diff --git a/doc/functional-rules.md b/doc/functional-rules.md
index ffd0b80..3852532 100644
--- a/doc/functional-rules.md
+++ b/doc/functional-rules.md
@@ -212,12 +212,14 @@ Tous les filtres checkbox sont cochés par défaut à l'ouverture du drawer.
         - en cours d'acquisition jours: `25/12 = 2,08` jours/mois
         - en cours d'acquisition samedis: `5/12 = 0,42` samedi/mois (non detaille en UI)
         - en cas de début/fin en cours de mois, l'acquisition est proratisée au nombre de jours calendaires couverts dans le mois
+        - en cas de suspension en cours de mois, l'acquisition est proratisée en jours ouvrés (lun-ven hors fériés) travaillés / 22 (standard mensuel)
         - samedis acquis affiches: uniquement `opening_saturdays` (report N-1)
       - contrat `4h`:
         - acquis annuel CP: `10`
         - acquis annuel samedi: `0`
         - en cours d'acquisition: `0.83` jour/mois
         - en cas de début/fin en cours de mois, l'acquisition est proratisée au nombre de jours calendaires couverts dans le mois
+        - en cas de suspension en cours de mois, l'acquisition est proratisée en jours ouvrés (lun-ven hors fériés) travaillés / 22
       - contrat `FORFAIT`:
         - base annuelle: `jours ouvrés de l'exercice (lundi-vendredi, hors jours fériés métropole) - 218`
         - prorata: en cas de démarrage/fin de contrat en cours d'année civile, le calcul ne couvre que l'intervalle actif du contrat dans l'année
diff --git a/src/Service/Leave/LeaveBalanceComputationService.php b/src/Service/Leave/LeaveBalanceComputationService.php
index ee0a9cd..b62d745 100644
--- a/src/Service/Leave/LeaveBalanceComputationService.php
+++ b/src/Service/Leave/LeaveBalanceComputationService.php
@@ -278,10 +278,11 @@ final readonly class LeaveBalanceComputationService
             return 0.0;
         }
 
-        $periodStart   = $this->normalizeDate($periodStart);
-        $periodEnd     = $this->normalizeDate($periodEnd);
-        $coveredMonths = 0.0;
-        $cursor        = $periodStart->modify('first day of this month')->setTime(0, 0);
+        $periodStart    = $this->normalizeDate($periodStart);
+        $periodEnd      = $this->normalizeDate($periodEnd);
+        $publicHolidays = [] !== $suspensions ? $this->buildPublicHolidayMap($periodStart, $periodEnd) : [];
+        $coveredMonths  = 0.0;
+        $cursor         = $periodStart->modify('first day of this month')->setTime(0, 0);
         while ($cursor <= $periodEnd) {
             $monthStart = $cursor > $periodStart ? $cursor : $periodStart;
             $monthEnd   = $cursor->modify('last day of this month')->setTime(0, 0);
@@ -289,11 +290,19 @@ final readonly class LeaveBalanceComputationService
                 $monthEnd = $periodEnd;
             }
 
-            $coveredDays = ((int) $monthEnd->diff($monthStart)->format('%a')) + 1;
             if ([] !== $suspensions) {
                 $suspendedDays = $this->suspensionDaysCalculator->countSuspendedDaysInMonth($monthStart, $monthEnd, $suspensions);
-                $coveredDays   = max(0, $coveredDays - $suspendedDays);
+                if ($suspendedDays > 0) {
+                    $businessDays          = $this->countBusinessDaysInRange($monthStart, $monthEnd, $publicHolidays);
+                    $suspendedBusinessDays = $this->suspensionDaysCalculator->countSuspendedBusinessDays($monthStart, $monthEnd, $suspensions, $publicHolidays);
+                    $coveredMonths += max(0, $businessDays - $suspendedBusinessDays) / 22.0;
+                    $cursor = $cursor->modify('first day of next month');
+
+                    continue;
+                }
             }
+
+            $coveredDays = ((int) $monthEnd->diff($monthStart)->format('%a')) + 1;
             $daysInMonth = (int) $cursor->format('t');
             $coveredMonths += $coveredDays / $daysInMonth;
 
@@ -317,8 +326,15 @@ final readonly class LeaveBalanceComputationService
 
     private function countBusinessDays(DateTimeImmutable $from, DateTimeImmutable $to): int
     {
-        $publicHolidays = $this->buildPublicHolidayMap($from, $to);
-        $count          = 0;
+        return $this->countBusinessDaysInRange($from, $to, $this->buildPublicHolidayMap($from, $to));
+    }
+
+    /**
+     * @param array<string, string> $publicHolidays pre-built map
+     */
+    private function countBusinessDaysInRange(DateTimeImmutable $from, DateTimeImmutable $to, array $publicHolidays): int
+    {
+        $count = 0;
         for ($cursor = $from; $cursor <= $to; $cursor = $cursor->modify('+1 day')) {
             $weekDay = (int) $cursor->format('N');
             $dayKey  = $cursor->format('Y-m-d');
diff --git a/src/State/EmployeeLeaveSummaryProvider.php b/src/State/EmployeeLeaveSummaryProvider.php
index fd30908..0816844 100644
--- a/src/State/EmployeeLeaveSummaryProvider.php
+++ b/src/State/EmployeeLeaveSummaryProvider.php
@@ -390,10 +390,11 @@ final readonly class EmployeeLeaveSummaryProvider implements ProviderInterface
             return 0.0;
         }
 
-        $periodStart   = $this->normalizeDate($periodStart);
-        $periodEnd     = $this->normalizeDate($periodEnd);
-        $coveredMonths = 0.0;
-        $cursor        = $periodStart->modify('first day of this month')->setTime(0, 0);
+        $periodStart    = $this->normalizeDate($periodStart);
+        $periodEnd      = $this->normalizeDate($periodEnd);
+        $publicHolidays = [] !== $suspensions ? $this->buildPublicHolidayMap($periodStart, $periodEnd) : [];
+        $coveredMonths  = 0.0;
+        $cursor         = $periodStart->modify('first day of this month')->setTime(0, 0);
         while ($cursor <= $periodEnd) {
             $monthStart = $cursor > $periodStart ? $cursor : $periodStart;
             $monthEnd   = $cursor->modify('last day of this month')->setTime(0, 0);
@@ -401,11 +402,19 @@ final readonly class EmployeeLeaveSummaryProvider implements ProviderInterface
                 $monthEnd = $periodEnd;
             }
 
-            $coveredDays = ((int) $monthEnd->diff($monthStart)->format('%a')) + 1;
             if ([] !== $suspensions) {
                 $suspendedDays = $this->suspensionDaysCalculator->countSuspendedDaysInMonth($monthStart, $monthEnd, $suspensions);
-                $coveredDays   = max(0, $coveredDays - $suspendedDays);
+                if ($suspendedDays > 0) {
+                    $businessDays          = $this->countBusinessDays($monthStart, $monthEnd, $publicHolidays);
+                    $suspendedBusinessDays = $this->suspensionDaysCalculator->countSuspendedBusinessDays($monthStart, $monthEnd, $suspensions, $publicHolidays);
+                    $coveredMonths += max(0, $businessDays - $suspendedBusinessDays) / 22.0;
+                    $cursor = $cursor->modify('first day of next month');
+
+                    continue;
+                }
             }
+
+            $coveredDays = ((int) $monthEnd->diff($monthStart)->format('%a')) + 1;
             $daysInMonth = (int) $cursor->format('t');
             $coveredMonths += $coveredDays / $daysInMonth;
 
@@ -526,10 +535,13 @@ final readonly class EmployeeLeaveSummaryProvider implements ProviderInterface
         ];
     }
 
-    private function countBusinessDays(DateTimeImmutable $from, DateTimeImmutable $to): int
+    /**
+     * @param null|array<string, string> $publicHolidays pre-built map (built if null)
+     */
+    private function countBusinessDays(DateTimeImmutable $from, DateTimeImmutable $to, ?array $publicHolidays = null): int
     {
-        $publicHolidays = $this->buildPublicHolidayMap($from, $to);
-        $count          = 0;
+        $publicHolidays ??= $this->buildPublicHolidayMap($from, $to);
+        $count = 0;
         for ($cursor = $from; $cursor <= $to; $cursor = $cursor->modify('+1 day')) {
             $weekDay = (int) $cursor->format('N');
             $dayKey  = $cursor->format('Y-m-d');