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Connect US Quarterly Tax Estimator to ChatGPT and Claude

Set it up once and it works in ChatGPT, Claude, Cursor, and any other client you love. It all runs safely in the background, so you can relax and focus on what really matters. Calculate precise federal tax payments and deadlines.

Ask AI about this Connector

Developed, maintained, and hosted by Vinkius.

MCP VERIFIED · PRODUCTION READY · VINKIUS GUARANTEED

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Works with modern AI clients that support MCP, including ChatGPT, Claude, Cursor, and more.

ChatGPTClaudeCursorPerplexityGeminiMicrosoft CopilotRaycastMeta AI

Your AI does the work. We keep it safe and sound.

No other AI tool gives you this. Your workflow runs in the client you already love, your account stays protected, and you decide what the agent can and cannot do. It is the whole reason to make the switch.

Each Connector lives inside our infrastructure, the same place where your workflow runs. The three things below are already part of it, working quietly in the background so you never have to think about them. Nothing to add, nothing to set up, nothing to worry about.

A futuristic MCP client docking bay
V8 Isolate01

Each Connector runs inside its own sealed environment.

Each Connector runs inside its own sealed V8 runtime — no access to your files, your system, or other servers. A Connector never sees past its own request.

Kill Switch02

One switch stops every agent. Instantly.

One action deactivates every Connector, revokes every token, and ends every session at once. AI Governance keeps the record.

FinOps per User03

Spending limits that pause instead of surprise.

Every user keeps their own connections and credentials, isolated from everyone else. Anything that would cross your spending limit is held for your approval, not billed.

Three controls, built into the layer your AI connects through.

Curated set · 3 capabilities

We ship only the actions that matter.

Capability set01 / 01

01-03

3 capabilities in this set.

Part of 3 available through US Quarterly Tax Estimator.

  1. 01

    Estimate quarterly payments

    This capability calculates your required US quarterly tax installments. It generates a schedule of four specific payment amounts and their due dates.

  2. 02

    Evaluate safe harbor compliance

    This capability checks if your current tax payments meet Safe Harbor requirements. It compares your withholdings against the 90% or 110% thresholds to help avoid penalties.

  3. 03

    Calculate marginal tax bracket

    This capability determines your top federal tax bracket. It identifies the specific percentage rate for your given income level.

Real work

What teams actually run

01

Quarterly Planning

An agent calculates four specific payment amounts for a freelancer based on their projected annual earnings.

02

Penalty Prevention

A user checks if their current year withholdings meet the 90% Safe Harbor rule.

03

Income Projections

An agent determines the marginal tax bracket for a business owner seeing a sudden increase in revenue.

04

Tax Deadline Tracking

The agent provides a schedule of the four quarterly deadlines to ensure timely payments.

Automate a task

Put US Quarterly Tax Estimator to work on one thing.

Step-by-step automations your AI runs through this Connector: the workflow, the prompts to start with, and the exact capabilities behind each move.

One connector, every AI

US Quarterly Tax Estimator works with the most popular AI clients.

These are the most popular clients, each with a step-by-step guide: one link, set up once, with governance and visibility built in. And because everything runs on the MCP standard, the same connection also works in any other compatible client — nothing to rebuild.

ClaudeClaudeChatGPTChatGPTGeminiGeminiPerplexityPerplexityGrokGrokMicrosoft CopilotMicrosoft CopilotCursorCursorVS CodeVS CodeWindsurfWindsurfJetBrainsJetBrainsClineClineLangChainLangChainVercel AI SDKVercel AI SDKLovableLovableZ.aiZ.aiRaycastRaycastQwen CodeQwen CodeKimi CodeKimi CodeLe ChatLe Chat

Building your own app? The connector is yours to use.

You don't need a client to put US Quarterly Tax Estimator to work: the same hosted connection plugs into your own applications and agent code, with the same governance on every request. Build with it, chat with it — one connection for both.

Observed, not estimated

750ms average. Fast in production.

US Quarterly Tax Estimator is checked daily against the live service.

Daily averagePeak 1130ms
Oct 3Today
Fastest day
534ms
Slowest day
1130ms
14-day trend
Slowing+5%

Connect your client

One URL. Every client.

Activate the Connector, copy your link, and paste it into the client you already use. 3 capabilities arrive ready to run.

Preview access · not provider authentication

The vk_preview_* token belongs to Vinkius preview infrastructure. It lets Claude discover and display the capabilities of US Quarterly Tax Estimator, so you can see the experience inside your AI.

It does not authenticate your account with US Quarterly Tax Estimator. Actions requiring credentials or live account data may not run until you activate the Connector and authorize the service.

US Quarterly Tax Estimator Connector

You're all set. Choose your MCP client and follow the setup instructions.

Connector linkhttps://edge.vinkius.com/vk_preview_qehiiamMpd2GzZXdM8aLWjQwAKKJUu39dVPRg0ZU/mcp

Claude Desktop

Follow the steps below to connect in seconds.

  1. 1In Claude Desktop, open Settings → Connectors.
  2. 2Click “Add custom connector” and paste the connector link above as the remote MCP server URL.
  3. 3Click Add and start a new chat — US Quarterly Tax Estimator capabilities are ready to use.
Configuration · claude_desktop_config.jsonCopy
{
  "mcpServers": {
    "us-quarterly-tax-estimator-mcp": {
      "url": "https://edge.vinkius.com/vk_preview_qehiiamMpd2GzZXdM8aLWjQwAKKJUu39dVPRg0ZU/mcp"
    }
  }
}
  • Claude
  • ChatGPT
  • Cursor
  • VS Code
  • Windsurf
  • Claude Code
  • JetBrains
  • Cline

Step-by-step instructions for each client are in the guide. How to connect

Guided setup for Claude? Set up US Quarterly Tax Estimator in Claude and other AIs

See all the AI clients this connector works with ↑

Who it's for

Built for the work US Quarterly Tax Estimator owners hand off.

This MCP is built for anyone managing self-employment income or complex tax obligations through an AI agent.

  • 01

    Freelancers

    They hand off income projections to the agent to get exact quarterly payment amounts.

  • 02

    Small Business Owners

    They use the agent to verify if their withholdings meet Safe Harbor requirements.

  • 03

    Tax Professionals

    They use the agent to quickly run marginal tax bracket calculations for clients.

FAQ

Questions US Quarterly Tax Estimator owners ask.

  • 01

    How does this MCP help with quarterly taxes?

    It provides capabilities for your agent to calculate Form 1040-ES payments, identify tax brackets, and check Safe Harbor compliance.

  • 02

    Can I use this with Claude or Cursor?

    Yes, you can connect this MCP to any compatible client including Claude, Cursor, and Windsurf.

  • 03

    What is Safe Harbor compliance?

    It is a rule that allows you to avoid underpayment penalties if your withholdings meet certain thresholds, such as 90% of current tax or 110% of prior year tax.

  • 04

    Does this calculate my total annual tax?

    The capabilities focus on quarterly estimated payments, marginal tax brackets, and Safe Harbor compliance rather than a full annual tax return.

  • 05

    Do I need to host this myself?

    No, Vinkius hosts and manages the MCP so it is ready to use immediately after you connect your client.

  • 06

    How can I find my quarterly payment deadlines?

    Use the estimate_quarterly_payments capability. It returns a list of all four quarterly deadlines along with the specific amount due for each period.

  • 07

    What is the Safe Harbor rule?

    The Safe Harbor rule allows you to avoid underpayment penalties by paying either 90% of your current year's tax or 100% (or 110% for high earners) of your prior year's tax.

  • 08

    Can I check if my current payments are enough to avoid penalties?

    Yes. The evaluate_safe_harbor_compliance capability compares your total paid to date against the required Safe Harbor thresholds.

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