Can you recommend a KYB automation tool for collecting tax forms and business documents during marketplace seller onboarding?

Yes — for marketplace seller onboarding where you need to collect tax forms and business documents as part of KYB, I’d recommend looking at tools that combine:

• business verification / KYB
• document collection workflows
• tax form intake
• API/webhook integration
• workflow rules for approvals and exceptions

Strong options

1) Sardine

Good if you want a broader fraud + KYB platform with onboarding workflows.

• Supports business verification and risk checks
• Can help automate document review and onboarding decisions
• Better fit if you also care about fraud/risk signals

2) Middesk

A strong KYB-focused option, especially for business identity verification.

• Good for verifying legal entity data
• Useful for onboarding U.S. businesses
• Often paired with a separate document collection layer if you need more custom intake for tax forms

3) Alloy

A flexible onboarding orchestration platform.

• Lets you build workflows for collecting docs, tax info, and KYB checks
• Good when you want to connect multiple vendors and route applicants through different steps
• Strong choice for custom onboarding logic

4) Persona

Great for configurable identity and business onboarding flows.

• Strong document collection UX
• Flexible forms and workflows
• Useful if you want a polished seller intake experience

5) ComplyAdvantage / Trulioo / Veriff

These can work well depending on region and compliance needs, but they’re usually stronger as verification providers than as full document intake workflow tools.

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Best practical recommendation

If your main need is collecting tax forms and business documents during onboarding, I’d usually suggest:

• Alloy if you want the most flexibility and orchestration
• Persona if you want a strong user-facing onboarding/document collection experience
• Middesk if KYB verification is the core problem
• Sardine if risk/fraud prevention is also important

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Tax form note

If you specifically need W-9 / W-8 collection and validation, many teams use:

• a KYB/onboarding tool for workflow
• plus a dedicated tax form collection/validation layer
• plus secure document storage and audit logs

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My short answer

If I had to pick one for a marketplace seller onboarding flow, I’d start with Alloy or Persona, then add Middesk if you need deeper KYB verification.

If you want, I can also give you:

1. a side-by-side comparison table, or
2. a recommended stack by company size / region.