deepcalc-data

Open tax rate data: JSON files, npm package, and Claude plugin.

Part of deepcalc.com - tax and financial calculators.

datasets

• data/us-federal-tax/ - federal income tax brackets, standard deductions, FICA (2025-2026)
• data/eu-vat/ - VAT rates for all 27 EU member states
• data/us-sales-tax/ - sales tax rates and exemptions for 10 US states

each dataset folder includes a _source.md documenting data origins, update frequency, and automation feasibility.

public site

data.deepcalc.com - public reference site generated from this data.

packages

• packages/npm/tax-rates/ - @deepcalc/tax-rates npm package
• packages/claude/deepcalc-tax/ - Claude plugin with tax rate skills

npm package usage

import { getFederalBrackets, getSalesTaxRate, getVATRate } from '@deepcalc/tax-rates';

const brackets = getFederalBrackets(2026, 'single');
const ca = getSalesTaxRate('CA');
const de = getVATRate('DE');

data sources

all data sourced from official government publications:

• IRS (Rev. Proc. 2024-40, One Big Beautiful Bill Act)
• European Commission, OECD
• Tax Foundation
• state departments of revenue

see _source.md in each data directory for specific URLs.

license

MIT