IT & Cybersecurity for Accounting Firms
An accounting practice holds something unusually dangerous: a complete financial identity for every client on its list — names, addresses, Social Security numbers, bank details, the lot — concentrated in one place, on a headcount that rarely justifies dedicated IT staff. Then there is a season when being down for two days is not an inconvenience but a professional emergency. NetSys builds accounting-firm IT around those two facts.
The short answer
NetSys provides managed IT and cybersecurity to accounting and CPA practices: identity hardening with multi-factor authentication and conditional access, email threat protection tuned for refund and invoice fraud and partner impersonation, managed endpoint detection and response, DNS filtering, 24/7 monitoring, immutable backups with restores that are actually tested and timed, secure client-document exchange, and a Written Information Security Plan that reflects what the firm genuinely does rather than a downloaded template. Change windows are scheduled deliberately around filing deadlines — migrations and major work happen in the autumn, not in March. We implement, operate and evidence the controls; interpreting IRS, FTC Safeguards Rule or state obligations and deciding what gets filed remains with your firm and its counsel. Accounting clients engage under confidentiality, so this page carries no named clients and no invented metrics.
Sound familiar?
- A complete financial identity for every client, concentrated in one document store
- A filing season during which downtime is not survivable — and change freezes nobody planned
- Refund, invoice and partner-impersonation fraud arriving by email at exactly the busiest moment
- FTC Safeguards Rule and WISP obligations with nobody whose job it is to own them
- Staff working from home part of the week on machines the firm does not control
- Backups that have never actually been restored, so nobody knows the real recovery time
Protecting Client Financial Data
- Multi-factor authentication and conditional access across every account
- Managed endpoint detection & response on firm devices
- Personal and unmanaged devices fenced away from the document store
- Secure client-document exchange instead of tax returns sent as email attachments
Season-Aware Operations
- Major changes and migrations scheduled outside filing season by design
- Patch windows that do not collide with deadline days
- 24/7 monitoring year-round, with a dedicated account manager on a real cell number
- Readiness reviews run in the autumn, when there is time to act on them
Documentation That Holds Up
- A Written Information Security Plan describing what the firm actually does
- Access reviews that leave an auditable trail
- Incident-response procedure written down before it is needed
- Evidence organised so an insurer or client questionnaire can be answered from records
Recovery You Have Measured
- Immutable offline backups covering practice management and the document store
- Restores actually performed, timed and dated — not merely reported as green
- A written recovery-time objective so 'how long would we be down' has a real answer
- 100% of NetSys clients hit by ransomware have fully recovered
A 45-person accounting firm, eight weeks before filing season
A composite example of work we do, written so you can picture the first 90 days. It is not a specific client — our real, named engagements are in case studies.
Practice-management software, a document store holding a decade of client tax records, and a Microsoft 365 tenant nobody has reviewed since setup. Staff work from home two days a week on a mix of firm laptops and personal machines. The managing partner's worry is not being hacked in the abstract — it is being down for two days in April, and the fact that client financial data sits on devices the firm does not control.
- A readiness review scheduled deliberately outside filing season, with the fix list sequenced so nothing risky lands in March or April
- Microsoft 365 hardened: multi-factor authentication, conditional access separating firm-managed from personal devices, legacy authentication disabled, dormant accounts closed
- Managed endpoint detection and response on firm devices; personal machines fenced off from the document store rather than trusted
- Email defense tuned for the season's real threats — refund and invoice fraud, and impersonation of partners during the busiest weeks
- Immutable backups covering practice management and the document store, with a restore run and timed before the season opens
- A Written Information Security Plan and incident-response procedure documenting what the firm actually does
The firm enters filing season knowing its measured recovery time, with client records reachable only from devices it controls, and monitoring running 24/7 behind the deadline weeks. Nothing structural changes during the season, because it was not left until then.
Accounting & CPA Firms IT FAQs
Do you provide IT support for accounting and CPA firms?
Yes — accounting and CPA practices are one of the two financial audiences we serve, alongside hedge funds and investment advisers. The work covers the full environment where a firm wants one provider: helpdesk, 24/7 monitoring and patching, identity and email security, managed endpoint detection and response, Microsoft 365 administration, secure client-document exchange, and immutable backups with tested restores. Where a firm already has an IT provider it likes, we come in as the security layer alongside them instead.
What does IT support look like during tax season?
Deliberately different from the rest of the year. Migrations and major changes get scheduled outside the crunch. Patching moves to windows that do not collide with filing days. Monitoring runs around the clock either way, and when something does go wrong you reach your dedicated account manager at their real cell number rather than climbing a ticket queue. The planning conversation for all of that happens in the autumn, not in March.
Can you help us produce a WISP for the FTC Safeguards Rule?
We build and document the controls a Written Information Security Plan describes — access control, encryption, multi-factor authentication, endpoint protection, vendor oversight, incident response, and evidence that all of it is genuinely in place — and we keep that documentation in a state that can be handed over rather than reconstructed under pressure. What we will not do is hand you a template describing a firm you are not. Interpreting your obligations and deciding what your firm files stays with the firm and its counsel; what we supply is the control set and the evidence behind it.
How do you stop refund fraud and partner impersonation?
In layers, because no single control does it. Multi-factor authentication and conditional access, so a stolen password is not enough on its own. Email threat protection tuned for lookalike domains and reply-chain hijacking. Alerting on inbox rules that quietly forward or delete mail — a classic precursor. Then the part that is not technology: an out-of-band callback procedure for any change to payment or refund instructions, written down and enforced regardless of who appears to be asking, including on a video call.
Our staff work from home on their own laptops. Is that a problem?
It is the single most common exposure we find in accounting practices, and it is fixable without buying everyone a new machine. Conditional Access can separate firm-managed devices from personal ones, so client financial data is reachable from the former and not the latter, while email and lighter-weight work still function from a personal device. That distinction is usually more valuable, and far cheaper, than a blanket hardware refresh.
Will you name our firm in your marketing?
No. Our accounting and financial clients engage under confidentiality and we honour that in our marketing, not only in our contracts — which is precisely why this page carries no named clients and no engagement metrics. We would rather publish nothing than publish something invented. Where a reference matters, we arrange it privately with a client's consent.
What happens if we get hit by ransomware during filing season?
The outcome is decided before the attack, by whether your backups are immutable and whether anyone has actually restored from them. Every NetSys client hit by ransomware has fully recovered — a 100% record — and that record rests on tested restores rather than luck. We put immutable offline backups in place, run and document a real restore, and write down the recovery-time objective, so the answer to 'how long would we be down in April' is a measured number rather than a hope.
Do you require a long-term contract?
No — every NetSys agreement is month to month. We keep clients by performing rather than by locking them in; retention runs 98%.
Guides for accounting & cpa firms leaders
- AI Automation for Accounting Firms: Where to Start
- Business Email Compromise: How Small Businesses Get Hit
- Cyber Insurance in 2026: What Small Businesses Must Have
- Microsoft 365 Management & Backup
- Free On-Site Penetration Test
- Cybersecurity Assessment
- Security Assessments & Risk Review
- IT & Security for Hedge Funds and Investment Firms
- vCISO Services
Services behind this work
Put fifteen minutes on the calendar.
Tell a NetSys engineer what your environment looks like and where it hurts. You'll get honest answers and a clear next step — no sales pressure, no obligation.