# business.change_fiscal_year

Record an evidenced fiscal-year change and its transition period. Preview it with business_fiscal_year_change_preview first; earlier history is preserved.

## What it does

Change the business fiscal year end from the start of a fiscal year under the current setting (effective_at, 00:00 UTC, not later than now). The first year under the new year end is one transition period from that start to the first new year end (at most 12 months); earlier fiscal years and events are never rewritten. Needs a source_document as evidence (e.g. the board resolution). Preview with the business read, action fiscal_year_change_preview.

## Before you send it

Requires an interactive OAuth connection; headless credentials are refused. Effective membership, application grant and token permissions still apply. Describe `business.change_fiscal_year` through `GET /v1/catalog/commands/{name}` before acting.

The envelope may reference a registered source document of kind `source_document`; this is separate from any evidence required by the input.

## Inputs

Put these fields inside the envelope's `input` object. The outer envelope names the command, a stable `idempotency_key` and `effective_at`; [request and recovery rules](/docs/api/) explain those separately. Use exact minor-unit integer strings for monetary fields. Take existing IDs from prior reads or command results; choose a new identity only where the command asks for one.

Required means required within its containing object; an optional parent can be omitted.

| Field | Type | Required | Meaning and accepted values |
|---|---|---|---|
| `yearEnd` | string | Yes | Fiscal year end as MM-DD, e.g. 12-31, 03-31, 06-30. 02-29 is refused; use 02-28. Pattern: `"^(0[1-9]\|1[0-2])-(0[1-9]\|[12][0-9]\|3[01])$"`. Example: `"06-30"`. |
| `reason` | string | Yes |  Minimum length: `1`. Maximum length: `2000`. Example: `"Align with the academic-year customer cycle"`. |

## After acceptance

When the command emits events, its documented effects and receipt are recorded in the command transaction. The response returns `commandId`, `replayed`, the command-specific `result` below and emitted `events` with their IDs and CIDs. A command is not automatically a cash movement or revenue recognition: use the behavior above to determine what this command records.

Inspect `result` and the affected records or reports before continuing. Save returned identifiers for later calls. Fetch `GET /v1/commands/{id}` with `commandId` to recover the accepted receipt; retry the same intent with the same idempotency key if the response was lost. Some commands can succeed with `events: []` and return a transient result and `commandId` without persisting a receipt. A lookup of that ID can return null; retain the returned result and verify the affected record. Retrying can re-evaluate the current state rather than replay a stored result. A domain `no_change` is a separate success outcome with no persisted receipt.

### Result fields

Required means required within its containing object; an optional parent can be omitted.

| Field | Type | Required | Meaning and accepted values |
|---|---|---|---|
| `yearEnd` | string | Yes |   |
| `effectiveFrom` | string | Yes |  Format: date. |
| `transitionPeriod` | object | Yes |   |
| `transitionPeriod.start` | string | Yes |  Format: date. |
| `transitionPeriod.end` | string | Yes |  Format: date. |
| `transitionPeriod.months` | integer | Yes |   |
| `transitionPeriod.days` | integer | Yes |   |


[All commands](/docs/command-reference/) · [Operation and errors](/docs/api-reference/operations/commands-execute/) · [Reusable schemas](/docs/api-reference/components/)

Keep credentials out of prompts; rehearse writes only in a disposable sandbox.

## Exact request schema


```json
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "name": {
      "const": "business.change_fiscal_year"
    },
    "input": {
      "type": "object",
      "additionalProperties": false,
      "required": [
        "yearEnd",
        "reason"
      ],
      "properties": {
        "yearEnd": {
          "type": "string",
          "pattern": "^(0[1-9]|1[0-2])-(0[1-9]|[12][0-9]|3[01])$",
          "description": "Fiscal year end as MM-DD, e.g. 12-31, 03-31, 06-30. 02-29 is refused; use 02-28."
        },
        "reason": {
          "type": "string",
          "minLength": 1,
          "maxLength": 2000
        }
      }
    },
    "idempotency_key": {
      "type": "string",
      "minLength": 1,
      "maxLength": 256
    },
    "effective_at": {
      "type": "string",
      "format": "date-time",
      "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z))$"
    },
    "source_document_id": {
      "description": "A registered document of kind source_document that caused this command.",
      "type": "string",
      "minLength": 1
    }
  },
  "required": [
    "name",
    "input",
    "idempotency_key",
    "effective_at"
  ],
  "additionalProperties": false
}
```

## Accepted command receipt


```json
{
  "type": "object",
  "required": [
    "commandId",
    "replayed",
    "result",
    "events"
  ],
  "properties": {
    "commandId": {
      "type": "string"
    },
    "replayed": {
      "type": "boolean"
    },
    "imported": {
      "const": true,
      "description": "The command's events are history from before the business joined Economico, recorded as an import: free of monthly events."
    },
    "result": {
      "type": "object",
      "required": [
        "yearEnd",
        "effectiveFrom",
        "transitionPeriod"
      ],
      "properties": {
        "yearEnd": {
          "type": "string"
        },
        "effectiveFrom": {
          "type": "string",
          "format": "date"
        },
        "transitionPeriod": {
          "type": "object",
          "required": [
            "start",
            "end",
            "months",
            "days"
          ],
          "properties": {
            "start": {
              "type": "string",
              "format": "date"
            },
            "end": {
              "type": "string",
              "format": "date"
            },
            "months": {
              "type": "integer"
            },
            "days": {
              "type": "integer"
            }
          }
        }
      }
    },
    "events": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "id": {
            "type": "integer"
          },
          "cid": {
            "type": "string"
          }
        }
      }
    }
  }
}
```

## Example request


```json
{
  "name": "business.change_fiscal_year",
  "input": {
    "yearEnd": "06-30",
    "reason": "Align with the academic-year customer cycle"
  },
  "effective_at": "2026-09-01T00:00:00Z",
  "idempotency_key": "business.change_fiscal_year-example-0"
}
```