Dirty fix for WooCommerce rounding problems due to non-round tax values

functions.php

<?php

    /*
     * WooCommerce dirty rounding fix for special tax values (7.7 in Switzerland)
     * Rounding to 0.05 instead of 0.01
     * created by Christoph S. Ackermann
     * https://www.cubetech.ch
     * 05.01.2018
     */

    add_filter( 'woocommerce_get_price_excluding_tax', 'round_price_product', 10, 1 );
    add_filter( 'woocommerce_get_price_including_tax', 'round_price_product', 10, 1 );
    add_filter( 'woocommerce_tax_round', 'round_price_product', 10, 1);
    add_filter( 'woocommerce_get_price', 'round_price_product', 10, 1);
    add_filter( 'woocommerce_calculated_total', 'round_price_product', 10, 1);
    add_filter( 'woocommerce_calculated_subtotal', 'round_price_product', 10, 1);
    add_filter( 'woocommerce_cart_subtotal', 'round_subtotal', 10, 3);

    function round_subtotal( $cart_subtotal, $compound, $instance ) {
        $origValue = $cart_subtotal;
        preg_match( '/\d+\.\d+/', $origValue, $floatValue);
        $roundedValue = number_format( round_price_product( $floatValue[0] ), 2 );
        $returnValue = str_replace( $floatValue, $roundedValue, $origValue );
        return $returnValue;
    }

    function round_price_product( $price ){
        // Return rounded price
        return round( $price * 2, 1 ) / 2;
    }

Hello,
Thank you sooo much for this code!
It's work fine!

I've a question: in the basket, everything goes well except the line: (including CHF 1.76 VAT).
Do you know why?

Thank you have a nice day

Hello Christoph,

I'am using your helpful code to round prices. It's work fine, many thanks.
But I'am experiencing a strange behavior which I am not able to understand and fix, so I give a try to know if you could give to me some help or information. In short, I can't have the woocommerce_cart_item_subtotal (if I'm not wrong for hook's name) rounded the same as the woocommerce_cart_subtotal. You can find an attached picture to see in concrete what I'am describing. Red square 2 displays the price rounded but not the red square 1. I googled a lot but so far did not find any solution. Many, many thanks for your precious help.

Thank you and nice day.
Olivier.

@klloll and @B-Olivier sorry - didn't saw your comments until today.
Still an issue?

Hi!
Is there an update to the script?
I applied this to my latest woocommerce site and it notified me that "woocommerce_get_price" has been deprecated and changed to "woocommerce_product_get_price".

And the script didn't seem to take effect even after I changed the syntax.
It would be nice if we can have an update :)