diff --git a/src/State/EmployeeLeaveSummaryProvider.php b/src/State/EmployeeLeaveSummaryProvider.php
index ea92f04..0292a1a 100644
--- a/src/State/EmployeeLeaveSummaryProvider.php
+++ b/src/State/EmployeeLeaveSummaryProvider.php
@@ -786,6 +786,20 @@ final readonly class EmployeeLeaveSummaryProvider implements ProviderInterface
         return $repoDaysYear * $businessDaysPeriod / $businessDaysYear;
     }
 
+    /**
+     * Vrai si la phase FORFAIT démarre en cours de l'année civile consultée
+     * (donc avec une période partielle), faux pour une année pleine ou un démarrage le 1er janvier.
+     */
+    private function isForfaitEntryYear(ContractPhase $phase, int $year): bool
+    {
+        if (ContractType::FORFAIT !== $phase->contractType) {
+            return false;
+        }
+
+        return (int) $phase->startDate->format('Y') === $year
+            && '01-01' !== $phase->startDate->format('m-d');
+    }
+
     /**
      * @param null|array<string, string> $publicHolidays pre-built map (built if null)
      */
diff --git a/tests/State/EmployeeLeaveSummaryProviderTest.php b/tests/State/EmployeeLeaveSummaryProviderTest.php
index 69007ee..8a2347f 100644
--- a/tests/State/EmployeeLeaveSummaryProviderTest.php
+++ b/tests/State/EmployeeLeaveSummaryProviderTest.php
@@ -210,6 +210,43 @@ final class EmployeeLeaveSummaryProviderTest extends TestCase
         self::assertEqualsWithDelta(22.92, $acquired, 0.1);
     }
 
+    public function testIsForfaitEntryYearTrueOnStartYear(): void
+    {
+        $employee     = $this->buildEmployeeWithTransition('2020-06-01', '2026-04-30', '2026-05-01');
+        $forfaitPhase = new EmployeeContractPhaseResolver()->resolvePhases($employee)[0];
+        $provider     = $this->buildProvider();
+
+        self::assertTrue($this->invokePrivate($provider, 'isForfaitEntryYear', $forfaitPhase, 2026));
+    }
+
+    public function testIsForfaitEntryYearFalseOnSubsequentFullYear(): void
+    {
+        $employee     = $this->buildEmployeeWithTransition('2020-06-01', '2026-04-30', '2026-05-01');
+        $forfaitPhase = new EmployeeContractPhaseResolver()->resolvePhases($employee)[0];
+        $provider     = $this->buildProvider();
+
+        self::assertFalse($this->invokePrivate($provider, 'isForfaitEntryYear', $forfaitPhase, 2027));
+    }
+
+    public function testIsForfaitEntryYearFalseWhenForfaitStartsJan1(): void
+    {
+        $employee     = $this->buildEmployeeWithTransition('2020-06-01', '2025-12-31', '2026-01-01');
+        $forfaitPhase = new EmployeeContractPhaseResolver()->resolvePhases($employee)[0];
+        $provider     = $this->buildProvider();
+
+        // Forfait démarrant un 1er janvier = année pleine, pas une entrée en cours d'année.
+        self::assertFalse($this->invokePrivate($provider, 'isForfaitEntryYear', $forfaitPhase, 2026));
+    }
+
+    public function testIsForfaitEntryYearFalseForNonForfaitPhase(): void
+    {
+        $employee = $this->buildEmployeeWithTransition('2020-06-01', '2026-04-30', '2026-05-01');
+        $h39Phase = new EmployeeContractPhaseResolver()->resolvePhases($employee)[1];
+        $provider = $this->buildProvider();
+
+        self::assertFalse($this->invokePrivate($provider, 'isForfaitEntryYear', $h39Phase, 2026));
+    }
+
     public function testNonForfaitPhaseStartingMidExerciseUsesFullExerciseFromAsStart(): void
     {
         // Scenario: 35h CDI from 2014-07-01 to 2025-10-31, then 39h CDI from 2025-11-01.