---
title: "Creates a new draft invoice. Optionally creates a new customer company and contact if no matching company is found."
method: POST
path: "/api/Invoice"
tags: ["Invoice"]
---

# Creates a new draft invoice. Optionally creates a new customer company and contact if no matching company is found.

`POST /api/Invoice`

## Request body

- NewInvoice — Request model for creating a new customer invoice. Supports automatic company/contact creation.
  - `TransactionPrefix` string — A prefix for the Invoice number. e.g. 'INV'. If left blank it will be set to the account default. Max length 20 characters.
  - `InvoiceNumber` string — Pass any string. If left blank it will use the next number in the auto incrementing sequence. If an integer is passed then the largest integer will be use as the seed to auto generate the next invoice number in the sequence.
  - `CompanyIDFK` integer — If left blank then you must specify Company Name.
  - `CompanyName` string — If left blank then you must specify Company ID. Specified Name will be used to match existing customer record. If not matched then it will be used to create a new customer. First Name, Last Name and Email will only be used if it is a new company. If the Company name appears multiple times we will check the email address to find a matching company. If email address doesn't identify a matching company then the invoice creation will be rejected.
  - `Firstname` string — Specified value will be used to create a new customer contact only if a new customer is being created.
  - `Lastname` string — Specified value will be used to create a new customer contact only if a new customer is being created.
  - `Email` string — Specified value will be used to create a new customer contact only if a new customer is being created.
  - `CurrencyCode` string — Expects ISO Standard 3 character currency code. If left blank the currency will default to account's currency in general setting. For existing companies this field will be ignored and the invoice will use the currency of the customer. For new customers if the currency is not specified then account currency will be used otherwise the specified currency will be used.
  - `ExchangeRate` number, double — Exchange rate is only valid for invoices in currency other than default account currency. If not specified it will get the market rate based on the Date Issued.
  - `InvoiceTemplateIDFK` integer — If left blank the account default invoice template will be used.
  - `Subject` string — Plain UTF8 text. (no HTML). 255 characters max
  - `CustomerPONumber` string — Plain UTF8 text. 100 characters max
  - `DateIssued` string, date-time — If not specified it will use today's date. The date should be specified as local date.
  - `PaymentTerms` integer — "If left blank we will set it to customer default. If specified then it must match one of your existing pre configured payment term periods. Your account starts with: (-1 --- Custom, 0 --- Upon Receipt, 7 --- 7 Days, 15 --- 15 Days, 30 --- 30 Days, 45 --- 45 Days, 60 --- 60 Days)
  - `DueDate` string, date-time — It will be auto calculated based on the payment term and issue date. Due Date must be greater than or equal to Issue Date. If the Due Date is specified then Payment Terms will be set to -1 (Custom)
  - `TransactionTaxConfigCode` string — Possible values are (EX --- Tax Exclusive, INC --- Tax Inclusive). If left empty it will use the account default.
  - `Notes` string — Plain UTF8 text. (no HTML). Max 2000 characters
  - `LineItems` NewInvoiceLineItem[]
    - `InventoryItemIDFK` integer — If not specified then Inventory Item Name must be specified.
    - `InventoryItemName` string — If not specified then Inventory item ID must be specified. If specified and not matched to any existing inventory items then a new inventory item will be created. Max 200 characters.
    - `Description` string — Plain UTF8 text. (no HTML). When the line item links source records and this is omitted, a description is generated from the linked records.
    - `Quantity` number, double — The quantity for the line item. Required unless the line item links source records (TimesheetEntryIDs / ExpenseIDs / FixedAmountIDs), in which case it is calculated from the linked records when omitted (e.g. total timesheet duration with account rounding applied).
    - `UnitPrice` number, double — The unit price for the lineitem. Required unless the line item links source records, in which case it is calculated from the linked records when omitted (timesheets: the billable rate, blended when rates differ; expenses: converted amount including category markup; fixed amounts: the amount).
    - `TaxIDFK` integer — If specified then it must match an existing Tax ID. If not specified then Tax Name and Tax Percent must be specified - except on a line item linking source records, where the tax is derived from the linked records when omitted.
    - `TaxName` string — Must be specified if the Tax ID is blank. If the Tax Name is specified it will be matched to an existing Tax Name or else a new Tax will be created.
    - `TaxPercent` number, double — The Tax Percent will only be used if a new tax is being created.
    - `Discount` number, double — Enter 10.5 to give a 10.5% discount
    - `ProjectIDFK` integer — Optional. Project ID of an Avaza Project that belongs to this customer, so line item is attributed to that Project for reporting. Must be omitted when the line item links source records (it is derived from them).
    - `TimesheetEntryIDs` integer[] — Optional. IDs of uninvoiced Timesheet entries to link to (invoice with) this line item. All entries must be billable, Approved or AutoApproved, not already invoiced, have no running timer, belong to the invoice's customer, and share a single project. Put one ID per line item for a dedicated line per entry, or several IDs to group them into one line. A line item may link only ONE source type, and InventoryItemIDFK/InventoryItemName/ProjectIDFK must be omitted on linked lines (they are derived from the source records).
    - `ExpenseIDs` integer[] — Optional. IDs of uninvoiced chargeable Expenses (Approved or AutoApproved, belonging to the invoice's customer) to link to this line item. Multiple expenses grouped onto one line must share the same tax. Quantity is 1 and UnitPrice is calculated from the expense amounts (including category markup and currency conversion) unless overridden. A line item may link only ONE source type, and InventoryItemIDFK/InventoryItemName/ProjectIDFK must be omitted on linked lines.
    - `FixedAmountIDs` integer[] — Optional. ID of an uninvoiced Fixed Amount to link to this line item - maximum ONE per line item (fixed amounts are always invoiced on their own line). Quantity is 1 and UnitPrice/Tax/InventoryItem come from the fixed amount unless overridden. A line item may link only ONE source type, and InventoryItemIDFK/InventoryItemName/ProjectIDFK must be omitted on linked lines.
  - `ExpenseExchangeRates` ExpenseExchangeRate[] — Optional exchange-rate overrides applied when line items link Expenses in a currency different from the invoice currency. Expenses in currencies without an override use the stored/market rate. Ignored when no expenses are linked. Note: line item links cannot be used when creating a new customer company.
    - `CurrencyCode` string, required — ISO standard 3 character currency code of the expense currency.
    - `Rate` number, double, required — The rate that converts 1 unit of the expense currency into the invoice currency. Must be greater than zero.
  - `SendWebhooks` boolean — If true, fires the invoice_created webhook event to any subscribed endpoints (and timesheet_updated / expense_updated for any timesheets or expenses pulled into the invoice). Defaults to false to preserve existing integration behaviour.

## Response `200`

Returns the created invoice with assigned Transaction ID and line items.

- Invoice — A customer invoice including line items, status, amounts, issuer/recipient details, and web links.
  - `TransactionID` integer — Unique identifier for the invoice transaction.
  - `AccountIDFK` integer — The Avaza account this invoice belongs to.
  - `TransactionPrefix` string — Prefix used in the invoice number (e.g. 'INV').
  - `InvoiceNumber` string — The full invoice number including prefix.
  - `CompanyIDFK` integer — The customer company ID this invoice is for.
  - `CompanyName` string — Name of the customer company.
  - `ExternalContactUserIDFK` integer — The external contact user ID associated with this invoice.
  - `Subject` string — Subject line for the invoice.
  - `DateIssued` string, date-time — Date the invoice was issued.
  - `DateSent` string, date-time — Date the invoice was sent to the customer.
  - `DueDate` string, date-time — Payment due date.
  - `TransactionStatusCode` string — Current status. Values: Draft, Sent, Late, Paid, Partial, Void.
  - `TaxAmount` number, double — Total tax amount across all line items.
  - `TransactionTaxConfigCode` string — Tax configuration: 'EX' (exclusive) or 'INC' (inclusive).
  - `Balance` number, double — Outstanding balance remaining on the invoice.
  - `CurrencyCode` string — ISO 3-character currency code for the invoice.
  - `TotalAmount` number, double — Total amount of the invoice including tax.
  - `ExchangeRate` number, double — Exchange rate to the account's base currency. 1.0 if same currency.
  - `Notes` string — Additional notes or comments on the invoice.
  - `CustomerPONumber` string — Customer's purchase order number for reference.
  - `DateCreated` string, date-time — Date and time the record was created.
  - `DateUpdated` string, date-time — Date and time the record was last updated.
  - `LineItems` InvoiceLineItem[] — Line items on this invoice.
    - `TransactionLineItemID` integer — Unique identifier for the line item.
    - `InventoryItemIDFK` integer — The inventory/product item ID for this line item.
    - `InventoryItemName` string — Name of the inventory/product item.
    - `InventoryItemSKU` string — Stock Keeping Unit code for the inventory item.
    - `Description` string — Text description for the line item.
    - `Quantity` number, double — Quantity of items on this line.
    - `UnitPrice` number, double — Price per unit for this line item.
    - `TaxAmount` number, double — Calculated tax amount on this line item.
    - `TaxIDFK` integer — The tax rate ID applied to this line item.
    - `TaxCode` string — Short code for the applied tax rate.
    - `TaxName` string — Name of the applied tax rate.
    - `ProjectIDFK` integer — Optional project ID this line item is attributed to for reporting.
    - `ProjectTitle` string — Title of the associated project.
    - `Amount` number, double — Calculated line total (Quantity x UnitPrice less Discount).
    - `Discount` number, double — Discount percentage applied to this line item.
    - `TimesheetEntryIDs` integer[] — IDs of the Timesheet entries linked to (invoiced by) this line item. Empty when the line item has no linked timesheets.
    - `ExpenseIDs` integer[] — IDs of the Expenses linked to (invoiced by) this line item. Empty when the line item has no linked expenses.
    - `FixedAmountIDs` integer[] — IDs of the Fixed Amounts linked to (invoiced by) this line item. Empty when the line item has no linked fixed amounts.
  - `Links` InvoiceLinks — URLs for client-facing view, internal view, and editing an invoice in the Avaza web application.
    - `ClientView` string — URL for the customer to view and pay the invoice online.
    - `View` string — URL for viewing the invoice in the Avaza application.
    - `Edit` string — URL for editing the invoice in the Avaza application.
  - `Issuer` IssuerDetails — Billing address and tax details for the Avaza account (the party issuing an invoice or estimate).
    - `BillingAddress` string — Formatted multi-line billing address.
    - `BillingAddressLine` string — Street address line of the billing address.
    - `BillingAddressCity` string — City/suburb of the billing address.
    - `BillingAddressState` string — State/province of the billing address.
    - `BillingAddressPostCode` string — Postal/ZIP code of the billing address.
    - `BillingCountryCode` string — ISO 3166-1 alpha-2 country code of the billing address.
    - `TaxNumber` string — Tax registration number (e.g. VAT number, ABN, EIN).
  - `Recipient` RecipientDetails — Billing address details for the customer receiving an invoice or estimate.
    - `CompanyIDFK` integer — The customer company ID.
    - `CompanyName` string — Name of the customer company.
    - `RecipientFormattedBillingAddress` string — Pre-formatted multi-line billing address for the recipient.
    - `RecipientBillingAddressLine` string — Street address line for the recipient.
    - `RecipientBillingAddressCity` string — City/suburb for the recipient.
    - `RecipientBillingAddressState` string — State/province for the recipient.
    - `RecipientBillingAddressPostCode` string — Postal/ZIP code for the recipient.
    - `RecipientBillingAddressCountryCode` string — ISO country code for the recipient.

## Other responses

- `401` — Unauthorized

---

[API](https://skmtc.dev/avaza/apis/avaza-api-documentation.md) · [All operations](https://skmtc.dev/avaza/apis/avaza-api-documentation/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/avaza/avaza-api-documentation/revisions/e99843f3c878/schema)