CPA & Accounting Firm Cybersecurity Colorado

Your accounting firm holds what criminals want most, all in one place — Social Security numbers, bank details, full tax returns and the authority to move money. North Star provides layered cybersecurity, secure cloud IT and hands-on WISP support built for CPA, tax and bookkeeping firms across the Denver metro area, Colorado Springs and Fort Collins, so tax season never turns into a data-breach notification.

This page explains why accounting firms are a prime target, how we secure the tax and accounting systems you actually work in, the layers we place between a threat and your clients’ financial data, and how we help you meet IRS Publication 4557, the Written Information Security Plan (WISP) requirement and the FTC Safeguards Rule. It is part of our broader financial services cybersecurity program.

Book a Security Consultation

Why Accounting Firms Are a Prime Target

Tax and accounting data is the richest single target a criminal can find, and the deadline pressure of filing season is exactly when defenses slip. The damage lands in five ways:

Tax-season wire and refund fraud. Business email compromise puts fraudulent payment or refund instructions into a real exchange with a client — and the money is gone before anyone notices.
Client identity theft. A single return carries SSNs, dependents, dates of birth and bank accounts — everything an attacker needs to file fraudulent returns or open credit in your clients’ names.
Preparer credential and EFIN abuse. A stolen preparer login or Electronic Filing Identification Number lets an attacker file fraudulent returns under your firm’s own identity.
Ransomware during filing deadlines. Files encrypted days before a deadline do not just stop work — they threaten every client filing at once.
IRS and FTC exposure. IRS Publication 4557 and the FTC Safeguards Rule require documented safeguards and breach reporting, and the IRS can suspend e-filing privileges after an incident.

Hands entering a login on a smartphone, representing credential theft and refund fraud risk for accounting firms

Security Built Around Tax Season and the Tools You Use

We secure the way accounting firms actually operate — the tax software, the document portal, the client email and the crunch of deadline season.

Protect the client portal and document exchange

Client documents should never travel as unprotected email attachments. We secure an encrypted, multi-factor-protected exchange so returns, statements and source documents move safely in both directions.

Lock down tax and accounting software

Your preparation, ledger and practice-management systems are governed by identity, multi-factor authentication and device health — whether they run in the cloud or on hosted infrastructure — so a stolen password alone never opens client data.

Serverless where possible

We move firms off the aging back-office server that is both most likely to fail and largest to defend, using the secure foundation behind our Microsoft 365 cloud migration work. Where a hosted tax application still needs a server, we relocate it to Microsoft Azure so the closet and the aging hardware still go away.

Accountant securely accessing cloud-based tax and ledger systems from any location

Defense in Depth: Layers Between a Threat and Client Tax Data

No single control stops everything. We build overlapping layers so that when one is tested, the next one holds — each chosen for a threat accounting firms face:

People and verification. Security-awareness training, phishing simulations and enforced call-back verification before any refund, wire or banking change — the human layer that stops most tax-season fraud.
Email security. Impersonation and display-name protection, external-sender flags and inbound filtering tuned to catch the fraudulent instructions behind business email compromise.
Identity. Phishing-resistant multi-factor authentication and conditional access, so a stolen preparer password alone is never enough to file or reach client data.
Network and access. Zero Trust network access and a secure web gateway, delivered through our SASE and ZTNA solutions, so there is no broad network trust to exploit.
Endpoint protection. Managed detection and response on every device, with encryption and isolation that contains a threat before it spreads.
Backup and recovery. Encrypted, immutable, regularly tested cloud backup so a ransomware demand at deadline becomes a restore, not a payment.
Monitoring and response. Around-the-clock monitoring that detects, halts and investigates — the posture the IRS, FTC and cyber-insurers now expect.

Umbrella over binary code representing layered protection for taxpayer data

IRS Publication 4557, Your WISP, and the FTC Safeguards Rule

For a paid preparer, a written security program is not optional — it is federal law, and you attest to it on your PTIN renewal. We build to the standard and document it so you can prove it:

IRS Publication 4557 (Safeguarding Taxpayer Data). The baseline safeguards the IRS expects from anyone who handles taxpayer information.
The Written Information Security Plan (WISP). Every paid preparer must maintain a written plan. We help you build, implement and keep current a WISP that reflects the controls actually running in your firm — not a template sitting unused in a drawer.
The IRS “Security Six.” Anti-malware and endpoint protection, firewalls, multi-factor authentication, encrypted backups, drive encryption and secure remote access — the core the IRS calls for, and the layers we implement.
FTC Safeguards Rule (GLBA). Tax and accounting firms are “financial institutions” under the rule, which requires a designated qualified individual, risk assessment, access controls, encryption, monitoring and breach notification.
C.R.S. § 6-1-716 & the Colorado Privacy Act. Notify affected Colorado residents within 30 days of determining a breach, and the Attorney General when 500 or more are affected.

Compliance diagram for regulations, standards and audit in a modern accounting office

Serving the Denver Metro Area, Colorado Springs & Fort Collins

North Star provides IT support and cybersecurity for solo CPAs, tax preparers and growing accounting firms across Colorado’s Front Range, including Denver, Aurora, Lakewood, Arvada, Westminster, Thornton, Northglenn, Broomfield, Centennial, Greenwood Village, Englewood, Littleton, Highlands Ranch, Parker, Castle Rock, Golden, Wheat Ridge, Colorado Springs, Monument, Fort Collins, Loveland, Windsor and Greeley, along with the surrounding communities. We also support firms with remote staff and satellite offices elsewhere in the United States.

Frequently Asked Questions

Do all tax preparers really need a WISP?

Yes. Any firm that prepares taxes or handles taxpayer data must maintain a Written Information Security Plan, and you attest to having one when you renew your PTIN. We help you build, implement and document a WISP that reflects the controls actually running in your environment.

What is the IRS “Security Six”?

It is the IRS’s short list of essential protections: anti-malware and endpoint protection, firewalls, multi-factor authentication, encrypted backups, drive encryption and secure remote access. We implement all six and document them as part of your security program.

Isn’t my cloud tax software already secure?

The software secures its own infrastructure, but under the shared-responsibility model your firm still owns identity, access, device security and configuration. Most incidents trace back to those customer-side gaps — which is exactly what our layered protection closes.

What is the biggest cyber risk during tax season?

Business email compromise combined with credential theft. Attackers watch a compromised or spoofed mailbox and insert fraudulent refund or payment instructions, or use a stolen preparer login to file fraudulent returns. Enforced verification, email impersonation protection and phishing-resistant MFA are the layers that stop it.

How does this help my FTC Safeguards and cyber-insurance obligations?

The Safeguards Rule and most insurers require enforced MFA, endpoint detection and response, tested backups and documented controls. We implement those layers and give you the documentation to answer applications and demonstrate compliance accurately — often improving eligibility and premium.

Make Security a Priority

Your technology should be your firm’s strongest safeguard, not its weakest link. North Star can assess your environment against the layers above, show you exactly where the gaps are, help you produce a defensible WISP, and manage it all as part of our financial services cybersecurity program and broader managed security services.