Pillar / Real cost drivers (year 2+ surveillance)

SOC 2 ongoing cost: years 2, 3, and beyond.

Type 2 reports are point-in-time but the controls operate continuously. Year 2 onward is where most teams under-budget. This page plots the multi-year curve across three scenarios so CFOs can approve a real budget, not a year-1 figure that silently extends.

Section 01

What stays, what drops

Cost line	Year 1	Year 2	Year 3
Audit fee	Full	80 to 90% of year 1	85 to 95% of year 2 (modest escalation)
Readiness assessment	Full	£0 (drops)	£0 (drops)
Remediation engagement	Up to 5x readiness fee	£0 (drops, unless scope creep)	£0 (drops, unless scope creep)
GRC platform	Full	Full (renews annually)	Full (renews annually, possible tier upgrade)
Internal time	300 to 500 hours	150 to 250 hours	150 to 250 hours
Initial tooling capex	Variable	£0 (drops)	£0 (drops)
Legal review	Once	£0 (drops)	£0 (drops)

Section 02

Three-year cost curve

All-in three-year cost by company size, mid-tier CPA, platform-led

Profile	Year 1	Year 2	Year 3	3-year total
Lean SaaS (15 to 30 employees)	£28,000 – £55,000	£20,000 – £35,000	£21,000 – £37,000	£69,000 – £127,000
Mid-market SaaS (50 to 150 employees)	£55,000 – £110,000	£35,000 – £65,000	£37,000 – £68,000	£127,000 – £243,000
Scale-up SaaS (200 to 500 employees)	£110,000 – £220,000	£65,000 – £130,000	£68,000 – £135,000	£243,000 – £485,000

Section 03

Surveillance vs full re-audit

ISO 27001 has surveillance audits in years 2 and 3 priced at roughly 30 to 40 percent of the year-1 Stage 2 fee. SOC 2 does not. Each annual SOC 2 report is essentially a re-audit covering a fresh 12-month observation window. The auditor applies the same methodology to a new evidence sample.

The cost implication is that SOC 2 year-2 and year-3 audit fees are higher than the equivalent surveillance audit cost on ISO 27001. The full ISO 27001 multi-year curve, including year-3 recertification, is on the cluster page at SOC 2 vs ISO 27001.

Section 04

Scope creep at renewal

By year 3, most SOC 2 teams have added something. A new product line that brought a new microservice into scope. A new geography that brought new data flows. A new customer segment that brought a new Trust Services Criterion (most commonly Privacy or Availability). Each adds 10 to 25 percent to the audit fee for that year. None of those increments was on the year-1 budget paper.

Cross-reference

For the year-1 audit fee that drives the multi-year shape, see the audit firm fees page. For the Trust Services Criteria that customers commonly add at renewal, see the Trust Services Criteria page. For the scenario where year 3 is the natural moment to add ISO 27001 alongside SOC 2, see the SOC 2 vs ISO 27001 page.

Section 05

FAQ

How much does SOC 2 cost in year 2?+

Year 2 typically runs at 60 to 70 percent of year 1 all-in cost. The audit fee falls modestly (80 to 90 percent of year 1), readiness drops out, remediation drops out, but the platform subscription persists and the audit cycle repeats. For a 25 to 50 employee SaaS, year 2 lands at £18,000 to £45,000.

Does SOC 2 have a surveillance audit like ISO 27001?+

No. SOC 2 has no formal surveillance audit. Each annual report is a full re-audit covering a fresh observation window. ISO 27001 has surveillance audits in years 2 and 3 that cost less than the year-1 audit. The cost shape across the multi-year cycle is therefore different.

How often do you renew SOC 2?+

Annually. Customers expect a SOC 2 Type 2 report covering the most recent 12-month period. Lapsed reports beyond 12 months are typically rejected by enterprise procurement. The annual cycle is the practical reality, even though SOC 2 has no formal renewal mechanic.

Why do year-3 budgets often blow out?+

Scope creep at renewal. By year 3, most teams have added a new product line, a new region, or an additional Trust Services Criterion at customer request. Each adds 10 to 25 percent to the audit fee that was approved for the original scope. The budget paper for year 3 should anticipate at least one scope change.