diff --git a/src/edit.c b/src/edit.c
index 6a636b9..d4de825 100644
--- a/src/edit.c
+++ b/src/edit.c
@@ -742,7 +742,14 @@
 	    mincol = curwin->w_wcol;
 	    validate_cursor_col();
 
-	    if ((int)curwin->w_wcol < mincol - curbuf->b_p_ts
+	    if (
+#ifdef FEAT_VARTABS
+		(int)curwin->w_wcol < mincol - tabstop_at(
+					  get_nolist_virtcol(), curbuf->b_p_ts,
+							 curbuf->b_p_vts_array)
+#else
+		(int)curwin->w_wcol < mincol - curbuf->b_p_ts
+#endif
 		    && curwin->w_wrow == W_WINROW(curwin)
 						 + curwin->w_height - 1 - p_so
 		    && (curwin->w_cursor.lnum != curwin->w_topline
@@ -9329,23 +9336,31 @@
 	 */
 	if (	   mode == BACKSPACE_CHAR
 		&& ((p_sta && in_indent)
-		    || (get_sts_value() != 0
+		    || ((get_sts_value() != 0
+#ifdef FEAT_VARTABS
+			|| tabstop_count(curbuf->b_p_vsts_array)
+#endif
+			)
 			&& curwin->w_cursor.col > 0
 			&& (*(ml_get_cursor() - 1) == TAB
 			    || (*(ml_get_cursor() - 1) == ' '
 				&& (!*inserted_space_p
 				    || arrow_used))))))
 	{
+#ifndef FEAT_VARTABS
 	    int		ts;
+#endif
 	    colnr_T	vcol;
 	    colnr_T	want_vcol;
 	    colnr_T	start_vcol;
 
 	    *inserted_space_p = FALSE;
+#ifndef FEAT_VARTABS
 	    if (p_sta && in_indent)
 		ts = (int)get_sw_value(curbuf);
 	    else
 		ts = (int)get_sts_value();
+#endif
 	    /* Compute the virtual column where we want to be.  Since
 	     * 'showbreak' may get in the way, need to get the last column of
 	     * the previous character. */
@@ -9354,7 +9369,15 @@
 	    dec_cursor();
 	    getvcol(curwin, &curwin->w_cursor, NULL, NULL, &want_vcol);
 	    inc_cursor();
+#ifdef FEAT_VARTABS
+	    if (p_sta && in_indent)
+		want_vcol = (want_vcol / curbuf->b_p_sw) * curbuf->b_p_sw;
+	    else
+		want_vcol = tabstop_start(want_vcol, curbuf->b_p_sts,
+						     curbuf->b_p_vsts_array);
+#else
 	    want_vcol = (want_vcol / ts) * ts;
+#endif
 
 	    /* delete characters until we are at or before want_vcol */
 	    while (vcol > want_vcol
@@ -10144,10 +10167,22 @@
 #endif
 
     /*
-     * When nothing special, insert TAB like a normal character
+     * When nothing special, insert TAB like a normal character.
      */
     if (!curbuf->b_p_et
+#ifdef FEAT_VARTABS
+	    && !(p_sta && ind
+		/* These five lines mean 'tabstop' != 'shiftwidth' */
+		&& ((tabstop_count(curbuf->b_p_vts_array) > 1)
+		    || (tabstop_count(curbuf->b_p_vts_array) == 1
+		        && tabstop_first(curbuf->b_p_vts_array)
+						       != get_sw_value(curbuf))
+	            || (tabstop_count(curbuf->b_p_vts_array) == 0
+		        && curbuf->b_p_ts != get_sw_value(curbuf))))
+	    && tabstop_count(curbuf->b_p_vsts_array) == 0
+#else
 	    && !(p_sta && ind && curbuf->b_p_ts != get_sw_value(curbuf))
+#endif
 	    && get_sts_value() == 0)
 	return TRUE;
 
@@ -10162,6 +10197,20 @@
 #endif
     AppendToRedobuff((char_u *)"\t");
 
+#ifdef FEAT_VARTABS
+    if (p_sta && ind)		/* insert tab in indent, use 'shiftwidth' */
+    {
+	temp = (int)curbuf->b_p_sw;
+	temp -= get_nolist_virtcol() % temp;
+    }
+    else if (tabstop_count(curbuf->b_p_vsts_array) > 0 || curbuf->b_p_sts > 0)
+	                        /* use 'softtabstop' when set */
+	temp = tabstop_padding(get_nolist_virtcol(), curbuf->b_p_sts,
+						     curbuf->b_p_vsts_array);
+    else			/* otherwise use 'tabstop' */
+	temp = tabstop_padding(get_nolist_virtcol(), curbuf->b_p_ts,
+						     curbuf->b_p_vts_array);
+#else
     if (p_sta && ind)		/* insert tab in indent, use 'shiftwidth' */
 	temp = (int)get_sw_value(curbuf);
     else if (curbuf->b_p_sts != 0) /* use 'softtabstop' when set */
@@ -10169,6 +10218,7 @@
     else			/* otherwise use 'tabstop' */
 	temp = (int)curbuf->b_p_ts;
     temp -= get_nolist_virtcol() % temp;
+#endif
 
     /*
      * Insert the first space with ins_char().	It will delete one char in
@@ -10193,7 +10243,13 @@
     /*
      * When 'expandtab' not set: Replace spaces by TABs where possible.
      */
+#ifdef FEAT_VARTABS
+    if (!curbuf->b_p_et && (tabstop_count(curbuf->b_p_vsts_array) > 0
+                            || get_sts_value() > 0
+			    || (p_sta && ind)))
+#else
     if (!curbuf->b_p_et && (get_sts_value() || (p_sta && ind)))
+#endif
     {
 	char_u		*ptr;
 #ifdef FEAT_VREPLACE