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US Freelancer Tax Calculator 2026

Registre officiel Finance et paiements

2026 US freelancer tax: quarterly estimates, SE tax, mileage, home office, SEP/401(k), per diem.

Code source Documentation

Installation

Ajoutez ceci à la configuration MCP de votre client (Claude Desktop : claude_desktop_config.json ; Cursor : .cursor/mcp.json ; VS Code et les autres utilisent la même forme « mcpServers »).

NPM package freelance-tax-mcp
Claude Code 
claude mcp add us-freelancer-tax-calculator-2026 -- npx -y freelance-tax-mcp@1.2.0
Configuration JSON (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "us-freelancer-tax-calculator-2026": {
            "command": "npx",
            "args": [
                "-y",
                "freelance-tax-mcp@1.2.0"
            ]
        }
    }
}

Documentation

Tirée du README du projet sur GitHub, actualisée chaque semaine. Les liens ouvrent GitHub.

Sommaire
  1. freelance-tax-mcp
  2. Tools
  3. Install
  4. Example
  5. Prefer a web page?
  6. License

freelance-tax-mcp

A free Model Context Protocol (MCP) server for US freelancer and sole-proprietor taxes in 2026: quarterly estimated tax with the safe harbor, self-employment tax, IRS due dates, the IRS mileage deduction (including the July 1, 2026 rate change) the home office deduction, and the most you can put into a SEP IRA vs a Solo 401(k). Everything runs locally: no API key, no account, no network calls.

Tools

ToolWhat it does
estimate2026 federal estimate from net_profit (or ytd_profit + months): SE tax, income tax, QBI, safe-harbor quarterly payment and due dates. Options filing_status, w2_wages, withholding, prior_year_tax, prior_year_agi, state_rate_pct.
self_employment_taxSocial Security and Medicare tax on net profit, the deductible half and Additional Medicare Tax.
due_datesQuarterly estimated tax due dates for a year, moved past weekends and DC legal holidays.
mileageStandard mileage deduction priced by the date of each trip (business 72.5 cents Jan to Jun 2026, 76 cents from Jul 1), from a trip log or split totals.
mileage_ratesIRS mileage rates by period with sources.
home_officeSimplified ($5 per sq ft, up to 300 sq ft) vs regular Form 8829 method, with the income limit and carryovers.
retirement_contribution2026 SEP IRA vs Solo 401(k) maximum contribution for a sole proprietor or single-member LLC (IRS Pub. 560 rate worksheet): employer share, $24,500 deferral, catch-up ($8,000 at 50+, $11,250 at 60 to 63), the $72,000 cap, which plan allows more and estimated income tax saved. Options age_group, w2_wages, other_deferrals, plan_rate, bracket.
tax_figures2026 brackets, standard deductions, SE tax figures and official IRS/SSA sources.

Figures come from IRS Rev. Proc. 2025-32, the SSA 2026 wage base ($184,500), Form 1040-ES (2026), IRS Announcement 2026-11, Pub. 587, Pub. 560 and IRS Notice 2025-67 (2026 retirement plan limits). Planning estimates only; not tax, legal or accounting advice.

Install

Requires Node.js 18 or newer.

npx -y freelance-tax-mcp

Add to your MCP client's config (for Cursor, ~/.cursor/mcp.json):

{
  "mcpServers": {
    "freelance-tax": { "command": "npx", "args": ["-y", "freelance-tax-mcp"] }
  }
}

From source: git clone https://github.com/NarwhalThePong/freelance-tax-mcp.git && cd freelance-tax-mcp && npm install && npm test.

Example

estimate with { "net_profit": 80000 } (single, no other income) returns self-employment tax of $11,303.64, total 2026 federal tax of $16,647.47 and a quarterly payment of $4,161.87, with the four due dates.

retirement_contribution with { "net_profit": 100000 } (under 50) returns a SEP IRA maximum of $18,587.04 and a Solo 401(k) maximum of $43,087.04 ($24,500 deferral + $18,587.04 employer share).

Prefer a web page?

Disclosure: these are our own free pages.

License

MIT

Questions fréquentes

Qu'est-ce que US Freelancer Tax Calculator 2026 ?

2026 US freelancer tax: quarterly estimates, SE tax, mileage, home office, SEP/401(k), per diem.

Comment installer US Freelancer Tax Calculator 2026 ?

Il s'exécute sur votre machine. Dans Claude Code : claude mcp add us-freelancer-tax-calculator-2026 -- npx -y freelance-tax-mcp@1.2.0. Pour les autres clients, collez la configuration JSON de cette page dans leurs réglages MCP.

Faut-il une clé API pour US Freelancer Tax Calculator 2026 ?

Son entrée au registre n'indique aucune clé ni secret obligatoire. Certaines fonctions peuvent tout de même demander un compte auprès du service auquel il se connecte.

US Freelancer Tax Calculator 2026 est-il open source ?

Oui. Son code est sur GitHub sous licence MIT.

Qui maintient US Freelancer Tax Calculator 2026 ?

Il est publié par NarwhalThePong. AI.tn le référence sans le maintenir ni le recommander.

Issu du registre MCP officiel. Être listé n'est pas une recommandation : vérifiez le code et les permissions d'un serveur avant de lui donner accès à vos données.