diff --git a/hyprtester/src/tests/main/tags.cpp b/hyprtester/src/tests/main/tags.cpp
new file mode 100644
index 00000000..22bedcde
--- /dev/null
+++ b/hyprtester/src/tests/main/tags.cpp
@@ -0,0 +1,48 @@
+#include "../../shared.hpp"
+#include "../../hyprctlCompat.hpp"
+#include "../shared.hpp"
+#include "tests.hpp"
+
+static int  ret = 0;
+
+static bool testTags() {
+    NLog::log("{}Testing tags", Colors::GREEN);
+
+    EXPECT(Tests::windowCount(), 0);
+
+    NLog::log("{}Spawning kittyProcA&B on ws 1", Colors::YELLOW);
+    auto kittyProcA = Tests::spawnKitty("tagged");
+    auto kittyProcB = Tests::spawnKitty("untagged");
+
+    if (!kittyProcA || !kittyProcB) {
+        NLog::log("{}Error: kitty did not spawn", Colors::RED);
+        return false;
+    }
+
+    NLog::log("{}Testing testTag tags", Colors::YELLOW);
+
+    OK(getFromSocket("/keyword windowrule tag +testTag, class:tagged"));
+    OK(getFromSocket("/keyword windowrule noshadow, tag:negative:testTag"));
+    OK(getFromSocket("/keyword windowrule noborder, tag:testTag"));
+
+    EXPECT(Tests::windowCount(), 2);
+    OK(getFromSocket("/dispatch focuswindow class:tagged"));
+    NLog::log("{}Testing tagged window for noborder & noshadow", Colors::YELLOW);
+    EXPECT_CONTAINS(getFromSocket("/activewindow"), "testTag");
+    EXPECT_CONTAINS(getFromSocket("/getprop activewindow noborder"), "true");
+    EXPECT_CONTAINS(getFromSocket("/getprop activewindow noshadow"), "false");
+    NLog::log("{}Testing untagged window for noborder & noshadow", Colors::YELLOW);
+    OK(getFromSocket("/dispatch focuswindow class:untagged"));
+    EXPECT_NOT_CONTAINS(getFromSocket("/activewindow"), "testTag");
+    EXPECT_CONTAINS(getFromSocket("/getprop activewindow noborder"), "false");
+    EXPECT_CONTAINS(getFromSocket("/getprop activewindow noshadow"), "true");
+
+    Tests::killAllWindows();
+    EXPECT(Tests::windowCount(), 0);
+
+    OK(getFromSocket("/reload"));
+
+    return ret == 0;
+}
+
+REGISTER_TEST_FN(testTags)
diff --git a/src/helpers/TagKeeper.cpp b/src/helpers/TagKeeper.cpp
index f960accb..3c7071d5 100644
--- a/src/helpers/TagKeeper.cpp
+++ b/src/helpers/TagKeeper.cpp
@@ -1,7 +1,10 @@
 #include "TagKeeper.hpp"
 
 bool CTagKeeper::isTagged(const std::string& tag, bool strict) {
-    return m_tags.contains(tag) || (!strict && m_tags.contains(tag + "*"));
+    const bool NEGATIVE = tag.starts_with("negative");
+    const auto MATCH    = NEGATIVE ? tag.substr(9) : tag;
+    const bool TAGGED   = m_tags.contains(MATCH) || (!strict && m_tags.contains(MATCH + "*"));
+    return NEGATIVE ? !TAGGED : TAGGED;
 }
 
 bool CTagKeeper::applyTag(const std::string& tag, bool dynamic) {