How do you keep client financial data secure?
Your clients trust you with their Social Security numbers, bank accounts, income details, and more. One data breach doesn't just cost money-it destroys the trust you've spent years building.
Here's a practical guide to protecting that data.
Why are accounting firms targets?
Hackers go where the valuable data is. Accounting firms are gold mines:
- Social Security numbers
- Bank account information
- Tax returns with complete financial pictures
- Business financial records
Small and mid-size firms are especially vulnerable because they often lack enterprise-level security. Attackers know this.
Essential Security Measures
1. Endpoint Protection
Every computer in your firm should have enterprise-grade security software. Consumer antivirus isn't enough-you need real-time threat detection that can stop ransomware and advanced attacks.
We recommend SentinelOne for accounting firms. It's what large enterprises use, and it's effective against modern threats.
2. Encrypted Backups
Your backups should be: - Automatic – Running daily without manual intervention - Encrypted – Unreadable if intercepted - Offsite – Stored away from your office (cloud or remote location) - Tested – Verified to actually restore properly
3. Secure File Sharing
Stop emailing tax documents. Email is not secure, and attachments can be intercepted.
Use a secure client portal or encrypted file sharing. Your clients will appreciate the professionalism, and you'll sleep better knowing documents aren't floating around email servers.
4. Multi-Factor Authentication (MFA)
Passwords alone aren't enough. Enable MFA on: - Email accounts - Accounting software - Cloud storage - Client portals - Banking and financial sites
Yes, it adds a step. But it blocks the vast majority of account compromises.
5. Staff Training
Your team is your first line of defense-and your biggest vulnerability. Train them to: - Recognize phishing emails - Verify requests for sensitive information - Report suspicious activity immediately - Follow security policies consistently
What should you do if you suspect a breach?
- Don't panic, but act fast. Time matters.
- Disconnect affected systems from the network.
- Contact your IT support immediately.
- Document everything you observe.
- Don't try to fix it yourself unless you're qualified.
Have your IT provider's emergency contact information readily available. Know who to call before you need to call them.
What does IRS Publication 4557 require?
The IRS sets specific expectations for how paid tax preparers handle client data. IRS Publication 4557, Safeguarding Taxpayer Data, is the baseline every firm should know.
The publication requires tax professionals to create a Written Information Security Plan (WISP). That WISP has to cover:
- The sensitive information your firm collects and where it lives
- Who has access to that data, including employees, contractors, and vendors
- The physical, technical, and administrative safeguards protecting it
- How you train staff on those safeguards and their responsibilities
- What your firm does if a breach happens, including IRS and state notification steps
The IRS publishes a WISP template in Publication 5708 to help smaller firms get started. It is intentionally practical, not a document that requires an information security specialist to complete.
What a realistic WISP looks like for a small firm
A workable WISP for a 2-to-15-person firm is usually 10-20 pages and covers the essentials:
- A named security coordinator, usually the owner or office manager
- An inventory of systems that hold client data: tax software, email, file storage, printers, backup service
- Stated controls for each system: encryption, MFA, access review, patching, backup testing
- A written incident response plan, including who to call first
- Annual review and employee acknowledgment
The WISP does not need to be perfect. It needs to be honest, consistent with what your firm actually does, and reviewed each year.
Why this matters beyond compliance
A WISP is more than paperwork. Cyber insurance carriers increasingly require one as a condition of coverage. State attorneys general reference WISPs during breach investigations. And if the IRS audits your data practices, the absence of a WISP becomes a finding.
The firms that treat Publication 4557 as a floor rather than a ceiling tend to avoid the slow-moving compliance problems that surface mid-tax-season.
Need Help Securing Your Firm?
We help Las Vegas accounting firms implement security that actually works-without making your job harder. Endpoint protection, secure backups, and support from people who understand your industry.
Learn about our security services → | Get started with cyber security → | Las Vegas IT services
