diff --git a/create_customer.php b/create_customer.php
new file mode 100644
index 0000000..1e0dc81
--- /dev/null
+++ b/create_customer.php
@@ -0,0 +1,109 @@
+<?php
+require_once 'db/config.php';
+require_once 'templates/header.php';
+
+$name = $email = $phone = $address = $plan_id = "";
+$errors = [];
+
+if ($_SERVER["REQUEST_METHOD"] == "POST") {
+    $name = trim($_POST["name"]);
+    $email = trim($_POST["email"]);
+    $phone = trim($_POST["phone"]);
+    $address = trim($_POST["address"]);
+    $plan_id = trim($_POST["plan_id"]);
+
+    if (empty($name)) {
+        $errors[] = "Name is required.";
+    }
+    if (empty($email)) {
+        $errors[] = "Email is required.";
+    } elseif (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
+        $errors[] = "Invalid email format.";
+    }
+
+    if (empty($errors)) {
+        try {
+            $pdo = db();
+            $sql = "INSERT INTO customers (name, email, phone, address, plan_id, created_at) VALUES (?, ?, ?, ?, ?, NOW())";
+            $stmt = $pdo->prepare($sql);
+            $stmt->execute([$name, $email, $phone, $address, $plan_id]);
+            header("Location: customers.php");
+            exit;
+        } catch (PDOException $e) {
+            $errors[] = "Database error: " . $e->getMessage();
+        }
+    }
+}
+
+// Fetch plans for the dropdown
+try {
+    $pdo = db();
+    $stmt = $pdo->query("SELECT id, name FROM plans");
+    $plans = $stmt->fetchAll(PDO::FETCH_ASSOC);
+} catch (PDOException $e) {
+    $plans = [];
+    $errors[] = "Could not fetch plans.";
+}
+
+?>
+
+<div class="container-fluid px-4">
+    <h1 class="mt-4">Create New Customer</h1>
+    <ol class="breadcrumb mb-4">
+        <li class="breadcrumb-item"><a href="index.php">Dashboard</a></li>
+        <li class="breadcrumb-item"><a href="customers.php">Customers</a></li>
+        <li class="breadcrumb-item active">Create</li>
+    </ol>
+
+    <div class="card mb-4">
+        <div class="card-header">
+            <i class="fas fa-user-plus me-1"></i>
+            New Customer Details
+        </div>
+        <div class="card-body">
+            <?php if (!empty($errors)): ?>
+                <div class="alert alert-danger">
+                    <ul>
+                        <?php foreach ($errors as $error): ?>
+                            <li><?php echo htmlspecialchars($error); ?></li>
+                        <?php endforeach; ?>
+                    </ul>
+                </div>
+            <?php endif; ?>
+
+            <form action="create_customer.php" method="post">
+                <div class="mb-3">
+                    <label for="name" class="form-label">Full Name</label>
+                    <input type="text" class="form-control" id="name" name="name" value="<?php echo htmlspecialchars($name); ?>" required>
+                </div>
+                <div class="mb-3">
+                    <label for="email" class="form-label">Email Address</label>
+                    <input type="email" class="form-control" id="email" name="email" value="<?php echo htmlspecialchars($email); ?>" required>
+                </div>
+                <div class="mb-3">
+                    <label for="phone" class="form-label">Phone</label>
+                    <input type="text" class="form-control" id="phone" name="phone" value="<?php echo htmlspecialchars($phone); ?>">
+                </div>
+                <div class="mb-3">
+                    <label for="address" class="form-label">Address</label>
+                    <textarea class="form-control" id="address" name="address" rows="3"><?php echo htmlspecialchars($address); ?></textarea>
+                </div>
+                <div class="mb-3">
+                    <label for="plan_id" class="form-label">Subscription Plan</label>
+                    <select class="form-select" id="plan_id" name="plan_id">
+                        <option value="">Select a plan</option>
+                        <?php foreach ($plans as $plan): ?>
+                            <option value="<?php echo htmlspecialchars($plan['id']); ?>" <?php echo ($plan_id == $plan['id']) ? 'selected' : ''; ?>>
+                                <?php echo htmlspecialchars($plan['name']); ?>
+                            </option>
+                        <?php endforeach; ?>
+                    </select>
+                </div>
+                <button type="submit" class="btn btn-primary">Create Customer</button>
+                <a href="customers.php" class="btn btn-secondary">Cancel</a>
+            </form>
+        </div>
+    </div>
+</div>
+
+<?php require_once 'templates/footer.php'; ?>
diff --git a/create_invoice.php b/create_invoice.php
new file mode 100644
index 0000000..ed83342
--- /dev/null
+++ b/create_invoice.php
@@ -0,0 +1,122 @@
+<?php
+require_once 'db/config.php';
+require_once 'templates/header.php';
+
+$customer_id = $plan_id = $amount = $status = "";
+$errors = [];
+
+if ($_SERVER["REQUEST_METHOD"] == "POST") {
+    $customer_id = trim($_POST["customer_id"]);
+    $plan_id = trim($_POST["plan_id"]);
+    $amount = trim($_POST["amount"]);
+    $status = trim($_POST["status"]);
+
+    if (empty($customer_id)) {
+        $errors[] = "Customer is required.";
+    }
+    if (empty($plan_id)) {
+        $errors[] = "Plan is required.";
+    }
+    if (empty($amount) || !is_numeric($amount)) {
+        $errors[] = "A valid amount is required.";
+    }
+    if (empty($status)) {
+        $errors[] = "Status is required.";
+    }
+
+    if (empty($errors)) {
+        try {
+            $pdo = db();
+            $sql = "INSERT INTO invoices (customer_id, plan_id, amount, status, created_at) VALUES (?, ?, ?, ?, NOW())";
+            $stmt = $pdo->prepare($sql);
+            $stmt->execute([$customer_id, $plan_id, $amount, $status]);
+            header("Location: invoices.php");
+            exit;
+        } catch (PDOException $e) {
+            $errors[] = "Database error: " . $e->getMessage();
+        }
+    }
+}
+
+// Fetch customers and plans for dropdowns
+try {
+    $pdo = db();
+    $customer_stmt = $pdo->query("SELECT id, name FROM customers ORDER BY name");
+    $customers = $customer_stmt->fetchAll(PDO::FETCH_ASSOC);
+    $plan_stmt = $pdo->query("SELECT id, name FROM plans ORDER BY name");
+    $plans = $plan_stmt->fetchAll(PDO::FETCH_ASSOC);
+} catch (PDOException $e) {
+    $customers = [];
+    $plans = [];
+    $errors[] = "Could not fetch data for form.";
+}
+
+?>
+
+<div class="container-fluid px-4">
+    <h1 class="mt-4">Create New Invoice</h1>
+    <ol class="breadcrumb mb-4">
+        <li class="breadcrumb-item"><a href="index.php">Dashboard</a></li>
+        <li class="breadcrumb-item"><a href="invoices.php">Invoices</a></li>
+        <li class="breadcrumb-item active">Create</li>
+    </ol>
+
+    <div class="card mb-4">
+        <div class="card-header">
+            <i class="fas fa-file-invoice-dollar me-1"></i>
+            New Invoice Details
+        </div>
+        <div class="card-body">
+            <?php if (!empty($errors)): ?>
+                <div class="alert alert-danger">
+                    <ul>
+                        <?php foreach ($errors as $error): ?>
+                            <li><?php echo htmlspecialchars($error); ?></li>
+                        <?php endforeach; ?>
+                    </ul>
+                </div>
+            <?php endif; ?>
+
+            <form action="create_invoice.php" method="post">
+                <div class="mb-3">
+                    <label for="customer_id" class="form-label">Customer</label>
+                    <select class="form-select" id="customer_id" name="customer_id" required>
+                        <option value="">Select a customer</option>
+                        <?php foreach ($customers as $customer): ?>
+                            <option value="<?php echo htmlspecialchars($customer['id']); ?>" <?php echo ($customer_id == $customer['id']) ? 'selected' : ''; ?>>
+                                <?php echo htmlspecialchars($customer['name']); ?>
+                            </option>
+                        <?php endforeach; ?>
+                    </select>
+                </div>
+                <div class="mb-3">
+                    <label for="plan_id" class="form-label">Plan</label>
+                    <select class="form-select" id="plan_id" name="plan_id" required>
+                        <option value="">Select a plan</option>
+                        <?php foreach ($plans as $plan): ?>
+                            <option value="<?php echo htmlspecialchars($plan['id']); ?>" <?php echo ($plan_id == $plan['id']) ? 'selected' : ''; ?>>
+                                <?php echo htmlspecialchars($plan['name']); ?>
+                            </option>
+                        <?php endforeach; ?>
+                    </select>
+                </div>
+                <div class="mb-3">
+                    <label for="amount" class="form-label">Amount ($)</label>
+                    <input type="number" step="0.01" class="form-control" id="amount" name="amount" value="<?php echo htmlspecialchars($amount); ?>" required>
+                </div>
+                <div class="mb-3">
+                    <label for="status" class="form-label">Status</label>
+                    <select class="form-select" id="status" name="status" required>
+                        <option value="paid" <?php echo ($status == 'paid') ? 'selected' : ''; ?>>Paid</option>
+                        <option value="pending" <?php echo ($status == 'pending') ? 'selected' : ''; ?>>Pending</option>
+                        <option value="overdue" <?php echo ($status == 'overdue') ? 'selected' : ''; ?>>Overdue</option>
+                    </select>
+                </div>
+                <button type="submit" class="btn btn-primary">Create Invoice</button>
+                <a href="invoices.php" class="btn btn-secondary">Cancel</a>
+            </form>
+        </div>
+    </div>
+</div>
+
+<?php require_once 'templates/footer.php'; ?>
diff --git a/create_plan.php b/create_plan.php
new file mode 100644
index 0000000..9696d17
--- /dev/null
+++ b/create_plan.php
@@ -0,0 +1,80 @@
+<?php
+require_once 'db/config.php';
+require_once 'templates/header.php';
+
+$name = $price = $features = "";
+$errors = [];
+
+if ($_SERVER["REQUEST_METHOD"] == "POST") {
+    $name = trim($_POST["name"]);
+    $price = trim($_POST["price"]);
+    $features = trim($_POST["features"]);
+
+    if (empty($name)) {
+        $errors[] = "Plan name is required.";
+    }
+    if (empty($price) || !is_numeric($price)) {
+        $errors[] = "A valid price is required.";
+    }
+
+    if (empty($errors)) {
+        try {
+            $pdo = db();
+            $sql = "INSERT INTO plans (name, price, features, created_at) VALUES (?, ?, ?, NOW())";
+            $stmt = $pdo->prepare($sql);
+            $stmt->execute([$name, $price, $features]);
+            header("Location: plans.php");
+            exit;
+        } catch (PDOException $e) {
+            $errors[] = "Database error: " . $e->getMessage();
+        }
+    }
+}
+
+?>
+
+<div class="container-fluid px-4">
+    <h1 class="mt-4">Create New Plan</h1>
+    <ol class="breadcrumb mb-4">
+        <li class="breadcrumb-item"><a href="index.php">Dashboard</a></li>
+        <li class="breadcrumb-item"><a href="plans.php">Plans</a></li>
+        <li class="breadcrumb-item active">Create</li>
+    </ol>
+
+    <div class="card mb-4">
+        <div class="card-header">
+            <i class="fas fa-award me-1"></i>
+            New Plan Details
+        </div>
+        <div class="card-body">
+            <?php if (!empty($errors)): ?>
+                <div class="alert alert-danger">
+                    <ul>
+                        <?php foreach ($errors as $error): ?>
+                            <li><?php echo htmlspecialchars($error); ?></li>
+                        <?php endforeach; ?>
+                    </ul>
+                </div>
+            <?php endif; ?>
+
+            <form action="create_plan.php" method="post">
+                <div class="mb-3">
+                    <label for="name" class="form-label">Plan Name</label>
+                    <input type="text" class="form-control" id="name" name="name" value="<?php echo htmlspecialchars($name); ?>" required>
+                </div>
+                <div class="mb-3">
+                    <label for="price" class="form-label">Price ($ per month)</label>
+                    <input type="number" step="0.01" class="form-control" id="price" name="price" value="<?php echo htmlspecialchars($price); ?>" required>
+                </div>
+                <div class="mb-3">
+                    <label for="features" class="form-label">Features (comma-separated)</label>
+                    <textarea class="form-control" id="features" name="features" rows="3"><?php echo htmlspecialchars($features); ?></textarea>
+                </div>
+                <button type="submit" class="btn btn-primary">Create Plan</button>
+                <a href="plans.php" class="btn btn-secondary">Cancel</a>
+            </form>
+        </div>
+    </div>
+</div>
+
+<?php require_once 'templates/footer.php'; ?>
diff --git a/customers.php b/customers.php
index 00dbd18..2be26da 100644
--- a/customers.php
+++ b/customers.php
@@ -18,10 +18,10 @@ try {
 <div class="d-flex justify-content-between flex-wrap flex-md-nowrap align-items-center pt-3 pb-2 mb-3 border-bottom">
     <h1 class="h2">Customers</h1>
     <div class="btn-toolbar mb-2 mb-md-0">
-        <button type="button" class="btn btn-sm btn-primary">
+        <a href="create_customer.php" class="btn btn-sm btn-primary">
             <i class="bi bi-plus-circle"></i>
             Add New Customer
-        </button>
+        </a>
     </div>
 </div>
 
diff --git a/invoices.php b/invoices.php
index 3e2a25a..0e0da7a 100644
--- a/invoices.php
+++ b/invoices.php
@@ -7,10 +7,10 @@ require_once 'templates/header.php';
 <div class="d-flex justify-content-between flex-wrap flex-md-nowrap align-items-center pt-3 pb-2 mb-3 border-bottom">
     <h1 class="h2">Invoices</h1>
     <div class="btn-toolbar mb-2 mb-md-0">
-        <button type="button" class="btn btn-sm btn-primary">
+        <a href="create_invoice.php" class="btn btn-sm btn-primary">
             <i class="bi bi-plus-circle"></i>
             Create New Invoice
-        </button>
+        </a>
     </div>
 </div>
 
diff --git a/plans.php b/plans.php
index 8b6fec5..a73bc4d 100644
--- a/plans.php
+++ b/plans.php
@@ -10,10 +10,10 @@ $plans = $stmt->fetchAll(PDO::FETCH_ASSOC);
 <div class="d-flex justify-content-between flex-wrap flex-md-nowrap align-items-center pt-3 pb-2 mb-3 border-bottom">
     <h1 class="h2">Subscription Plans</h1>
     <div class="btn-toolbar mb-2 mb-md-0">
-        <button type="button" class="btn btn-sm btn-primary">
+        <a href="create_plan.php" class="btn btn-sm btn-primary">
             <i class="bi bi-plus-circle"></i>
             Add New Plan
-        </button>
+        </a>
     </div>
 </div>