diff --git a/common_features.mk b/common_features.mk
index f7bdedf2ff..8080113efd 100644
--- a/common_features.mk
+++ b/common_features.mk
@@ -511,11 +511,7 @@ ifneq ($(strip $(CUSTOM_MATRIX)), yes)
     # if 'lite' then skip the actual matrix implementation
     ifneq ($(strip $(CUSTOM_MATRIX)), lite)
         # Include the standard or split matrix code if needed
-        ifeq ($(strip $(SPLIT_KEYBOARD)), yes)
-            QUANTUM_SRC += $(QUANTUM_DIR)/split_common/matrix.c
-        else
-            QUANTUM_SRC += $(QUANTUM_DIR)/matrix.c
-        endif
+        QUANTUM_SRC += $(QUANTUM_DIR)/matrix.c
     endif
 endif
 
diff --git a/quantum/matrix.c b/quantum/matrix.c
index 566d9ff340..ed4643f813 100644
--- a/quantum/matrix.c
+++ b/quantum/matrix.c
@@ -21,15 +21,43 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "matrix.h"
 #include "debounce.h"
 #include "quantum.h"
+#ifdef SPLIT_KEYBOARD
+#    include "split_common/split_util.h"
+#    include "split_common/transactions.h"
+
+#    ifndef ERROR_DISCONNECT_COUNT
+#        define ERROR_DISCONNECT_COUNT 5
+#    endif  // ERROR_DISCONNECT_COUNT
+
+#    define ROWS_PER_HAND (MATRIX_ROWS / 2)
+#else
+#    define ROWS_PER_HAND (MATRIX_ROWS)
+#endif
+
+#ifdef DIRECT_PINS_RIGHT
+#    define SPLIT_MUTABLE
+#else
+#    define SPLIT_MUTABLE const
+#endif
+#ifdef MATRIX_ROW_PINS_RIGHT
+#    define SPLIT_MUTABLE_ROW
+#else
+#    define SPLIT_MUTABLE_ROW const
+#endif
+#ifdef MATRIX_COL_PINS_RIGHT
+#    define SPLIT_MUTABLE_COL
+#else
+#    define SPLIT_MUTABLE_COL const
+#endif
 
 #ifdef DIRECT_PINS
-static pin_t direct_pins[MATRIX_ROWS][MATRIX_COLS] = DIRECT_PINS;
+static SPLIT_MUTABLE pin_t direct_pins[MATRIX_ROWS][MATRIX_COLS] = DIRECT_PINS;
 #elif (DIODE_DIRECTION == ROW2COL) || (DIODE_DIRECTION == COL2ROW)
 #    ifdef MATRIX_ROW_PINS
-static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
+static SPLIT_MUTABLE_ROW pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
 #    endif  // MATRIX_ROW_PINS
 #    ifdef MATRIX_COL_PINS
-static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
+static SPLIT_MUTABLE_COL pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
 #    endif  // MATRIX_COL_PINS
 #endif
 
@@ -37,10 +65,19 @@ static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
 extern matrix_row_t raw_matrix[MATRIX_ROWS];  // raw values
 extern matrix_row_t matrix[MATRIX_ROWS];      // debounced values
 
+#ifdef SPLIT_KEYBOARD
+// row offsets for each hand
+uint8_t thisHand, thatHand;
+#endif
+
 // user-defined overridable functions
 __attribute__((weak)) void matrix_init_pins(void);
 __attribute__((weak)) void matrix_read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row);
 __attribute__((weak)) void matrix_read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col);
+#ifdef SPLIT_KEYBOARD
+__attribute__((weak)) void matrix_slave_scan_kb(void) { matrix_slave_scan_user(); }
+__attribute__((weak)) void matrix_slave_scan_user(void) {}
+#endif
 
 static inline void setPinOutput_writeLow(pin_t pin) {
     ATOMIC_BLOCK_FORCEON {
@@ -192,7 +229,7 @@ __attribute__((weak)) void matrix_read_rows_on_col(matrix_row_t current_matrix[]
     matrix_output_select_delay();
 
     // For each row...
-    for (uint8_t row_index = 0; row_index < MATRIX_ROWS; row_index++) {
+    for (uint8_t row_index = 0; row_index < ROWS_PER_HAND; row_index++) {
         // Check row pin state
         if (readMatrixPin(row_pins[row_index]) == 0) {
             // Pin LO, set col bit
@@ -217,6 +254,37 @@ __attribute__((weak)) void matrix_read_rows_on_col(matrix_row_t current_matrix[]
 #endif
 
 void matrix_init(void) {
+#ifdef SPLIT_KEYBOARD
+    split_pre_init();
+
+    // Set pinout for right half if pinout for that half is defined
+    if (!isLeftHand) {
+#    ifdef DIRECT_PINS_RIGHT
+        const pin_t direct_pins_right[MATRIX_ROWS][MATRIX_COLS] = DIRECT_PINS_RIGHT;
+        for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+            for (uint8_t j = 0; j < MATRIX_COLS; j++) {
+                direct_pins[i][j] = direct_pins_right[i][j];
+            }
+        }
+#    endif
+#    ifdef MATRIX_ROW_PINS_RIGHT
+        const pin_t row_pins_right[MATRIX_ROWS] = MATRIX_ROW_PINS_RIGHT;
+        for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+            row_pins[i] = row_pins_right[i];
+        }
+#    endif
+#    ifdef MATRIX_COL_PINS_RIGHT
+        const pin_t col_pins_right[MATRIX_COLS] = MATRIX_COL_PINS_RIGHT;
+        for (uint8_t i = 0; i < MATRIX_COLS; i++) {
+            col_pins[i] = col_pins_right[i];
+        }
+#    endif
+    }
+
+    thisHand = isLeftHand ? 0 : (ROWS_PER_HAND);
+    thatHand = ROWS_PER_HAND - thisHand;
+#endif
+
     // initialize key pins
     matrix_init_pins();
 
@@ -226,17 +294,62 @@ void matrix_init(void) {
         matrix[i]     = 0;
     }
 
-    debounce_init(MATRIX_ROWS);
+    debounce_init(ROWS_PER_HAND);
 
     matrix_init_quantum();
+
+#ifdef SPLIT_KEYBOARD
+    split_post_init();
+#endif
 }
 
+#ifdef SPLIT_KEYBOARD
+bool matrix_post_scan(void) {
+    bool changed = false;
+    if (is_keyboard_master()) {
+        static uint8_t error_count;
+
+        matrix_row_t slave_matrix[ROWS_PER_HAND] = {0};
+        if (!transport_master(matrix + thisHand, slave_matrix)) {
+            error_count++;
+
+            if (error_count > ERROR_DISCONNECT_COUNT) {
+                // reset other half if disconnected
+                for (int i = 0; i < ROWS_PER_HAND; ++i) {
+                    matrix[thatHand + i] = 0;
+                    slave_matrix[i]      = 0;
+                }
+
+                changed = true;
+            }
+        } else {
+            error_count = 0;
+
+            for (int i = 0; i < ROWS_PER_HAND; ++i) {
+                if (matrix[thatHand + i] != slave_matrix[i]) {
+                    matrix[thatHand + i] = slave_matrix[i];
+                    changed              = true;
+                }
+            }
+        }
+
+        matrix_scan_quantum();
+    } else {
+        transport_slave(matrix + thatHand, matrix + thisHand);
+
+        matrix_slave_scan_kb();
+    }
+
+    return changed;
+}
+#endif
+
 uint8_t matrix_scan(void) {
     matrix_row_t curr_matrix[MATRIX_ROWS] = {0};
 
 #if defined(DIRECT_PINS) || (DIODE_DIRECTION == COL2ROW)
     // Set row, read cols
-    for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
+    for (uint8_t current_row = 0; current_row < ROWS_PER_HAND; current_row++) {
         matrix_read_cols_on_row(curr_matrix, current_row);
     }
 #elif (DIODE_DIRECTION == ROW2COL)
@@ -249,8 +362,12 @@ uint8_t matrix_scan(void) {
     bool changed = memcmp(raw_matrix, curr_matrix, sizeof(curr_matrix)) != 0;
     if (changed) memcpy(raw_matrix, curr_matrix, sizeof(curr_matrix));
 
-    debounce(raw_matrix, matrix, MATRIX_ROWS, changed);
-
+#ifdef SPLIT_KEYBOARD
+    debounce(raw_matrix, matrix + thisHand, ROWS_PER_HAND, changed);
+    changed = (changed || matrix_post_scan());
+#else
+    debounce(raw_matrix, matrix, ROWS_PER_HAND, changed);
     matrix_scan_quantum();
+#endif
     return (uint8_t)changed;
 }
diff --git a/quantum/split_common/matrix.c b/quantum/split_common/matrix.c
deleted file mode 100644
index d8e078e9bb..0000000000
--- a/quantum/split_common/matrix.c
+++ /dev/null
@@ -1,340 +0,0 @@
-/*
-Copyright 2012 Jun Wako <wakojun@gmail.com>
-
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 2 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-#include <stdint.h>
-#include <stdbool.h>
-#include <string.h>
-#include "util.h"
-#include "matrix.h"
-#include "debounce.h"
-#include "quantum.h"
-#include "split_util.h"
-#include "config.h"
-#include "transactions.h"
-
-#ifndef ERROR_DISCONNECT_COUNT
-#    define ERROR_DISCONNECT_COUNT 5
-#endif  // ERROR_DISCONNECT_COUNT
-
-#define ROWS_PER_HAND (MATRIX_ROWS / 2)
-
-#ifdef DIRECT_PINS
-static pin_t direct_pins[MATRIX_ROWS][MATRIX_COLS] = DIRECT_PINS;
-#elif (DIODE_DIRECTION == ROW2COL) || (DIODE_DIRECTION == COL2ROW)
-#    ifdef MATRIX_ROW_PINS
-static pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
-#    endif  // MATRIX_ROW_PINS
-#    ifdef MATRIX_COL_PINS
-static pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
-#    endif  // MATRIX_COL_PINS
-#endif
-
-/* matrix state(1:on, 0:off) */
-extern matrix_row_t raw_matrix[MATRIX_ROWS];  // raw values
-extern matrix_row_t matrix[MATRIX_ROWS];      // debounced values
-
-// row offsets for each hand
-uint8_t thisHand, thatHand;
-
-// user-defined overridable functions
-__attribute__((weak)) void matrix_slave_scan_kb(void) { matrix_slave_scan_user(); }
-__attribute__((weak)) void matrix_slave_scan_user(void) {}
-__attribute__((weak)) void matrix_init_pins(void);
-__attribute__((weak)) void matrix_read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row);
-__attribute__((weak)) void matrix_read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col);
-
-static inline void setPinOutput_writeLow(pin_t pin) {
-    ATOMIC_BLOCK_FORCEON {
-        setPinOutput(pin);
-        writePinLow(pin);
-    }
-}
-
-static inline void setPinInputHigh_atomic(pin_t pin) {
-    ATOMIC_BLOCK_FORCEON { setPinInputHigh(pin); }
-}
-
-static inline uint8_t readMatrixPin(pin_t pin) {
-    if (pin != NO_PIN) {
-        return readPin(pin);
-    } else {
-        return 1;
-    }
-}
-
-// matrix code
-
-#ifdef DIRECT_PINS
-
-__attribute__((weak)) void matrix_init_pins(void) {
-    for (int row = 0; row < MATRIX_ROWS; row++) {
-        for (int col = 0; col < MATRIX_COLS; col++) {
-            pin_t pin = direct_pins[row][col];
-            if (pin != NO_PIN) {
-                setPinInputHigh(pin);
-            }
-        }
-    }
-}
-
-__attribute__((weak)) void matrix_read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) {
-    // Start with a clear matrix row
-    matrix_row_t current_row_value = 0;
-
-    for (uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
-        pin_t pin = direct_pins[current_row][col_index];
-        if (pin != NO_PIN) {
-            current_row_value |= readPin(pin) ? 0 : (MATRIX_ROW_SHIFTER << col_index);
-        }
-    }
-
-    // Update the matrix
-    current_matrix[current_row] = current_row_value;
-}
-
-#elif defined(DIODE_DIRECTION)
-#    if defined(MATRIX_ROW_PINS) && defined(MATRIX_COL_PINS)
-#        if (DIODE_DIRECTION == COL2ROW)
-
-static bool select_row(uint8_t row) {
-    pin_t pin = row_pins[row];
-    if (pin != NO_PIN) {
-        setPinOutput_writeLow(pin);
-        return true;
-    }
-    return false;
-}
-
-static void unselect_row(uint8_t row) {
-    pin_t pin = row_pins[row];
-    if (pin != NO_PIN) {
-        setPinInputHigh_atomic(pin);
-    }
-}
-
-static void unselect_rows(void) {
-    for (uint8_t x = 0; x < ROWS_PER_HAND; x++) {
-        unselect_row(x);
-    }
-}
-
-__attribute__((weak)) void matrix_init_pins(void) {
-    unselect_rows();
-    for (uint8_t x = 0; x < MATRIX_COLS; x++) {
-        if (col_pins[x] != NO_PIN) {
-            setPinInputHigh_atomic(col_pins[x]);
-        }
-    }
-}
-
-__attribute__((weak)) void matrix_read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) {
-    // Start with a clear matrix row
-    matrix_row_t current_row_value = 0;
-
-    if (!select_row(current_row)) {  // Select row
-        return;                      // skip NO_PIN row
-    }
-    matrix_output_select_delay();
-
-    // For each col...
-    for (uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
-        uint8_t pin_state = readMatrixPin(col_pins[col_index]);
-
-        // Populate the matrix row with the state of the col pin
-        current_row_value |= pin_state ? 0 : (MATRIX_ROW_SHIFTER << col_index);
-    }
-
-    // Unselect row
-    unselect_row(current_row);
-    matrix_output_unselect_delay();  // wait for all Col signals to go HIGH
-
-    // Update the matrix
-    current_matrix[current_row] = current_row_value;
-}
-
-#        elif (DIODE_DIRECTION == ROW2COL)
-
-static bool select_col(uint8_t col) {
-    pin_t pin = col_pins[col];
-    if (pin != NO_PIN) {
-        setPinOutput_writeLow(pin);
-        return true;
-    }
-    return false;
-}
-
-static void unselect_col(uint8_t col) {
-    pin_t pin = col_pins[col];
-    if (pin != NO_PIN) {
-        setPinInputHigh_atomic(pin);
-    }
-}
-
-static void unselect_cols(void) {
-    for (uint8_t x = 0; x < MATRIX_COLS; x++) {
-        unselect_col(x);
-    }
-}
-
-__attribute__((weak)) void matrix_init_pins(void) {
-    unselect_cols();
-    for (uint8_t x = 0; x < ROWS_PER_HAND; x++) {
-        if (row_pins[x] != NO_PIN) {
-            setPinInputHigh_atomic(row_pins[x]);
-        }
-    }
-}
-
-__attribute__((weak)) void matrix_read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col) {
-    // Select col
-    if (!select_col(current_col)) {  // select col
-        return;                      // skip NO_PIN col
-    }
-    matrix_output_select_delay();
-
-    // For each row...
-    for (uint8_t row_index = 0; row_index < ROWS_PER_HAND; row_index++) {
-        // Check row pin state
-        if (readMatrixPin(row_pins[row_index]) == 0) {
-            // Pin LO, set col bit
-            current_matrix[row_index] |= (MATRIX_ROW_SHIFTER << current_col);
-        } else {
-            // Pin HI, clear col bit
-            current_matrix[row_index] &= ~(MATRIX_ROW_SHIFTER << current_col);
-        }
-    }
-
-    // Unselect col
-    unselect_col(current_col);
-    matrix_output_unselect_delay();  // wait for all Row signals to go HIGH
-}
-
-#        else
-#            error DIODE_DIRECTION must be one of COL2ROW or ROW2COL!
-#        endif
-#    endif  // defined(MATRIX_ROW_PINS) && defined(MATRIX_COL_PINS)
-#else
-#    error DIODE_DIRECTION is not defined!
-#endif
-
-void matrix_init(void) {
-    split_pre_init();
-
-    // Set pinout for right half if pinout for that half is defined
-    if (!isLeftHand) {
-#ifdef DIRECT_PINS_RIGHT
-        const pin_t direct_pins_right[MATRIX_ROWS][MATRIX_COLS] = DIRECT_PINS_RIGHT;
-        for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
-            for (uint8_t j = 0; j < MATRIX_COLS; j++) {
-                direct_pins[i][j] = direct_pins_right[i][j];
-            }
-        }
-#endif
-#ifdef MATRIX_ROW_PINS_RIGHT
-        const pin_t row_pins_right[MATRIX_ROWS] = MATRIX_ROW_PINS_RIGHT;
-        for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
-            row_pins[i] = row_pins_right[i];
-        }
-#endif
-#ifdef MATRIX_COL_PINS_RIGHT
-        const pin_t col_pins_right[MATRIX_COLS] = MATRIX_COL_PINS_RIGHT;
-        for (uint8_t i = 0; i < MATRIX_COLS; i++) {
-            col_pins[i] = col_pins_right[i];
-        }
-#endif
-    }
-
-    thisHand = isLeftHand ? 0 : (ROWS_PER_HAND);
-    thatHand = ROWS_PER_HAND - thisHand;
-
-    // initialize key pins
-    matrix_init_pins();
-
-    // initialize matrix state: all keys off
-    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
-        raw_matrix[i] = 0;
-        matrix[i]     = 0;
-    }
-
-    debounce_init(ROWS_PER_HAND);
-
-    matrix_init_quantum();
-
-    split_post_init();
-}
-
-bool matrix_post_scan(void) {
-    bool changed = false;
-    if (is_keyboard_master()) {
-        static uint8_t error_count;
-
-        matrix_row_t slave_matrix[ROWS_PER_HAND] = {0};
-        if (!transport_master(matrix + thisHand, slave_matrix)) {
-            error_count++;
-
-            if (error_count > ERROR_DISCONNECT_COUNT) {
-                // reset other half if disconnected
-                for (int i = 0; i < ROWS_PER_HAND; ++i) {
-                    matrix[thatHand + i] = 0;
-                    slave_matrix[i]      = 0;
-                }
-
-                changed = true;
-            }
-        } else {
-            error_count = 0;
-
-            for (int i = 0; i < ROWS_PER_HAND; ++i) {
-                if (matrix[thatHand + i] != slave_matrix[i]) {
-                    matrix[thatHand + i] = slave_matrix[i];
-                    changed              = true;
-                }
-            }
-        }
-
-        matrix_scan_quantum();
-    } else {
-        transport_slave(matrix + thatHand, matrix + thisHand);
-
-        matrix_slave_scan_kb();
-    }
-
-    return changed;
-}
-
-uint8_t matrix_scan(void) {
-    matrix_row_t curr_matrix[MATRIX_ROWS] = {0};
-
-#if defined(DIRECT_PINS) || (DIODE_DIRECTION == COL2ROW)
-    // Set row, read cols
-    for (uint8_t current_row = 0; current_row < ROWS_PER_HAND; current_row++) {
-        matrix_read_cols_on_row(curr_matrix, current_row);
-    }
-#elif (DIODE_DIRECTION == ROW2COL)
-    // Set col, read rows
-    for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) {
-        matrix_read_rows_on_col(curr_matrix, current_col);
-    }
-#endif
-
-    bool local_changed = memcmp(raw_matrix, curr_matrix, sizeof(curr_matrix)) != 0;
-    if (local_changed) memcpy(raw_matrix, curr_matrix, sizeof(curr_matrix));
-
-    debounce(raw_matrix, matrix + thisHand, ROWS_PER_HAND, local_changed);
-
-    bool remote_changed = matrix_post_scan();
-    return (uint8_t)(local_changed || remote_changed);
-}