Takze som to upravil a uz to viac menej funguje ako ma jediny detail a sice podstatny je v tom ze mi to nechce aktualizovat cenu vzhladom na variantu produktu.
add_filter('woocommerce_get_price_html', 'edit_price_display', 10, 2);
function edit_price_display($price, $instance) {
	global $product;
   if(is_a( $product, 'WC_Product_Variable' )) {
				$prefix = sprintf('%s: ', __('Od', 'wcvp_range'));
                $postfix = ' s DPH';
	            $postfix_without = ' bez DPH';
				$wcv_reg_min_price = $product->get_variation_regular_price( 'min', true );
				$wcv_min_sale_price    = $product->get_variation_sale_price( 'min', true );
				$wcv_max_price = $product->get_variation_price( 'max', true );
				$wcv_min_price = $product->get_variation_price( 'min', true );
	            $float_value_of_var = floatval($wcv_min_price);
                $price_incl_tax = $float_value_of_var + round($float_value_of_var * ( 20 / 100 ), 3);
				$price_incl_tax = number_format($price_incl_tax, 3, ",", ".");
	
				$wcv_price = ( $wcv_min_sale_price == $wcv_reg_min_price ) ?
             
				wc_price( $wcv_reg_min_price ) :
				'<del>' . wc_price( $wcv_reg_min_price ) . '</del>' . '<ins>' . wc_price( $wcv_min_sale_price ) . '</ins>';
				return ( $wcv_min_price == $wcv_max_price )?
				$wcv_price :
				sprintf('%s%s%s%s%s%s', $prefix, $price_incl_tax, $postfix,'</br>', $price_incl_tax, $postfix_without);
	
   }else{
	   
   	$price = $product->price;
				$price_incl_tax = $price + round($price * ( 20 / 100 ), 3);
				$price_incl_tax = number_format($price_incl_tax, 3, ",", ".");
				$price = number_format($price, 3, ",", ".");
				$display_price = '<span class="price">';
				$display_price .= '<span class="amount">' . $price_incl_tax .' € <small class="woocommerce-price-suffix"> s DPH</small></span>';
				$display_price .= '<br>';
				$display_price .= '<span class="amount" style = "font-size: 13px; color: #767676;"> ' . $price .'€<small class="woocommerce-price-suffix" style = "font-size: 13px; color: #767676;">                    bez DPH</small></span>';
				$display_price .= '</span>';
				echo $display_price;
   }
}