> For the complete documentation index, see [llms.txt](https://docs.digitalriver.com/salesforce-lightning/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.digitalriver.com/salesforce-lightning/appendix/enable-or-disable-us-tax-certificates.md).

# Enable or disable US tax certificates

In the Salesforce Lightning app, you can enable or disable US tax certificates. 

1. To enable or disable US Tax Certificates on the **My Account** page, add or remove the **Tax Certificates** menu item. 
2. To enable or disable US Tax Certificates on the **Checkout process/flow**, adjust the **DR Shipping Address** for the `drb2b_BuyerInfo` component and configure it to include (or not include) US Tax Certificates as part of the flow.

### Main flow and subflow details

| Flow type | Description                                                                                                                                                                                          |
| --------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Main flow | DR checkout flow                                                                                                                                                                                     |
| Subflow   | <p>DR Shipping Address Custom component: <code>drb2b\_BuyerInfo</code><br>Design variable: Enable Tax Certificates<br>Design variable values: {!$GlobalConstant.True} / {!$GlobalConstant.False}</p> |

### Enable tax certificates in the subflow

If the design variable's value is `!$GlobalConstant.True`, the tax certificates' functionality in the checkout flow will be enabled.

![](/files/-MdTqaDaqPF4Mg8WFuAo)

### Disable tax certificates in the subflow

If the design variable's value is `!$GlobalConstant.false`,  the tax certificates' functionality in the checkout flow will be disabled.

![](/files/-MdTqxeP7qTfoUofGHzC)

Once the design variable is configured, save and activate the checkout flow.