MCP For Claude Marketplace
US Section 409A Impact Calculator

US Section 409A Impact Calculator MCP Connector for Claude

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Calculate legal strike price floors, tax penalties for non-compliant grants, and exercise window rules.

4 tools Official Updated Jun 28, 2026 Official Vinkius Partner
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This MCP server provides essential tools for managing US stock option compliance under Section 409A. It allows AI agents to determine the legal minimum strike price using calculate_minimum_strike, estimate financial liabilities with estimate_tax_penalty, and understand regulatory windows via lookup_exercise_rules. For a complete audit, use analyze_grant_compliance to evaluate proposed grants against FMV and option types (ISO/NSO).

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4 tools expose this connector's capabilities to your AI agent.

lookup_exercise_rules

Provides regulatory window and tax implications for exercising options

analyze_grant_compliance

A comprehensive audit tool for evaluating a proposed grant scenario

calculate_minimum_strike

Determines the lowest legally permissible strike price

estimate_tax_penalty

Calculates the estimated financial burden if options are granted below FMV

See how to talk to your AI agent using US Section 409A Impact Calculator.

What is the minimum strike price if my current FMV is $15.50?

Based on a current FMV of $15.50, the `calculate_minimum_strike` tool indicates that your minimum legal strike price is $15.50.

Calculate the penalty for a grant with a $12.00 strike price when FMV is $15.00.

Using `estimate_tax_penalty`, the taxable spread is $3.00, which triggers a 20% penalty plus applicable interest.

Check if a grant with a $14.00 strike price is compliant for an ISO at $15.00 FMV.

The `analyze_grant_compliance` tool identifies this grant as 'Non-Compliant' because the strike price is below the current FMV of $15.00.

Use the `calculate_minimum_strike` tool by providing the current Fair Market Value (FMV) and the valuation date.

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