---
title: "Car Loan Calculator with Sales Tax and Trade-In"
method: POST
path: "/api/v1/tools/car-loan-calculator"
tags: ["auto"]
---

# Car Loan Calculator with Sales Tax and Trade-In

`POST /api/v1/tools/car-loan-calculator`

## Request

- Base URL: `https://calcfleet.com`
- URL: `https://calcfleet.com/api/v1/tools/car-loan-calculator`
- Auth: none declared

Calculate your exact monthly car payment including sales tax and trade-in. View your full amortization schedule, total interest paid, and cost of ownership.

## Request body

- object
  - `vehiclePrice` number, required
  - `downPayment` number, required
  - `tradeInValue` number, required
  - `annualRatePct` number, required
  - `termMonths` integer, required
  - `salesTaxPct` number, required

## Response `200`

Successful calculation result.

- object
  - `result` object, required: Structured calculation output (fields vary per calculator).

## Other responses

- `400`: Invalid input — the issues array contains Zod validation errors.
- `403`: Forbidden — an Authorization: Bearer cf_… key was supplied but is invalid.
- `404`: Unknown tool slug.

---

[API](https://skmtc.dev/calcfleet/apis/calcfleet-financial-calculators-api.md) · [All operations](https://skmtc.dev/calcfleet/apis/calcfleet-financial-calculators-api/llms.txt) · [OpenAPI document](https://skmtc.dev/calcfleet/apis/calcfleet-financial-calculators-api/revisions/cd9abd595bbe?raw)