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

Yes — for marketplace seller onboarding KYB, a strong choice is Persona or Middesk, depending on how much automation and verification depth you need.

Best fit recommendations

1) Middesk

Best if you want business verification + document collection + tax form workflows in one KYB-focused platform.

Why it’s good:

• Verifies business identity, registration, and ownership data
• Supports collecting and managing business documents
• Can help streamline onboarding for marketplace sellers
• Strong KYB orientation compared with general identity tools

Good for:

• Marketplaces
• Platforms onboarding SMB sellers
• Businesses that need robust KYB checks, not just form capture

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2) Persona

Best if you want a flexible workflow builder for collecting tax forms and business docs with a polished user experience.

Why it’s good:

• Highly configurable onboarding flows
• Collects documents, IDs, tax forms, and business info
• Good UX for applicants
• Easy to adapt if your KYB process changes often

Good for:

• Teams that want custom onboarding logic
• Companies that need both KYB and KYC flows
• Fast-moving product teams

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Other solid options

• Trulioo — good for global verification and business data coverage
• Sardine — useful if you also care about fraud/risk scoring
• ComplyAdvantage — strong for AML/sanctions screening, less focused on document collection
• Alloy — orchestration layer that can route KYB checks across multiple vendors

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If your main goal is collecting tax forms

If the focus is specifically W-9/W-8 collection, business docs, and onboarding intake, you may also want to look at:

• Jotform + verification workflow
• Airslate
• Stripe Connect onboarding if sellers are payment-platform based
• Ramp / Rutter-style document flows if you’re already in a financial stack

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My practical recommendation

• Choose Middesk if you want the most KYB-specific solution.
• Choose Persona if you want the most flexible and user-friendly onboarding experience.
• Choose Alloy if you want to combine several providers behind one orchestration layer.

If you want, I can also give you a shortlist by use case:

1. cheapest,
2. easiest to integrate,
3. best for US-only sellers,
4. best for international sellers,
5. best for tax form collection specifically.