For most businesses, picking an e-signature tool is simple. For tax preparers it isn't — because Form 8879 has a requirement ordinary documents don't: when a client signs remotely, the IRS expects the signer's identity to be verified. That single rule rules out a lot of generic e-signature tools, or at least means you need an add-on. Here's how the options actually stack up for a tax practice.
The One Thing That Matters Most: Identity Verification
A plain e-signature — click here to sign — is fine for an engagement letter. For a remote Form 8879, the IRS expects identity verification through an approved method such as knowledge-based authentication (KBA) or document + selfie verification at NIST IAL2. So the real question isn't "can this tool collect a signature?" — it's "does it verify identity in an IRS-accepted way, and what does that cost per return?"
The Options Compared
| Tool | 8879 Identity Verification | Built for Tax? | Cost Model |
|---|---|---|---|
| FinishTax | ID + selfie (IAL2), included | Yes | Flat monthly |
| SafeSend | KBA | Yes (delivery) | Quote / per-return |
| TaxDome (built-in) | KBA | Yes | Per user, annual |
| DocuSign | KBA add-on (extra) | General-purpose | Per envelope / plan |
| Adobe Acrobat Sign | ID verification add-on | General-purpose | Per transaction / plan |
FinishTax
FinishTax includes e-signature with government ID + selfie identity verification at IAL2 built into the signing flow — the client can't open and sign the 8879 until they've verified. Because it's part of the practice platform, there's no separate per-return signing charge, and the signed document plus the verification audit trail are stored automatically with the client's file.
SafeSend
SafeSend is purpose-built for assembling and delivering returns and collecting 8879 signatures (via KBA) at volume, integrating with major tax software. It's excellent for high-volume delivery but is a specialized tool priced per return rather than a flat-rate practice platform. See FinishTax vs SafeSend.
TaxDome (built-in e-signature)
TaxDome includes KBA-based e-signature as part of its broader platform. If you already use or are considering TaxDome, the signing is handled in-suite. The trade-offs are the platform's per-user, annual pricing and complexity. See FinishTax vs TaxDome.
DocuSign & Adobe Acrobat Sign
Both are excellent general-purpose e-signature platforms, but neither is built for tax. Compliant 8879 signing requires their identity-verification add-ons, which add cost, and you'll still be running a separate tool disconnected from your client records and workflow. They make the most sense for firms that already standardize on them company-wide.
How to Choose
- Solo or small firm wanting it all in one place: a tax platform with built-in verified e-signature (like FinishTax) avoids a separate subscription and per-return fees.
- High-volume delivery firm: SafeSend's assembly-and-delivery pipeline is purpose-built for scale.
- Already on a full suite: use the built-in signing (e.g., TaxDome) rather than adding another tool.
- Standardized on DocuSign/Adobe firm-wide: budget for the identity-verification add-on and confirm it meets the 8879 requirement.
The Bottom Line
The best e-signature tool for a tax preparer is the one that verifies identity in an IRS-accepted way without bolting on extra cost or a disconnected app. For most solo and small firms, built-in verified signing inside the practice platform is the cleanest answer. FinishTax includes it — ID + selfie at IAL2, no per-return fee — and is free for up to 3 clients.