BIR-CAS Registration: Addressing Frequently Asked Questions


Have you already gathered the requirements needed to register your Computerized Accounting System or CAS? Do you have a checklist of the things you need to apply for it? Are you ready to rumble? If you are a large taxpayer, then going through the tedious process of registering your Computerized Accounting System or CAS as required by the BIR is a must.

If you are still trying to comply and have queries regarding having a BIR CAS-ready accounting software, then we will discuss and address some concerns from Frequently Asked Questions on CAS Registration with the BIR.

This information is all according to REVENUE MEMORANDUM CIRCULAR NO. 5-2021, a memorandum superseding some requirements from the previously followed Revenue Memorandum Circular 9-2009.

Now, here is

Question No. 1: Who needs to go through CAS Registration with the BIR?

According to the Revenue memorandum, all large taxpayers are required. However, for growing SMEs who are thinking big, who are scaling towards growth, and moving on to become big, then you may consider getting a BIR CAS-ready accounting software this early.  

Question No. 2: Do you still need a Permit to Use or PTU-CAS?

This used to be a requirement but has now been amended. If you plan to register now, the requirement of a Permit to Use is no longer a part of the CAS registration anymore. For new applicants, that requirement is no longer a part of the CAS Registration BIR prerequisite. You can now choose an accounting system without a Permit to Use, as RMC No.5-2021 has stated that you can apply using a Permit to Adopt CAS instead. Now with this, you can already scout for BIR CAS-ready accounting software available in the market. It is important to note that not all accounting systems can be in sync with the BIR processes, so yes, look for an online accounting system in the Philippines that is  BIR CAS-ready.

Question No. 3: I have a system that I really like but is not BIR CAS-ready accounting software. What happens if my chosen system is not CAS-Compliant?

This is something that you need to consider. Your BIR- CAS registration may be hindered if the software you have chosen is not a BIR CAS-ready accounting software. This might cause some problems later on in your operation if you make a mistake in choosing non-BIR-ready accounting software. 

Once you have all the requirements ready and you still insist on using that software, you may be penalized. As per RMO No.7-2015, you will be subjected to penalties if the system registered in your business does not comply or meet with the CAS post-evaluation by the Bureau of Internal Revenue (BIR). One thing that you need to do is double-check and request assistance from trusted Certified Public Accountants (CPAs) in the industry which BIR CAS-ready accounting software is recommended and  trusted to pass in the CAS Registration BIR.

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easyFS gives you a highly-accurate and real-time view of your financial statements.

Sign-up for a FREE easyFS Accounting System now!
EasyFIS Logo

easyFS gives you a highly-accurate and real-time view of your financial statements.

Sign-up for a FREE easyFS Accounting System now!

Question No. 4: Is BIR CAS Registration only one time?

The answer is no. And it also depends. If your business is growing and continues to expand, it is possible that the BIR might assess and request additional requirements in the form of modules. This will be added and incorporated into the CAS system. This is clearly mentioned in RMC No.5-2021 6, which shows you that if any financial effects reflected on the system differ from the previous system, the business must re-apply for another CAS Registration. But if the changes are minor, then only a written notice to the BIR RDO Office is needed, mentioning the minor enhancements done on the software. 

Do you still have some questions about BIR-CAS registration? 

If you are an SME and are ready to take the challenge as your business grows, better get a BIR CAS-ready accounting software soonest! Start early so you can easily adjust when you become a large taxpayer as your business grows.

And if you are seriously considering one, there’s EasyFS. EasyFS is a homegrown software from the Philippines. It is  BIR compliant so you can be sure that your Computerized Accounting System follows BIR Regulations and is always Government-Compliant. Here are some EasyFS benefits: 


EasyFS is homegrown BIR CAS-ready accounting software in the Philippines. It currently adapts to the Philippine business practices, particularly the Taxation Regulation and Guidelines of the Bureau of Internal Revenue (BIR). If you use EasyFS, then it will be easy for your business to apply with the BIR for CAS registration.


Since the system Architecture and Design of EasyFS is based on the cloud, and since software updates happen in real-time, you are guaranteed to get the latest version of the accounting software. Plus you will also benefit from the actual experiences of businesses that have benefited from EasyFS.


Migrating to BIR CAS-ready EasyFS Software as a Service (SAAS) application minimizes the need to print stacks of reports and other documents required. Instead, you can download the reports or share documents digitally via the cloud. Your teammates can also view EasyFS data without them altering the records you encoded in the system.


EasyFS has various modules designed for teams in Logistics, Warehouse, Inventory, Sales, and Accounting Teams. Since all of these modules are integrated and interrelated, your teammates can easily coordinate and even collaborate in real time, providing more employee efficiency and saving a lot of time and energy.


BIR CAS-ready EasyFS has been efficiently designed so that the cost of deployment and maintenance is low. And we pass the savings to you by charging you a very reasonable subscription fee.If you are interested in upgrading to BIR-Ready Accounting Software, EasyFS is your answer. It is offering a free demo. Signup now at

EasyFIS Logo

easyFS gives you a highly-accurate and real-time view of your financial statements.

Sign-up for a FREE easyFS Accounting System now!
EasyFIS Logo

easyFS gives you a highly-accurate and real-time view of your financial statements.

Sign-up for a FREE easyFS Accounting System now!

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