---
title: "Look up a state's property tax rules"
method: POST
path: "/api/v1/get-state-mortgage-rules"
tags: ["calculations"]
---

# Look up a state's property tax rules

`POST /api/v1/get-state-mortgage-rules`

## Request

- Base URL: `https://www.usmortgagecalc.com`
- URL: `https://www.usmortgagecalc.com/api/v1/get-state-mortgage-rules`
- Auth: none declared

How property tax actually works in one state: how assessed value is derived, any statutory growth cap, the billing cycle, named exemptions such as homestead, the filing deadline, who hears appeals and the window to file, notable county variation, and a link to the state's own tax authority. Use this when the question is about mechanics or deadlines rather than a dollar amount.

## Request body

- object: Property tax mechanics, exemptions, appeal windows and county variation for one state.
  - `state` string, required: Full US state name, for example "Texas". Used to look up the average property tax rate. Either this or propertyTaxRatePercent is required.

## Response `200`

Calculation result.

- object
  - `data` object: The calculation result.
  - `meta` object
    - `operation` string
    - `computedAt` string, date-time

## Other responses

- `400`: Input failed validation. The message names the offending field.
- `429`: Rate limit exceeded. Retry after the interval in Retry-After.

---

[API](https://skmtc.dev/usmortgagecalc/apis/us-mortgage-calculator-api.md) · [All operations](https://skmtc.dev/usmortgagecalc/apis/us-mortgage-calculator-api/llms.txt) · [OpenAPI document](https://skmtc.dev/usmortgagecalc/apis/us-mortgage-calculator-api/revisions/4439848058a8?raw)