The accounting firms deal with the most sensitive financial data of both individuals and companies like tax returns, Social Security number, bank information, payroll information, financial statements, and much more. An incident of cyber attacks may cause exposure of such information, disruption of business activities, and loss of trust from clients. Thus, adopting cybersecurity best practices for accounting firms becomes a critical step towards securing clients' information and providing reliable accounting services.
In this blog, we will discuss cybersecurity best practices that small and mid-sized CPA firms operating in the USA must consider for the year 2026. Some of these practices include multifactor authentication, data encryption, staff training, and more.
Why Cybersecurity Is Essential for Small and Mid-Sized Accounting Firms
An accounting firm makes an ideal target for any cybercriminal since these institutions store lots of sensitive information about their customers. An average-sized firm can have thousands of accounts from different people and businesses, and getting access to this information is harmful for many parties.
1. Common Cybersecurity Threats Facing CPA Firms
Phishing attacks represent a significant risk to accountants. They may pose themselves as clients, co-workers, financial entities, or tax authorities in order to gain access to login information or to convince employees to give up sensitive information. BEC could result in false payment instructions and/or the alteration of client banking information.
Ransomware attacks, credential thefts, malware attacks, and unauthorized access to cloud applications are also potential threats. During tax season, cybercriminals will use the overload that comes with that season to carry out their operations. It’s important for businesses to set policies to check on any strange request made.
2. Cybersecurity Regulations and Client Data Protection
Accounting firms in the U.S., and those preparing tax documents for clients, have to be aware of the laws and rules related to the information they are working with. The Safeguards Rule of the FTC pertains to any covered financial institution, which includes most professional tax preparation firms, and requires an appropriate information security program.
The IRS, however, stresses the importance of tax professionals having an appropriate WISP (written information security plan). Firms need to understand that merely purchasing cybersecurity software does not ensure compliance with laws and regulations.
3. Cybersecurity Risks in Outsourced Accounting
Outsourcing bookkeeping services, payroll, or tax preparation may also include the granting of access to the client files and accounting system by outsiders. With every new account, every new device, and every document sharing process, there is risk involved unless the access and security processes are managed correctly.
It is important for an accounting firm to assess the access control measures, the confidentiality measures, the document sharing process, and the incident reporting process of the service provider. The access must be controlled to the extent of the data which is needed for that particular engagement, and supervision must be provided.
10 Cybersecurity Best Practices for Accounting Firms
An effective approach to cybersecurity entails both technical and procedural components. Smaller to medium businesses do not necessarily require an extensive IT department within the organization, but there is a requirement for consistency with regard to security protocols.
1. Establish Strong Passwords and Multifactor Authentication
It is essential that accounting firms have unique passwords for business accounts and not allow password sharing. An established password manager will assist employees to create unique passwords and store them for accounting software, emails, cloud storage, and other apps. It is recommended that the password is changed in case of any breach rather than changing periodically for no reason.
Multifactor authentication adds an extra layer of security by adding another step besides password login. Multifactor authentication needs to be enabled on emails, tax software, accounting systems, remote access system, and admin accounts. It is recommended to explore phishing-resistant authentication if available.
2. Keep Software, Devices, and Networks Updated
There might be security risks on old operating systems and applications that could potentially be taken advantage of by hackers. Companies need to keep track of their computers, servers, mobile devices, accounting programs, and browser plugins. Updates should be done right away depending on the level of risk and company needs.
Automatic updates save time for the admin, but companies still need to check if updates were properly installed. Unpatched software needs to be updated or put into a sandbox before being phased out. Firewalls, endpoint security, and network security serve as another form of protection against intrusion.
3. Encrypt Client Data and Use Secure Document Sharing
Encryption can assist in ensuring that the data remains inaccessible without having the necessary decryption key. Accounting firms should adopt the use of encryption for the laptops, external drives, and systems that store the clients' confidential information. The same applies to communication; firms should ensure that the tax returns, payroll, and financial documents are transferred using secure means of communication.
Firms can avoid using email to send the documents as attachments. Instead, they could make use of secure client portals or document-sharing programs. In addition to this, firms should create measures for deleting the documents once they reach their period of retention.
4. Maintain Secure and Regular Data Backups
Backup allows accounting practices to restore from ransomware attacks, accidental deletion, hardware problems, and other such events. Databases for accounting, client documents, tax working papers, and administrative files are some examples of what should be backed up based on their importance to the business.
It is necessary for the backup process to include an undestructible version of the backups to protect the backups from any alterations or deletion by the hacked user account. Offline or appropriately isolated backups could offer better security against ransomware. Testing the backups is essential because the backups are effective only if recovery is possible.
5. Train Employees to Recognize Cyber Threats
Employees face issues such as suspicious emails, malicious links, unexpected attachments, and requests for confidential information. The employees should be made aware of how these attacks occur and what actions need to be taken in the event that they receive such an email.
This training may also include document security, passwords, devices, telecommuting, and reporting the issue. Refresher training sessions and phishing tests may be performed in order to further ensure proper procedure is followed. Employees should know who to contact when they come across a suspicious email.
6. Implement Role-Based Access Controls
All employees do not need to have access to all clients’ files or to the accounting system. Access based on roles gives companies the ability to determine access levels depending on the role of the employee. For instance, a bookkeeping assistant will need access to the transaction details but not to all the client tax papers and not even administrator access.
It is important to monitor access levels constantly, especially in cases where there are changes in the role or departure of the employee. Administrator accounts should not be shared, and privileged access should not be widespread.
7. Develop a Cybersecurity Incident Response Plan
Even those companies that have good security arrangements require a detailed process for handling such incidents. In the process, people who will be responsible for investigation of such a security issue, communication with IT experts, securing of the system, and notifying of the customers must be identified.
The plan must include processes like evidence protection, data recovery, business continuity, and breach notification. Accounting firms must regularly practice their processes using the simulation of incidents to enable employees to handle real security incidents in a more uniform manner.
8. Monitor System Activity and Maintain Audit Trails
Audit trails capture significant events that take place in accounting software as well as other business systems. These will vary depending on the system used but might include login, changes to accounting data, access of documents, and administrative activity. Such an analysis would assist businesses in identifying any irregularities that might indicate possible security breaches.
It is recommended that small and medium-size accounting businesses implement the necessary audit and logging tools and set up procedures for checking the security incidents. They should pay attention to critical systems, privileged accounts, and suspicious access.
9. Secure Remote Work and Physical Devices
The use of remote working provides accounting professionals an opportunity to work with clients from various locations, although it introduces other issues with regard to security. Employers need to ensure that employees use authorized devices and proper security measures for connecting to the confidential data while working remotely.
Security at physical level also needs to be considered. Employees need to make sure that laptops and any other mobile device they use has auto-lock features and disk encryption. Documents with confidential client information need to be properly secured. All such documents need to be destroyed properly.
10. Evaluate Third-Party Vendors and Outsourcing Partners
Accounting firms often rely on tax software vendors, cloud computing firms, payroll service providers, and even accounting services outsourced to external teams. The firm must consider the security protocols of such entities before allowing them access to sensitive data in order to determine if the vendor services are in line with the firm’s needs.
Some considerations for vendor assessment include data handling policies, access restrictions, security certifications, confidentiality agreements in contracts, and incident reporting protocols. It is equally important to have a process in place for terminating access once the vendor service agreement expires.
In order to ensure effective use of cybersecurity measures in accounting firms, it is not enough just to install antivirus programs or make strong passwords. It is vital to have a well-coordinated approach that includes staff awareness, security of technology, controlled access, backing up information, and an incident response process.
Cybersecurity measures should also be updated in case a company is growing, using new accounting systems, or outsourcing its activities. This will help in improving the safety of information about clients and making the company more secure.
The Fino Partners provides outsourced bookkeeping, accounting, payroll, tax preparation support, and financial reporting services for U.S. businesses and CPA firms. When evaluating outsourced accounting services, firms should establish appropriate confidentiality agreements, secure document-sharing procedures, and clearly defined access permissions.
