If you are a cloud service provider (CSP) or SaaS company pursuing a Federal government customer, the single most consequential early decision you make is your FedRAMP baseline. Choosing between Low, Moderate, and High determines how many security controls you implement, how long authorization takes, how much your 3PAO assessment costs, and how much continuous monitoring you perform every month for the life of the authorization.
This post explains how baselines are chosen, what actually differs between Moderate and High, and the real cost of picking the wrong one.
What a FedRAMP baseline actually is
A FedRAMP baseline is a tailored subset of NIST SP 800-53 controls that your cloud service must implement and demonstrate. NIST provides a superset of controls; FedRAMP selects and sometimes parameterizes a specific set appropriate to each impact level. The current FedRAMP baseline counts are approximately:
- Low: around 156 controls
- Moderate: around 323 controls
- High: around 410 controls
The jump from Moderate to High is roughly 85–90 additional controls, concentrated in access control, audit/accountability, contingency planning, incident response, and system integrity. These are not minor settings; many require new technology, new processes, or both.
How your impact level is determined: FIPS 199
The impact level is not a marketing decision. It is a formal determination driven by FIPS 199, which classifies information by the worst-case potential impact to the agency across the three legs of the CIA triad:
- Confidentiality. Unauthorized disclosure impact.
- Integrity. Unauthorized modification or destruction impact.
- Availability. Disruption of access or use impact.
Each leg is rated Low, Moderate, or High. The overall categorization is the high-water mark across the three. That means a system with Low confidentiality, Low integrity, and High availability is categorized High — not Low or Moderate.
FedRAMP then maps FIPS 199 categorization to baselines:
- Low confidentiality/integrity/availability → FedRAMP Low
- Moderate in any one leg, with the highest being Moderate → FedRAMP Moderate
- High in any one leg → FedRAMP High
A useful rule of thumb: if your platform supports an agency’s mission in a way that a multi-hour outage would cause significant operational disruption, or if it handles Controlled Unclassified Information (CUI) with meaningful consequence of disclosure, you are likely Moderate at minimum. If your platform handles data whose loss or corruption could cause severe or catastrophic damage — or affects systems critical to life safety, public health, or national security — you are High.
Moderate vs High: where the work actually differs
The control count is a summary, but the operational impact lives in specific areas.
Access control and identity. High requires more aggressive privileged access controls, session lock and termination parameters, device identification and authentication, and access enforcement for information flows. Privileged access workstation patterns become very strongly encouraged.
Audit and accountability. High imposes stricter audit log retention, real-time audit analysis, and protection of audit information. You will typically need a SIEM with near-real-time correlation rules, not just log aggregation.
Contingency planning. Moderate requires alternate storage and processing sites with documented recovery time objectives. High tightens the parameters — shorter RTO/RPO, more frequent DR tests, and geographic separation requirements — and adds alternate telecommunications requirements.
Incident response. High requires more comprehensive and faster response, including automated response mechanisms and coordination with external organizations (often including US-CERT).
System and information integrity. High imposes stricter flaw remediation timelines, more extensive malicious code protection, spam protection, information input validation, and memory protection controls.
Continuous monitoring. Both baselines require monthly scanning and POA&M management. High requires faster remediation timelines for identified vulnerabilities — particularly for high-severity findings — and more detailed reporting.
Personnel security. High commonly drives stricter screening and background checks for personnel with logical or physical access, including US-person requirements for some roles depending on the sponsoring agency.
The cost gap: why High is much more than “a few more controls”
The practical cost delta between Moderate and High is not proportional to the control count; it is closer to 2–3× on several dimensions.
- 3PAO assessment. High assessments are longer and more expensive because more controls are in scope and testing depth increases.
- Engineering effort. The 85–90 additional controls at High typically require real architectural changes — tenant isolation, cryptographic key management, privileged access workstations, additional monitoring infrastructure, stricter network segmentation.
- Operations headcount. Continuous monitoring at High is more labor-intensive. You will feel it in monthly scanning, POA&M velocity, and audit evidence management.
- Time to ATO. High authorizations typically take 12–18+ months from kickoff. Moderate typically takes 9–15 months. Low is faster but rarely the right answer if your buyer is a federal agency at the department level.
The cost of picking the wrong baseline
Picking too high. You burn cash and calendar implementing controls you did not need. You also lose deal velocity — every additional month of authorization is a month your competitor is closing contracts.
Picking too low. This is the worse error. If an agency determines your actual data handling warrants a higher baseline than you were authorized for, you cannot simply “add controls.” You have to re-do the security package at the higher baseline, pass a new 3PAO assessment, and re-receive authorization. Meanwhile you may lose the customer who triggered the issue.
A five-question test to narrow your baseline
- Who is the agency sponsor, and what is the data? Ask for their preliminary FIPS 199 categorization. This is the most authoritative input you can get.
- Will your system process, store, or transmit CUI? If yes, Moderate is the realistic floor. High if the CUI is of particular sensitivity.
- What is the availability SLA the agency expects? If the agency treats downtime as operationally damaging (not just inconvenient), lean toward Moderate-High or High availability.
- Is the data or system tied to life safety, public health, critical infrastructure, or national security? If yes, you are almost certainly High.
- Would a compromise cause reputational or financial damage to the agency at the level of “severe”? If yes, High.
A good rule: get alignment with the sponsoring agency’s ISSO and AO early, in writing, on the target baseline. A baseline decision that lives only in your head will be relitigated at the worst possible time.
Moderate is the most common answer
For most commercial SaaS providers selling to federal agencies, Moderate is the right baseline. It authorizes you for the widest set of typical agency use cases — federal employee productivity systems, secondary/supporting agency systems, most citizen-facing portals that do not handle highly sensitive data. Moderate also maps cleanly to StateRAMP Moderate and to DoD IL2, which helps if you are also pursuing state government or lower-sensitivity defense contracts.
Go High only when the mission or the data genuinely requires it. Sprinting to High when Moderate would have sold the deal is a common and expensive mistake.
How Atlantic Computer Systems helps
We guide CSPs and SaaS providers through FedRAMP Low, Moderate, and High authorizations. Our FedRAMP consulting engagement includes a free readiness assessment, compliance gap analysis, secure cloud architecture review, System Security Plan (SSP) and supporting documentation, control hardening, 3PAO audit support, and ongoing continuous monitoring. We help you pick the right baseline the first time — and get to ATO without wasted quarters.
Request a free FedRAMP readiness assessment →
Related reading
- FedRAMP 3PAO Assessment: What to Expect and How to Prepare
- StateRAMP Moderate vs FedRAMP Moderate: Picking Your Path
- Government IT services
- Cybersecurity services
- Managed IT services
Last updated: April 2026. This post is educational and does not constitute legal or compliance advice. Baselines, control counts, and FedRAMP program details evolve; confirm current requirements at fedramp.gov and with your sponsoring agency.