First attempt at including a budget report.

app/Repositories/Shared/ComponentRepository.php

@@ -3,9 +3,11 @@
 namespace FireflyIII\Repositories\Shared;
 
 use Carbon\Carbon;
+use FireflyIII\Models\Account;
 use FireflyIII\Models\TransactionType;
 use FireflyIII\Support\CacheProperties;
 use Illuminate\Database\Query\JoinClause;
+use Illuminate\Support\Collection;
 
 /**
  * Class ComponentRepository
@@ -63,4 +65,46 @@ class ComponentRepository
 
         return $sum;
     }
+
+    /**
+     * @param            $object
+     * @param Carbon     $start
+     * @param Carbon     $end
+     * @param Collection $accounts
+     *
+     * @return string
+     */
+    protected function commonBalanceInPeriodForList($object, Carbon $start, Carbon $end, Collection $accounts)
+    {
+        $cache = new CacheProperties; // we must cache this.
+        $cache->addProperty($object->id);
+        $cache->addProperty(get_class($object));
+        $cache->addProperty($start);
+        $cache->addProperty($end);
+        $cache->addProperty($accounts);
+        $cache->addProperty('balanceInPeriodList');
+
+        $ids = [];
+        /** @var Account $account */
+        foreach ($accounts as $account) {
+            $ids[] = $account->id;
+        }
+
+        if ($cache->has()) {
+            return $cache->get(); // @codeCoverageIgnore
+        }
+
+        $sum = $object->transactionjournals()
+                      ->transactionTypes([TransactionType::WITHDRAWAL, TransactionType::DEPOSIT, TransactionType::OPENING_BALANCE])
+                      ->before($end)
+                      ->leftJoin('transactions', 'transactions.transaction_journal_id', '=', 'transaction_journals.id')
+                      ->leftJoin('accounts', 'accounts.id', '=', 'transactions.account_id')
+                      ->whereIn('accounts.id', $ids)
+                      ->after($start)
+                      ->get(['transaction_journals.*'])->sum('amount');
+
+        $cache->store($sum);
+
+        return $sum;
+    }
 }