diff --git a/src/parser.js b/src/parser.js
index e9225f6..b2d2028 100644
--- a/src/parser.js
+++ b/src/parser.js
@@ -224,15 +224,17 @@ function populateFrontmatter(posts) {
 		});
 
 		// inject custom taxonomy slugs into frontmatter, each taxonomy as its own field
-		Object.entries(post.customTaxonomies).forEach(([domain, slugs]) => {
-			if (slugs.length > 0) {
-				if (Object.hasOwn(post.frontmatter, domain)) {
-					console.warn(`⚠️  Skipping custom taxonomy '${domain}' on post '${post.slug}' because it conflicts with an existing frontmatter field.`);
-					return;
+		if (shared.config.includeCustomTaxonomies) {
+			Object.entries(post.customTaxonomies).forEach(([domain, slugs]) => {
+				if (slugs.length > 0) {
+					if (Object.hasOwn(post.frontmatter, domain)) {
+						console.warn(`⚠️  Skipping custom taxonomy '${domain}' on post '${post.slug}' because it conflicts with an existing frontmatter field.`);
+						return;
+					}
+					post.frontmatter[domain] = slugs;
 				}
-				post.frontmatter[domain] = slugs;
-			}
-		});
+			});
+		}
 	});
 }
 
diff --git a/src/questions.js b/src/questions.js
index e9bec84..1ea6c1c 100644
--- a/src/questions.js
+++ b/src/questions.js
@@ -112,6 +112,40 @@ export function load() {
 			description: 'Frontmatter fields',
 			default: 'title,date,categories,tags,coverImage,draft'
 		},
+		{
+			name: 'include-custom-taxonomies',
+			type: 'boolean',
+			description: 'Include custom taxonomies in post frontmatter',
+			default: true,
+			choices: [
+				{
+					name: 'Yes',
+					value: true
+				},
+				{
+					name: 'No',
+					value: false
+				}
+			],
+			prompt: inquirer.select
+		},
+		{
+			name: 'save-taxonomy-data',
+			type: 'boolean',
+			description: 'Save taxonomy data to JSON files (categories, tags, and custom taxonomies if enabled)',
+			default: true,
+			choices: [
+				{
+					name: 'Yes',
+					value: true
+				},
+				{
+					name: 'No',
+					value: false
+				}
+			],
+			prompt: inquirer.select
+		},
 		{
 			name: 'request-delay',
 			type: 'integer',
diff --git a/src/writer.js b/src/writer.js
index c0fe6ed..3fcd997 100644
--- a/src/writer.js
+++ b/src/writer.js
@@ -10,7 +10,9 @@ import * as shared from './shared.js';
 export async function writeFilesPromise(posts, taxonomies) {
 	await writeMarkdownFilesPromise(posts);
 	await writeImageFilesPromise(posts);
-	await writeTaxonomyFilesPromise(taxonomies);
+	if (shared.config.saveTaxonomyData) {
+		await writeTaxonomyFilesPromise(taxonomies);
+	}
 }
 
 async function processPayloadsPromise(payloads, loadFunc) {
@@ -193,7 +195,14 @@ function logSavingMessage(things, existingCount, remainingCount) {
 async function writeTaxonomyFilesPromise(taxonomies) {
 	shared.logHeading('Saving taxonomy data');
 
-	const entries = Object.entries(taxonomies);
+	const builtInTaxonomies = ['category', 'post_tag'];
+	const filteredTaxonomies = Object.fromEntries(
+		Object.entries(taxonomies).filter(([name]) =>
+			builtInTaxonomies.includes(name) || shared.config.includeCustomTaxonomies
+		)
+	);
+
+	const entries = Object.entries(filteredTaxonomies);
 	if (entries.length === 0) {
 		console.log('No taxonomy data to save.');
 		return;