diff --git a/packages/sns/lib/sns/AbstractSnsService.ts b/packages/sns/lib/sns/AbstractSnsService.ts
index e6b0d08b..315bd533 100644
--- a/packages/sns/lib/sns/AbstractSnsService.ts
+++ b/packages/sns/lib/sns/AbstractSnsService.ts
@@ -10,7 +10,9 @@ import type { SNS_MESSAGE_BODY_TYPE } from '../types/MessageTypes.ts'
 import { deleteSns, initSns } from '../utils/snsInitter.ts'
 
 // https://docs.aws.amazon.com/general/latest/gr/sns.html
-export const SNS_MESSAGE_MAX_SIZE = 256 * 1024 // 256KB
+export const SNS_MESSAGE_HARD_LIMIT = 256 * 1024 // 256KB - AWS SNS total message size limit (body + attributes)
+export const SNS_MESSAGE_ATTRIBUTE_BUFFER = 30 * 1024 // 30KB - reserved space for message attributes and overhead
+export const SNS_MESSAGE_MAX_SIZE = SNS_MESSAGE_HARD_LIMIT - SNS_MESSAGE_ATTRIBUTE_BUFFER // 226KB - maximum allowed message body size
 
 export type SNSDependencies = QueueDependencies & {
   snsClient: SNSClient
diff --git a/packages/sns/lib/utils/snsUtils.ts b/packages/sns/lib/utils/snsUtils.ts
index 7f541e38..8ad35028 100644
--- a/packages/sns/lib/utils/snsUtils.ts
+++ b/packages/sns/lib/utils/snsUtils.ts
@@ -187,8 +187,8 @@ export async function findSubscriptionByTopicAndQueue(
  * Calculates the size of an outgoing SNS message.
  *
  * SNS imposes a 256 KB limit on the total size of a message, which includes both the message body and any metadata (attributes).
- * This function currently computes the size based solely on the message body, as no attributes are included at this time.
- * For future updates, if message attributes are added, their sizes should also be considered.
+ * This function computes the size based solely on the message body. The reserved buffer for message attributes and overhead
+ * is accounted for in SNS_MESSAGE_ATTRIBUTE_BUFFER, which is subtracted from SNS_MESSAGE_HARD_LIMIT to derive SNS_MESSAGE_MAX_SIZE.
  *
  * Reference: https://docs.aws.amazon.com/sns/latest/dg/sns-message-attributes.html
  *
diff --git a/packages/sqs/lib/sqs/AbstractSqsService.ts b/packages/sqs/lib/sqs/AbstractSqsService.ts
index bb06e59d..54bb59ad 100644
--- a/packages/sqs/lib/sqs/AbstractSqsService.ts
+++ b/packages/sqs/lib/sqs/AbstractSqsService.ts
@@ -9,7 +9,9 @@ import type { SQSMessage } from '../types/MessageTypes.ts'
 import { deleteSqs, initSqs } from '../utils/sqsInitter.ts'
 
 // https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/quotas-messages.html
-export const SQS_MESSAGE_MAX_SIZE = 1024 * 1024 // 1 MiB
+export const SQS_MESSAGE_HARD_LIMIT = 1024 * 1024 // 1 MiB - AWS SQS total message size limit (body + attributes)
+export const SQS_MESSAGE_ATTRIBUTE_BUFFER = 30 * 1024 // 30KB - reserved space for message attributes and overhead
+export const SQS_MESSAGE_MAX_SIZE = SQS_MESSAGE_HARD_LIMIT - SQS_MESSAGE_ATTRIBUTE_BUFFER // 994KB - maximum allowed message body size
 export const SQS_RESOURCE_ANY = Symbol('any')
 export const SQS_RESOURCE_CURRENT_QUEUE = Symbol('current_queue')
 
diff --git a/packages/sqs/lib/utils/sqsUtils.ts b/packages/sqs/lib/utils/sqsUtils.ts
index 3d4ecdaa..83186ae7 100644
--- a/packages/sqs/lib/utils/sqsUtils.ts
+++ b/packages/sqs/lib/utils/sqsUtils.ts
@@ -275,8 +275,8 @@ export async function deleteQueue(
  * Calculates the size of an outgoing SQS message.
  *
  * SQS imposes a 1 MiB limit on the total size of a message, which includes both the message body and any metadata (attributes).
- * This function currently computes the size based solely on the message body, as no attributes are included at this time.
- * For future updates, if message attributes are added, their sizes should also be considered.
+ * This function computes the size based solely on the message body. The reserved buffer for message attributes and overhead
+ * is accounted for in SQS_MESSAGE_ATTRIBUTE_BUFFER, which is subtracted from SQS_MESSAGE_HARD_LIMIT to derive SQS_MESSAGE_MAX_SIZE.
  *
  * Reference: https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-message-metadata.html#sqs-message-attributes
  */