diff --git a/packages/publish/src/stages/github-release.ts b/packages/publish/src/stages/github-release.ts
index afe5646a..07e5463d 100644
--- a/packages/publish/src/stages/github-release.ts
+++ b/packages/publish/src/stages/github-release.ts
@@ -189,7 +189,7 @@ function formatChangelogForTag(tag: string, changelogs: VersionPackageChangelog[
   const lines: string[] = [];
   for (const entry of target.entries) {
     const scope = entry.scope ? `**${entry.scope}:** ` : '';
-    lines.push(`- ${scope}${entry.description}`);
+    lines.push(`- ${entry.breaking ? '**BREAKING** ' : ''}${scope}${entry.description}`);
   }
   return lines.join('\n');
 }
diff --git a/packages/publish/test/unit/stages/github-release.spec.ts b/packages/publish/test/unit/stages/github-release.spec.ts
index 0054be24..bf4d2d4a 100644
--- a/packages/publish/test/unit/stages/github-release.spec.ts
+++ b/packages/publish/test/unit/stages/github-release.spec.ts
@@ -272,6 +272,44 @@ describe('github-release stage', () => {
     expect(args).not.toContain('--notes');
   });
 
+  it('should mark a breaking change in a changelog body', async () => {
+    const { execCommand } = await import('../../../src/utils/exec.js');
+    const config = getDefaultConfig();
+    config.githubRelease.body = 'changelog';
+
+    const ctx = createContext({
+      config,
+      input: {
+        dryRun: false,
+        updates: [],
+        changelogs: [
+          {
+            packageName: 'pkg-a',
+            version: '1.0.0',
+            previousVersion: '0.9.0',
+            revisionRange: 'v0.9.0..HEAD',
+            repoUrl: null,
+            entries: [{ type: 'fixed', description: 'Reject the old preset', scope: 'config', breaking: true }],
+          },
+        ],
+        tags: ['pkg-a@v1.0.0'],
+      },
+      output: {
+        dryRun: false,
+        git: { committed: true, tags: ['pkg-a@v1.0.0'], pushed: true },
+        npm: [],
+        cargo: [],
+        verification: [],
+        githubReleases: [],
+      },
+    });
+
+    await runGithubReleaseStage(ctx);
+
+    const args = vi.mocked(execCommand).mock.calls[0]?.[1] as string[];
+    expect(args[args.indexOf('--notes') + 1]).toBe('- **BREAKING** **config:** Reject the old preset');
+  });
+
   it('should match sanitized tag format (scope-pkg-vX.Y.Z) to scoped package name', async () => {
     const { execCommand } = await import('../../../src/utils/exec.js');
 
diff --git a/packages/release/src/preview/format.ts b/packages/release/src/preview/format.ts
index 6f3660ab..09b5e485 100644
--- a/packages/release/src/preview/format.ts
+++ b/packages/release/src/preview/format.ts
@@ -557,7 +557,7 @@ function formatPackageChangelog(changelog: VersionPackageChangelog, refs: Change
 
 function formatEntryGroup(
   type: string,
-  entries: { description: string; scope?: string; issueIds?: string[]; prNumber?: string }[],
+  entries: { description: string; scope?: string; issueIds?: string[]; prNumber?: string; breaking?: boolean }[],
   refs: ChangelogRefsMode,
   repoUrl: string | null,
 ): string[] {
@@ -568,7 +568,10 @@ function formatEntryGroup(
     // Always neutralise `@`-mentions in the description; the scope is already backticked (safe). Bare
     // `#N` refs carried over from the commit subject are neutralised / de-duped against the label.
     const appendedRefs = [...(entry.issueIds ?? []), entry.prNumber];
-    let line = `- ${escapeChangelogMentions(neutralizeDescriptionRefs(entry.description, appendedRefs, refs, repoUrl))}`;
+    const description = escapeChangelogMentions(
+      neutralizeDescriptionRefs(entry.description, appendedRefs, refs, repoUrl),
+    );
+    let line = `- ${entry.breaking ? '**BREAKING** ' : ''}${description}`;
     if (entry.scope) {
       line += ` (\`${entry.scope}\`)`;
     }
diff --git a/packages/release/src/standing-pr/changelog-region.ts b/packages/release/src/standing-pr/changelog-region.ts
index 2c3d027e..0ac06dfa 100644
--- a/packages/release/src/standing-pr/changelog-region.ts
+++ b/packages/release/src/standing-pr/changelog-region.ts
@@ -74,10 +74,11 @@ interface DedupedEntry {
 
 /** Identity of the underlying change: the same commit/PR yields an identical type + description +
  *  scope (+ issue refs) across every package it touched, so this key collapses those N copies into
- *  one. Scope is part of the identity — two commits sharing a description but differing in scope
- *  (`fix(cli)` vs `fix(router)`) are distinct changes and must not merge into a mis-attributed line. */
+ *  one. Scope and the breaking flag are part of the identity — two commits sharing a description but
+ *  differing in scope (`fix(cli)` vs `fix(router)`) are distinct changes and must not merge into a
+ *  mis-attributed line. */
 function dedupeKey(e: VersionChangelogEntry): string {
-  return JSON.stringify([e.type, e.description, e.scope ?? null, e.issueIds ?? []]);
+  return JSON.stringify([e.type, e.description, e.scope ?? null, e.issueIds ?? [], e.breaking === true]);
 }
 
 /** De-duplicate by underlying change, preserving first-seen order and collecting contributing
@@ -129,7 +130,7 @@ function entryLine(d: DedupedEntry, attribution: boolean, refOpts: RefRenderOpti
   const refs = renderIssueRefs(entry.issueIds ?? [], refOpts.refs, refOpts.repoUrl, entry.prNumber);
   const issues = refs ? ` ${refs}` : '';
   const attr = attribution && pkgs.size > 0 ? ` _(${[...pkgs].map(shortName).sort().join(', ')})_` : '';
-  return `- ${description}${scope}${issues}${attr}`;
+  return `- ${entry.breaking ? '**BREAKING** ' : ''}${description}${scope}${issues}${attr}`;
 }
 
 /** Bare heading for the trailing demoted subsection — deliberately no count and no
diff --git a/packages/release/test/unit/changelog-region.spec.ts b/packages/release/test/unit/changelog-region.spec.ts
index a9c8761c..1552471a 100644
--- a/packages/release/test/unit/changelog-region.spec.ts
+++ b/packages/release/test/unit/changelog-region.spec.ts
@@ -85,6 +85,28 @@ describe('changelog-region', () => {
       expect(footer).toContain('_(a, b)_');
     });
 
+    it('should mark a breaking change', () => {
+      const footer = renderCombinedFooter(
+        output({
+          changelogs: [cl('@scope/a', [{ type: 'fix', description: 'Reject the old preset', breaking: true }])],
+        }),
+      );
+      expect(footer).toContain('- **BREAKING** Reject the old preset');
+    });
+
+    it('should keep a breaking change apart from a non-breaking one with the same subject', () => {
+      const footer = renderCombinedFooter(
+        output({
+          changelogs: [
+            cl('@scope/a', [{ type: 'fix', description: 'Reject the old preset' }]),
+            cl('@scope/b', [{ type: 'fix', description: 'Reject the old preset', breaking: true }]),
+          ],
+        }),
+      );
+      expect(footer).toContain('- **BREAKING** Reject the old preset');
+      expect(footer).toContain('Show all changes (2 changes, de-duplicated)');
+    });
+
     it('should keep same-description changes with different scopes as distinct lines', () => {
       const footer = renderCombinedFooter(
         output({
diff --git a/packages/release/test/unit/preview-format.spec.ts b/packages/release/test/unit/preview-format.spec.ts
index 3a59d286..ddae26a6 100644
--- a/packages/release/test/unit/preview-format.spec.ts
+++ b/packages/release/test/unit/preview-format.spec.ts
@@ -215,6 +215,18 @@ describe('formatPreviewComment', () => {
     expect(result).toContain('- Migrate to Vitest');
   });
 
+  it('should mark a breaking change', () => {
+    const output = structuredClone(releaseOutput);
+    const entry = output.versionOutput.changelogs
+      .flatMap((c) => c.entries)
+      .find((e) => e.description === 'New dry-run flag');
+    if (entry) {
+      entry.breaking = true;
+    }
+
+    expect(formatPreviewComment(output)).toContain('- **BREAKING** New dry-run flag (`cli`)');
+  });
+
   it('should render bare #NNN refs per the refs mode', () => {
     expect(formatPreviewComment(releaseOutput, { refs: 'escape' })).toContain(
       '- Fix prerelease sorting (`semver`) (\\#42)',
diff --git a/packages/version/src/changelog/commitParser.ts b/packages/version/src/changelog/commitParser.ts
index da3a3464..7f46dc5b 100644
--- a/packages/version/src/changelog/commitParser.ts
+++ b/packages/version/src/changelog/commitParser.ts
@@ -300,18 +300,13 @@ function parseCommitMessage(message: string): ChangelogEntry | null {
     const bodyIssueIds = extractIssueIds(body);
     const issueIds = prNumber ? [prNumber, ...bodyIssueIds] : bodyIssueIds;
 
-    // Format description, adding BREAKING prefix if needed
-    let description = subjectText;
-    if (hasBreakingChange) {
-      description = `**BREAKING** ${description}`;
-    }
-
     return {
       type: changelogType,
-      description,
+      description: subjectText,
       scope: scope || undefined,
       issueIds: issueIds.length > 0 ? issueIds : undefined,
       prNumber,
+      ...(hasBreakingChange && { breaking: true }),
       originalType: type, // Store original type for custom formatting
     };
   }
diff --git a/packages/version/src/package/packageProcessor.ts b/packages/version/src/package/packageProcessor.ts
index f327ea5d..a4347128 100644
--- a/packages/version/src/package/packageProcessor.ts
+++ b/packages/version/src/package/packageProcessor.ts
@@ -281,7 +281,7 @@ export class PackageProcessor {
         if (repoLevelEntries.length > 0) {
           log(`Found ${repoLevelEntries.length} repo-level commit(s) for ${name}`, 'debug');
           for (const entry of repoLevelEntries) {
-            sharedEntriesMap.set(`${entry.type}:${entry.description}`, entry);
+            sharedEntriesMap.set(`${entry.type}${entry.breaking ? '!' : ''}:${entry.description}`, entry);
           }
         }
 
diff --git a/packages/version/test/unit/changelog/commitParser.spec.ts b/packages/version/test/unit/changelog/commitParser.spec.ts
index 199fc80a..f582298c 100644
--- a/packages/version/test/unit/changelog/commitParser.spec.ts
+++ b/packages/version/test/unit/changelog/commitParser.spec.ts
@@ -70,8 +70,8 @@ describe('Commit Parser', () => {
     const entries = await extractChangelogEntriesFromCommits('/test', RANGE, gitWithLog(mockGitOutput));
 
     expect(entries).toHaveLength(2);
-    expect(entries[0].description).toContain('**BREAKING**');
-    expect(entries[1].description).toContain('**BREAKING**');
+    expect(entries[0]).toMatchObject({ description: 'breaking change', breaking: true });
+    expect(entries[1]).toMatchObject({ description: 'another fix', breaking: true });
   });
 
   it('should extract issue IDs from commit messages', async () => {
diff --git a/packages/version/test/unit/package/packageProcessor.spec.ts b/packages/version/test/unit/package/packageProcessor.spec.ts
index 3f0421af..a005ad51 100644
--- a/packages/version/test/unit/package/packageProcessor.spec.ts
+++ b/packages/version/test/unit/package/packageProcessor.spec.ts
@@ -728,6 +728,18 @@ describe('Package Processor', () => {
       }
     });
 
+    it('should keep a breaking repo-level entry apart from a non-breaking one with the same subject', async () => {
+      const plain = { type: 'fixed', description: 'Reject the old preset' };
+      const breaking = { ...plain, breaking: true };
+      vi.spyOn(commitParser, 'extractChangelogEntriesFromCommits').mockImplementation(() => []);
+      vi.spyOn(commitParser, 'extractRepoLevelChangelogEntries').mockResolvedValue([plain, breaking]);
+
+      const processor = new PackageProcessor({ ...defaultOptions });
+      await processor.processPackages(mockPackages);
+
+      expect(jsonOutput.setSharedEntries).toHaveBeenCalledWith([plain, breaking]);
+    });
+
     it('should track tags via JSON output without creating git tags', async () => {
       const processor = new PackageProcessor(defaultOptions);