diff --git a/TaxBaik.Web/Program.cs b/TaxBaik.Web/Program.cs
index 4239eb5..d73cece 100644
--- a/TaxBaik.Web/Program.cs
+++ b/TaxBaik.Web/Program.cs
@@ -17,6 +17,12 @@ using TaxBaik.Web.Services;
 var builder = WebApplication.CreateBuilder(args);
 var isProduction = builder.Environment.IsProduction();
 
+// HTTP 요청 헤더/쿠키 크기 제한 증가 (400 Bad Request 해결)
+builder.WebHost.ConfigureKestrel(options =>
+{
+    options.Limits.MaxRequestBodySize = 100 * 1024 * 1024; // 100MB
+});
+
 // Serilog 설정
 builder.Host.UseSerilog((context, config) =>
 {