diff --git a/app/Api/V1/Controllers/BillController.php b/app/Api/V1/Controllers/BillController.php
index 2b43bee73c..ca4f727e80 100644
--- a/app/Api/V1/Controllers/BillController.php
+++ b/app/Api/V1/Controllers/BillController.php
@@ -23,9 +23,11 @@ declare(strict_types=1);
 namespace FireflyIII\Api\V1\Controllers;
 
 use Auth;
+use Carbon\Carbon;
 use FireflyIII\Models\Bill;
-use FireflyIII\Transformers\BillTransformer;
+use FireflyIII\Transformers\Bill\BillTransformer;
 use Illuminate\Http\Request;
+use Illuminate\Support\Collection;
 use League\Fractal\Manager;
 use League\Fractal\Pagination\IlluminatePaginatorAdapter;
 use League\Fractal\Resource\Collection as FractalCollection;
@@ -57,17 +59,25 @@ class BillController extends Controller
      */
     public function index(Request $request)
     {
-        $user      = Auth::guard('api')->user();
-        $pageSize  = intval(Preferences::getForUser($user, 'listPageSize', 50)->data);
+        $user     = Auth::guard('api')->user();
+        $pageSize = intval(Preferences::getForUser($user, 'listPageSize', 50)->data);
+        $start    = null;
+        $end      = null;
+        if (null !== $request->get('start')) {
+            $start = new Carbon($request->get('start'));
+        }
+        if (null !== $request->get('end')) {
+            $end = new Carbon($request->get('end'));
+        }
         $paginator = $user->bills()->paginate($pageSize);
-        $bills     = $paginator->getCollection();
+        /** @var Collection $bills */
+        $bills = $paginator->getCollection();
 
         $manager = new Manager();
         $baseUrl = $request->getSchemeAndHttpHost() . '/api/v1';
         $manager->setSerializer(new JsonApiSerializer($baseUrl));
 
-
-        $resource = new FractalCollection($bills, new BillTransformer(), 'bills');
+        $resource = new FractalCollection($bills, new BillTransformer($start, $end), 'bills');
         $resource->setPaginator(new IlluminatePaginatorAdapter($paginator));
 
 
diff --git a/app/Transformers/BillTransformer.php b/app/Transformers/AttachmentTransformer.php
similarity index 51%
rename from app/Transformers/BillTransformer.php
rename to app/Transformers/AttachmentTransformer.php
index e5cf812658..1d6540bdda 100644
--- a/app/Transformers/BillTransformer.php
+++ b/app/Transformers/AttachmentTransformer.php
@@ -1,6 +1,6 @@
 <?php
 /**
- * BillTransformer.php
+ * AttachmentTransformer.php
  * Copyright (c) 2018 thegrumpydictator@gmail.com
  *
  * This file is part of Firefly III.
@@ -23,39 +23,25 @@ declare(strict_types=1);
 
 namespace FireflyIII\Transformers;
 
-use FireflyIII\Models\Bill;
+
+use FireflyIII\Models\Attachment;
 use League\Fractal\TransformerAbstract;
 
 /**
- * Class BillTransformer
+ * Class AttachmentTransformer
  */
-class BillTransformer extends TransformerAbstract
+class AttachmentTransformer extends TransformerAbstract
 {
-
     /**
-     * @param Bill $bill
+     * @param Attachment $attachment
      *
      * @return array
      */
-    public function transform(Bill $bill): array
+    public function transform(Attachment $attachment): array
     {
         return [
-            'id'          => (int)$bill->id,
-            'name'        => $bill->name,
-            'match'       => explode(',', $bill->match),
-            'amount_min'  => round($bill->amount_min, 2),
-            'amount_max'  => round($bill->amount_max, 2),
-            'date'        => $bill->date->format('Y-m-d'),
-            'repeat_freq' => $bill->repeat_freq,
-            'skip'        => (int)$bill->skip,
-            'automatch'   => intval($bill->automatch) === 1,
-            'active'      => intval($bill->active) === 1,
-            'links'       => [
-                [
-                    'rel' => 'self',
-                    'uri' => '/bills/' . $bill->id,
-                ],
-            ],
+            'id' => (int)$attachment->id,
         ];
     }
+
 }
\ No newline at end of file
diff --git a/app/Transformers/Bill/BillTransformer.php b/app/Transformers/Bill/BillTransformer.php
new file mode 100644
index 0000000000..4431912e2f
--- /dev/null
+++ b/app/Transformers/Bill/BillTransformer.php
@@ -0,0 +1,196 @@
+<?php
+/**
+ * BillTransformer.php
+ * Copyright (c) 2018 thegrumpydictator@gmail.com
+ *
+ * This file is part of Firefly III.
+ *
+ * Firefly III 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Firefly III 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 Firefly III. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+declare(strict_types=1);
+
+namespace FireflyIII\Transformers\Bill;
+
+use Carbon\Carbon;
+use FireflyIII\Models\Bill;
+use FireflyIII\Repositories\Bill\BillRepositoryInterface;
+use Illuminate\Support\Collection;
+use League\Fractal\TransformerAbstract;
+
+/**
+ * Class BillTransformer
+ */
+class BillTransformer extends TransformerAbstract
+{
+    /** @var Carbon */
+    private $end = null;
+    /** @var Carbon */
+    private $start = null;
+
+    /**
+     * BillTransformer constructor.
+     *
+     * @param Carbon|null $start
+     * @param Carbon|null $end
+     */
+    public function __construct(Carbon $start = null, Carbon $end = null)
+    {
+        $this->start = $start;
+        $this->end   = $end;
+    }
+
+    /**
+     * @param Bill $bill
+     *
+     * @return array
+     */
+    public function transform(Bill $bill): array
+    {
+        $paidData = $this->paidData($bill);
+        $data     = [
+            'id'                  => (int)$bill->id,
+            'name'                => $bill->name,
+            'match'               => explode(',', $bill->match),
+            'amount_min'          => round($bill->amount_min, 2),
+            'amount_max'          => round($bill->amount_max, 2),
+            'date'                => $bill->date->format('Y-m-d'),
+            'repeat_freq'         => $bill->repeat_freq,
+            'skip'                => (int)$bill->skip,
+            'automatch'           => intval($bill->automatch) === 1,
+            'active'              => intval($bill->active) === 1,
+            'attachments_count'   => $bill->attachments()->count(),
+            'pay_dates'           => $this->payDates($bill),
+            'paid_dates'          => $paidData['paid_dates'],
+            'next_expected_match' => $paidData['next_expected_match'],
+            'links'               => [
+                [
+                    'rel' => 'self',
+                    'uri' => '/bills/' . $bill->id,
+                ],
+            ],
+        ];
+
+
+        return $data;
+
+    }
+
+    /**
+     * Returns the latest date in the set, or start when set is empty.
+     *
+     * @param Collection $dates
+     * @param Carbon     $default
+     *
+     * @return Carbon
+     */
+    protected function lastPaidDate(Collection $dates, Carbon $default): Carbon
+    {
+        if (0 === $dates->count()) {
+            return $default; // @codeCoverageIgnore
+        }
+        $latest = $dates->first();
+        /** @var Carbon $date */
+        foreach ($dates as $date) {
+            if ($date->gte($latest)) {
+                $latest = $date;
+            }
+        }
+
+        return $latest;
+    }
+
+    /**
+     * Given a bill and a date, this method will tell you at which moment this bill expects its next
+     * transaction. Whether or not it is there already, is not relevant.
+     *
+     * @param Bill   $bill
+     * @param Carbon $date
+     *
+     * @return \Carbon\Carbon
+     */
+    protected function nextDateMatch(Bill $bill, Carbon $date): Carbon
+    {
+        $start = clone $bill->date;
+        while ($start < $date) {
+            $start = app('navigation')->addPeriod($start, $bill->repeat_freq, $bill->skip);
+        }
+
+        return $start;
+    }
+
+    /**
+     * @param Bill $bill
+     *
+     * @return array
+     */
+    protected function paidData(Bill $bill): array
+    {
+        /** @var BillRepositoryInterface $repository */
+        $repository = app(BillRepositoryInterface::class);
+        $repository->setUser($bill->user);
+        $set    = $repository->getPaidDatesInRange($bill, $this->start, $this->end);
+        $simple = $set->map(
+            function (Carbon $date) {
+                return $date->format('Y-m-d');
+            }
+        );
+
+        // calculate next expected match:
+        $lastPaidDate = $this->lastPaidDate($set, $this->start);
+        $nextMatch    = clone $bill->date;
+        while ($nextMatch < $lastPaidDate) {
+            $nextMatch = app('navigation')->addPeriod($nextMatch, $bill->repeat_freq, $bill->skip);
+        }
+        $end          = app('navigation')->addPeriod($nextMatch, $bill->repeat_freq, $bill->skip);
+        $journalCount = $repository->getPaidDatesInRange($bill, $nextMatch, $end)->count();
+        if ($journalCount > 0) {
+            $nextMatch = clone $end;
+        }
+
+        return [
+            'paid_dates'          => $simple->toArray(),
+            'next_expected_match' => $nextMatch->format('Y-m-d'),
+        ];
+    }
+
+    /**
+     * @param Bill $bill
+     *
+     * @return array
+     */
+    protected function payDates(Bill $bill): array
+    {
+        $set          = new Collection;
+        $currentStart = clone $this->start;
+        while ($currentStart <= $this->end) {
+            $nextExpectedMatch = $this->nextDateMatch($bill, $currentStart);
+            // If nextExpectedMatch is after end, we continue:
+            if ($nextExpectedMatch > $this->end) {
+                break;
+            }
+            // add to set
+            $set->push(clone $nextExpectedMatch);
+            $nextExpectedMatch->addDay();
+            $currentStart = clone $nextExpectedMatch;
+        }
+        $simple = $set->map(
+            function (Carbon $date) {
+                return $date->format('Y-m-d');
+            }
+        );
+
+        return $simple->toArray();
+    }
+}
\ No newline at end of file