Within Teamwork Projects you can update your payment details at any time via your subscription settings if you have a currently active subscription.
You can also change or add a tax number following this process.
Click your profile icon in the top right corner of your site, and select Subscription from the dropdown menu.
Note: Only site administrators in the owner company have access to this area.
In the Subscription area, you will see an option to update your payment details, below your plan summary.
You will be brought through the checkout process where you can put in your updated payment information, as well as contact details and any changes in billing address.
For some older subscription plans, the steps to update differ.
In the Subscription area, you will see a summary of the current plan you are on, at the top of the page.
Below the summary is a breakdown of your current plan as well as the other plans available to you.
At the bottom of your current plan, you will see a link to Update Payment Details.
This will bring you to the payment details page where you can update your card.
For more information see: Upgrading your Teamwork Projects plan