Pillar / Budget sanity check by company size

SOC 2 cost for scale-ups: Series B and beyond.

At 100 to 500 employees, SOC 2 is not optional and not new. The cost question becomes: what scope, what auditor tier, and what concurrent standards. This page sets out the brackets and the multi-entity premium.

Section 01

Cost brackets

SOC 2 Type 2 cost brackets at scale, mid-tier CPA baseline

Bracket	Year-1 all-in	Notes
100 to 200 employees	£50,000 – £100,000	Single-entity scope, mid-tier CPA, Security + Confidentiality + sometimes Availability. Standard scale-up SOC 2 profile.
200 to 500 employees	£75,000 – £150,000	Often multi-entity (subsidiary or acquired company), broader TSC scope, mid-tier CPA at the upper end of their fee band.
500+ employees	£100,000 – £250,000	Multi-entity, multi-region. Big 4 sometimes justified by buyer requirements. Concurrent ISO 27001 typical.

Section 02

Multi-entity scoping

A holding company with multiple operating entities, multiple products under separate brands, or international subsidiaries faces a multi-entity scoping decision. There are three workable patterns.

Single combined report covering all entities under one parent engagement. Cost-efficient if the entities share infrastructure and management. Adds 15 to 25 percent to the single-entity fee for each additional entity.

Separate reports per entity. Necessary where entities operate under different brands and serve different customer bases. Each report carries the full audit fee. Total cost is roughly 1.7 to 2.0x a single combined report.

Carve-out method (one parent report, named entities excluded). Useful where some entities are out-of-scope (different jurisdiction, different product, recent acquisition not yet integrated). The carve-out has to be documented in the report and accepted by the customer; complex carve-outs are a common point of audit-fee inflation.

Section 03

Concurrent-standard pattern

At scale-up size, SOC 2 is rarely the only standard pursued. ISO 27001 follows naturally for international customers; GDPR compliance comes with EU customers; HIPAA with US healthcare customers; PCI DSS where card payments are processed. Concurrent programmes save 30 to 40 percent vs sequential when three conditions are met: the audit firm is dual-accredited, the platform supports both standards, and readiness is run as a single workstream.

Section 04

The fintech crossover

Fintech and payments scale-ups typically run SOC 2 alongside KYC and AML programme spend, and procurement reviews tend to look at the combined operational cost rather than each line in isolation. The KYC side of that budget is detailed at kyccost.com. The combined operational compliance budget for a 200-person fintech typically lands at £350,000 to £700,000 per year across SOC 2, KYC, AML, GDPR, and PCI DSS where applicable. That figure approves better as a combined number than as five separate budget lines.

Section 05

What scale-ups consistently get right

Multi-year budgets. Scale-up CFOs approve three-year compliance budgets, not annual ones. The ongoing-cost shape is genuinely understood, and surprise year-3 spend is rare. Mid-tier compliance leads run rolling forecasts.

Auditor relationships. By Series B, most scale-ups have a named audit firm partner who runs SOC 2 across multiple cycles. That continuity reduces audit-fee inflation and surfaces scope-creep cost lines early.

Cross-reference

For the audit-firm tier choice at scale-up size, see the audit firm fees page. For the GRC platform tier that fits 200 to 500 employees, see the GRC platforms page. For the concurrent SOC 2 + ISO 27001 budget math, see the SOC 2 vs ISO 27001 page.

Section 06

FAQ

When does SOC 2 require Big 4 instead of mid-tier CPA?+

Where downstream buyers explicitly require it: tier-one banks, defence and intelligence, certain regulated insurers, and a small subset of FTSE-listed enterprise procurement. Outside those, mid-tier firms deliver the same SOC 2 attestation at 30 to 50 percent of the cost.

How does multi-entity scope change the cost?+

Each additional entity (subsidiary, acquired company, international branch) typically adds 15 to 25 percent to the audit fee, plus its own readiness work. Multi-entity scope is also where Big 4 process discipline starts to earn its premium.

Should scale-ups run SOC 2 alongside ISO 27001?+

For most scale-ups with international customers, yes. Concurrent SOC 2 + ISO 27001 audits typically save 30 to 40 percent on combined fees vs sequential. The 80 percent control overlap means readiness is shared, evidence is shared, and policies are dual-purpose.

Is there a SOC 2 cost benefit at scale?+

Per-employee cost falls. A 500-person company does not pay 10x the audit fee of a 50-person company; it pays 3 to 5x. The per-employee cost of SOC 2 falls materially with scale. The absolute cost still rises and is harder to budget because multi-entity and multi-region complexity grows faster than headcount.