EDR for Small Business: What It Is, What It Costs, and Whether You Need It

The Acronym Most Small Business Owners Can't Quite Define

Walk into any SMB security conversation in 2026 and you'll hear "EDR" used as if everyone knows what it means. Many owners don't. Many IT generalists don't either, not really — they know it's important and that their cyber insurance asks about it, but they couldn't draw the line between EDR and traditional antivirus on a whiteboard.

The acronym stands for Endpoint Detection and Response. The functional difference from traditional antivirus is huge, the price difference is moderate, and the decision of whether you need it (you do) and which one to buy (one of four, depending on size) is one of the more consequential security spends a small business will make in 2026.

This guide walks through what EDR actually is, what the realistic alternatives are, how the four main SMB-grade options compare, and what to budget. It assumes you're an owner, ops lead, or part-time IT manager — not a SOC analyst.

What EDR Actually Does

Traditional antivirus is signature-based: it has a list of known-bad files and patterns, and it blocks anything matching the list. It works well against known threats but fails against anything new — and modern attackers customize malware specifically to dodge signature-based detection.

EDR is behavior-based. Instead of asking "does this file match a known-bad signature?", it asks "is this process doing something that looks like an attack?" Examples:

• A Word document just spawned PowerShell, which is downloading something from an IP address in a country you don't do business with.
• An account that hasn't logged in for 6 months just did, from a new geography, and immediately started enumerating Active Directory.
• A user-mode process just attempted to dump credentials from LSASS.
• A scheduled task was just created that runs at boot and connects to an unfamiliar domain.

Each of these patterns is suspicious regardless of whether the specific file or actor is on a known-bad list. EDR detects the pattern. Good EDR products also act on the pattern automatically (kill the process, isolate the endpoint from the network) before a human analyst is required.

The "response" part of EDR matters as much as the "detection." If your tool sees suspicious behavior at 2am and just emails an alert that nobody reads until 9am, the attacker had seven hours to move laterally. Good EDR isolates the endpoint immediately and forces the operator to consciously un-isolate it after triage.

The Four SMB-Grade EDR Options in 2026

There are dozens of EDR products on the market, but for businesses under 250 employees, four cover ~90% of deployments:

Microsoft Defender for Business ($3/user/month or included in M365 Business Premium at $22/user/month)

The right answer for most M365-centric small businesses. Comes integrated with Defender for Office 365, Defender for Identity, and Defender for Cloud Apps, giving you a unified view across endpoints, email, and identity. Auto-isolation works. Behavior-based detection is competitive. The UI is rough, the alert volume can be noisy without tuning, and the integration story breaks down if you're not all-in on M365 — but if you are, this is the best price/performance option for SMBs.

CrowdStrike Falcon Go (around $5/endpoint/month, 5-100 endpoints)

The SMB-targeted version of the enterprise product. Industry-leading detection, lightweight agent, mature SOC integrations. The "Go" tier is meaningfully cut down from the enterprise tier — no threat intelligence feed, no third-party integrations, no proactive threat hunting — but the detection engine is the same. For businesses that want the best detection and don't need the enterprise feature set, this is the play.

SentinelOne Singularity Core ($4-7/endpoint/month)

The closest direct competitor to CrowdStrike. Behavior-based detection is on par. AI-driven response is a particular strength. Lighter weight integration with M365 than Defender, but stronger detection. The SMB tier is feature-complete in ways CrowdStrike Go isn't — proactive features like rollback are available at the lower price point.

Sophos Intercept X Advanced ($4-6/endpoint/month)

Strong middle-tier. UI is the most approachable for non-security professionals. Good ransomware-specific protection. The behavioral engine is real but the detection ceiling is slightly below CrowdStrike/SentinelOne. Often bundled with the MSP-targeted "Intercept X Essentials" tier for managed environments.

What about staying with traditional antivirus?

Don't. As of 2026, traditional signature-based antivirus alone fails to detect most observed SMB attacks. Cyber insurance carriers know this — many won't quote you without EDR. If you're still on Symantec/Norton/McAfee/AVG without EDR, you have a real risk gap that costs you money in three places: higher cyber insurance premium, higher likelihood of an incident, and worse outcomes if one happens.

MDR vs EDR — The Layer People Get Wrong

EDR is the tool. MDR (Managed Detection and Response) is the human service layer on top of the tool. The tool produces alerts; MDR is a team of SOC analysts who triage those alerts 24/7 and respond to genuine threats on your behalf.

You can buy EDR without MDR (you triage the alerts yourself, which most SMBs can't actually staff for) or EDR with MDR (the SOC handles it). The economics:

• EDR alone: $3-7 per endpoint per month
• EDR + MDR: $15-50 per endpoint per month, depending on coverage hours and SOC sophistication

For SMBs without an internal security team, MDR is usually worth the markup. The math works because alert volume is unpredictable — you might have zero meaningful alerts for three months, then five in one week during an active attack. Paying for 24/7 coverage smooths that out. Most cyber insurance carriers explicitly check for MDR coverage during underwriting.

If your MSP already provides MDR as part of their managed services contract, you're paying for it bundled — fine, just make sure they're actually delivering it. Ask for the runbook for the last 30 days of triage activity. If they don't have one, you're being charged for a service that isn't being delivered.

Realistic Budgets by Company Size

| Size | EDR Alone | EDR + MDR | Notes | |---|---|---|---| | 5-25 endpoints | $15-175/mo | $75-1,250/mo | Defender for Business or CrowdStrike Falcon Go is usually right | | 25-100 endpoints | $75-700/mo | $375-5,000/mo | More vendor flexibility; MSP-bundled MDR usually wins on price | | 100-250 endpoints | $300-1,750/mo | $1,500-12,500/mo | Strong case for dedicated MDR; consider Arctic Wolf, Huntress, ReliaQuest | | 250+ endpoints | $750+/mo | $3,750+/mo | Approaching dedicated security hire or full MSSP relationship |

The "alone" numbers are achievable if you have an IT person who can actually triage alerts. For most SMBs without dedicated security staff, the MDR-bundled cost is the realistic number.

Common Mistakes Small Businesses Make Buying EDR

1. Underestimating tuning effort. Out-of-the-box, every EDR product is noisy. The first 30-60 days require alert tuning to suppress false positives without losing real ones. If you don't budget for tuning effort (either internal time or an MSP doing it), the alert volume becomes overwhelming and gets ignored — which defeats the purpose.

2. Not deploying to all endpoints. EDR on 9 of 10 laptops + 4 of 5 servers leaves the 10th laptop and 5th server unmonitored. Attackers find those gaps. Cyber insurance will deny claims that originate from the unprotected device.

3. Buying EDR without MDR. If your IT person doesn't have time to triage alerts at 2am on Saturday — and most SMB IT people don't — paying for EDR alone is paying for a smoke alarm with the speaker turned off.

4. Skipping the trial. All four products offer free trials. Run one. See what the alert volume looks like in your environment. Test the auto-isolation feature on a test endpoint. The right EDR for you is the one your team can actually operate.

5. Letting the MSP pick without explanation. Many MSPs sell whichever EDR they have the best margin on. Ask why. The honest answer ("we partner with X because of their MSP enablement program") is fine. A non-answer is a flag.

How EDR Fits Into the Broader Stack

EDR is necessary but not sufficient. The complete stack for a 25-100 employee SMB looks roughly like:

• EDR on every endpoint with MDR coverage
• Email security (M365 Defender for Office 365, Proofpoint, or Avanan) with anti-impersonation
• Identity hygiene — MFA enforced everywhere, conditional access policies, legacy auth disabled
• DMARC at p=reject — see our DMARC setup guide
• Immutable backups — tested quarterly, off-network
• Patch management — OS + high-risk apps within 30 days
• Security awareness training — quarterly phishing simulations
• Cyber insurance — see our cyber insurance buyer's guide

EDR sits at the endpoint layer. Email security catches phishing before it lands. Identity hygiene stops credential reuse. DMARC stops spoofing. Backups make you recoverable. Training catches what tools miss. Insurance bails you out when something gets through. No single layer is sufficient; the goal is to make each attack path require defeating multiple controls.

What to Do This Week

1. Run the Breach Horizon Exposure Report on your domain. The Email Auth and TLS findings tell you what attackers see externally — same signal that cyber insurance carriers use.

2. Inventory your endpoint protection. What's actually deployed on every laptop and server? Is anything still on traditional antivirus only? Is MDR actually being delivered or just listed on a contract?

3. Get a quote. All four major EDR vendors will quote SMBs directly. Get the numbers, then go to your MSP and ask whether they can match or beat with bundled MDR.

4. Read your cyber insurance EDR clause. Specifically the language about what's required vs. what's "recommended." Many policies make EDR effectively required by tying it to claim adjudication terms.

Final Word

EDR isn't a magic shield. It's the layer that catches what email security and identity hygiene miss, and the layer that gives an incident response firm something to work with after a breach. For a small business in 2026, it's table stakes — the question isn't whether to deploy EDR, it's which one and at what coverage level.

If you're shopping today, start with Defender for Business if you're M365-heavy, CrowdStrike Falcon Go if you want best-in-class detection, SentinelOne if you want the strongest mid-tier feature set, or Sophos if you want the easiest UI. Combine with MDR through your MSP or a dedicated provider (Huntress, Arctic Wolf, and Field Effect are popular SMB-grade options). Budget realistically — $5-25 per endpoint per month all-in is the going rate — and validate the deployment is actually complete, not "mostly done."

And run the Exposure Report first. The external signals it surfaces — DMARC posture, TLS health, security headers — are signals cyber insurance carriers and well-funded attackers already see. Closing those before you spend on EDR is the cheaper end of the same conversation.