Hello, Steve. Can you please clarify whether the VAT field shows 0%, is blank, or if the tax line is completely missing from the form?
Additionally, does this issue occur for only one specific customer? It's possible that your customer is tax-exempt. I recommend checking to ensure that your customer is set as taxable rather than tax-exempt.
Please also review the individual tax item settings linked to estimates and invoices, as well as the VAT rate settings. Even if the VAT rate is active, VAT will not be calculated if the products/services or the transaction itself are not linked to that rate.
If you meant something different, feel free to return to this thread. I would also appreciate it if you could send a screenshot of what you are seeing. Thank you in advance.