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Can Claude look up the 2027 tax brackets?

Yes with web search, with one caution. The IRS announced the 2027 tax brackets and standard deduction on November 5, 2026, so from training data alone Claude may give the 2026 numbers. With web search on, Claude can find the IRS page, but articles written before the announcement may show projected figures. Connect the free 2027 Tax Brackets and Standard Deduction server and Claude reads a table copied from IRS Revenue Procedure 2026-35 when you ask. It gives the brackets for your filing status, the standard deduction with the extra for age 65 or blindness, and the federal income tax on an income under 2027 and 2026 rules, so you can see what the change saves. It also covers the capital gains thresholds, the child tax credit and the earned income credit. It leaves out state tax, credits and self-employment tax.

Connect free, no token 2027 tax brackets MCP server

What Claude does alone, and what needs the server

Claude on its own

  • Explains how marginal brackets work and does the arithmetic once it has the thresholds.
  • Finds the IRS announcement when web search is on.

With the 2027 Tax Brackets and Standard Deduction server

  • The 2027 thresholds for each bracket and filing status from IRS Revenue Procedure 2026-35.
  • The 2027 standard deduction, with the extra for age 65 or older or blindness, beside the 2026 figure.
  • The tax on a given income under 2027 and 2026 rules, with the bracket by bracket breakdown.

A real call to the live server

We sent this to the hosted server on 2026-11-07. The answer below is the server's own text, not a mock-up. Live values will differ when you ask.

You ask

What are the 2027 tax brackets for a married couple filing jointly?

Tool call

get_tax_brackets {"filing_status":"married_filing_jointly"}

Server answer

2027 federal income tax brackets (Rev. Proc. 2026-35, announced 2026-11-05, for taxable years beginning in 2027 (returns filed in 2028)). Married filing jointly: 10% $0 to $25,600, 12% $25,600 to $104,050, 22% $104,050 to $218,250, 24% $218,250 to $416,650, 32% $416,650 to $529,100, 35% $529,100 to $793,650, 37% over $793,650. These are taxable income thresholds, after the standard or itemized deduction.

Run on 2026-11-07. The thresholds are a dated table copied from the IRS revenue procedure, so they do not change unless the IRS or Congress changes them.

You ask

How much federal income tax do I owe in 2027 on $100,000 as a single filer, and how does that compare with 2026?

Tool call

calculate_federal_income_tax {"filing_status":"single","income":100000}

Server answer

2027 federal income tax for single on $100,000 of income less a $16,600 deduction (taxable income $83,400) is $12,889.50. The marginal rate is 22% and the average rate is 12.89% of income. Under 2026 rules the same facts give $13,170, so the 2027 tax is $280.50 lower. This is federal income tax only. It leaves out credits, self-employment tax, net investment income tax, the alternative minimum tax and state tax.

Connect it in 1 minute

One URL, no token, no account. In Claude.ai or Claude Desktop open Settings, then Connectors, then Add custom connector, and paste the URL.

Connector URL

https://tax-brackets-standard-deduction-2027-mcp.lipmichal.workers.dev/mcp

Claude Code

claude mcp add --transport http tax-brackets-standard-deduction-2027 https://tax-brackets-standard-deduction-2027-mcp.lipmichal.workers.dev/mcp

Cursor (~/.cursor/mcp.json)

{
  "mcpServers": {
    "tax-brackets-standard-deduction-2027": {
      "url": "https://tax-brackets-standard-deduction-2027-mcp.lipmichal.workers.dev/mcp"
    }
  }
}

VS Code (.vscode/mcp.json)

{
  "servers": {
    "tax-brackets-standard-deduction-2027": {
      "type": "http",
      "url": "https://tax-brackets-standard-deduction-2027-mcp.lipmichal.workers.dev/mcp"
    }
  }
}

All 4 tools, sources and more prompts are on the 2027 tax brackets MCP server page.

Questions

Can Claude look up the 2027 tax brackets?
Yes with web search, with one caution. The IRS announced the 2027 tax brackets and standard deduction on November 5, 2026, so from training data alone Claude may give the 2026 numbers. With web search on, Claude can find the IRS page, but articles written before the announcement may show projected figures. Connect the free 2027 Tax Brackets and Standard Deduction server and Claude reads a table copied from IRS Revenue Procedure 2026-35 when you ask. It gives the brackets for your filing status, the standard deduction with the extra for age 65 or blindness, and the federal income tax on an income under 2027 and 2026 rules, so you can see what the change saves. It also covers the capital gains thresholds, the child tax credit and the earned income credit. It leaves out state tax, credits and self-employment tax.
Do these numbers apply to my 2026 tax return?
No. The 2027 brackets apply to income earned in 2027 and to returns filed in 2028. A return filed in 2027 for 2026 uses the 2026 brackets, which the server also holds.
Can Congress change the numbers?
Yes. The revenue procedure says that if Congress amends the Code after its release, taxpayers should look for further IRS guidance. The server holds the figures as the IRS announced them on November 5, 2026.
Is the server free?
Yes. The 2027 Tax Brackets and Standard Deduction server is free at its hosted URL with no token, key or account. The source is open on GitHub.

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