> ## Documentation Index
> Fetch the complete documentation index at: https://docs.trassets.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Depreciation Data Model: Assets and Depreciation Postings

> Understand the Depreciation domain in the Trassets Data API: fixed assets and their depreciation postings.

The Depreciation domain contains fixed-asset master data and the individual depreciation
postings booked against each asset.

## assets

`GET /depreciation/assets` — fixed-asset master data.

<ResponseField name="property_id" type="integer" required>
  Unique property identifier.
</ResponseField>

<ResponseField name="asset_hdr_id" type="integer" required>
  Unique asset identifier. `depreciation` postings reference this field.
</ResponseField>

<ResponseField name="asset_id" type="string">
  Asset number.
</ResponseField>

<ResponseField name="asset_name" type="string">
  Asset name.
</ResponseField>

<ResponseField name="acquisition_date" type="date">
  Date the asset was acquired.
</ResponseField>

<ResponseField name="built_date" type="date">
  Date the asset was put into service.
</ResponseField>

<ResponseField name="begin_afa" type="date">
  Start date of the depreciation schedule.
</ResponseField>

<ResponseField name="end_afa" type="date">
  End date of the depreciation schedule.
</ResponseField>

<ResponseField name="afa_duration" type="string">
  Depreciation duration.
</ResponseField>

<ResponseField name="afa_method" type="string">
  Depreciation method applied.
</ResponseField>

<ResponseField name="depreciation_active" type="string">
  Whether depreciation is currently active for this asset.
</ResponseField>

## depreciation

`GET /depreciation/depreciation` — individual depreciation postings, one row per booking.

<ResponseField name="property_id" type="integer" required>
  Unique property identifier.
</ResponseField>

<ResponseField name="asset_hdr_id" type="integer" required>
  References the asset in `assets.asset_hdr_id`.
</ResponseField>

<ResponseField name="asset_id" type="string">
  Asset number.
</ResponseField>

<ResponseField name="booking_date" type="date" required>
  Date of the depreciation posting.
</ResponseField>

<ResponseField name="booking_date_text" type="string">
  Display text for the posting date.
</ResponseField>

<ResponseField name="booking_net_value" type="number" required>
  Net value posted in this depreciation entry.
</ResponseField>

<ResponseField name="booking_text" type="string">
  Free-text description of the posting.
</ResponseField>

<Tip>
  One `assets` row typically has many `depreciation` rows over its useful life — join on
  `asset_hdr_id` to build a full depreciation schedule for an asset.
</Tip>