diff --git a/src/vies-dotnet-api/Validators/BEVatValidator.cs b/src/vies-dotnet-api/Validators/BEVatValidator.cs
index 14f1dcd..6be17fe 100644
--- a/src/vies-dotnet-api/Validators/BEVatValidator.cs
+++ b/src/vies-dotnet-api/Validators/BEVatValidator.cs
@@ -24,7 +24,7 @@ namespace Padi.Vies.Validators;
 [SuppressMessage("Microsoft.Performance", "CA1812:AvoidUninstantiatedInternalClasses")]
 public sealed class BeVatValidator : VatValidatorAbstract
 {
-    private const string REGEX_PATTERN = @"^0?\d{9}$";
+    private const string REGEX_PATTERN = @"^[0|1]?\d{9}$";
     private const string COUNTRY_CODE = nameof(EuCountryCode.BE);
 
     private static readonly Regex _regex = new(REGEX_PATTERN, RegexOptions.Compiled, TimeSpan.FromSeconds(5));
diff --git a/tests/vies-dotnet-api-test/ViesEUUnitTests.cs b/tests/vies-dotnet-api-test/ViesEUUnitTests.cs
index e806519..3d98468 100644
--- a/tests/vies-dotnet-api-test/ViesEUUnitTests.cs
+++ b/tests/vies-dotnet-api-test/ViesEUUnitTests.cs
@@ -69,10 +69,10 @@ public async Task Should_Throw_ViesValidationException(string vat)
     [InlineData(" BE8972226a80")]
     [InlineData(" BE89722268a0")]
     [InlineData(" BE897222680a")]
-    [InlineData(" BE1602602623")]
-    [InlineData(" BE1400521335")]
-    [InlineData(" BE1400521330")]
-    [InlineData(" BE1400004463")]
+    [InlineData(" BE2602602623")]
+    [InlineData(" BE2400521335")]
+    [InlineData(" BE2400521330")]
+    [InlineData(" BE2400004463")]
     [InlineData(" BE0603601206")]
     [InlineData(" BE603601206")]
     [InlineData(" BE60260262")]
@@ -210,6 +210,10 @@ public void Should_Not_Validate_Vat(string vatNumber)
     [InlineData("   FRAB012345678")]
     [InlineData("PT 980526779")]
     [InlineData(" BE0000200334")]
+    [InlineData("BE1000019421")]
+    [InlineData(" BE1602602623")]
+    [InlineData(" BE1400521335")]
+    [InlineData(" BE1400004463")]
     [InlineData("SK2120046819")]
     [InlineData("LT684289716")]
     [InlineData("LT100003346713")]