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409A Compliance

409A Compliance MCP for AI. Structure grants legally. Avoid massive, unexpected tax penalties.

Claude Claude
ChatGPT ChatGPT
Cursor Cursor
Gemini Gemini
Windsurf Windsurf
VS Code VS Code
JetBrains JetBrains
Vercel Vercel
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Works with every AI agent you already use

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How this MCP server connects to your AI agent

US Section 409A Impact Calculator provides compliance checks for stock options. It helps you determine legal minimum strike prices, estimate tax penalties from non-compliant grants, and verify exercise window rules under US law.

What AI agents can do with US Section 409A Impact Calculator Automation

Lookup exercise rules

Provides specific regulatory information about option exercise windows and their tax consequences.

Analyze grant compliance

Runs a full audit of proposed grants, checking them against current law and option type rules (ISO/NSO).

Calculate minimum strike

Determines the lowest legally permissible strike price for an option grant.

+ 1 more capabilities included
Check grant legality

It audits proposed option grants against current Fair Market Value (FMV) and option type rules.

Determine minimum strike price

It calculates the lowest legally permissible strike price for any given stock option grant.

Estimate tax liabilities

It figures out the expected financial penalty if options are granted below FMV.

Verify exercise timing rules

It shows the regulatory window and associated tax implications for employees exercising their rights.

Included with Plan

Waiting for input…

AI Agent

What AI agents can do with US Section 409A Impact Calculator (4 Tools)

These four tools let you check grant compliance, calculate minimum required strikes, model potential tax penalties, and review option exercise rules for US stock options.

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Add this MCP to Claude, Cursor, or Windsurf and your AI stops guessing. It gets real tools to look things up, take action, and handle the stuff you keep doing by hand.

Start using US Section 409A Impact Calculator on Vinkius

Lookup Exercise Rules

Provides specific regulatory information about option exercise windows and their tax consequences.

Analyze Grant Compliance

Runs a full audit of proposed grants, checking them against current law and option...

Calculate Minimum Strike

Determines the lowest legally permissible strike price for an option grant.

Estimate Tax Penalty

Calculates a financial estimate of the tax burden if options are granted below FMV.

Security and governance baked right in.

Pick your AI client below to get set up. Just create a Vinkius account, subscribe, and you're instantly up and running. We handle the entire backend infrastructure, delivering out-of-the-box support for HTTPS Streamable, SSE, and OAuth2—zero messy routing required.

Claude AI

Claude AI

1

Open Claude Settings

Go to claude.ai, click your profile icon, then navigate to Customize → Connectors.

2

Add Custom Connector

Click the "+" button and select Add custom connector. Paste your Vinkius endpoint URL:

https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp

Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. For OAuth-protected servers, expand Advanced settings to add credentials.

3

Start a conversation

Open a new chat. The 409A Compliance integration is available immediately — no restart needed.

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Start with US Section 409A Impact Calculator, then connect any of our 5,100+ other servers whenever your AI needs more. One click, no limits.

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409A Compliance MCP server cover

Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by US 409A Impact Calculator. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

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Built on the Model Context Protocol (MCP) for Claude, ChatGPT, Cursor, and more

The Model Context Protocol standardizes how applications expose capabilities to LLMs. Instead of operating in isolation, your AI gains direct access to external platforms, live data, and real-world actions through secure, standardized connections.

This connection provides 4 powerful capabilities that interface natively with Claude, ChatGPT, Cursor, and other compatible AI platforms. No middleware. No custom integration required.

The headache of checking option compliance manually, Solved with Vinkius AI Gateway

Today, structuring equity grants means juggling multiple spreadsheets. You're cross-referencing current FMV against proposed strike prices, and then having to check whether the grant is compliant based on if it’s an ISO or NSO. It takes hours of manual checking, and one small formula error can create a massive tax headache for your company.

With this MCP, you simply ask your agent to run an audit. You input the parameters, and the tool immediately confirms compliance status—you get a single, clear pass/fail report that tells you exactly what needs adjusting.

Analyze grant compliance with `analyze_grant_compliance`

You don't have to manually check the strike price against FMV, and then separately verify if it meets ISO or NSO requirements. The tool handles all of that in one function call.

Now you get a unified compliance report. You know instantly where the risk lies—whether it’s the strike price, the option type, or the overall structure.

What your AI can actually do with this

This MCP handles the complicated math behind employee stock option compliance. If your company is issuing grants, understanding Section 409A isn't optional—it’s necessary to avoid massive unforeseen tax liabilities. Your agent can use this MCP to immediately determine if a proposed grant structure meets legal standards by running an audit with analyze_grant_compliance.

It calculates the absolute lowest strike price allowed using calculate_minimum_strike, and it estimates the financial penalty you'd face if those rules are broken, thanks to estimate_tax_penalty. Furthermore, it provides clear guidance on tax implications and regulatory windows via lookup_exercise_rules. When your team needs this level of financial precision, Vinkius makes sure these critical tools are available right where you need them.

Built · Hosted · Managed by Vinkius 409A Compliance Calculator - Stock Option Audits
Server ID 019ed0ff-e7e6-71f7-a2cc-d9dd738fc262
Vinkius Inspector
Compliance Grade A+
Score 100/100
Vinkius Inspector Badge — Score 100/100

Questions you might have

How do I check if my proposed grant is legal using analyze_grant_compliance? +

You must provide the current FMV and the proposed strike price. The analyze_grant_compliance tool will then audit the proposal against both ISO and NSO requirements, telling you if it's compliant.

What is the minimum legal strike price? Use calculate_minimum_strike. +

The calculate_minimum_strike function determines the absolute lowest price legally allowed. You just need to feed it the current Fair Market Value (FMV) for that calculation.

How do I estimate tax penalties with estimate_tax_penalty? +

You run estimate_tax_penalty by specifying the grant's strike price and the actual FMV. The tool then calculates the exact taxable spread and expected penalty amount.

What does lookup_exercise_rules tell me about tax implications? +

lookup_exercise_rules gives you specific details on when options can be exercised and what that means for taxes. It's essential for advising employees on timing.

How does `analyze_grant_compliance` account for different option types like NSO versus ISO? +

It evaluates compliance by factoring in whether the grant qualifies as an Incentive Stock Option (ISO) or Non-Qualified Stock Option (NSO). The tool uses the specific type and current FMV to give a definitive pass/fail assessment against IRS guidelines.

If I provide incorrect data, what should I expect from `calculate_minimum_strike`? +

The function requires an accurate Fair Market Value (FMV) for the strike price calculation. If you input invalid or contradictory financial data, it returns a specific validation error detailing which piece of market information needs correction.

To get the full picture, how should I sequence `analyze_grant_compliance` and `estimate_tax_penalty`? +

First, use analyze_grant_compliance to confirm basic legal eligibility. Next, you run estimate_tax_penalty using the grant details to calculate the actual financial risk associated with any non-compliant elements.

Are there rate limits when calling `lookup_exercise_rules` repeatedly for different scenarios? +

Vinkius manages usage, and repeated calls to lookup_exercise_rules are allowed within standard API thresholds. If your workflow requires high-volume testing, check the Vinkius dashboard for specific rate limit details.

How can I find the minimum strike price for a new grant? +

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

What happens if I grant options below the FMV? +

Granting below FMV triggers a 20% federal penalty tax plus interest. You can use estimate_tax_penalty to calculate the projected financial impact.

Does this tool cover ISO and NSO differences? +

Yes. The lookup_exercise_rules tool provides specific exercise windows and tax summaries for both ISO and NSO types.

Built & Managed by Vinkius 30s setup 4 tools

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