions
Describe services, billing periods, and whether amounts are fees, reimbursements, or pass-throughs. Clear descriptions prevent mischaracterization on Forms 1099 and ensure consistent tax treatment.
Document Signer Authority
Record titles and attach board resolutions or delegated authority when an entity signs. Proper evidence of authority reduces challenges to enforceability and supports audits.
Preserve Audit Trails
Capture IP addresses, timestamps, and signer authentication records. Maintain tamper-evident copies in secure storage to support IRS inquiries or dispute resolution.

Frequently Asked Questions and Troubleshooting

Answers to common questions about executing, validating, and storing the Tax Services Addendum.


Need help? Contact support

be ready to get more
Join over 28 million airSlate SignNow users