diff --git a/CHANGELOG.md b/CHANGELOG.md
index cb09e557..285e190c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,12 @@ All notable changes to GOBL will be documented in this file.
 
 The format is based on [Keep a Changelog](http://keepachangelog.com/) and this project adheres to [Semantic Versioning](http://semver.org/). See also the [GOBL versions](https://docs.gobl.org/overview/versions) documentation site for more details.
 
+## [v0.78.1] - 2024-05-30
+
+### Fixed
+
+- CH: fixing tax ID checksum validation that ends in `0`.
+
 ## [v0.78.0] - 2024-05-23
 
 ### Added
diff --git a/regimes/ch/tax_identity.go b/regimes/ch/tax_identity.go
index 9216c004..6b9e110c 100644
--- a/regimes/ch/tax_identity.go
+++ b/regimes/ch/tax_identity.go
@@ -84,6 +84,9 @@ func commercialCheck(val string) error {
 	if total == 10 {
 		return errors.New("invalid code")
 	}
+	if total == 11 {
+		total = 0
+	}
 
 	lastNum := int(val[9] - '0')
 	if lastNum != int(total) {
diff --git a/regimes/ch/tax_identity_test.go b/regimes/ch/tax_identity_test.go
index 578afaec..ec633167 100644
--- a/regimes/ch/tax_identity_test.go
+++ b/regimes/ch/tax_identity_test.go
@@ -57,9 +57,12 @@ func TestValidateTaxIdentity(t *testing.T) {
 		{name: "good 1", code: "E100416306"},
 		{name: "good 2", code: "E284156502"},
 		{name: "good 3", code: "E432825998"},
+		{name: "good 4", code: "E115400550"},
+		{name: "good 5", code: "E424414541"},
+		{name: "good 6", code: "E123456788"},
 		{
 			name: "zeros",
-			code: "E000000000",
+			code: "E000000001",
 			err:  "checksum mismatch",
 		},
 		{
@@ -84,9 +87,14 @@ func TestValidateTaxIdentity(t *testing.T) {
 		},
 		{
 			name: "bad checksum",
-			code: "E116276850",
+			code: "E116276851",
 			err:  "checksum mismatch",
 		},
+		{
+			name: "invalid code",
+			code: "E100426306",
+			err:  "invalid code",
+		},
 	}
 
 	for _, tt := range tests {
diff --git a/version.go b/version.go
index 7fd7957a..be2ed50e 100644
--- a/version.go
+++ b/version.go
@@ -8,7 +8,7 @@ import (
 type Version string
 
 // VERSION is the current version of the GOBL library.
-const VERSION Version = "v0.78.0"
+const VERSION Version = "v0.78.1"
 
 // Semver parses and returns semver
 func (v Version) Semver() *semver.Version {