Include implementation, integration, device support, regression testing, spec updates, and ongoing maintenance. Cost models that stop at the first deployment miss the work needed to keep the authentication path reliable over time. For passkeys, the question is not only what it takes to go live, but what it takes to remain current.
What belongs in a realistic passkey cost model?
The total cost of passkeys is broader than licence fees or the first rollout. Organisations need to budget for integration with existing sign-in flows, support for a mixed device estate, user enrolment and recovery paths, QA and regression work, standards changes, and the operational effort to keep authentication reliable as browsers, platforms, and policies evolve.
That means the real question is not just “can we deploy passkeys?”, but “what will it take to operate them safely and consistently across time, users, and devices?” A narrow deployment view undercounts the people, testing, and maintenance required to make passwordless sign-in actually stick.
Why deployment is only the first cost centre
Implementation usually starts with platform integration, but passkeys touch more than a single login screen. Teams have to connect identity providers, application flows, device registries, recovery options, and user support processes. If passkeys are added to an existing authentication stack, there is also the cost of coexistence: passwords, MFA, and fallback paths often remain in place for a while, which increases design and support effort.
Passkeys also create product and platform dependency costs. A “done” rollout is rarely done in practice because browser behaviour, operating system support, and authenticator standards continue to change. Organisations should expect repeated engineering work to keep enrolment, assertion, recovery, and step-up flows working after updates, not just at launch.
For teams planning that work, Passwordless and Passkeys Guide is useful for understanding the rollout and recovery considerations that shape operational cost.
Which hidden costs are easy to miss?
The largest cost overruns usually come from operational friction, not cryptography. Device support is a good example: some users will need platform authenticators, others will rely on security keys, and some environments will still require alternate flows for shared workstations, legacy browsers, or managed endpoints. Each exception adds policy, support, and documentation overhead.
Regression testing is another recurring cost. Authentication changes can break enrolment, account recovery, single sign-on, conditional access, or application-specific session handling. When passkeys are introduced in a production environment, every login change should be tested against real-world edge cases, including browser upgrades, mobile handoff, and account recovery after device loss.
Ongoing maintenance also includes standards alignment. When authenticator guidance, device support patterns, or assurance expectations change, the organisation may need to revise policy, error handling, and fallback logic. A passkey programme that ignores those updates will gradually accumulate exceptions and support tickets, which quietly erodes the original business case.
NIST SP 800-63 Digital Identity Guidelines is the clearest external reference for thinking about authenticator assurance, phishing resistance, and the operational implications of keeping authentication current.
How should finance and security teams think about total cost?
The right model treats passkeys as an authentication capability with lifecycle cost, not a one-time project. That means separating build cost, migration cost, support cost, and steady-state maintenance. It also means assigning ownership: product or engineering may carry implementation, identity teams may own policy and recovery, service desk teams may absorb user-facing support, and security may own assurance, testing, and exception handling.
A useful rule is to budget for the failure states, not only the happy path. If a user loses a device, changes browser, replaces hardware, or cannot complete recovery, the organisation still needs a safe path back in. Those recovery and support paths are part of the cost of a passkey programme, because they directly affect adoption, help-desk load, and the credibility of the control.
What to prioritise: Cost model the full authentication journey, including recovery and support, before committing to rollout estimates. The cheapest passkey deployment on paper is often the one that excludes the most operationally expensive parts of keeping it reliable.
What to verify: Confirm that integration estimates include regression testing, device coverage, and standards maintenance, not just engineering time for initial enablement. If those items are missing, the model is incomplete.
Practitioner takeaway: Passkeys should be budgeted as an operating capability with ongoing support and change management, because the real cost is maintaining trustworthy sign-in after the first release, not simply turning it on.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
NIST SP 800-63, NIST SP 800-53 Rev 5 and CIS Controls v8 set the technical controls, while ISO/IEC 27001:2022 defines the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-63 | Digital Identity Guidelines | Passkeys are an authenticator choice governed by assurance and lifecycle guidance. |
| Recommendation — Use the guidance to budget for enrollment, recovery, and ongoing authenticator assurance. | ||
| NIST SP 800-53 Rev 5 | IA-5 — Authenticator Management | Total cost includes lifecycle handling of authenticators and their support burden. |
| IA-2 — Identification and Authentication (Organizational Users) | Passkey rollout affects organisational user sign-in, support, and assurance. | |
| Recommendation — Plan for authenticator lifecycle, rotation, recovery, and maintenance costs. Map passkey operating costs to user authentication, recovery, and help-desk workflows. | ||
| ISO/IEC 27001:2022 | A.5.15 — Access control | Passkeys change access control processes, fallback paths, and support operations. |
| Recommendation — Update access-control procedures to cover rollout, exceptions, and lifecycle support. | ||
| CIS Controls v8 | CIS-5 — Account Management | Passkey costs include account lifecycle, recovery, and administrative support. |
| Recommendation — Include account recovery and lifecycle administration in the deployment budget. | ||
Related resources from NHI Mgmt Group
- What should organisations include in IGA total cost of ownership calculations?
- What do organisations get wrong about SaaS total cost of ownership?
- How should organisations evaluate the total cost of ownership for an IGA platform before buying it?
- Should organisations include ownership checks in offboarding workflows?
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Reviewed and updated by the NHIMG editorial team on October 11, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org