Custom prices

function france_price_with_vat() {
    $product_id = get_the_ID();
    if ( ! $product_id ) return;

    $product = wc_get_product( $product_id );
    if ( ! $product ) return;

    // Get WooCommerce setting (if prices include tax)
    $prices_include_tax = get_option( 'woocommerce_prices_include_tax' ) === 'yes';

    // VAT rates
    $germany_vat = 1.19;
    $france_vat = 1.20;

    // Product price
    $price = floatval( $product->get_price() );

    if ( $prices_include_tax ) {
       // Remove Germany VAT, then apply France VAT
       $price_excl = $price / $germany_vat;
       $france_price = $price_excl * $france_vat;
    } else {
       // Add France VAT directly if price is excluding tax
       $france_price = $price * $france_vat;
    }

    return number_format( $france_price, 2 );
}