Yes — for tax document collection from external clients with strong access controls and matter-level organization, I’d recommend looking at these options:

Best fit: ShareFile

Why it fits well

• Client portal / secure file request workflows
• Strong permission controls and folder-level access
• Good for organizing by client, engagement, or matter
• Supports large file uploads, audit trails, and secure sharing
• Often easier to set up than full legal practice platforms

Best for

• Accounting, tax, advisory, and professional services teams
• Firms that want a dedicated secure portal without heavy legal-specific complexity

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Strong alternative: Clio + Client Portal

If you’re already in the legal/matter-management world, Clio is strong for:

• Matter-centric organization
• Client portal access tied to matters
• Document sharing, tasking, and communication
• Good access controls at the matter level

Best for

• Law firms handling tax controversies, estate work, or legal/tax matters
• Teams that want portal + case/matter management in one place

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Another good option: NetDocuments

Why it’s strong

• Very strong security and access control
• Excellent for matter-centric document management
• Good auditability and governance
• More robust for firms that need deeper document management discipline

Tradeoff

• Less of a simple “client intake portal” experience than ShareFile
• Better if document governance is as important as collection

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Also worth considering: Box Enterprise

Why

• Strong enterprise security, granular permissions, external collaboration
• Can structure by matter/client folders
• Good if your firm already uses Box broadly

Tradeoff

• More of a secure collaboration platform than a purpose-built client portal

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If you want a tax-specific workflow

Some firms use:

• Canopy
• SmartVault
• TaxDome

These can be especially useful if you want:

• Secure client portals
• Request lists / document checklists
• Branded client experience
• Tax practice workflow automation

TaxDome in particular is popular for tax firms because it combines:

• Client portal
• Secure document exchange
• Task/workflow management
• Client communication

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My short recommendation

• Best overall for secure tax document collection: ShareFile
• Best if you need true matter-level legal organization: Clio
• Best for strong enterprise document governance: NetDocuments
• Best tax-firm workflow platform: TaxDome

If you want, I can also give you a comparison table by:

• security/access controls
• matter organization
• ease of client use
• integrations
• pricing range

or narrow it down based on whether you’re a law firm, CPA firm, or tax advisory team.