diff --git a/Library/Homebrew/dev-cmd/tap-new.rb b/Library/Homebrew/dev-cmd/tap-new.rb
index 7b587570be..12f21e57d8 100644
--- a/Library/Homebrew/dev-cmd/tap-new.rb
+++ b/Library/Homebrew/dev-cmd/tap-new.rb
@@ -17,8 +17,12 @@ module Homebrew
 
       switch "--no-git",
              description: "Don't initialize a git repository for the tap."
-      flag   "--pull-label",
+      flag   "--pull-label=",
              description: "Label name for pull requests ready to be pulled (default `pr-pull`)."
+      flag   "--branch=",
+             description: "Initialize git repository with the specified branch name (default `main`)."
+
+      conflicts "--no-git", "--branch"
       named 1
     end
   end
@@ -27,6 +31,7 @@ module Homebrew
     args = tap_new_args.parse
 
     label = args.pull_label || "pr-pull"
+    branch = args.branch || "main"
 
     tap_name = args.named.first
     tap = Tap.fetch(tap_name)
@@ -56,7 +61,7 @@ module Homebrew
       name: brew test-bot
       on:
         push:
-          branches: master
+          branches: #{branch}
         pull_request:
       jobs:
         test-bot:
@@ -106,7 +111,7 @@ module Homebrew
             - labeled
       jobs:
         pr-pull:
-          if: contains(github.event.pull_request.labels.*.name, #{label})
+          if: contains(github.event.pull_request.labels.*.name, '#{label}')
           runs-on: ubuntu-latest
           steps:
             - name: Set up Homebrew
@@ -115,6 +120,11 @@ module Homebrew
             - name: Set up git
               uses: Homebrew/actions/git-user-config@master
 
+            - name: Checkout default branch
+              env:
+                BRANCH: ${{ github.event.pull_request.head.repo.default_branch }}
+              run: git checkout $BRANCH
+
             - name: Pull bottles
               env:
                 HOMEBREW_GITHUB_API_TOKEN: ${{ github.token }}
@@ -125,6 +135,7 @@ module Homebrew
               uses: Homebrew/actions/git-try-push@master
               with:
                 token: ${{ github.token }}
+                branch: #{branch}
 
             - name: Delete branch
               if: github.event.pull_request.head.repo.fork == false
@@ -142,6 +153,7 @@ module Homebrew
         safe_system "git", "init"
         safe_system "git", "add", "--all"
         safe_system "git", "commit", "-m", "Create #{tap} tap"
+        safe_system "git", "branch", "-m", branch
       end
     end
 
diff --git a/docs/Manpage.md b/docs/Manpage.md
index 3d2d523253..2753f53c5a 100644
--- a/docs/Manpage.md
+++ b/docs/Manpage.md
@@ -1231,6 +1231,8 @@ Generate the template files for a new tap.
   Don't initialize a git repository for the tap.
 * `--pull-label`:
   Label name for pull requests ready to be pulled (default `pr-pull`).
+* `--branch`:
+  Initialize git repository with the specified branch name (default `main`).
 
 ### `test` [*`options`*] *`formula`*
 
diff --git a/manpages/brew.1 b/manpages/brew.1
index 6d57c7068e..9b8b334d5a 100644
--- a/manpages/brew.1
+++ b/manpages/brew.1
@@ -1708,6 +1708,10 @@ Don\'t initialize a git repository for the tap\.
 \fB\-\-pull\-label\fR
 Label name for pull requests ready to be pulled (default \fBpr\-pull\fR)\.
 .
+.TP
+\fB\-\-branch\fR
+Initialize git repository with the specified branch name (default \fBmain\fR)\.
+.
 .SS "\fBtest\fR [\fIoptions\fR] \fIformula\fR"
 Run the test method provided by an installed formula\. There is no standard output or return code, but generally it should notify the user if something is wrong with the installed formula\.
 .