api-docs/docs/node-tracker/markdown/node-tracker.ecommercetransactionevent.tax.md
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[Home](./index.md) > [@snowplow/node-tracker](./node-tracker.md) > [EcommerceTransactionEvent](./node-tracker.ecommercetransactionevent.md) > [tax](./node-tracker.ecommercetransactionevent.tax.md)
## EcommerceTransactionEvent.tax property
The amount of tax on the transaction
<b>Signature:</b>
```typescript
tax?: number;
```