# PATCH /api/v1/advisory-firms/{firm_id}/businesses/accounting-basis

> Bulk-set client accounting basis

- **Tag:** advisory-firms
- **Operation ID:** `set_firm_businesses_accounting_basis`

## Description

Set the default accounting basis (cash or accrual) that financial reports open on for several of the firm's client businesses at once. Every id must be an active client of the firm; otherwise the whole batch is rejected and nothing is changed. Firm owners/admins only.

## Authentication

Bearer token in `Authorization` header.
Required header: `x-business-id: <business uuid>`.

## Parameters

- `firm_id` (path, string, required)

## Request body

Schema: `FirmBusinessAccountingBasisRequest`

- `business_ids` (array · string · required) — Client business IDs to update. Every id must be an active client of the firm.
- `accounting_basis` (string · required) (one of: cash, accrual) — Default basis financial reports open on for the selected businesses: 'accrual' or 'cash'.

## Responses

### 200 — Successful Response

Schema: `SuccessEnvelope_FirmBusinessAccountingBasisResponse_`

- `success` (boolean)
- `message` (string)
- `code` (string)
- `data` (FirmBusinessAccountingBasisResponse)

### 400 — Bad Request - Invalid input

Schema: `ErrorResponse`

- `error` (string · required) — Error category: `validation_error`, `unauthorized`, `forbidden`, `not_found`, `conflict`, `rate_limited`, `server_error`, or `service_unavailable`.
- `message` (string · required) — Human-readable explanation, safe to show to end users.
- `code` (string · required) — Stable machine-readable code in `CATEGORY_NNN` form (e.g. `NOT_FOUND_006`, `AUTH_010`, `GEN_002`).
- `request_id` (string) — Correlation id for support requests. Echoes the `x-request-id` request header when one was supplied.
- `errors` (object) — Field-level validation messages keyed by field name. Present on 400/422 validation failures only.

### 401 — Unauthorized - Missing/invalid token or no access to this business

Schema: `ErrorResponse`

- `error` (string · required) — Error category: `validation_error`, `unauthorized`, `forbidden`, `not_found`, `conflict`, `rate_limited`, `server_error`, or `service_unavailable`.
- `message` (string · required) — Human-readable explanation, safe to show to end users.
- `code` (string · required) — Stable machine-readable code in `CATEGORY_NNN` form (e.g. `NOT_FOUND_006`, `AUTH_010`, `GEN_002`).
- `request_id` (string) — Correlation id for support requests. Echoes the `x-request-id` request header when one was supplied.
- `errors` (object) — Field-level validation messages keyed by field name. Present on 400/422 validation failures only.

### 403 — Forbidden - Insufficient permissions

Schema: `ErrorResponse`

- `error` (string · required) — Error category: `validation_error`, `unauthorized`, `forbidden`, `not_found`, `conflict`, `rate_limited`, `server_error`, or `service_unavailable`.
- `message` (string · required) — Human-readable explanation, safe to show to end users.
- `code` (string · required) — Stable machine-readable code in `CATEGORY_NNN` form (e.g. `NOT_FOUND_006`, `AUTH_010`, `GEN_002`).
- `request_id` (string) — Correlation id for support requests. Echoes the `x-request-id` request header when one was supplied.
- `errors` (object) — Field-level validation messages keyed by field name. Present on 400/422 validation failures only.

### 404 — Not Found - Resource does not exist

Schema: `ErrorResponse`

- `error` (string · required) — Error category: `validation_error`, `unauthorized`, `forbidden`, `not_found`, `conflict`, `rate_limited`, `server_error`, or `service_unavailable`.
- `message` (string · required) — Human-readable explanation, safe to show to end users.
- `code` (string · required) — Stable machine-readable code in `CATEGORY_NNN` form (e.g. `NOT_FOUND_006`, `AUTH_010`, `GEN_002`).
- `request_id` (string) — Correlation id for support requests. Echoes the `x-request-id` request header when one was supplied.
- `errors` (object) — Field-level validation messages keyed by field name. Present on 400/422 validation failures only.

### 422 — Validation Error

Schema: `ErrorResponse`

- `error` (string · required) — Error category: `validation_error`, `unauthorized`, `forbidden`, `not_found`, `conflict`, `rate_limited`, `server_error`, or `service_unavailable`.
- `message` (string · required) — Human-readable explanation, safe to show to end users.
- `code` (string · required) — Stable machine-readable code in `CATEGORY_NNN` form (e.g. `NOT_FOUND_006`, `AUTH_010`, `GEN_002`).
- `request_id` (string) — Correlation id for support requests. Echoes the `x-request-id` request header when one was supplied.
- `errors` (object) — Field-level validation messages keyed by field name. Present on 400/422 validation failures only.

## Code samples

### cURL

```bash
curl -X PATCH 'https://api.ondayzero.com/api/v1/advisory-firms/{firm_id}/businesses/accounting-basis' \
  -H 'Authorization: Bearer dz_your_token' \
  -H 'x-business-id: YOUR_BUSINESS_ID' \
  -H 'Content-Type: application/json' \
  -d '{
  "business_ids": [],
  "accounting_basis": "cash"
}'
```

### JavaScript

```javascript
const response = await fetch('https://api.ondayzero.com/api/v1/advisory-firms/{firm_id}/businesses/accounting-basis', {
  method: 'PATCH',
  headers: {
    Authorization: 'Bearer dz_your_token',
    'x-business-id': 'YOUR_BUSINESS_ID',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
  "business_ids": [],
  "accounting_basis": "cash"
}),
});
const data = await response.json();
```

### Python

```python
import httpx

headers = {
    "Authorization": "Bearer dz_your_token",
    "x-business-id": "YOUR_BUSINESS_ID",
}

payload = {'business_ids': [], 'accounting_basis': 'cash'}

response = httpx.patch("https://api.ondayzero.com/api/v1/advisory-firms/{firm_id}/businesses/accounting-basis", headers=headers, json=payload)
data = response.json()
```

## See also

- HTML version: https://www.ondayzero.com/docs/reference/advisory-firms/set-firm-businesses-accounting-basis
- OpenAPI slice: https://www.ondayzero.com/docs/reference/advisory-firms/set-firm-businesses-accounting-basis/openapi.json
- Other endpoints in **advisory-firms**: https://www.ondayzero.com/docs/reference/advisory-firms (markdown bundle: https://www.ondayzero.com/docs/reference/advisory-firms.md, OpenAPI: https://www.ondayzero.com/docs/reference/advisory-firms/openapi.json)
- Endpoint catalog: https://www.ondayzero.com/docs/reference/index.md