Check Capital Gains Tax Rates
Look up current long-term and short-term capital gains rates by income level and filing status.
Look Up Tax Brackets
Get current federal income tax brackets and calculate marginal and effective rates for any income level.
Quick answer: Use the Tax Reference tool through ToolRouter to look up tax brackets directly from Claude, ChatGPT, Microsoft Copilot, and OpenClaw — connect once, then drive it with plain-language prompts. No code required.
ToolTax brackets change every year with inflation adjustments, and most people have no idea where the thresholds currently sit. The difference between knowing your marginal rate and guessing it can mean badly structured compensation, wrong withholding, or missed income-shifting opportunities that push dollars into a lower bracket.
Tax Reference provides the current year's federal income tax brackets for all filing statuses. Enter an income level and it returns the marginal rate, the effective rate, and a breakdown of how much tax falls in each bracket — the full picture, not just the top rate.
Financial planners, HR teams calculating withholding, and individuals approaching a bracket boundary use this to make rate-informed decisions rather than working from memory or last year's numbers.
How to look up tax brackets with Claude, ChatGPT, Microsoft Copilot, and OpenClaw
Connect ToolRouter
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
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.
How to look up tax brackets
Once connected (see setup above), use the Tax Reference tool — the same steps work with Claude, ChatGPT, Microsoft Copilot, OpenClaw, and any MCP client:
- 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 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
Frequently Asked Questions
How do I look up tax brackets with an AI assistant?
Get current federal income tax brackets and calculate marginal and effective rates for any income level. Connect the Tax Reference tool to Claude, ChatGPT, Microsoft Copilot, and OpenClaw through ToolRouter, then ask the assistant in plain language. For example: Ask Claude: "What are the current federal income tax brackets for married filing jointly?" Claude returns the current year brackets with thresholds
Which AI assistants can look up tax brackets?
Claude, ChatGPT, Microsoft Copilot, and OpenClaw can all look up tax brackets using the Tax Reference tool through ToolRouter, with no API keys or coding required.
What does the Tax Reference tool do?
Look up current US tax brackets, capital gains rates, retirement contribution limits, and depreciation schedules.
Related Use Cases
Look Up Retirement Contribution Limits
Get the current year contribution limits for 401(k), IRA, HSA, and other tax-advantaged retirement accounts.