diff --git a/docs/reference-guides/core-blocks.md b/docs/reference-guides/core-blocks.md
index 7e031fa525e1ff..0715b1e3547e2a 100644
--- a/docs/reference-guides/core-blocks.md
+++ b/docs/reference-guides/core-blocks.md
@@ -661,7 +661,7 @@ Contains the block elements used to render a post, like the title, date, feature
 -	**Name:** core/post-template
 -	**Category:** theme
 -	**Ancestor:** core/query
--	**Supports:** align (full, wide), color (background, gradients, link, text), interactivity (clientNavigation), layout, spacing (blockGap), typography (fontSize, lineHeight), ~~html~~, ~~reusable~~
+-	**Supports:** align (full, wide), color (background, gradients, link, text), interactivity (clientNavigation), layout, spacing (blockGap, margin, padding), typography (fontSize, lineHeight), ~~html~~, ~~reusable~~
 
 ## Post Terms
 
diff --git a/packages/block-library/src/post-template/block.json b/packages/block-library/src/post-template/block.json
index 6e1f58155590f3..57664b271bca46 100644
--- a/packages/block-library/src/post-template/block.json
+++ b/packages/block-library/src/post-template/block.json
@@ -43,15 +43,25 @@
 			}
 		},
 		"spacing": {
+			"margin": true,
+			"padding": true,
 			"blockGap": {
 				"__experimentalDefault": "1.25em"
 			},
 			"__experimentalDefaultControls": {
-				"blockGap": true
+				"blockGap": true,
+				"padding" : false,
+				"margin" : false
 			}
 		},
 		"interactivity": {
 			"clientNavigation": true
+		},
+		"__experimentalBorder": {
+			"radius": true,
+			"color": true,
+			"width": true,
+			"style": true
 		}
 	},
 	"style": "wp-block-post-template",
diff --git a/packages/block-library/src/post-template/style.scss b/packages/block-library/src/post-template/style.scss
index 806aadc77470eb..e6896f2db024a8 100644
--- a/packages/block-library/src/post-template/style.scss
+++ b/packages/block-library/src/post-template/style.scss
@@ -4,6 +4,8 @@
 	max-width: 100%;
 	list-style: none;
 	padding: 0;
+	// This block has customizable padding, border-box makes that more predictable.
+	box-sizing: border-box;
 
 	// These rules no longer apply but should be kept for backwards compatibility.
 	&.is-flex-container {