diff --git a/pos/blueprints/cashregister_bp.py b/pos/blueprints/cashregister_bp.py
new file mode 100644
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+++ b/pos/blueprints/cashregister_bp.py
@@ -0,0 +1,563 @@
+# /home/Autopartes/pos/blueprints/cashregister_bp.py
+"""Cash register blueprint: open/close register, cash movements, X/Z cuts."""
+
+from datetime import datetime
+from flask import Blueprint, request, jsonify, g
+from middleware import require_auth
+from tenant_db import get_tenant_conn
+from services.audit import log_action
+
+cashregister_bp = Blueprint('cashregister', __name__, url_prefix='/pos/api/register')
+
+
+@cashregister_bp.route('/open', methods=['POST'])
+@require_auth('pos.sell')
+def open_register():
+    """Open a cash register session.
+
+    Body: {register_number: int, opening_amount: float}
+
+    Business rules:
+    - An employee can only have one open register at a time
+    - Register number identifies the physical register (1, 2, 3...)
+    """
+    data = request.get_json() or {}
+    register_number = data.get('register_number')
+    opening_amount = float(data.get('opening_amount', 0))
+
+    if not register_number:
+        return jsonify({'error': 'register_number required'}), 400
+    if opening_amount < 0:
+        return jsonify({'error': 'opening_amount cannot be negative'}), 400
+
+    conn = get_tenant_conn(g.tenant_id)
+    cur = conn.cursor()
+
+    # Check if employee already has an open register
+    cur.execute("""
+        SELECT id, register_number FROM cash_registers
+        WHERE employee_id = %s AND status = 'open'
+    """, (g.employee_id,))
+    existing = cur.fetchone()
+    if existing:
+        cur.close(); conn.close()
+        return jsonify({
+            'error': f'You already have register #{existing[1]} open (id={existing[0]}). Close it first.'
+        }), 409
+
+    # Check if this register number is already open at this branch
+    cur.execute("""
+        SELECT id, employee_id FROM cash_registers
+        WHERE branch_id = %s AND register_number = %s AND status = 'open'
+    """, (g.branch_id, register_number))
+    in_use = cur.fetchone()
+    if in_use:
+        cur.close(); conn.close()
+        return jsonify({'error': f'Register #{register_number} is already open by another employee'}), 409
+
+    try:
+        cur.execute("""
+            INSERT INTO cash_registers
+                (branch_id, employee_id, register_number, opening_amount, status)
+            VALUES (%s,%s,%s,%s,'open')
+            RETURNING id, opened_at
+        """, (g.branch_id, g.employee_id, register_number, opening_amount))
+        reg_id, opened_at = cur.fetchone()
+
+        log_action(conn, 'REGISTER_OPEN', 'cash_register', reg_id,
+                   new_value={'register_number': register_number, 'opening_amount': opening_amount})
+
+        conn.commit()
+        cur.close(); conn.close()
+        return jsonify({
+            'id': reg_id,
+            'register_number': register_number,
+            'opening_amount': opening_amount,
+            'opened_at': str(opened_at),
+            'message': f'Register #{register_number} opened'
+        }), 201
+
+    except Exception as e:
+        conn.rollback()
+        cur.close(); conn.close()
+        return jsonify({'error': str(e)}), 500
+
+
+@cashregister_bp.route('/current', methods=['GET'])
+@require_auth('pos.sell')
+def current_register():
+    """Get the current open register for this employee."""
+    conn = get_tenant_conn(g.tenant_id)
+    cur = conn.cursor()
+
+    cur.execute("""
+        SELECT cr.id, cr.register_number, cr.opening_amount, cr.opened_at,
+               cr.branch_id, b.name as branch_name
+        FROM cash_registers cr
+        LEFT JOIN branches b ON cr.branch_id = b.id
+        WHERE cr.employee_id = %s AND cr.status = 'open'
+    """, (g.employee_id,))
+    row = cur.fetchone()
+
+    if not row:
+        cur.close(); conn.close()
+        return jsonify({'register': None, 'message': 'No open register'})
+
+    register = {
+        'id': row[0], 'register_number': row[1],
+        'opening_amount': float(row[2]) if row[2] else 0,
+        'opened_at': str(row[3]),
+        'branch_id': row[4], 'branch_name': row[5],
+    }
+
+    cur.close(); conn.close()
+    return jsonify({'register': register})
+
+
+@cashregister_bp.route('/movement', methods=['POST'])
+@require_auth('pos.sell')
+def cash_movement():
+    """Record a cash in/out movement with mandatory reason.
+
+    Body: {type: 'in'|'out', amount: float, reason: str}
+    """
+    data = request.get_json() or {}
+    mov_type = data.get('type')
+    amount = float(data.get('amount', 0))
+    reason = data.get('reason', '').strip()
+
+    if mov_type not in ('in', 'out'):
+        return jsonify({'error': "type must be 'in' or 'out'"}), 400
+    if amount <= 0:
+        return jsonify({'error': 'amount must be positive'}), 400
+    if not reason or len(reason) < 3:
+        return jsonify({'error': 'reason required (min 3 characters)'}), 400
+
+    conn = get_tenant_conn(g.tenant_id)
+    cur = conn.cursor()
+
+    # Get employee's open register
+    cur.execute("""
+        SELECT id FROM cash_registers
+        WHERE employee_id = %s AND status = 'open'
+    """, (g.employee_id,))
+    reg = cur.fetchone()
+    if not reg:
+        cur.close(); conn.close()
+        return jsonify({'error': 'No open register. Open a register first.'}), 400
+
+    register_id = reg[0]
+
+    try:
+        cur.execute("""
+            INSERT INTO cash_movements (register_id, type, amount, reason, employee_id)
+            VALUES (%s,%s,%s,%s,%s)
+            RETURNING id, created_at
+        """, (register_id, mov_type, amount, reason, g.employee_id))
+        mov_id, created_at = cur.fetchone()
+
+        log_action(conn, f'CASH_{mov_type.upper()}', 'cash_register', register_id,
+                   new_value={'movement_id': mov_id, 'type': mov_type,
+                              'amount': amount, 'reason': reason})
+
+        conn.commit()
+        cur.close(); conn.close()
+        return jsonify({
+            'id': mov_id,
+            'type': mov_type,
+            'amount': amount,
+            'reason': reason,
+            'created_at': str(created_at),
+            'message': 'Movement recorded'
+        }), 201
+
+    except Exception as e:
+        conn.rollback()
+        cur.close(); conn.close()
+        return jsonify({'error': str(e)}), 500
+
+
+def _compute_register_summary(conn, register_id):
+    """Compute the register summary for X-cut or Z-cut.
+
+    Returns a dict with totals by payment method, cash movements, and expected cash amount.
+    """
+    cur = conn.cursor()
+
+    # Get register info
+    cur.execute("""
+        SELECT opening_amount, opened_at, employee_id
+        FROM cash_registers WHERE id = %s
+    """, (register_id,))
+    reg = cur.fetchone()
+    opening_amount = float(reg[0]) if reg[0] else 0
+
+    # Sales totals by payment method
+    cur.execute("""
+        SELECT payment_method, COUNT(*), COALESCE(SUM(total), 0)
+        FROM sales
+        WHERE register_id = %s AND status = 'completed'
+        GROUP BY payment_method
+    """, (register_id,))
+    sales_by_method = {}
+    total_sales = 0.0
+    total_sales_count = 0
+    for r in cur.fetchall():
+        method, count, amount = r[0], r[1], float(r[2])
+        sales_by_method[method] = {'count': count, 'amount': amount}
+        total_sales += amount
+        total_sales_count += count
+
+    # Cash sales specifically (for expected cash calculation)
+    cash_from_sales = sales_by_method.get('efectivo', {}).get('amount', 0)
+
+    # Change given (cash out)
+    cur.execute("""
+        SELECT COALESCE(SUM(change_given), 0) FROM sales
+        WHERE register_id = %s AND status = 'completed' AND payment_method = 'efectivo'
+    """, (register_id,))
+    change_given = float(cur.fetchone()[0])
+
+    # Cash movements
+    cur.execute("""
+        SELECT type, COALESCE(SUM(amount), 0) FROM cash_movements
+        WHERE register_id = %s GROUP BY type
+    """, (register_id,))
+    movements = {'in': 0.0, 'out': 0.0}
+    for r in cur.fetchall():
+        movements[r[0]] = float(r[1])
+
+    # Cancelled sales
+    cur.execute("""
+        SELECT COUNT(*), COALESCE(SUM(total), 0) FROM sales
+        WHERE register_id = %s AND status = 'cancelled'
+    """, (register_id,))
+    cancelled = cur.fetchone()
+    cancelled_count = cancelled[0]
+    cancelled_amount = float(cancelled[1])
+
+    # Expected cash = opening + cash sales - change + cash_in - cash_out
+    expected_cash = round(
+        opening_amount + cash_from_sales - change_given + movements['in'] - movements['out'],
+        2
+    )
+
+    # Detail of cash movements
+    cur.execute("""
+        SELECT id, type, amount, reason, created_at
+        FROM cash_movements WHERE register_id = %s ORDER BY created_at
+    """, (register_id,))
+    movement_detail = []
+    for r in cur.fetchall():
+        movement_detail.append({
+            'id': r[0], 'type': r[1], 'amount': float(r[2]),
+            'reason': r[3], 'created_at': str(r[4])
+        })
+
+    cur.close()
+
+    return {
+        'opening_amount': opening_amount,
+        'sales_by_method': sales_by_method,
+        'total_sales': round(total_sales, 2),
+        'total_sales_count': total_sales_count,
+        'cash_from_sales': round(cash_from_sales, 2),
+        'change_given': round(change_given, 2),
+        'cash_movements_in': round(movements['in'], 2),
+        'cash_movements_out': round(movements['out'], 2),
+        'movement_detail': movement_detail,
+        'cancelled_count': cancelled_count,
+        'cancelled_amount': round(cancelled_amount, 2),
+        'expected_cash': expected_cash,
+    }
+
+
+@cashregister_bp.route('/cut-x', methods=['GET'])
+@require_auth('pos.sell')
+def cut_x():
+    """Partial cut (corte X): read-only summary without closing the register."""
+    conn = get_tenant_conn(g.tenant_id)
+    cur = conn.cursor()
+
+    cur.execute("""
+        SELECT id FROM cash_registers
+        WHERE employee_id = %s AND status = 'open'
+    """, (g.employee_id,))
+    reg = cur.fetchone()
+    if not reg:
+        cur.close(); conn.close()
+        return jsonify({'error': 'No open register'}), 400
+
+    register_id = reg[0]
+    summary = _compute_register_summary(conn, register_id)
+
+    cur.close(); conn.close()
+    return jsonify({
+        'type': 'X',
+        'register_id': register_id,
+        'status': 'open',
+        **summary,
+    })
+
+
+@cashregister_bp.route('/cut-z', methods=['POST'])
+@require_auth('pos.sell')
+def cut_z():
+    """Final cut (corte Z): close the register.
+
+    Body: {closing_amount: float}  (the amount physically counted in the register)
+    """
+    data = request.get_json() or {}
+    closing_amount = float(data.get('closing_amount', 0))
+
+    conn = get_tenant_conn(g.tenant_id)
+    cur = conn.cursor()
+
+    cur.execute("""
+        SELECT id FROM cash_registers
+        WHERE employee_id = %s AND status = 'open'
+    """, (g.employee_id,))
+    reg = cur.fetchone()
+    if not reg:
+        cur.close(); conn.close()
+        return jsonify({'error': 'No open register'}), 400
+
+    register_id = reg[0]
+    summary = _compute_register_summary(conn, register_id)
+
+    expected = summary['expected_cash']
+    difference = round(closing_amount - expected, 2)
+
+    try:
+        cur.execute("""
+            UPDATE cash_registers
+            SET closing_amount = %s, expected_amount = %s, difference = %s,
+                status = 'closed', closed_at = NOW()
+            WHERE id = %s
+        """, (closing_amount, expected, difference, register_id))
+
+        log_action(conn, 'REGISTER_CLOSE', 'cash_register', register_id,
+                   new_value={
+                       'closing_amount': closing_amount,
+                       'expected_amount': expected,
+                       'difference': difference,
+                       'total_sales': summary['total_sales'],
+                   })
+
+        conn.commit()
+        cur.close(); conn.close()
+
+        return jsonify({
+            'type': 'Z',
+            'register_id': register_id,
+            'status': 'closed',
+            'closing_amount': closing_amount,
+            'expected_amount': expected,
+            'difference': difference,
+            **summary,
+        })
+
+    except Exception as e:
+        conn.rollback()
+        cur.close(); conn.close()
+        return jsonify({'error': str(e)}), 500
+
+
+@cashregister_bp.route('/history', methods=['GET'])
+@require_auth('pos.view')
+def register_history():
+    """List closed registers with summary.
+
+    Query params: date_from, date_to, employee_id, page, per_page
+    """
+    conn = get_tenant_conn(g.tenant_id)
+    cur = conn.cursor()
+
+    page = int(request.args.get('page', 1))
+    per_page = min(int(request.args.get('per_page', 50)), 200)
+
+    where_clauses = ["cr.status = 'closed'"]
+    params = []
+
+    if g.branch_id:
+        where_clauses.append("cr.branch_id = %s")
+        params.append(g.branch_id)
+
+    date_from = request.args.get('date_from')
+    date_to = request.args.get('date_to')
+    employee_id = request.args.get('employee_id')
+
+    if date_from:
+        where_clauses.append("cr.closed_at >= %s")
+        params.append(date_from)
+    if date_to:
+        where_clauses.append("cr.closed_at < %s::date + interval '1 day'")
+        params.append(date_to)
+    if employee_id:
+        where_clauses.append("cr.employee_id = %s")
+        params.append(int(employee_id))
+
+    where = " AND ".join(where_clauses)
+
+    cur.execute(f"SELECT count(*) FROM cash_registers cr WHERE {where}", params)
+    total = cur.fetchone()[0]
+
+    cur.execute(f"""
+        SELECT cr.id, cr.register_number, cr.opening_amount, cr.closing_amount,
+               cr.expected_amount, cr.difference, cr.opened_at, cr.closed_at,
+               cr.employee_id, e.name as employee_name
+        FROM cash_registers cr
+        LEFT JOIN employees e ON cr.employee_id = e.id
+        WHERE {where}
+        ORDER BY cr.closed_at DESC
+        LIMIT %s OFFSET %s
+    """, params + [per_page, (page - 1) * per_page])
+
+    registers = []
+    for r in cur.fetchall():
+        registers.append({
+            'id': r[0], 'register_number': r[1],
+            'opening_amount': float(r[2]) if r[2] else 0,
+            'closing_amount': float(r[3]) if r[3] else 0,
+            'expected_amount': float(r[4]) if r[4] else 0,
+            'difference': float(r[5]) if r[5] else 0,
+            'opened_at': str(r[6]), 'closed_at': str(r[7]),
+            'employee_id': r[8], 'employee_name': r[9],
+        })
+
+    cur.close(); conn.close()
+
+    total_pages = (total + per_page - 1) // per_page
+    return jsonify({
+        'data': registers,
+        'pagination': {'page': page, 'per_page': per_page, 'total': total, 'total_pages': total_pages}
+    })
+
+
+@cashregister_bp.route('/daily-summary', methods=['GET'])
+@require_auth('pos.view')
+def daily_summary():
+    """Consolidated daily summary across all registers for a given date.
+
+    Query params:
+        date: YYYY-MM-DD (default: today)
+
+    Returns aggregated totals: total sales, total by payment method,
+    total movements, and per-register breakdown.
+    """
+    from datetime import date as date_type
+    target_date = request.args.get('date', date_type.today().isoformat())
+
+    conn = get_tenant_conn(g.tenant_id)
+    cur = conn.cursor()
+
+    branch_clause = ""
+    params = [target_date, target_date]
+    if g.branch_id:
+        branch_clause = "AND s.branch_id = %s"
+        params.append(g.branch_id)
+
+    # Total sales by payment method for the date
+    cur.execute(f"""
+        SELECT s.payment_method, COUNT(*), COALESCE(SUM(s.total), 0)
+        FROM sales s
+        WHERE s.created_at >= %s::date
+          AND s.created_at < %s::date + interval '1 day'
+          AND s.status = 'completed'
+          {branch_clause}
+        GROUP BY s.payment_method
+    """, params)
+
+    sales_by_method = {}
+    total_sales = 0.0
+    total_sales_count = 0
+    for method, count, amount in cur.fetchall():
+        sales_by_method[method] = {'count': count, 'amount': float(amount)}
+        total_sales += float(amount)
+        total_sales_count += count
+
+    # Cancelled sales
+    cancel_params = [target_date, target_date]
+    if g.branch_id:
+        cancel_params.append(g.branch_id)
+    cur.execute(f"""
+        SELECT COUNT(*), COALESCE(SUM(s.total), 0)
+        FROM sales s
+        WHERE s.created_at >= %s::date
+          AND s.created_at < %s::date + interval '1 day'
+          AND s.status = 'cancelled'
+          {branch_clause}
+    """, cancel_params)
+    cancelled = cur.fetchone()
+    cancelled_count = cancelled[0]
+    cancelled_amount = float(cancelled[1])
+
+    # Cash movements for the date
+    mov_params = [target_date, target_date]
+    mov_branch_clause = ""
+    if g.branch_id:
+        mov_branch_clause = "AND cr.branch_id = %s"
+        mov_params.append(g.branch_id)
+
+    cur.execute(f"""
+        SELECT cm.type, COUNT(*), COALESCE(SUM(cm.amount), 0)
+        FROM cash_movements cm
+        JOIN cash_registers cr ON cm.register_id = cr.id
+        WHERE cm.created_at >= %s::date
+          AND cm.created_at < %s::date + interval '1 day'
+          {mov_branch_clause}
+        GROUP BY cm.type
+    """, mov_params)
+    movements = {'in': {'count': 0, 'amount': 0.0}, 'out': {'count': 0, 'amount': 0.0}}
+    for mov_type, count, amount in cur.fetchall():
+        movements[mov_type] = {'count': count, 'amount': float(amount)}
+
+    # Per-register breakdown
+    reg_params = [target_date, target_date]
+    reg_branch_clause = ""
+    if g.branch_id:
+        reg_branch_clause = "AND cr.branch_id = %s"
+        reg_params.append(g.branch_id)
+
+    cur.execute(f"""
+        SELECT cr.id, cr.register_number, cr.status,
+               cr.opening_amount, cr.closing_amount, cr.expected_amount,
+               cr.difference, cr.opened_at, cr.closed_at,
+               e.name as employee_name,
+               (SELECT COUNT(*) FROM sales s WHERE s.register_id = cr.id AND s.status = 'completed') as sale_count,
+               (SELECT COALESCE(SUM(s.total), 0) FROM sales s WHERE s.register_id = cr.id AND s.status = 'completed') as sale_total
+        FROM cash_registers cr
+        LEFT JOIN employees e ON cr.employee_id = e.id
+        WHERE cr.opened_at >= %s::date
+          AND cr.opened_at < %s::date + interval '1 day'
+          {reg_branch_clause}
+        ORDER BY cr.opened_at
+    """, reg_params)
+
+    registers = []
+    for r in cur.fetchall():
+        registers.append({
+            'id': r[0], 'register_number': r[1], 'status': r[2],
+            'opening_amount': float(r[3]) if r[3] else 0,
+            'closing_amount': float(r[4]) if r[4] else 0,
+            'expected_amount': float(r[5]) if r[5] else 0,
+            'difference': float(r[6]) if r[6] else 0,
+            'opened_at': str(r[7]) if r[7] else None,
+            'closed_at': str(r[8]) if r[8] else None,
+            'employee_name': r[9],
+            'sale_count': r[10], 'sale_total': float(r[11]),
+        })
+
+    cur.close(); conn.close()
+
+    return jsonify({
+        'date': target_date,
+        'total_sales': round(total_sales, 2),
+        'total_sales_count': total_sales_count,
+        'sales_by_method': sales_by_method,
+        'cancelled_count': cancelled_count,
+        'cancelled_amount': round(cancelled_amount, 2),
+        'movements_in': movements['in'],
+        'movements_out': movements['out'],
+        'registers': registers,
+    })