diff --git a/include/openthread/types.h b/include/openthread/types.h
index acd14c7b1..cf2abf669 100644
--- a/include/openthread/types.h
+++ b/include/openthread/types.h
@@ -953,6 +953,7 @@ typedef struct otMacCounters
     uint32_t mTxRetry;                ///< The number of retransmission times.
     uint32_t mTxErrCca;               ///< The number of CCA failure times.
     uint32_t mTxErrAbort;             ///< The number of frame transmission failures due to abort error.
+    uint32_t mTxErrBusyChannel;       ///< The number of frames that were dropped due to a busy channel.
     uint32_t mRxTotal;                ///< The total number of received packets.
     uint32_t mRxUnicast;              ///< The total number of unicast packets received.
     uint32_t mRxBroadcast;            ///< The total number of broadcast packets received.
diff --git a/src/cli/cli.cpp b/src/cli/cli.cpp
index bb2e10af8..a801517cb 100644
--- a/src/cli/cli.cpp
+++ b/src/cli/cli.cpp
@@ -667,6 +667,7 @@ void Interpreter::ProcessCounters(int argc, char *argv[])
             mServer->OutputFormat("    TxOther: %d\r\n", counters->mTxOther);
             mServer->OutputFormat("    TxRetry: %d\r\n", counters->mTxRetry);
             mServer->OutputFormat("    TxErrCca: %d\r\n", counters->mTxErrCca);
+            mServer->OutputFormat("    TxErrBusyChannel: %d\r\n", counters->mTxErrBusyChannel);
             mServer->OutputFormat("RxTotal: %d\r\n", counters->mRxTotal);
             mServer->OutputFormat("    RxUnicast: %d\r\n", counters->mRxUnicast);
             mServer->OutputFormat("    RxBroadcast: %d\r\n", counters->mRxBroadcast);
diff --git a/src/core/mac/mac.cpp b/src/core/mac/mac.cpp
index 37775cf07..f0e6078f8 100644
--- a/src/core/mac/mac.cpp
+++ b/src/core/mac/mac.cpp
@@ -991,8 +991,6 @@ void Mac::TransmitDoneTask(otRadioFrame *aFrame, otRadioFrame *aAckFrame, otErro
 
     mMacTimer.Stop();
 
-    mCounters.mTxTotal++;
-
     txFrame->GetDstAddr(addr);
 
     if (aError == OT_ERROR_NONE && txFrame->GetAckRequest() && aAckFrame != NULL)
@@ -1009,17 +1007,6 @@ void Mac::TransmitDoneTask(otRadioFrame *aFrame, otRadioFrame *aAckFrame, otErro
         }
     }
 
-    if (addr.mShortAddress == kShortAddrBroadcast)
-    {
-        // Broadcast frame
-        mCounters.mTxBroadcast++;
-    }
-    else
-    {
-        // Unicast frame
-        mCounters.mTxUnicast++;
-    }
-
     if (aError == OT_ERROR_ABORT)
     {
         mCounters.mTxErrAbort++;
@@ -1171,8 +1158,6 @@ void Mac::HandleMacTimer(Timer &aTimer)
 
 void Mac::HandleMacTimer(void)
 {
-    Address addr;
-
     switch (mOperation)
     {
     case kOperationActiveScan:
@@ -1200,21 +1185,6 @@ void Mac::HandleMacTimer(void)
 
     case kOperationTransmitData:
         otLogDebgMac(GetInstance(), "Ack timer fired");
-        mCounters.mTxTotal++;
-
-        mTxFrame->GetDstAddr(addr);
-
-        if (addr.mShortAddress == kShortAddrBroadcast)
-        {
-            // Broadcast frame
-            mCounters.mTxBroadcast++;
-        }
-        else
-        {
-            // Unicast Frame
-            mCounters.mTxUnicast++;
-        }
-
         SentFrame(OT_ERROR_NO_ACK);
         break;
 
@@ -1263,6 +1233,7 @@ void Mac::SentFrame(otError aError)
 {
     Frame &sendFrame(*mTxFrame);
     Sender *sender;
+    Address addr;
 
     mTransmitAttempts++;
 
@@ -1302,6 +1273,26 @@ void Mac::SentFrame(otError aError)
     mTransmitAttempts = 0;
     mCsmaAttempts = 0;
 
+    mCounters.mTxTotal++;
+
+    if (aError == OT_ERROR_CHANNEL_ACCESS_FAILURE)
+    {
+        mCounters.mTxErrBusyChannel++;
+    }
+
+    mTxFrame->GetDstAddr(addr);
+
+    if (addr.mShortAddress == kShortAddrBroadcast)
+    {
+        // Broadcast frame
+        mCounters.mTxBroadcast++;
+    }
+    else
+    {
+        // Unicast Frame
+        mCounters.mTxUnicast++;
+    }
+
     if (sendFrame.GetAckRequest())
     {
         mCounters.mTxAckRequested++;