Fix tax calculation for Ohio, Tax rounding and allow calculating VAT without providing ZIP (#2894)

* Allow round tax at subtotal level, instead of rounding per line

* Allow calculating taxes for VAT countries without providing ZIP

* add OH to nexus_addresses_workaround

* Prevent Undefined variable Notice

* Add changelog entries

Author: bartech

changelog.txt

@@ -1,6 +1,9 @@
 *** WooCommerce Tax Changelog ***
 
 = 3.2.2 - 2025-xx-xx =
+* Add   - Allow round tax at subtotal level, instead of rounding per line.
+* Add   - Allow calculating taxes for VAT countries without providing ZIP.
+* Fix   - Taxes were incorrectly calculated using the store’s base address for Ohio.
 * Fix   - Display TaxJar error notices only after taxes are calculated.
 * Tweak - Log detection of potential incorrect California tax nexus in successful TaxJar API and cached responses.
 

classes/class-wc-connect-taxjar-integration.php

@@ -23,17 +23,15 @@ class WC_Connect_TaxJar_Integration {
 
 	private $expected_options = array(
 		// Users can set either billing or shipping address for tax rates but not shop
-		'woocommerce_tax_based_on'          => 'shipping',
+		'woocommerce_tax_based_on'       => 'shipping',
 		// Rate calculations assume tax not included
-		'woocommerce_prices_include_tax'    => 'no',
+		'woocommerce_prices_include_tax' => 'no',
 		// Use no special handling on shipping taxes, our API handles that
-		'woocommerce_shipping_tax_class'    => '',
-		// API handles rounding precision
-		'woocommerce_tax_round_at_subtotal' => 'no',
+		'woocommerce_shipping_tax_class' => '',
 		// Rates are calculated in the cart assuming tax not included
-		'woocommerce_tax_display_shop'      => 'excl',
+		'woocommerce_tax_display_shop'   => 'excl',
 		// TaxJar returns one total amount, not line item amounts
-		'woocommerce_tax_display_cart'      => 'excl',
+		'woocommerce_tax_display_cart'   => 'excl',
 	);
 
 	/**
@@ -1023,6 +1021,12 @@ public function maybe_apply_taxjar_nexus_addresses_workaround( $body ) {
 				'from_country' => 'US',
 				'from_state'   => 'AZ',
 			),
+			'US-OH' => array(
+				'to_country'   => 'US',
+				'to_state'     => 'OH',
+				'from_country' => 'US',
+				'from_state'   => 'OH',
+			),
 		);
 
 		foreach ( $cases as $case ) {
@@ -1099,7 +1103,7 @@ public function calculate_tax( $options = array() ) {
 		// Strict conditions to be met before API call can be conducted.
 		if (
 			empty( $to_country ) ||
-			empty( $to_zip ) ||
+			( empty( $to_zip ) && ! in_array( $to_country, WC()->countries->get_vat_countries() ) ) ||
 			( empty( $line_items ) && ( empty( $shipping_amount ) ) ) ||
 			WC()->customer->is_vat_exempt()
 		) {
@@ -1441,7 +1445,7 @@ public function smartcalcs_cache_request( $json, $from_state ) {
 			$zip_state_cache_key = strtolower( 'tj_tax_' . $to_zip . '_' . $to_state );
 			$response            = get_transient( $zip_state_cache_key );
 		}
-		$response = $response ? $response : get_transient( $cache_key );
+		$response = ! empty( $response ) ? $response : get_transient( $cache_key );
 		if ( $response && 'CA' !== $from_state ) {
 			// If $from_state is not California, we need to check for incorrect California tax nexus.
 			try {

readme.txt

@@ -71,6 +71,9 @@ This plugin relies on the following external services:
 == Changelog ==
 
 = 3.2.2 - 2025-xx-xx =
+* Add   - Allow round tax at subtotal level, instead of rounding per line.
+* Add   - Allow calculating taxes for VAT countries without providing ZIP.
+* Fix   - Taxes were incorrectly calculated using the store’s base address for Ohio.
 * Fix   - Display TaxJar error notices only after taxes are calculated.
 * Tweak - Log detection of potential incorrect California tax nexus in successful TaxJar API and cached responses.