diff --git a/cmake/QtPublicGitHelpers.cmake b/cmake/QtPublicGitHelpers.cmake
index 2326454a15f..ac50a22d97b 100644
--- a/cmake/QtPublicGitHelpers.cmake
+++ b/cmake/QtPublicGitHelpers.cmake
@@ -49,6 +49,16 @@ function(_qt_internal_query_git_version)
         set(git_version "${version_git_head}+${version_git_branch}")
     endif()
 
+    if(QT_SBOM_FAKE_GIT_VERSION)
+        set(version_git_head "fakegithead")
+        set(version_git_hash "fakegithash")
+        set(version_git_branch "fakegitbranch")
+        set(version_git_tag "fakegittag")
+        set(git_version "${version_git_head}+${version_git_branch}")
+        _qt_internal_set_git_query_variables()
+        return()
+    endif()
+
     if(NOT Git_FOUND)
         message(STATUS "Git not found, skipping querying git version.")
         _qt_internal_set_git_query_variables()
diff --git a/cmake/QtPublicSbomGenerationHelpers.cmake b/cmake/QtPublicSbomGenerationHelpers.cmake
index 4443917f546..6f3e4bccd67 100644
--- a/cmake/QtPublicSbomGenerationHelpers.cmake
+++ b/cmake/QtPublicSbomGenerationHelpers.cmake
@@ -73,8 +73,13 @@ function(_qt_internal_sbom_begin_project_generate)
     cmake_parse_arguments(PARSE_ARGV 0 arg "${opt_args}" "${single_args}" "${multi_args}")
     _qt_internal_validate_all_args_are_parsed(arg)
 
-    string(TIMESTAMP current_utc UTC)
-    string(TIMESTAMP current_year "%Y" UTC)
+    if(QT_SBOM_FAKE_TIMESTAMP)
+        set(current_utc "2590-01-01T11:33:55Z")
+        set(current_year "2590")
+    else()
+        string(TIMESTAMP current_utc UTC)
+        string(TIMESTAMP current_year "%Y" UTC)
+    endif()
 
     _qt_internal_sbom_set_default_option_value(PROJECT "${PROJECT_NAME}")
 
@@ -438,7 +443,7 @@ function(_qt_internal_sbom_end_project_generate)
 
     # Allow skipping checksum computation for testing purposes, while installing just the sbom
     # documents, without requiring to build and install all the actual files.
-    if(QT_INTERNAL_SBOM_FAKE_CHECKSUM)
+    if(QT_SBOM_FAKE_CHECKSUM)
         string(APPEND extra_code_begin "
             set(QT_SBOM_FAKE_CHECKSUM TRUE)")
     endif()
diff --git a/cmake/QtPublicSbomHelpers.cmake b/cmake/QtPublicSbomHelpers.cmake
index 73089e1b93c..236b6736084 100644
--- a/cmake/QtPublicSbomHelpers.cmake
+++ b/cmake/QtPublicSbomHelpers.cmake
@@ -25,6 +25,8 @@ function(_qt_internal_sbom_begin_project)
         return()
     endif()
 
+    _qt_internal_sbom_setup_fake_deterministic_build()
+
     set(opt_args
         QT_CPE
     )
@@ -455,6 +457,25 @@ function(_qt_internal_sbom_end_qt_repo_project)
     _qt_internal_sbom_end_project()
 endfunction()
 
+
+# Enables a fake deterministic SBOM build, for easier inter-diffs between sbom files. Useful
+# for local development.
+function(_qt_internal_sbom_setup_fake_deterministic_build)
+    if(NOT DEFINED QT_SBOM_FAKE_DETERMINISTIC_BUILD)
+        return()
+    endif()
+
+    if(QT_SBOM_FAKE_DETERMINISTIC_BUILD)
+        set(value "ON")
+    elseif()
+        set(value "OFF")
+    endif()
+
+    set(QT_SBOM_FAKE_GIT_VERSION "${value}" CACHE BOOL "SBOM fake git version")
+    set(QT_SBOM_FAKE_TIMESTAMP "${value}" CACHE BOOL "SBOM fake timestamp")
+    set(QT_SBOM_FAKE_CHECKSUM "${value}" CACHE BOOL "SBOM fake checksums")
+endfunction()
+
 # Helper to get purl parsing options.
 macro(_qt_internal_get_sbom_purl_parsing_options opt_args single_args multi_args)
     set(${opt_args}