Quarterly Tax Calculator
美国自雇人士季度预估税免费MCP服务器。estimateQuarterlyTax根据年度净利润、申报状态、州和纳税年度（2025/2026，支持QBI）计算联邦和州所得税、自雇税以及4个季度分期付款；getPaymentCalendar返回4个IRS季度截止日期，已顺延周末和IRS假日。远程端点：https://mcp.quarterlytax.al157.xyz/mcp（Streamable HTTP，无需认证）。只读计算；不存储数据。
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Your numbers
Business revenue minus expenses — the profit you report.
State tax is a rough estimate — graduated marginal brackets for CA, NY, NJ, HI and OR; single approximate marginal rate elsewhere.
§199A simplified estimate — assumes a non-SSTB business with no W-2 wages paid. Thresholds follow the selected tax year.
tax-rules: 2026 federal states 2025 Rates verified for tax year 2026 — rates change yearly, IRS figures govern. State estimates: 2025 data.
Federal / quarter
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State / quarter
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Safe harbor comparison
Payment calendar
Pay via IRS Direct Pay ↗ Pay via EFTPS ↗
Due dates follow the IRS rule: a date falling on a weekend or legal holiday moves to the next business day. Always confirm on irs.gov before paying.