diff --git a/Lib/subprocess.py b/Lib/subprocess.py
index 17333d8c02255d..3cebd7883fcf29 100644
--- a/Lib/subprocess.py
+++ b/Lib/subprocess.py
@@ -2140,7 +2140,7 @@ def _communicate(self, input, endtime, orig_timeout):
 
                 while selector.get_map():
                     timeout = self._remaining_time(endtime)
-                    if timeout is not None and timeout < 0:
+                    if timeout is not None and timeout <= 0:
                         self._check_timeout(endtime, orig_timeout,
                                             stdout, stderr,
                                             skip_check_and_raise=True)
diff --git a/Misc/NEWS.d/next/Library/2025-12-27-00-14-56.gh-issue-142195.UgBEo5.rst b/Misc/NEWS.d/next/Library/2025-12-27-00-14-56.gh-issue-142195.UgBEo5.rst
new file mode 100644
index 00000000000000..6cf7b9df1bc04a
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-12-27-00-14-56.gh-issue-142195.UgBEo5.rst
@@ -0,0 +1 @@
+Updated timeout evaluation logic to be compatible with deterministic environments like Shadow where time moves exactly as requested.