---
title: "Retrieves last book closed period"
method: GET
path: "/books/periods/last-closed"
tags: ["Books periods"]
---

# Retrieves last book closed period

`GET /books/periods/last-closed`

Returns the most recently closed accounting period for book-close workflows, including closed-on timestamps your automation can cache.
When no period has ever been closed the API responds with HTTP 404, so treat a missing resource as "not yet closed" rather than an outage.

## Response `200`

OK

- Book
  - `id` string, uuid, required
  - `start` string, date, required — Book period start date (inclusive)
  - `end` string, date, required — Book period end date (inclusive)
  - `status` 'OPEN' | 'CLOSED', required
  - `closed_on` string, date, required — Date on which book was closed

## Other responses

- `default` — Error

---

[API](https://skmtc.net/rillet/apis/rillet-accounting-api.md) · [All operations](https://skmtc.net/rillet/apis/rillet-accounting-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/rillet/rillet-accounting-api/revisions/a2ab794dd5f2/schema)