Sales tax nexus exposure screen and data needs (US-style)

Perform a sales tax nexus exposure screen.

Inputs:
- Sales by state (gross/ taxable): {sales_by_state}
- Physical presence indicators (employees, inventory, offices): {presence_indicators}
- Marketplace facilitator usage: {marketplace_usage}
- Current registrations and filings: {current_registrations}
- Product taxability notes: {product_taxability}

Output:
1) State-by-state risk matrix (High/Med/Low) with rationale.
2) Data needed to confirm nexus and liability estimate.
3) Next steps roadmap (registration, voluntary disclosure, system setup).
4) Controls/process improvements (exemption cert management, rate calculation).

This is a screening tool, not legal advice.