diff --git a/.changeset/selfish-worms-remain.md b/.changeset/selfish-worms-remain.md
new file mode 100644
index 0000000000..1a5b06bd7f
--- /dev/null
+++ b/.changeset/selfish-worms-remain.md
@@ -0,0 +1,5 @@
+---
+"hardhat": patch
+---
+
+Moved the calls to shouldMergeCompilationJobs from the task actions to the build system and made its' result the default fallback to use in absence of the mergeCompilationJobs option.
diff --git a/v-next/hardhat/src/internal/builtin-plugins/solidity-test/task-action.ts b/v-next/hardhat/src/internal/builtin-plugins/solidity-test/task-action.ts
index c19c9aaaf9..703eaad72a 100644
--- a/v-next/hardhat/src/internal/builtin-plugins/solidity-test/task-action.ts
+++ b/v-next/hardhat/src/internal/builtin-plugins/solidity-test/task-action.ts
@@ -14,7 +14,6 @@ import { resolveFromRoot } from "@nomicfoundation/hardhat-utils/path";
 import { createNonClosingWriter } from "@nomicfoundation/hardhat-utils/stream";
 import chalk from "chalk";
 
-import { shouldMergeCompilationJobs } from "../solidity/build-profiles.js";
 import {
   getArtifacts,
   getBuildInfos,
@@ -75,9 +74,6 @@ const runSolidityTests: NewTaskActionFunction<TestActionArguments> = async (
   const buildOptions: BuildOptions = {
     force: false,
     buildProfile: hre.globalOptions.buildProfile,
-    mergeCompilationJobs: shouldMergeCompilationJobs(
-      hre.globalOptions.buildProfile,
-    ),
     quiet: true,
   };
 
diff --git a/v-next/hardhat/src/internal/builtin-plugins/solidity/build-system/build-system.ts b/v-next/hardhat/src/internal/builtin-plugins/solidity/build-system/build-system.ts
index 5f4a20b21e..30238c5d24 100644
--- a/v-next/hardhat/src/internal/builtin-plugins/solidity/build-system/build-system.ts
+++ b/v-next/hardhat/src/internal/builtin-plugins/solidity/build-system/build-system.ts
@@ -36,7 +36,10 @@ import debug from "debug";
 import pMap from "p-map";
 
 import { FileBuildResultType } from "../../../../types/solidity/build-system.js";
-import { DEFAULT_BUILD_PROFILE } from "../build-profiles.js";
+import {
+  DEFAULT_BUILD_PROFILE,
+  shouldMergeCompilationJobs,
+} from "../build-profiles.js";
 
 import {
   getArtifactsDeclarationFile,
@@ -334,7 +337,10 @@ export class SolidityBuildSystemImplementation implements SolidityBuildSystem {
       subgraphsWithConfig.push([configOrError, subgraph]);
     }
 
-    if (options?.mergeCompilationJobs === true) {
+    if (
+      options?.mergeCompilationJobs ??
+      shouldMergeCompilationJobs(buildProfileName)
+    ) {
       log(`Merging compilation jobs`);
 
       const mergedSubgraphsByConfig: Map<
diff --git a/v-next/hardhat/src/internal/builtin-plugins/solidity/tasks/compile.ts b/v-next/hardhat/src/internal/builtin-plugins/solidity/tasks/compile.ts
index 8bcb48e439..b7e793ad0e 100644
--- a/v-next/hardhat/src/internal/builtin-plugins/solidity/tasks/compile.ts
+++ b/v-next/hardhat/src/internal/builtin-plugins/solidity/tasks/compile.ts
@@ -2,7 +2,6 @@ import type { NewTaskActionFunction } from "../../../../types/tasks.js";
 
 import { resolveFromRoot } from "@nomicfoundation/hardhat-utils/path";
 
-import { shouldMergeCompilationJobs } from "../build-profiles.js";
 import { throwIfSolidityBuildFailed } from "../build-results.js";
 import { isNpmRootPath } from "../build-system/root-paths-utils.js";
 
@@ -30,9 +29,6 @@ const compileAction: NewTaskActionFunction<CompileActionArguments> = async (
   const results = await solidity.build(rootPaths, {
     force,
     buildProfile: globalOptions.buildProfile,
-    mergeCompilationJobs: shouldMergeCompilationJobs(
-      globalOptions.buildProfile,
-    ),
     quiet,
   });