# Transaction effective date

Source: https://developer.avalara.com/products/excise/integration-guides/excise/jfw5136249088799/

Guide: AvaTax Excise

# Transaction effective date

Understand the transaction `EffectiveDate` and its role in determining tax rates.

**Element type**: Required

**Endpoints/models used**: [RestTransaction](https://developer.avalara.com/api-reference/excise/v1/models/Avalara.Excise.Determination.Engine.RestTransaction/)

Users must specify on each transaction the date of the physical product movement. This is typically the bill of lading date and represents the date when the tax rate will be applied to this transaction. The transaction effective date is specified using the `EffectiveDate` field in the [RestTransaction](https://developer.avalara.com/api-reference/excise/v1/models/Avalara.Excise.Determination.Engine.RestTransaction/) model.

## Example

```
{
    "EffectiveDate": "2024-09-01T15:53:23.769Z",
    "InvoiceDate": "2024-09-01T15:53:23.769Z",
    "InvoiceNumber": "Test_NIC",
    "TitleTransferCode": "DEST",
    "TransactionType": "WHOLESALE",
    "Seller": "RESELLER",
    "Buyer": "CUSTOMER",
    "UserTranId": "CarisamTest1",
    "EntityUseCode": "",
    "CustomString1": "Header1",
    "CustomString2": "Header2",
    "CustomString3": "Header3",
    "CustomString4": "",
    "CustomString5": "",
    "CustomString6": "",
    "CustomString7": "",
    "CustomString8": "",
    "CustomString9": "",
    "CustomString10": "",
    "CustomNumeric1": 0,
    "CustomNumeric2": 0,
    "CustomNumeric3": 0,
    "CustomNumeric4": 0,
    "CustomNumeric5": 0,
    "CustomNumeric6": 0,
    "CustomNumeric7": 0,
    "CustomNumeric8": 0,
    "CustomNumeric9": 0,
    "CustomNumeric10": 0,
    "UserData": "Test_Nicotine",
    "SourceSystem": "POSTMAN",
    "AvataxTransactionType": "SalesInvoice",
    "Discount": "0.00",
    "TransactionLines": [
        {
            ...
        }
    ]
}
```