Reconciling old transactions has now changed my Vat

Hello there, @Ian11_2. It's a great pleasure helping you with managing your reconciliation concern in QuickBooks Online (QBO).

Reconciling past transactions in QuickBooks should not directly affect your VAT return. The reconciliation process is primarily focused on ensuring that your bank transactions match your accounting records.

However, it's important to note that if the reconciled transactions are VT-related and were not previously accounted for in your VAT return, reconciling them could potentially impact your VAT reporting. It's crucial to review the reconciled transactions to ensure that they are correctly categorized for VAT purposes. 

For more details, you can refer to this article: Fix issues for accounts you've reconciled in the past in QuickBooks Online.

If you have concerns about how reconciling past transactions may have affected your VAT return,I suggest consulting your accountant or a QuickBooks Certified ProAdvisor. That way, they can guide you with the appropriate process and ensure the accuracy of your books.

Once everything is good, you may continue reconciling your account in QBO. You can refer to the following steps for reference:

• Reconcile account in QuickBooks Online
• Learn the reconcile workflow in QuickBooks
• How do I view, print, or export a reconciliation report?

If there is anything else you need aside from reconciliation, feel free to post a reply. I'm here to guide you. Take care of yourself and have a lovely day!