I have subscriptions contracts with my customers, so I have to enter the revenue manually and recur it also manually, but how can I recur the VAT?

Welcome to the Community, @ user99687.

When you recur transactions, the VAT will recur as well. Let's utilize the Recurring transactions feature so you can automatically recur the VAT, instead of entering it manually. Let me guide you through the process.

1. Click the Gear icon, then select Recurring transactions.
2. Select New and choose the Transaction Type from the drop-down.
3. Fill out the necessary information.
4. Click Save template.

Here's an article you can read for more details: How to create and manage recurring transactions.

Just in case you want to modify the recurring template, feel free to check out this article for the details steps and information: Edit a recurring template.

Keep in touch if you need more help with your VAT, or if there's anything else I can do for you. I always have your back and am always happy to help. Have a great day and keep safe.