# Quotas and restrictions
<a name="billing-limits"></a>

You can use the following tables to find the current quotas, restrictions, and naming constraints within the Amazon Billing and Cost Management console.

**Notes**  
To learn more about quotas and restrictions for Amazon Cost Management, see [Quotas and restrictions](https://docs.amazonaws.cn/cost-management/latest/userguide/management-limits.html) in the *Amazon Cost Management User Guide*.
For more information about other Amazon Web Services service quotas, see [Amazon service quotas](https://docs.amazonaws.cn/general/latest/gr/aws_service_limits.html) in the *Amazon Web Services General Reference*.

**Topics**
+ [Cost categories](#limits-categories)
+ [Purchase orders](#limits-po)
+ [Advance Pay](#limits-ap)
+ [Cost allocation tags](#limits-cat)
+ [Amazon Price List](#price-list-api-quotas)
+ [Payment methods](#limits-payments)
+ [Amazon invoice configuration](#limits-invoicing)

## Cost categories
<a name="limits-categories"></a>

See the following quotas and restrictions for cost categories.


| Description | Quotas and restrictions | 
| --- | --- | 
| The total number of cost categories for a management account. | 50 | 
| The number of cost category rules for a cost category (API). | 500 | 
| The number of cost category rules for a cost category (UI). | 100 | 
|   Cost category names.  |  [\[See the AWS documentation website for more details\]](http://docs.amazonaws.cn/en_us/awsaccountbilling/latest/aboutv2/billing-limits.html)  | 
| Cost category value names. | Names don't have to be unique | 
|  The type and number of characters allowed in a cost category name and value name.  |  [\[See the AWS documentation website for more details\]](http://docs.amazonaws.cn/en_us/awsaccountbilling/latest/aboutv2/billing-limits.html)  | 
| The number of split charge rules for a cost category. | 10 | 

## Purchase orders
<a name="limits-po"></a>

See the following quotas and restrictions for purchase orders.


| Description | Quotas and restrictions | 
| --- | --- | 
| The type of characters that you can use in a purchase order ID. |  [\[See the AWS documentation website for more details\]](http://docs.amazonaws.cn/en_us/awsaccountbilling/latest/aboutv2/billing-limits.html)  | 
| The number of characters allowed in a purchase order ID. | 100 | 
| The number of contacts allowed for a purchase order. | 20 | 
| The number of tags allowed for a purchase order. | 50 | 
| The number of line items allowed for a purchase order. | 100 | 

## Advance Pay
<a name="limits-ap"></a>

See the following quotas and restrictions for Advance Pay.


| Description | Quotas and restrictions | 
| --- | --- | 
| User entity  | Amazon Inc. or Amazon Europe | 
| Currency | USD | 
| Fund usage after funds are added to your Advance Pay. |  [\[See the AWS documentation website for more details\]](http://docs.amazonaws.cn/en_us/awsaccountbilling/latest/aboutv2/billing-limits.html)  | 
| If there are unused funds in your Advance Pay. |  [\[See the AWS documentation website for more details\]](http://docs.amazonaws.cn/en_us/awsaccountbilling/latest/aboutv2/billing-limits.html)  | 

## Cost allocation tags
<a name="limits-cat"></a>

**Note**  
Tags that are automatically activated don’t count towards your cost allocation tag quota, such as the `awsApplication` tag. 

See the following quotas and restrictions for cost allocation tags.


| Description | Quotas and restrictions | 
| --- | --- | 
| The maximum number of active cost allocation tag keys for each payer account. | 500 | 
| The number of cost allocation tags that can be activated or deactivated for one request, by using the API or the console. | 20 | 

## Amazon Price List
<a name="price-list-api-quotas"></a>

Some Price List Query API and Price List Bulk API operations are throttled by using a token bucket scheme to maintain service availability. These quotas are per Amazon Web Services account on a per Region basis. The following table shows the quotas for each API operation.


**Price List Query API**  

| API operation | Token bucket size | Refill rate per second | 
| --- | --- | --- | 
| DescribeServices | 10 | 5 | 
| GetAttributeValues | 10 | 5 | 
| GetProducts | 10 | 5 | 


**Price List Bulk API**  

| API operation | Token bucket size | Refill rate per second | 
| --- | --- | --- | 
| DescribeServices | 10 | 5 | 
| GetPriceListFileUrl | 10 | 5 | 
| ListPriceLists | 10 | 5 | 

## Payment methods
<a name="limits-payments"></a>

See the following quotas and restrictions for payments.


| Description | Quotas and restrictions | 
| --- | --- | 
| Tagging payment instruments. | This feature supports the following payment methods: [\[See the AWS documentation website for more details\]](http://docs.amazonaws.cn/en_us/awsaccountbilling/latest/aboutv2/billing-limits.html) This feature doesn't support the following payment methods: [\[See the AWS documentation website for more details\]](http://docs.amazonaws.cn/en_us/awsaccountbilling/latest/aboutv2/billing-limits.html)  | 

## Amazon invoice configuration
<a name="limits-invoicing"></a>

See the following quotas and restrictions for Invoice configuration.


| Description | Quotas and restrictions | 
| --- | --- | 
|  The number of invoice units for a payer account.  | 500 | 
| The type of characters allowed in an invoice unit name. | [\[See the AWS documentation website for more details\]](http://docs.amazonaws.cn/en_us/awsaccountbilling/latest/aboutv2/billing-limits.html) |