ArrayGator

Google’s Product rich-results guidelines require that the price in your product schema match the price shown to users. 
When WooCommerce is set to “Prices entered excluding tax” this isn’t the case—schema shows the net figure while the shop shows the gross.
Price Schema VAT Fixer plugs that gap:
<ul>
<li>Overrides the WooCommerce structured-data filter (<code>woocommerce_structured_data_product</code>) and injects the correct gross price.</li>
<li>Lets you define a tax-lookup address distinct from the store base location when your shop’s physical location differs from the VAT regime you charge.</li>
<li>No templates touched, no extra database tables.</li>
</ul>
Built for merchants who care about SEO, compliance, and clarity.

Price Schema VAT Fixer

Fixes WooCommerce JSON-LD so product schema shows the same VAT-inclusive price shoppers see.

VATCalculatorPlus

Add a VAT calculator to your WordPress site, using the <a href="http://www.vatcalculatorplus.com" rel="nofollow ugc">VAT Calculator Plus</a> web site widget. You can set a fixed VAT rate or let your visitor set the rate. The VAT calculator has a clean, modern look, and if you are a CSS guru, you can style it totally yourself.
Use the VAT Calculator Plus Settings page to generate a ShortCode that you can copy and paste into your content.

VAT Calculator Plus

Add a VAT calculator widget to your page or post.

Price Schema VAT Fixer vs VAT Calculator Plus