Thirteenth Salary Calculator MCP for AI. Calculate complex payroll math in minutes.

Q: How is the proportional gross salary calculated?

The calculateproportionalgross tool calculates this by dividing your annual base salary by twelve and multiplying it by the number of full months worked in the current year.

Q: Does the calculator include tax deductions?

Yes, you can use computesocialsecuritydeduction and computeincometaxdeduction to find the specific amounts deducted from your gross salary.

Q: Can I see a full breakdown of both installments?

Yes, the getthirteenthbreakdown tool provides a complete summary including gross amount, total deductions, net amount, and details for both installments.

Claude

ChatGPT

Cursor

Gemini

Windsurf

VS Code

JetBrains

Vercel

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Thirteenth Salary Calculator calculates your 13th-month salary installment. It handles complex payroll math, determining proportional earnings based on months worked, applying progressive social security deductions, and calculating final income tax withholdings for both installments.

What your AI can do

Compute social security deduction

Calculates the required social security withholding amount for the payment.

Compute income tax deduction

Figures out the necessary income tax deduction based on salary and work period.

Calculate proportional gross

Determines the gross amount of the 13th-month pay by calculating a proportion based on months worked.

+ 1 more capabilities included

Calculate proportional gross earnings

Determines the total base salary amount based on how many months an employee worked during the year.

Compute social security deductions

Calculates mandatory contributions for social security withholding based on current law.

Compute income tax withholdings

Determines the final required amount to be deducted for federal and state income taxes.

Get full salary breakdown

Provides a complete, itemized overview of the 13th-month salary, including gross totals, all deductions, and net pay for both installments.

Ask an AI about this

Included with Plan

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AI Agent

Thirteenth Salary Calculator: A Suite of 4 Tools

Use these tools to calculate every component of the thirteenth-month salary, from gross proportional earnings down through final tax and social security deductions.

Make your AI actually useful.

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.

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Compute Social Security Deduction

Calculates the required social security withholding amount for the payment.

Compute Income Tax Deduction

Figures out the necessary income tax deduction based on salary and work period.

Calculate Proportional Gross

Determines the gross amount of the 13th-month pay by calculating a proportion based...

Get Thirteenth Breakdown

Generates a full, detailed report showing all gross amounts, deductions, and net...

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

Open Claude Settings

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

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.

Start a conversation

Open a new chat. The Thirteenth Salary Calculator integration is available immediately — no restart needed.

Antigravity

Configure Agent Environment

Open your Antigravity agent's workspace configuration or mcp-servers.json file.

Bind the Endpoint

Add the Vinkius endpoint URL to your agent's MCP connections list:

"mcp_servers": {
  "thirteenth-salary-calculator": {
    "serverUrl": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
  }
}

Provide your secure token in place of [YOUR_TOKEN_HERE] to ensure your agent requests are authenticated.

Execute

Start your Antigravity session. The agent will autonomously discover and utilize the Thirteenth Salary Calculator tools with full Vinkius guardrails applied.

VS Code Copilot

⚡

One-Click Install (Recommended)

In your Vinkius Dashboard, simply click the Add to VS Code button for this server. We'll automatically configure your local workspace.

Or configure manually

Open MCP Settings

Open VS Code, press Ctrl/Cmd + Shift + P, and search for GitHub Copilot: MCP Servers.

Add Server Config

Add the Vinkius endpoint configuration to your mcp-servers.json file:

"thirteenth-salary-calculator": {
  "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
}

Ensure you replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com.

LangChain

Install Dependencies

Install the LangChain MCP adapters for your environment:

pip install langchain-mcp-adapters

Connect the Server

Use the SSEClient in LangChain to connect to the Vinkius managed endpoint:

from langchain_mcp_adapters.client import SSEClient

# Connect to Vinkius
client = SSEClient(url="https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp")
tools = client.get_tools()

CrewAI

Define the Tool

Load the Vinkius MCP tools into your CrewAI agents:

from crewai import Agent
from mcp_crewai import MCPTool

# Connect securely to Vinkius
vinkius_tools = MCPTool(url="https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp")

# Assign to Agent
researcher = Agent(
    role='Data Researcher',
    tools=vinkius_tools.get_all()
)

Execute Task

Run your CrewAI process. The agent will autonomously route tasks to the Vinkius managed server.

Choose How to Get Started

Build a custom MCP for your own tools, or connect a ready-made integration from our catalog.

Build Your Own

Turn any API into an MCP. Import a spec, define Agent Skills, or deploy with MCPFusion.

Import from OpenAPI, Swagger, or YAML specs
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Publish to catalog or keep private

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Start with Thirteenth Salary Calculator, then connect any of our 5,100+ other servers whenever your AI needs more. One click, no limits.

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Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by Thirteenth Salary 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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Works with 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.

Payroll math used to be a nightmare of tabs and formulas.

Today, calculating 13th month pay means opening five different spreadsheets: one for proportional gross, one for SS tax, one for income tax, and two for tracking the split payments. You spend hours copying numbers between cells, making sure every deduction is applied to the correct base amount, all while praying you don't miss a progressive rate change.

With this MCP, your agent handles that whole process in background. You provide the raw inputs—salary and months worked—and it delivers the final net pay number instantly. It’s not just faster; it forces compliance by running `calculate_proportional_gross` before touching any deduction figures.

The Thirteenth Salary Calculator MCP gives you a complete payroll breakdown.

You eliminate the risk of miscalculating proportional pay and missing tax deductions. You no longer need to manually check if your SS deduction was based on the correct gross amount for only 8 months; the system handles that sequence automatically.

What’s different is that you get one single, verifiable report. It combines all elements—the initial gross figure, every required deduction like `compute_social_security_deduction`, and the final net payout split—into one actionable output.

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What your AI can actually do with this

Calculating a 13th-month paycheck is messy work. You need to account for partial years of service, then layer in multiple mandatory deductions like social security and income taxes. This MCP manages that complexity entirely. It gives you the full financial picture—gross pay, total tax withholdings, net take-home amounts, and a clear split between the first and second payments.

Instead of juggling spreadsheets or relying on siloed systems, your agent handles the entire calculation sequence in one go. You just need to provide basic inputs; the system figures out all the progressive math required for compliance. Since Vinkius hosts this MCP, you connect it once from any compatible AI client and instantly have access to sophisticated payroll logic that keeps your accounts accurate.

Built · Hosted · Managed by Vinkius Thirteenth Salary Calculator - Payroll Tax MCP

Server ID 019ee961-27c1-7047-882e-158953c075f3

Vinkius Inspector

Compliance Grade A+

Score 100/100

Report View Report ↗

Here's how it actually works

The bottom line is that you get a complete, legally structured payroll report without doing any manual math or data merging.

You start by inputting base salary data and the number of months worked. The system first uses calculate_proportional_gross to find the total gross amount.

Next, it runs the two mandatory deduction tools: compute_social_security_deduction and compute_income_tax_deduction. These subtract all required taxes from the gross total.

Finally, calling get_thirteenth_breakdown compiles everything into a single report showing the net pay for both the first and second installments.

What Changes When You Connect

Avoid manual errors by automating the entire sequence. Instead of calculating gross pay, then manually deducting taxes, you let the tool run calculate_proportional_gross first, ensuring a clean starting point for all subsequent deductions.

Guarantee compliance with tax law. It handles both social security and income tax withholding automatically. You don't have to worry about mixing up formulas or forgetting the progressive deduction steps when using compute_social_security_deduction and compute_income_tax_deduction.

Get a full picture in one go. Forget piecing together data from different sheets. The single call to get_thirteenth_breakdown gives you the net total, tax breakdown, and gross amount—all on one page.

Handle partial years easily. You don't need complex formulas for proportional pay. Just input months worked, and calculate_proportional_gross handles the scaling automatically.

Save time on reconciliation. Because it combines all steps into a single workflow, your audit trail is clean and traceable. It drastically cuts down the time spent confirming every number.

See it in action

01 01

Processing mid-year payroll adjustments

A payroll manager needs to calculate 13th salary for new hires who only worked six months this year. They ask their agent, and it uses calculate_proportional_gross first, then runs the full breakdown via get_thirteenth_breakdown. The result immediately shows accurate net pay split across two payments.

02 02

Auditing tax compliance for a client

An accountant needs to verify that both social security and income taxes were properly applied. They run the full workflow, confirming that compute_social_security_deduction and compute_income_tax_deduction are correctly linked after the proportional gross is established.

03 03

Verifying split payment amounts

An HR manager needs to show an employee exactly how their 13th salary is divided into two payments. They use get_thirteenth_breakdown, which outputs the precise net figures for November and December, matching the payroll schedule.

04 04

Calculating pay for temporary staff

A small business owner needs to run a quick estimate for part-time workers. They input low base salary data; the agent uses calculate_proportional_gross and immediately gives them an accurate tax liability estimation before running the final breakdown.

The honest tradeoffs

Calculating deductions separately

Anti-pattern

A user calculates SS tax, then runs a separate income tax calculation, and finally tries to manually combine them. The resulting net pay is wrong because the deduction bases don't feed into each other correctly.

The Fix

Always use get_thirteenth_breakdown as the final step. It’s designed to manage the dependencies: it takes the proportional gross from the start and runs both compute_social_security_deduction and compute_income_tax_deduction in the proper sequence.

Forgetting proportionality

Anti-pattern

Treating all employees as if they worked a full 12 months, which results in gross pay that is too high for part-time or new staff.

The Fix

Never skip the first step. Always let calculate_proportional_gross run first. It makes sure your base number accurately reflects the time period, so the subsequent tax tools are calculating against the correct amount.

Manual spreadsheet recalculation

Anti-pattern

Manually adjusting formulas for changes in pay scale or months worked, which is slow and prone to human error.

The Fix

Use your agent. It handles the entire process: calculate_proportional_gross sets the base; then you run the full workflow sequence via get_thirteenth_breakdown. The system does the math instantly.

When It Fits, When It Doesn't

Use this MCP if your primary need is calculating complex, regulated payroll like the 13th month salary, and accuracy in tax withholding is non-negotiable. You must have a defined base salary and know the number of months worked to get accurate results. Don't use it if you only need simple wage calculations, or if local state taxes (not covered by compute_income_tax_deduction) are mandatory for your region; in those cases, you’ll need an additional specialized tax tool. This MCP is built for the full payroll lifecycle breakdown.

Questions you might have

How is the proportional gross salary calculated? +

The calculate_proportional_gross tool calculates this by dividing your annual base salary by twelve and multiplying it by the number of full months worked in the current year.

Does the calculator include tax deductions? +

Yes, you can use compute_social_security_deduction and compute_income_tax_deduction to find the specific amounts deducted from your gross salary.

Can I see a full breakdown of both installments? +

Yes, the get_thirteenth_breakdown tool provides a complete summary including gross amount, total deductions, net amount, and details for both installments.

How does `compute_social_security_deduction` calculate deductions? +

It applies current social security law and your working period. The tool takes your base salary and the number of months worked to ensure an accurate mandatory contribution amount.

What input is required for `calculate_proportional_gross`? +

You must provide a numeric value for both the monthly salary and the total months worked. The tool processes these two key numbers directly to determine your proportional gross pay.

Can `compute_income_tax_deduction` handle different tax brackets? +

Yes, it incorporates progressive income tax rules into its calculation. This ensures that the deduction correctly reflects the total annual earnings against current withholding standards.

What if I need to calculate salary for non-standard periods using `get_thirteenth_breakdown`? +

You can specify custom start and end dates when calling this MCP. This lets you generate a full financial breakdown even if your work period doesn't align with standard payment cycles.

What happens if I submit invalid data to the Thirteenth Salary Calculator? +

If the input is malformed or missing required parameters, the MCP will return a specific error code. You should check that all provided salary and duration metrics are valid numbers.

Connect to your AI in seconds.

Compute social security deduction

Compute income tax deduction

Calculate proportional gross

Thirteenth Salary Calculator: A Suite of 4 Tools

Make your AI actually useful.

Compute Social Security Deduction

Compute Income Tax Deduction

Calculate Proportional Gross

Get Thirteenth Breakdown

Security and governance baked right in.

Claude AI

Open Claude Settings

Add Custom Connector

Start a conversation

Claude Code

Open your terminal

Add the MCP Server

Start coding

Cursor

One-Click Install (Recommended)

Open Cursor Settings

Add New Server

Use in Composer

Antigravity

Configure Agent Environment

Bind the Endpoint

Execute

VS Code Copilot

One-Click Install (Recommended)

Open MCP Settings

Add Server Config

Windsurf

One-Click Install (Recommended)

Open Windsurf Settings

Add Server Endpoint

LangChain

Install Dependencies

Connect the Server

CrewAI

Define the Tool

Execute Task

Choose How to Get Started

Build Your Own

Make Your AI Do More

Works with Claude, ChatGPT, Cursor, and more

Payroll math used to be a nightmare of tabs and formulas.

The Thirteenth Salary Calculator MCP gives you a complete payroll breakdown.

What your AI can actually do with this

Here's how it actually works

Who is this actually for?

What Changes When You Connect

See it in action

Processing mid-year payroll adjustments

Auditing tax compliance for a client

Verifying split payment amounts

Calculating pay for temporary staff

The honest tradeoffs

Calculating deductions separately

Forgetting proportionality

Manual spreadsheet recalculation

When It Fits, When It Doesn't

Questions you might have