Create an expense
Finance module
POST/expensesexpenses.create
An expense. One expense posts to exactly one budget line; the submitter cannot approve it. Creates an expense. Requires `Idempotency-Key`; a replay returns the original response. The organization is derived from the credential or the parent row, never from the body.
- Requires the capability finance.expense.write.
- OAuth scopes: finance.
- Send an Idempotency-Key header. A replay with the same key returns the original response.
- Error statuses: 400, 401, 409, 422, 429. Errors are RFC 9457 problem details.
Request body: ExpenseCreate
| Field | Type | Required | Description |
|---|---|---|---|
| budget_line_id | string (uuid) | Yes | Identifier of the budget line. |
| description | string | Yes | Expense description.Constraints: length 1 to 300 |
| amount_minor | integer (int64) | Yes | Expense amount. Integer minor units of the document currency.Constraints: range 0 to any |
| currency_code | string | Yes | ISO 4217 currency code of every money field.Constraints: pattern ^[A-Z]{3}$ |
| incurred_on | string (date) | Yes | When it was incurred. |
| counterparty_id | string (uuid) | null | No | Identifier of the counterparty paid, when it is not the submitter. |
{
"budget_line_id": "0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f",
"description": "Gaffer tape, 12 rolls",
"amount_minor": 14388,
"currency_code": "USD",
"incurred_on": "2026-10-08",
"counterparty_id": "0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f"
}Response 201: Expense
| Field | Type | Required | Description |
|---|---|---|---|
| id | string (uuid) | Yes | Identifier of the expense. |
| org_id | string (uuid) | Yes | Identifier of the owning organization, derived from the parent row and never accepted from the caller. |
| created_at | string (date-time) | Yes | When the row was created. |
| created_by | string (uuid) | null | Yes | Identifier of the person who created the row; null when a seed, platform or system process created it. |
| updated_at | string (date-time) | Yes | When the row was last updated. |
| updated_by | string (uuid) | null | Yes | Identifier of the person who last updated the row; null when a seed, platform or system process updated it. |
| budget_line_id | string (uuid) | Yes | Identifier of the budget line. |
| submitter_person_id | string (uuid) | null | Yes | Identifier of the person who submitted the expense. |
| description | string | Yes | Expense description.Constraints: length 1 to 300 |
| amount_minor | integer (int64) | null | Yes | Expense amount. Integer minor units of the resource currency; null means unpriced, never zero. |
| currency_code | string | Yes | ISO 4217 currency code of every money field.Constraints: pattern ^[A-Z]{3}$ |
| incurred_on | string (date) | Yes | When it was incurred. |
| expense_state | "Proposed" | "Approved" | "Rejected" | "Paid" | "Canceled" | Yes | Expense state. |
| counterparty_id | string (uuid) | null | Yes | Identifier of the counterparty paid, when it is not the submitter. |
{
"id": "0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f",
"org_id": "0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f",
"created_at": "2026-10-08T14:30:00Z",
"created_by": "0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f",
"updated_at": "2026-10-08T14:30:00Z",
"updated_by": "0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f",
"budget_line_id": "0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f",
"submitter_person_id": "0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f",
"description": "Gaffer tape, 12 rolls",
"amount_minor": 14388,
"currency_code": "USD",
"incurred_on": "2026-10-08",
"expense_state": "Proposed",
"counterparty_id": "0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f"
}Code samples
curl -X POST "$XOS_BASE_URL/expenses" \
-H "Authorization: Bearer $XOS_API_KEY" \
-H "Idempotency-Key: $(uuidgen)" \
-H "Content-Type: application/json" \
-d '{"budget_line_id":"0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f","description":"Gaffer tape, 12 rolls","amount_minor":14388,"currency_code":"USD","incurred_on":"2026-10-08","counterparty_id":"0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f"}'const { data } = await xos.expenses.create({
"budget_line_id": "0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f",
"description": "Gaffer tape, 12 rolls",
"amount_minor": 14388,
"currency_code": "USD",
"incurred_on": "2026-10-08",
"counterparty_id": "0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f"
});response = xos.expenses.create({"budget_line_id": "0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f", "description": "Gaffer tape, 12 rolls", "amount_minor": 14388, "currency_code": "USD", "incurred_on": "2026-10-08", "counterparty_id": "0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f"})xos expenses create --data '{"budget_line_id":"0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f","description":"Gaffer tape, 12 rolls","amount_minor":14388,"currency_code":"USD","incurred_on":"2026-10-08","counterparty_id":"0192f1e2-7c3a-7b4d-9e8f-1a2b3c4d5e6f"}'