Works up until actual import.

app/Import/Mapper/Bills.php

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+<?php
+/**
+ * Bills.php
+ * Copyright (C) 2016 thegrumpydictator@gmail.com
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license.  See the LICENSE file for details.
+ */
+
+declare(strict_types = 1);
+
+namespace FireflyIII\Import\Mapper;
+
+use FireflyIII\Models\Bill;
+use FireflyIII\Repositories\Bill\BillRepositoryInterface;
+
+/**
+ * Class Bills
+ *
+ * @package FireflyIII\Import\Mapper
+ */
+class Bills implements MapperInterface
+{
+
+    /**
+     * @return array
+     */
+    public function getMap(): array
+    {
+        /** @var BillRepositoryInterface $repository */
+        $repository = app(BillRepositoryInterface::class);
+        $result     = $repository->getBills();
+        $list       = [];
+
+        /** @var Bill $bill */
+        foreach ($result as $bill) {
+            $list[$bill->id] = $bill->name . ' [' . $bill->match . ']';
+        }
+        asort($list);
+
+        $list = [0 => trans('csv.do_not_map')] + $list;
+
+        return $list;
+
+    }
+}

app/Import/Mapper/Budgets.php

@@ -0,0 +1,47 @@
+<?php
+/**
+ * Budgets.php
+ * Copyright (C) 2016 thegrumpydictator@gmail.com
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license.  See the LICENSE file for details.
+ */
+
+declare(strict_types = 1);
+
+namespace FireflyIII\Import\Mapper;
+
+
+use FireflyIII\Models\Budget;
+use FireflyIII\Repositories\Budget\BudgetRepositoryInterface;
+
+/**
+ * Class Budgets
+ *
+ * @package FireflyIII\Import\Mapper
+ */
+class Budgets implements MapperInterface
+{
+
+    /**
+     * @return array
+     */
+    public function getMap(): array
+    {
+        /** @var BudgetRepositoryInterface $repository */
+        $repository = app(BudgetRepositoryInterface::class);
+        $result     = $repository->getBudgets();
+        $list       = [];
+
+        /** @var Budget $budget */
+        foreach ($result as $budget) {
+            $list[$budget->id] = $budget->name;
+        }
+        asort($list);
+
+        $list = [0 => trans('csv.do_not_map')] + $list;
+
+        return $list;
+
+    }
+}

app/Import/Mapper/Categories.php

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+<?php
+/**
+ * Categories.php
+ * Copyright (C) 2016 thegrumpydictator@gmail.com
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license.  See the LICENSE file for details.
+ */
+
+declare(strict_types = 1);
+
+namespace FireflyIII\Import\Mapper;
+
+
+use FireflyIII\Models\Category;
+use FireflyIII\Repositories\Category\CategoryRepositoryInterface;
+
+/**
+ * Class Categories
+ *
+ * @package FireflyIII\Import\Mapper
+ */
+class Categories implements MapperInterface
+{
+
+    /**
+     * @return array
+     */
+    public function getMap(): array
+    {
+        /** @var CategoryRepositoryInterface $repository */
+        $repository = app(CategoryRepositoryInterface::class);
+        $result     = $repository->getCategories();
+        $list       = [];
+
+        /** @var Category $category */
+        foreach ($result as $category) {
+            $list[$category->id] = $category->name;
+        }
+        asort($list);
+
+        $list = [0 => trans('csv.do_not_map')] + $list;
+
+        return $list;
+
+    }
+}

app/Import/Mapper/Tags.php

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+<?php
+/**
+ * Tags.php
+ * Copyright (C) 2016 thegrumpydictator@gmail.com
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license.  See the LICENSE file for details.
+ */
+
+declare(strict_types = 1);
+
+namespace FireflyIII\Import\Mapper;
+
+use FireflyIII\Models\Tag;
+use FireflyIII\Repositories\Tag\TagRepositoryInterface;
+
+/**
+ * Class Tags
+ *
+ * @package FireflyIII\Import\Mapper
+ */
+class Tags implements MapperInterface
+{
+
+    /**
+     * @return array
+     */
+    public function getMap(): array
+    {
+        /** @var TagRepositoryInterface $repository */
+        $repository = app(TagRepositoryInterface::class);
+        $result     = $repository->get();
+        $list       = [];
+
+        /** @var Tag $tag */
+        foreach ($result as $tag) {
+            $list[$tag->id] = $tag->tag;
+        }
+        asort($list);
+
+        $list = [0 => trans('csv.do_not_map')] + $list;
+
+        return $list;
+
+    }
+}