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# Income Limits Overview

> Overview of the Income Limits API endpoints and functionality

The Income Limits API provides access to the income eligibility limits for affordable housing programs at a property. These limits are derived from the property's set-aside programs and reflect the maximum annual household income allowed under a given AMI (Area Median Income) percentage tier.

## Key Concepts

### AMI Percentage

Each income limit is tied to an AMI percentage tier (e.g. `50%`, `60%`, `80%`) and program name (e.g. `LIHTC-60%`, `HOME-50%`). This represents the fraction of the Area Median Income for the local metro area that defines the income ceiling for that unit set-aside.

### Household Size

Income limits vary by the number of people in the household. Each record represents a single combination of AMI percentage tier and household size (1–12 people), with a corresponding dollar `amount`.

### Effective Date

Limits are updated annually (typically in April) as HUD publishes new AMI data. Use the `effectiveDate` field to identify which year's limits apply.

### Over-Income Threshold

The `overIncomeThresholdPercentage` field indicates how far above the income limit a household can be and still qualify under program rules. This varies by program — LIHTC allows up to `140%` of the limit, while HOME uses `80%`. This is critical for evaluating current residents at the end of a compliance period.

## Available Endpoints

| Endpoint                                                                          | Summary            | Method |
| --------------------------------------------------------------------------------- | ------------------ | :----: |
| [`/incomeLimits`](/api-reference/income-limits/list-income-limits)                | List Income Limits |   GET  |
| [`/incomeLimits/{incomeLimitId}`](/api-reference/income-limits/read-income-limit) | Read Income Limit  |   GET  |

> Overview of the Income Limits API endpoints and functionality


## API Docs

- Income Limits [List Income Limits](https://developer.fortresstech.io/api-reference/income-limits/list-income-limits.md)
- Income Limits [Read Income Limit](https://developer.fortresstech.io/api-reference/income-limits/read-income-limit.md)

## OpenAPI Specification

The raw OpenAPI 3.1 specification for this API is available at:
- [OpenAPI JSON](https://developer.fortresstech.io/openapi.json)
- [OpenAPI YAML](https://developer.fortresstech.io/openapi.yaml)