diff --git a/app/Support/Calendar/Periodicity.php b/app/Support/Calendar/Periodicity.php
index 05825e19a1..75c492bb13 100644
--- a/app/Support/Calendar/Periodicity.php
+++ b/app/Support/Calendar/Periodicity.php
@@ -27,6 +27,7 @@ enum Periodicity
     case Weekly;
     case Fortnightly;
     case Monthly;
+    case Bimonthly;
     case Quarterly;
     case HalfYearly;
     case Yearly;
diff --git a/app/Support/Calendar/Periodicity/Bimonthly.php b/app/Support/Calendar/Periodicity/Bimonthly.php
new file mode 100644
index 0000000000..a8aac196fa
--- /dev/null
+++ b/app/Support/Calendar/Periodicity/Bimonthly.php
@@ -0,0 +1,27 @@
+<?php
+
+/**
+ * Copyright (c) 2023 james@firefly-iii.org
+ *
+ * This file is part of Firefly III (https://github.com/firefly-iii).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace FireflyIII\Support\Calendar\Periodicity;
+
+final class Bimonthly extends Monthly
+{
+    const INTERVAL = 2;
+}
diff --git a/tests/Support/Calendar/CalculatorProvider.php b/tests/Support/Calendar/CalculatorProvider.php
index dcbad2c8d3..20e6172e1e 100644
--- a/tests/Support/Calendar/CalculatorProvider.php
+++ b/tests/Support/Calendar/CalculatorProvider.php
@@ -84,6 +84,17 @@ readonly class CalculatorProvider
             CalculatorProvider::from(Periodicity::Monthly, new IntervalProvider(Carbon::parse('2023-10-30'), Carbon::parse('2024-02-29')), 3),
             CalculatorProvider::from(Periodicity::Monthly, new IntervalProvider(Carbon::parse('2023-10-31'), Carbon::parse('2024-02-29')), 3),
 
+            CalculatorProvider::from(Periodicity::Bimonthly, new IntervalProvider(Carbon::now(), Carbon::now()->addMonthsNoOverflow(6)), 2),
+            CalculatorProvider::from(Periodicity::Bimonthly, new IntervalProvider(Carbon::parse('2019-08-29'), Carbon::parse('2020-02-29')), 2),
+            CalculatorProvider::from(Periodicity::Bimonthly, new IntervalProvider(Carbon::parse('2019-08-30'), Carbon::parse('2020-02-29')), 2),
+            CalculatorProvider::from(Periodicity::Bimonthly, new IntervalProvider(Carbon::parse('2019-08-31'), Carbon::parse('2020-02-29')), 2),
+            CalculatorProvider::from(Periodicity::Bimonthly, new IntervalProvider(Carbon::parse('2019-10-30'), Carbon::parse('2020-02-29')), 1),
+            CalculatorProvider::from(Periodicity::Bimonthly, new IntervalProvider(Carbon::parse('2019-10-31'), Carbon::parse('2020-02-29')), 1),
+            CalculatorProvider::from(Periodicity::Bimonthly, new IntervalProvider(Carbon::parse('2020-02-29'), Carbon::parse('2021-02-28')), 5),
+            CalculatorProvider::from(Periodicity::Bimonthly, new IntervalProvider(Carbon::parse('2020-08-29'), Carbon::parse('2021-02-28')), 2),
+            CalculatorProvider::from(Periodicity::Bimonthly, new IntervalProvider(Carbon::parse('2020-08-30'), Carbon::parse('2021-02-28')), 2),
+            CalculatorProvider::from(Periodicity::Bimonthly, new IntervalProvider(Carbon::parse('2020-08-31'), Carbon::parse('2021-02-28')), 2),
+
             CalculatorProvider::from(Periodicity::Quarterly, new IntervalProvider(Carbon::now(), Carbon::now()->addMonthsNoOverflow(9)), 2),
             CalculatorProvider::from(Periodicity::Quarterly, new IntervalProvider(Carbon::parse('2019-05-29'), Carbon::parse('2020-02-29')), 2),
             CalculatorProvider::from(Periodicity::Quarterly, new IntervalProvider(Carbon::parse('2019-05-30'), Carbon::parse('2020-02-29')), 2),
diff --git a/tests/Support/Calendar/CalculatorTest.php b/tests/Support/Calendar/CalculatorTest.php
index c4fb07c6e8..d3a05fe0cf 100644
--- a/tests/Support/Calendar/CalculatorTest.php
+++ b/tests/Support/Calendar/CalculatorTest.php
@@ -27,6 +27,7 @@ use FireflyIII\Support\Calendar\Calculator;
 use FireflyIII\Support\Calendar\Exceptions\IntervalException;
 use FireflyIII\Support\Calendar\Periodicity;
 use FireflyIII\Support\Navigation;
+use Tests\Support\Calendar\Periodicity\BimonthlyTest;
 use Tests\Support\Calendar\Periodicity\DailyTest;
 use Tests\Support\Calendar\Periodicity\FortnightlyTest;
 use Tests\Support\Calendar\Periodicity\HalfYearlyTest;
@@ -58,6 +59,7 @@ class CalculatorTest extends TestCase
         $intervals = array_merge($intervals, self::convert(Periodicity::Weekly, WeeklyTest::provideIntervals()));
         $intervals = array_merge($intervals, self::convert(Periodicity::Fortnightly, FortnightlyTest::provideIntervals()));
         $intervals = array_merge($intervals, self::convert(Periodicity::Monthly, MonthlyTest::provideIntervals()));
+        $intervals = array_merge($intervals, self::convert(Periodicity::Bimonthly, BimonthlyTest::provideIntervals()));
         $intervals = array_merge($intervals, self::convert(Periodicity::Quarterly, QuarterlyTest::provideIntervals()));
         $intervals = array_merge($intervals, self::convert(Periodicity::HalfYearly, HalfYearlyTest::provideIntervals()));
         $intervals = array_merge($intervals, self::convert(Periodicity::Yearly, YearlyTest::provideIntervals()));
diff --git a/tests/Support/Calendar/Periodicity/BimonthlyTest.php b/tests/Support/Calendar/Periodicity/BimonthlyTest.php
new file mode 100644
index 0000000000..90c46c59b5
--- /dev/null
+++ b/tests/Support/Calendar/Periodicity/BimonthlyTest.php
@@ -0,0 +1,50 @@
+<?php
+
+/**
+ * Copyright (c) 2023 james@firefly-iii.org
+ *
+ * This file is part of Firefly III (https://github.com/firefly-iii).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace Tests\Support\Calendar\Periodicity;
+
+use Carbon\Carbon;
+use FireflyIII\Support\Calendar\Periodicity;
+use FireflyIII\Support\Calendar\Periodicity\Interval;
+
+class BimonthlyTest extends IntervalTestCase
+{
+    public static function factory(): Interval
+    {
+        return new Periodicity\Bimonthly();
+    }
+
+    public static function provideIntervals(): array
+    {
+        return [
+            new IntervalProvider(Carbon::now(), Carbon::now()->addMonths(2)),
+            new IntervalProvider(Carbon::parse('2019-01-29'), Carbon::parse('2019-03-29')),
+            new IntervalProvider(Carbon::parse('2018-12-30'), Carbon::parse('2019-02-28')),
+            new IntervalProvider(Carbon::parse('2018-12-31'), Carbon::parse('2019-02-28')),
+            new IntervalProvider(Carbon::parse('2018-11-01'), Carbon::parse('2019-01-01')),
+            new IntervalProvider(Carbon::parse('2019-11-29'), Carbon::parse('2020-01-29')),
+            new IntervalProvider(Carbon::parse('2019-11-30'), Carbon::parse('2020-01-30')),
+            new IntervalProvider(Carbon::parse('2020-12-29'), Carbon::parse('2021-02-28')),
+            new IntervalProvider(Carbon::parse('2020-12-30'), Carbon::parse('2021-02-28')),
+            new IntervalProvider(Carbon::parse('2020-12-31'), Carbon::parse('2021-02-28')),
+        ];
+    }
+}