US 409A Impact Calculator Connector for AI agents.
4 live capabilities
Ensure your startup equity grants meet IRS strike price and tax compliance standards.
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Why people use US 409A Impact Calculator
US Section 409A Impact Calculator for IRS Equity Compliance
This Connector lets your agent do the heavy lifting. You just tell your AI client the valuation and the grant details, and it returns the compliance status and tax risks immediately. You get a clear go or no-go on every option batch.
What Vinkius changes
You get instant, accurate 409A compliance checks for every equity grant.
Use it from Claude, ChatGPT, Cursor or another AI client you already have.
One account · 5,900+ Connectors
- Real-world use case 01
Checking a new hire's offer
A founder wants to give a new engineer 10,000 options.
- Real-world use case 02
Retroactive penalty check
HR realizes a past grant was issued below FMV.
- Real-world use case 03
Annual equity audit
A finance manager runs analyze_grant_compliance on all active grants to ensure everything is still compliant as the company valuation changes.
Complete set · 4capabilities
The complete US 409A Impact Calculator capability set.
These are the exact actions your AI can choose when you ask it to work with US 409A Impact Calculator.
01—04
4 capabilities in this set.
Part of 4 available through US 409A Impact Calculator.
- 01 Capability
Analyze grant compliance
Run a full audit on a proposed grant to see if it meets FMV and option type requirements. It catches non-compliant grants before they become problems.
- 02 Capability
Calculate minimum strike
Find the lowest legal strike price you can offer based on current valuation. It removes the guesswork from your equity math.
- 03 Capability
Estimate tax penalty
See how much a non-compliant grant will cost in taxes and penalties for the employee. It helps you avoid costly mistakes.
- 04 Capability
Lookup exercise rules
Get the specific regulatory windows and tax rules for exercising stock options. This helps you give accurate info to your team.
Set up in minutes
One URL. Then ask US 409A Impact Calculator to work.
Claude and ChatGPT only need the Connector URL. Copy it once, add it in settings, and use US 409A Impact Calculator from the conversation.
Choose your client
Live previewAdvanced clients IDE · CLI
Claude · Web + desktop
Connector URL · ready to paste
Streamable HTTPhttps://edge.vinkius.com/vk_preview_7ZkvoXpHa5AkS1CWLLy1OSbvo0tJVPsXFTYKHrXA/mcp - Step 01
Open Connectors
In Claude Web or Claude Desktop, open Settings and choose Connectors.
- Step 02
Add the URL
Choose Add custom connector, name it US 409A Impact Calculator, and paste the URL above.
- Step 03
Turn it on in chat
Select +, open Connectors, and enable US 409A Impact Calculator for the conversation.
ChatGPT · Web + desktop
Connector URL · ready to paste
Streamable HTTPhttps://edge.vinkius.com/vk_preview_7ZkvoXpHa5AkS1CWLLy1OSbvo0tJVPsXFTYKHrXA/mcp - Step 01
Open MCP settings
On desktop, open Settings and MCP servers. On web, open your workspace app or connector settings.
- Step 02
Add the URL
Choose Add server with Streamable HTTP, or create a custom MCP app, then paste the US 409A Impact Calculator URL.
- Step 03
Save and start
Save the connection and enable US 409A Impact Calculator in your conversation. Desktop may ask you to restart once.
Cursor · IDE configuration
Advanced setup
{
"mcpServers": {
"us-section-409a-impact-calculator": {
"url": "https://edge.vinkius.com/vk_preview_7ZkvoXpHa5AkS1CWLLy1OSbvo0tJVPsXFTYKHrXA/mcp"
}
}
}- Step 01
Open MCP Settings
Press Cmd+Shift+P (macOS) or Ctrl+Shift+P (Windows/Linux) → search "MCP Settings"
- Step 02
Add the server config
Paste the JSON configuration above into the mcp.json file that opens
- Step 03
Save the file
Cursor will automatically detect the new Connector
- Step 04
Start using US 409A Impact Calculator
Open Agent mode in chat and ask: "Using US 409A Impact Calculator, help me...". 4 tools available
VS Code Copilot · IDE configuration
Advanced setup
{
"mcpServers": {
"us-section-409a-impact-calculator": {
"url": "https://edge.vinkius.com/vk_preview_7ZkvoXpHa5AkS1CWLLy1OSbvo0tJVPsXFTYKHrXA/mcp"
}
}
}- Step 01
Create MCP config
Create a .vscode/mcp.json file in your project root
- Step 02
Add the server config
Paste the JSON configuration above
- Step 03
Enable Agent mode
Open GitHub Copilot Chat and switch to Agent mode using the dropdown
- Step 04
Start using US 409A Impact Calculator
Ask Copilot: "Using US 409A Impact Calculator, help me...". 4 tools available
Windsurf · IDE configuration
Advanced setup
{
"mcpServers": {
"us-section-409a-impact-calculator": {
"url": "https://edge.vinkius.com/vk_preview_7ZkvoXpHa5AkS1CWLLy1OSbvo0tJVPsXFTYKHrXA/mcp"
}
}
}- Step 01
Open MCP Settings
Go to Settings → MCP Configuration or press Cmd+Shift+P and search "MCP"
- Step 02
Add the server
Paste the JSON configuration above into mcp_config.json
- Step 03
Save and reload
Windsurf will detect the new server automatically
- Step 04
Start using US 409A Impact Calculator
Open Cascade and ask: "Using US 409A Impact Calculator, help me...". 4 tools available
Cline · IDE configuration
Advanced setup
{
"mcpServers": {
"us-section-409a-impact-calculator": {
"url": "https://edge.vinkius.com/vk_preview_7ZkvoXpHa5AkS1CWLLy1OSbvo0tJVPsXFTYKHrXA/mcp"
}
}
}- Step 01
Open Cline MCP Settings
Click the Connectors icon in the Cline sidebar panel
- Step 02
Add remote server
Click "Add Connector" and paste the configuration above
- Step 03
Enable the server
Toggle the server switch to ON
- Step 04
Start using US 409A Impact Calculator
Ask Cline: "Using US 409A Impact Calculator, help me...". 4 tools available
Claude Code · Terminal command
Advanced setup
claude mcp add us-section-409a-impact-calculator --transport http "https://edge.vinkius.com/vk_preview_7ZkvoXpHa5AkS1CWLLy1OSbvo0tJVPsXFTYKHrXA/mcp"- Step 01
Install Claude Code
Run npm install -g @anthropic-ai/claude-code if not already installed
- Step 02
Add the Connector
Run the command above in your terminal
- Step 03
Verify the connection
Run claude mcp to list connected servers, or type /mcp inside a session
- Step 04
Start using US 409A Impact Calculator
Ask Claude: "Using US 409A Impact Calculator, show me...". 4 tools are ready
Where the request belongs
Work US 409A Impact Calculator can move forward.
Finance managers and HR ops in startups who are tired of manually calculating equity math and worrying about IRS audits.
Equity Compensation Manager
Auditing new grant pools to ensure they meet FMV requirements and stay within tax bounds.
Startup Founder
Checking if a new hire's option package is legally safe before sending out an official offer.
Finance Analyst
Estimating the total tax liability for employees who might exercise early in the company's growth.
Build the capability set
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Each Connector adds new actions and data without changing how you work.
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Equip your AI agent with direct access to Carta. query cap tables, review equity grants, and monitor 409A valuations without opening the equity management dashboard.
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Estimate potential financial damages and legal liabilities for US wrongful termination claims.
Bring your own AI
Change the model, client or framework. Keep US 409A Impact Calculator connected.
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Claude -
ChatGPT -
Gemini -
Cursor -
VS Code -
Windsurf -
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Cline -
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Before you connect
Questions about US 409A Impact Calculator.
The practical details behind the request, access and result.
How does the US Section 409A Impact Calculator help with stock options?
It helps you find the lowest legal strike price you can offer while ensuring you don't trigger IRS tax penalties. It automates the math for your equity grants.
Can I use the US Section 409A Impact Calculator to check FMV compliance?
Yes, you can run a full audit on any proposed grant to see if it meets Fair Market Value standards and identify any non-compliant strike prices immediately.
Will the US Section 409A Impact Calculator calculate my company's tax bill?
It estimates the financial burden and tax penalties for specific non-compliant grants. This helps you understand the risk before you issue the options.
Does the US Section 409A Impact Calculator handle exercise windows?
Yes, it provides the specific regulatory windows and tax implications for when employees can exercise their options, helping you stay compliant.
How does the US Section 409A Impact Calculator help startups?
It prevents startups from making costly mistakes with equity. By checking strike prices against FMV, it helps you avoid massive tax hits for your early employees.
Can I use this to check ISO vs NSO rules?
Yes, the capability evaluates grant compliance based on the specific option type, ensuring you're applying the correct tax rules for ISOs and NSOs.
How can I find the minimum strike price for a new grant?
Use the calculate_minimum_strike capability 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 capability cover ISO and NSO differences?
Yes. The lookup_exercise_rules capability provides specific exercise windows and tax summaries for both ISO and NSO types.
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Give your agent a direct line to US 409A Impact Calculator.
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