Overview
Income Tax Brackets works by aggregating federal income tax data from official sources including the Tax Foundation and IRS publications. Data covers all filing statuses (single, married filing jointly, married filing separately, head of household) with historical data back to 2000.
Endpoint
One host, one path per API. The block below shows this call in four languages; every one of them is the same HTTP request. Making requests covers the timeouts, retries and parameter rules that apply to all of them. The SDKs wrap the same call in a typed client.
curl "https://api.apiverve.com/v1/incometax?country=US&year=2024" \
-H "x-api-key: your_api_key_here"const res = await fetch('https://api.apiverve.com/v1/incometax?country=US&year=2024', {
headers: { 'x-api-key': 'your_api_key_here' },
});
if (!res.ok) throw new Error(`${res.status} ${await res.text()}`);
const { data } = await res.json();
console.log(data);import requests
res = requests.get(
"https://api.apiverve.com/v1/incometax?country=US&year=2024",
headers={"x-api-key": "your_api_key_here"},
timeout=15,
)
res.raise_for_status()
print(res.json()["data"])package main
import (
"fmt"
"io"
"net/http"
)
func main() {
req, _ := http.NewRequest("GET", "https://api.apiverve.com/v1/incometax?country=US&year=2024", nil)
req.Header.Set("x-api-key", "your_api_key_here")
res, err := http.DefaultClient.Do(req)
if err != nil {
panic(err)
}
defer res.Body.Close()
out, _ := io.ReadAll(res.Body)
fmt.Println(string(out))
}Replace your_api_key_here with the key from your dashboard. When the inputs arrive as a list rather than one at a time, batch requests run up to 200 of them through this same API in a single call.
Authentication
Send your key in the x-api-key header. That is the only auth step — there is no token exchange and no per-endpoint scope to configure. Authentication covers creating, rotating and revoking keys.
401 is the only auth verdict
A 401 means the key is missing, invalid or expired. A 403 means the key is valid but not permitted here — blocked by a key restriction or an IP allow-list. Running out of credits is a 429.
Parameters
Sent in the query string. Premium parameters are accepted on every plan but only take effect on plans that include them.
| Parameter | Type | Description |
|---|---|---|
countryRequired | string | The country code (currently only 'US' is supported) length 2–2 |
yearOptionalPremium | integer | The tax year to retrieve brackets for. Defaults to the previous year. range 2000–2030 |
Response
Every API returns the same three top-level keys, so one response handler covers your whole integration: status, error and data. Only data changes shape. Response format covers the envelope, the other output formats and how premium fields are withheld.
{
"status": "ok",
"error": null,
"data": {
"year": 2025,
"country": "US",
"type": "federal",
"brackets": {
"single": [
{
"rate": 0.1,
"min": 0,
"max": 11924
},
{
"rate": 0.12,
"min": 11925,
"max": 48474
},
{
"rate": 0.22,
"min": 48475,
"max": 103349
},
{
"rate": 0.24,
"min": 103350,
"max": 197299
},
{
"rate": 0.32,
"min": 197300,
"max": 250524
},
{
"rate": 0.35,
"min": 250525,
"max": 626349
},
{
"rate": 0.37,
"min": 626350,
"max": 999999999
}
],
"married_filing_jointly": [
{
"rate": 0.1,
"min": 0,
"max": 23849
},
{
"rate": 0.12,
"min": 23850,
"max": 96949
},
{
"rate": 0.22,
"min": 96950,
"max": 206699
},
{
"rate": 0.24,
"min": 206700,
"max": 394599
},
{
"rate": 0.32,
"min": 394600,
"max": 501049
},
{
"rate": 0.35,
"min": 501050,
"max": 751599
},
{
"rate": 0.37,
"min": 751600,
"max": 999999999
}
],
"married_filing_separately": [
{
"rate": 0.1,
"min": 0,
"max": 11924
},
{
"rate": 0.12,
"min": 11925,
"max": 48474
},
{
"rate": 0.22,
"min": 48475,
"max": 103349
},
{
"rate": 0.24,
"min": 103350,
"max": 197299
},
{
"rate": 0.32,
"min": 197300,
"max": 250524
},
{
"rate": 0.35,
"min": 250525,
"max": 375799
},
{
"rate": 0.37,
"min": 375800,
"max": 999999999
}
],
"head_of_household": [
{
"rate": 0.1,
"min": 0,
"max": 16999
},
{
"rate": 0.12,
"min": 17000,
"max": 64849
},
{
"rate": 0.22,
"min": 64850,
"max": 103349
},
{
"rate": 0.24,
"min": 103350,
"max": 197299
},
{
"rate": 0.32,
"min": 197300,
"max": 250499
},
{
"rate": 0.35,
"min": 250500,
"max": 626349
},
{
"rate": 0.37,
"min": 626350,
"max": 999999999
}
]
},
"standard_deduction": {
"single": 15000,
"married_filing_jointly": 30000,
"married_filing_separately": 15000,
"head_of_household": 22500
},
"lastUpdated": "2026-02-07T06:02:41.898Z",
"marriagePenalty": {
"appliesFromRate": 0.37,
"singleThreshold": 626350,
"jointThreshold": 751600,
"jointShortfall": 501100
},
"effectiveRateCurve": {
"single": [
{
"income": 25000,
"taxableIncome": 10000,
"tax": 1000,
"effectiveRate": 0.04,
"marginalRate": 0.1
},
{
"income": 50000,
"taxableIncome": 35000,
"tax": 3961.4,
"effectiveRate": 0.0792,
"marginalRate": 0.12
},
{
"income": 100000,
"taxableIncome": 85000,
"tax": 13613.78,
"effectiveRate": 0.1361,
"marginalRate": 0.22
},
{
"income": 250000,
"taxableIncome": 235000,
"tax": 52262.32,
"effectiveRate": 0.209,
"marginalRate": 0.32
},
{
"income": 1000000,
"taxableIncome": 985000,
"tax": 321468.9,
"effectiveRate": 0.3215,
"marginalRate": 0.37
}
],
"married_filing_jointly": [
{
"income": 25000,
"taxableIncome": 0,
"tax": 0,
"effectiveRate": 0,
"marginalRate": 0.1
},
{
"income": 50000,
"taxableIncome": 20000,
"tax": 2000,
"effectiveRate": 0.04,
"marginalRate": 0.1
},
{
"income": 100000,
"taxableIncome": 70000,
"tax": 7922.9,
"effectiveRate": 0.0792,
"marginalRate": 0.12
},
{
"income": 250000,
"taxableIncome": 220000,
"tax": 38493.56,
"effectiveRate": 0.154,
"marginalRate": 0.24
},
{
"income": 1000000,
"taxableIncome": 970000,
"tax": 282961.15,
"effectiveRate": 0.283,
"marginalRate": 0.37
}
],
"married_filing_separately": [
{
"income": 25000,
"taxableIncome": 10000,
"tax": 1000,
"effectiveRate": 0.04,
"marginalRate": 0.1
},
{
"income": 50000,
"taxableIncome": 35000,
"tax": 3961.4,
"effectiveRate": 0.0792,
"marginalRate": 0.12
},
{
"income": 100000,
"taxableIncome": 85000,
"tax": 13613.78,
"effectiveRate": 0.1361,
"marginalRate": 0.22
},
{
"income": 250000,
"taxableIncome": 235000,
"tax": 52262.32,
"effectiveRate": 0.209,
"marginalRate": 0.32
},
{
"income": 1000000,
"taxableIncome": 985000,
"tax": 326479.9,
"effectiveRate": 0.3265,
"marginalRate": 0.37
}
],
"head_of_household": [
{
"income": 25000,
"taxableIncome": 2500,
"tax": 250,
"effectiveRate": 0.01,
"marginalRate": 0.1
},
{
"income": 50000,
"taxableIncome": 27500,
"tax": 2959.9,
"effectiveRate": 0.0592,
"marginalRate": 0.12
},
{
"income": 100000,
"taxableIncome": 77500,
"tax": 10224.78,
"effectiveRate": 0.1022,
"marginalRate": 0.22
},
{
"income": 250000,
"taxableIncome": 227500,
"tax": 48123.32,
"effectiveRate": 0.1925,
"marginalRate": 0.32
},
{
"income": 1000000,
"taxableIncome": 977500,
"tax": 316955.65,
"effectiveRate": 0.317,
"marginalRate": 0.37
}
]
},
"changes": {
"versusYear": 2024,
"indexingPercent": 2.794,
"bracketShifts": {
"single": [
{
"rate": 0.12,
"from": 11600,
"to": 11925,
"shiftPercent": 2.802
},
{
"rate": 0.22,
"from": 47150,
"to": 48475,
"shiftPercent": 2.81
},
{
"rate": 0.24,
"from": 100525,
"to": 103350,
"shiftPercent": 2.81
},
{
"rate": 0.32,
"from": 191950,
"to": 197300,
"shiftPercent": 2.787
},
{
"rate": 0.35,
"from": 243725,
"to": 250525,
"shiftPercent": 2.79
},
{
"rate": 0.37,
"from": 609350,
"to": 626350,
"shiftPercent": 2.79
}
],
"married_filing_jointly": [
{
"rate": 0.12,
"from": 23200,
"to": 23850,
"shiftPercent": 2.802
},
{
"rate": 0.22,
"from": 94300,
"to": 96950,
"shiftPercent": 2.81
},
{
"rate": 0.24,
"from": 201050,
"to": 206700,
"shiftPercent": 2.81
},
{
"rate": 0.32,
"from": 383900,
"to": 394600,
"shiftPercent": 2.787
},
{
"rate": 0.35,
"from": 487450,
"to": 501050,
"shiftPercent": 2.79
},
{
"rate": 0.37,
"from": 731200,
"to": 751600,
"shiftPercent": 2.79
}
],
"married_filing_separately": [
{
"rate": 0.12,
"from": 11600,
"to": 11925,
"shiftPercent": 2.802
},
{
"rate": 0.22,
"from": 47150,
"to": 48475,
"shiftPercent": 2.81
},
{
"rate": 0.24,
"from": 100525,
"to": 103350,
"shiftPercent": 2.81
},
{
"rate": 0.32,
"from": 191950,
"to": 197300,
"shiftPercent": 2.787
},
{
"rate": 0.35,
"from": 243725,
"to": 250525,
"shiftPercent": 2.79
},
{
"rate": 0.37,
"from": 365600,
"to": 375800,
"shiftPercent": 2.79
}
],
"head_of_household": [
{
"rate": 0.12,
"from": 16550,
"to": 17000,
"shiftPercent": 2.719
},
{
"rate": 0.22,
"from": 63100,
"to": 64850,
"shiftPercent": 2.773
},
{
"rate": 0.24,
"from": 100500,
"to": 103350,
"shiftPercent": 2.836
},
{
"rate": 0.32,
"from": 191950,
"to": 197300,
"shiftPercent": 2.787
},
{
"rate": 0.35,
"from": 243700,
"to": 250500,
"shiftPercent": 2.79
},
{
"rate": 0.37,
"from": 609350,
"to": 626350,
"shiftPercent": 2.79
}
]
},
"standardDeduction": {
"single": {
"from": 14600,
"to": 15000,
"change": 400,
"changePercent": 2.74
},
"married_filing_jointly": {
"from": 29200,
"to": 30000,
"change": 800,
"changePercent": 2.74
},
"married_filing_separately": {
"from": 14600,
"to": 15000,
"change": 400,
"changePercent": 2.74
},
"head_of_household": {
"from": 21900,
"to": 22500,
"change": 600,
"changePercent": 2.74
}
}
}
}
}Response fields
Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.
| Field | Type | Example | Description |
|---|---|---|---|
year | number | 2025 | Tax year for the bracket data |
country | string | "US" | Country code for tax data |
type | string | "federal" | Which tax the brackets describe, such as federal |
brackets | object | {...} | Array of tax brackets with rates and income ranges |
single | array[7] | Rate bands for a single filer | |
rate | number | 0.1 | Marginal rate for the band |
min | number | 0 | Income at which the band starts |
max | number | 11924 | Income at which the band ends; null for the top band |
married_filing_jointly | array[7] | Rate bands for married filers filing jointly | |
rate | number | 0.1 | Marginal rate for the band |
min | number | 0 | Income at which the band starts |
max | number | 23849 | Income at which the band ends; null for the top band |
married_filing_separately | array[7] | Rate bands for married filers filing separately | |
rate | number | 0.1 | Marginal rate for the band |
min | number | 0 | Income at which the band starts |
max | number | 11924 | Income at which the band ends; null for the top band |
head_of_household | array[7] | Rate bands for a head of household filer | |
rate | number | 0.1 | Marginal rate for the band |
min | number | 0 | Income at which the band starts |
max | number | 16999 | Income at which the band ends; null for the top band |
standard_deduction | object | {...} | Standard deduction amounts by filing status |
single | number | 15000 | |
married_filing_jointly | number | 30000 | |
married_filing_separately | number | 15000 | |
head_of_household | number | 22500 | |
lastUpdated | string | "2026-02-07T06:02:41.898Z" | When the bracket table was last refreshed |
marriagePenaltyPremium | object | {...} | Where filing jointly stops being worth twice a single filer's thresholds; null when the schedule doubles all the way up |
appliesFromRatePremium | number | 0.37 | The rate band at which the doubling first breaks |
singleThresholdPremium | number | 626350 | Income at which a single filer enters that band |
jointThresholdPremium | number | 751600 | Income at which a couple filing jointly enters the same band |
jointShortfallPremium | number | 501100 | How far the joint threshold falls short of twice the single threshold |
effectiveRateCurvePremium | object | {...} | Effective and marginal rate at a fixed ladder of incomes, for each filing status, showing the shape of the schedule |
singlePremium | array[5] | ||
incomePremium | number | 25000 | |
taxableIncomePremium | number | 10000 | |
taxPremium | number | 1000 | |
effectiveRatePremium | number | 0.04 | |
marginalRatePremium | number | 0.1 | |
married_filing_jointlyPremium | array[5] | ||
incomePremium | number | 25000 | |
taxableIncomePremium | number | 0 | |
taxPremium | number | 0 | |
effectiveRatePremium | number | 0 | |
marginalRatePremium | number | 0.1 | |
married_filing_separatelyPremium | array[5] | ||
incomePremium | number | 25000 | |
taxableIncomePremium | number | 10000 | |
taxPremium | number | 1000 | |
effectiveRatePremium | number | 0.04 | |
marginalRatePremium | number | 0.1 | |
head_of_householdPremium | array[5] | ||
incomePremium | number | 25000 | |
taxableIncomePremium | number | 2500 | |
taxPremium | number | 250 | |
effectiveRatePremium | number | 0.01 | |
marginalRatePremium | number | 0.1 | |
changesPremium | object | {...} | How the table moved since the previous tax year; null when there is no prior year to compare against |
versusYearPremium | number | 2024 | The tax year being compared against |
indexingPercentPremium | number | 2.794 | Average shift across every indexed threshold, which is the inflation adjustment the tax authority actually applied |
bracketShiftsPremium | object | {...} | Each band's threshold before and after, per filing status, with the percentage it moved |
singlePremium | array[6] | ||
ratePremium | number | 0.12 | |
fromPremium | number | 11600 | |
toPremium | number | 11925 | |
shiftPercentPremium | number | 2.802 | |
married_filing_jointlyPremium | array[6] | ||
ratePremium | number | 0.12 | |
fromPremium | number | 23200 | |
toPremium | number | 23850 | |
shiftPercentPremium | number | 2.802 | |
married_filing_separatelyPremium | array[6] | ||
ratePremium | number | 0.12 | |
fromPremium | number | 11600 | |
toPremium | number | 11925 | |
shiftPercentPremium | number | 2.802 | |
head_of_householdPremium | array[6] | ||
ratePremium | number | 0.12 | |
fromPremium | number | 16550 | |
toPremium | number | 17000 | |
shiftPercentPremium | number | 2.719 |
Errors
Read the HTTP status first, then error for the specific reason. The body names the parameter that has to change. Error handling covers the full status list and which of them are worth retrying.
| Status | Meaning | What to do |
|---|---|---|
400 | Input was rejected | Read error; it names the parameter. |
401 | Key missing or invalid | Check the header name and the key value. |
403 | Key valid, but not permitted | A key restriction or IP allow-list; see key scoping. |
429 | Rate limited, or out of credits | Read error to tell them apart; see rate limits. |
Use cases
- Tax Planning
- Use the Income Tax Brackets API to retrieve current and historical tax bracket data for financial planning and tax strategy
- Financial Applications
- Build financial tools and calculators by using the Income Tax Brackets API to get accurate tax rate data for any year
- Education
- Use the Income Tax Brackets API to teach and learn about the US federal income tax system and how brackets have changed over time
- Data Analysis
- Analyze historical tax bracket trends by using the Income Tax Brackets API to retrieve bracket data across multiple years
Other ways to use Income Tax Brackets
Set up Income Tax Brackets on APIVerve, or reach the same source a different way. Your APIVerve account and credits work on all of them — one key, one balance.
Give it to an AI agentConnect over MCP and your agent calls it as a native tool — Claude, Cursor, ChatGPT.VerveKit →Reference →
Use it in Google Sheets or ExcelA =VERVE() formula fills a column — no script, no export, recalculates in place.VerveSheets →Reference →
Ground an agent on itA cited, machine-checkable fact your model can't produce on its own.VerveContext →Reference →
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