Validate / normalize a schedule
API · /taxbracket-api
Tax Bracket API
healthy
4,769 Subscribers
Progressive (marginal) tax-bracket maths as an API. You supply the bracket schedule, so it works for any country, year or tax table and never goes stale, and it is entirely currency-agnostic. The tax endpoint takes an income and a schedule of threshold:rate pairs (with an optional standard deduction) and returns the total tax, the after-tax income, the effective and marginal rates, and a per-bracket breakdown showing exactly how much is taxed in each tier. The reverse endpoint solves the inverse problem — the gross income needed to take home a target net amount on the same schedule — by bisection. The brackets endpoint validates and normalizes a schedule into labelled tiers (adding a 0% tier from zero and marking the open-ended top bracket). Everything is computed locally and deterministically, so it is instant and private. It models only the schedule you provide — fold any allowances, credits or surtaxes into the brackets or the deduction yourself — and it is not tax advice. Ideal for payroll and HR tools, salary and offer calculators, fintech and budgeting apps, and any product that shows take-home pay. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is progressive-tax maths on a schedule you supply; for gross-pay period conversion use a payroll API and for loans and interest use a finance-calculator API.
api.oanor.com/taxbracket-api
API health
healthy- Uptime
- 100.00%
- Server probes · 24h
- Avg latency
- 92 ms
- Server probes · 24h
- Subscribers
- 4,769
- active
- Total calls
- 88
- last 7 days
Pricing
Pick a tier — billed monthly, cancel anytime.
Free
Free
- 10,035 calls / month
- 2 requests / second
- Hard cap (429 above quota, no overage)
- 10,035 calls/month
- 2 req/sec
- Tax + reverse + brackets
- No credit card
Starter
€11.55 /month
- 19,650 calls / month
- 8 requests / second
- Hard cap (429 above quota, no overage)
- 19.65k calls/month
- 8 req/sec
- Per-bracket breakdown + deduction
- Email support
Pro
€31.45 /month
- 246,500 calls / month
- 20 requests / second
- Hard cap (429 above quota, no overage)
- 246.5k calls/month
- 20 req/sec
- Payroll / fintech pipelines
- Priority support
Mega
€69.45 /month
- 1,275,000 calls / month
- 50 requests / second
- Hard cap (429 above quota, no overage)
- 1.275M calls/month
- 50 req/sec
- Platform scale
- Dedicated SLA
Built by
Related APIs
Other APIs with overlapping tags.
GST API
Validate and decode Indian GSTINs (the 15-character Goods & Services Tax Identification Number) instantly and entirely offline. The validate endpoint checks the structure and recomputes the official GSTIN check digit — the base-36 weighted algorithm the GSTN itself uses — and confirms the embedded state code is real, returning a clear valid/invalid verdict with the specific reasons a number fails. The decode endpoint breaks a GSTIN into its parts: the GST state/UT code and its name, the embedded 10-character PAN, the PAN holder type (company, individual/proprietor, firm/LLP, HUF, trust, government and more, read from the PAN's 4th letter), the entity registration number, the default 'Z' slot and the check digit. A states endpoint returns the full GST state-code reference for building dropdowns and lookups. Everything is pure computation — no network call, no key, no cache — so it is fast and private, ideal for checkout and onboarding forms, invoicing and e-invoice/e-way-bill pipelines, vendor master data cleansing and bulk validation. A structural GSTIN validator and decoder — distinct from EU VAT-number validation (vat), IBAN bank-account validation (iban) and card-number checks (creditcard). Note: this verifies the number's structure and check digit, not whether it is actively registered in the GSTN portal. No upstream key, no cache.
api.oanor.com/gst-api
VAT & Sales Tax API
VAT, GST and sales-tax rates for 128 countries — plus US state and Canadian province sub-rates — with a built-in tax calculator. Get the standard rate for any country (e.g. DE → 19%), compute the tax and gross total on a net amount (e.g. €100 in Germany → €19 tax, €119 total), apply a US state or Canadian province rate, or list every country. Ideal for e-commerce checkouts, invoicing, SaaS billing and pricing tools. (Standard rates, not tax advice.)
api.oanor.com/vat-api
Payroll & Salary API
Gross-pay maths as an API — the everyday salary and wage calculations, computed locally and deterministically and entirely currency-agnostic. The convert endpoint turns a pay figure given at any cadence — annual, monthly, bi-weekly, weekly, daily or hourly — into all the others, using configurable hours per week, weeks per year and days per week. The overtime endpoint computes regular, overtime (time-and-a-half by default) and double-time pay from the hours worked, with adjustable thresholds and multipliers, and reports the effective hourly rate. The raise endpoint applies a percentage or fixed raise, or works out the percentage from a new salary. The prorate endpoint pro-rates a salary by a worked fraction, or by days worked over days in the period — for joiners, leavers and part-periods. Everything is gross pay only: it deliberately excludes tax, deductions and benefits, which are jurisdiction-specific, so the maths stays exact and never goes stale. Computed locally, instant and private. Live, nothing stored. 4 endpoints. Ideal for HR and payroll tools, job boards and offer calculators, freelance and contractor rate tools, and budgeting apps. This is gross-pay maths; for loan, interest and investment maths use a finance-calculator API, and for net/take-home pay apply your local tax rules separately.
api.oanor.com/payroll-api
Currency Converter API
Live foreign-exchange conversion across 160+ world currencies — the plain, developer-friendly converter. Get the latest rates for any base currency, convert an amount between any two currencies, read the rate (and inverse) for a single pair, or list every supported currency. Rates are read live from an open exchange-rate source that aggregates a broad set of feeds and covers far more currencies than ECB-only data — including emerging-market and exotic currencies such as the Nigerian naira, Indian rupee or Vietnamese dong. This is the everyday convert / latest-rates utility a checkout, invoice, pricing page or travel app needs — distinct from the FX analytics APIs in the catalogue (historical date ranges, pip and position-size calculators, triangular-arbitrage path maths, currency indices), which compute on rates rather than simply converting them.
api.oanor.com/currencyconverter-api
Frequently asked questions
Quick answers about pricing, quotas, and integration.
How do I get an API key for Tax Bracket API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Tax Bracket API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Tax Bracket API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does Tax Bracket API cost?
Tax Bracket API has a free tier with 100 calls / month. Paid plans start at €11.55 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is Tax Bracket API GDPR-compliant?
All requests to Tax Bracket API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.
Pick an endpoint from the list on the left to see its details and try it.
Code snippets
Sign up to get an API key, then call any path under your slug.
curl https://api.oanor.com/taxbracket-api/SOME_PATH \
-H "x-oanor-key: oanor_test_..."const res = await fetch("https://api.oanor.com/taxbracket-api/SOME_PATH", {
headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();$ch = curl_init("https://api.oanor.com/taxbracket-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);import requests
r = requests.get(
"https://api.oanor.com/taxbracket-api/SOME_PATH",
headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())Ratings
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