I appreciate the screenshots, Ssc2020. It helped me understand your concern more.
It looks like your default tax rate is No VAT. It can be the reason why you're unable to select a VAT code when you create an expense transaction.
Let me guide you on how we can change it:
- Click the Gear icon.
- Select Account and settings.
- Go to the Advanced tab.
- Click the Pencil icon in the Accounting section.
- In the Default tax rate selection section, select either Exclusive of Tax or Inclusive of Tax.
- Click Save, then Done.
Once done, you can create the expense transaction so you can declare the tax.
If there's anything else that you need, don't hesitate to let us know. We'll be around to assist you. Take care!