How to Look Up Tax Brackets with Claude
Look up tax brackets with Claude and ToolRouter. Current federal income tax rates and bracket calculations.
Tool
Claude looks up the current brackets and immediately applies them to your actual situation. Tell it your income and filing status and it calculates your marginal rate, effective rate, and the tax owed at each bracket level — then answers follow-up questions like what additional income would cost you in taxes or how much you would save by contributing more to a pre-tax retirement account.
Connect ToolRouter to Claude
1Open connector settings Open Settings
2Add a custom connector with these details
Name
ToolRouterURL
https://api.toolrouter.com/mcp3Let Claude set you up Open Claude
Steps
Once connected (see setup above), use the Tax Reference tool:
- Ask Claude: "What are the current federal income tax brackets for married filing jointly?"
- Claude returns the current year brackets with thresholds
- Ask: "What is my effective tax rate on $185,000 of taxable income?"
- Ask: "How much more tax would I owe if I earned an additional $20,000?"
Example Prompt
Try this with Claude using the Tax Reference tool
I am single with $140,000 of taxable income. What is my marginal tax rate, effective tax rate, and total federal tax owed using the current brackets? Show the bracket-by-bracket breakdown.
Tips
- Ask about the bracket just above your income to understand the exact cost of additional earnings
- Compare effective rates for single versus married filing jointly to understand the marriage penalty or bonus
- Ask Claude to calculate how much pre-tax retirement contribution would drop you into the next lower bracket