I'm looking for an accounting for a not ptofit NGO (in Belgium) that has not any VAT account. How can I receipt the fee's entrance by members?

I'm glad that you posted here in the Community, Cinciripini.

Would you mind confirming if you mean to record membership fees for a non-profit organization?

If so, let me walk you through how to perform this. First, we'll need to create a pledge/invoice for that fee. Here's how:

1. Click + New icon.
2. Below the CUSTOMERS column, pick Pledge/Invoice.
3. Select a member you want to record fee on the Customer field.
4. Enter the necessary information, especially the Product/Service and the Amount below.
5. Review the transaction, then tap Save and close.

Next, is to Receive the pledge. You can follow the steps below:

1. Go to + New icon again. Then, choose to Receive payment.
2. Select the same member in the Customer field.
3. A list of pledges/invoices will show under that member's name. Pick the one that's already paid by tapping the box beside to put a checkmark.
4. Afterward, Save and close.

If you want to run a report about the transactions you created, feel free to read this article: Run reports in QuickBooks Online.

I'm always here willing to lend a hand if you need additional assistance in managing your account. Take care!