Tax Season Cybersecurity Checklist for CPA Firms

A practical cybersecurity checklist for CPA and accounting firms to reduce phishing, ransomware, and client data risks during busy season.

Why CPA firms are targeted during tax season

Tax season creates the perfect opportunity for cybercriminals. CPA and accounting firms are busy, deadlines are tight, inboxes are full, and clients are constantly sending sensitive financial documents. Attackers know that one rushed click on a fake email can expose tax records, payroll information, bank details, or client Social Security numbers.

For Raleigh and Wake Forest accounting firms, the goal is not to make security complicated. The goal is to put practical safeguards in place so your team can work efficiently while reducing the risk of phishing, ransomware, and account takeover.

The tax season cybersecurity checklist

1. Require MFA on every important account. Email, tax software, payroll systems, cloud storage, remote access tools, and admin portals should all require multi-factor authentication. Passwords alone are not enough.
2. Lock down email security. CPA firms should use strong spam filtering, phishing protection, malicious attachment scanning, and link protection. Many attacks start with a fake client email, fake IRS notice, or fake document-sharing request.
3. Use secure client document sharing. Avoid sending tax documents, W-2s, returns, and financial statements through regular email attachments when possible. Use secure portals or cloud sharing that requires sign-in and limits access.
4. Review who has access to client files. Not every employee needs access to every folder, mailbox, or client record. Limit access based on role and remove access quickly when employees or contractors leave.
5. Keep workstations patched. Tax software, browsers, PDF tools, operating systems, and office apps should be updated regularly. Attackers often take advantage of outdated software during busy periods.
6. Protect every endpoint with EDR. Traditional antivirus is no longer enough. Endpoint detection and response helps identify suspicious activity, ransomware behavior, and compromised devices before the damage spreads.
7. Back up critical data and test restores. Backups should cover files, cloud data, and important business systems. More importantly, they should be tested so you know your firm can recover if ransomware or accidental deletion hits.
8. Train staff on tax-season scams. Your team should know how to spot fake IRS emails, urgent payment requests, fake DocuSign links, and clients whose email accounts may have been compromised.

Common red flags CPA firms should watch for

During busy season, many attacks look normal at first. A client may appear to send an updated tax document. A vendor may ask for a payment change. An employee may receive a login alert that looks legitimate. These are the moments where a simple verification process can prevent a major incident.

• Unexpected password reset emails
• Clients sending unusual links instead of normal attachments
• Requests to change bank or payroll information
• Emails with urgent language or unusual grammar
• Repeated failed login attempts
• New inbox forwarding rules or mailbox access from unknown locations

Do not wait until after busy season

Many firms plan to “deal with IT later,” but tax season is exactly when attackers increase pressure. The best approach is to fix the highest-risk items first: MFA, email security, endpoint protection, backups, and access controls. Even small improvements can reduce the chance of a costly disruption.

Fast reality check

If you’re a Raleigh or Wake Forest CPA firm, we’ll do a free 20-minute IT and security risk check and show you the top gaps that commonly lead to phishing, ransomware, data exposure, or downtime during tax season.

Looking for managed IT support in Raleigh? Learn more about our Managed IT Services in Raleigh.