Security Robot CAPEX vs OPEX: The 2026 Decision

The question has been on every plant manager's desk since Q4 2024. Buy or rent. Capitalise or expense. The following figures come from real tenders placed by mid-sized industrial operators with annual revenues between €50 million and €500 million.

Buy or Rent: The Core Decision

Purchasing an autonomous outdoor unit ties up between €180,000 and €250,000 per robot, depreciated over five years. Maintenance, software licences, and spare parts are additional. The unit is operational after a delivery lead time of three to six months.

Under the RaaS model, the operator pays €3,500 per month for a QR-2 unit. Delivery occurs within 48 hours. Maintenance, updates, and a replacement device are included.

The balance-sheet paths diverge immediately. CAPEX activates the asset in fixed assets. OPEX is expensed in full in the current financial year. The cash-flow advantage in year one is approximately €200,000 per site.

Residual-value risk is the underestimated line item. Under the CAPEX model, the operator bears every technological write-down. Under the OPEX model, that risk sits with the provider.

TCO Comparison over 60 Months

The five-year calculation exposes the structural difference.

CAPEX path: €220,000 acquisition, €18,000 maintenance per year, €12,000 software updates per year. Total after 60 months: €370,000. Excluding insurance, storage space, and replacement batteries.

OPEX path: 60 months at €3,500 equals €210,000. Maintenance, updates, replacement device, and connection to the operations control centre are included.

The personnel comparison shifts the scale entirely. A 24/7-staffed Posten (guard post) costs between €15,000 and €25,000 per month according to BDSW industry data, depending on the Tarifgebiet and qualification level. One QR-2 robot replaces that Streife in the outdoor perimeter at a gross cost of €3,500 per month.

Hidden CAPEX items absent from every quote: machinery insurance, climate-controlled storage for spare units, on-call maintenance technicians, replacement battery inventory. These items add between €8,000 and €14,000 annually.

The OPEX model scales without a new investment approval. Site four carries the same monthly rate as site one. The TCO break-even against a conventional Wachposten is reached in month four.

Detailed cost structures are covered in the TCO comparison for security guard costs.

Balance-Sheet Treatment under HGB and IFRS

The auditor has a say here, not the security department.

Under HGB, a purchased security robot is capitalised as a tangible fixed asset. Straight-line depreciation runs over five to seven years, depending on the operational useful life. For tax purposes, the AfA reduces profit only on a pro-rata basis.

Under the OPEX model, the operator books the monthly rate entirely as an expense. No capitalisation, no impairment test, no residual book value.

One point is systematically overlooked: IFRS 16. Lease contracts with a term below twelve months remain off-balance-sheet. The Quarero standard contract runs 24 months with quarterly termination rights thereafter. This means IFRS 16 applies in principle: a right-of-use asset and a corresponding lease liability arise. Operators reporting under IFRS align this effect with their auditor before signing. Under HGB, the expense remains pure rental cost.

The impact on the equity ratio differs accordingly. Pure OPEX under HGB keeps the balance sheet total lean. Under IFRS 16, the obligation appears on the liability side but remains shorter and more transparent than a capitalised own investment.

For tax purposes, the monthly rate reduces pre-tax profit immediately. The CAPEX variant spreads that effect over the depreciation period.

Risk Allocation between Operator and Provider

A TCO table does not show who carries which risk. That question is settled in the contract.

Technology risk: Sensor technology in autonomous mobile robotics becomes obsolete after 30–36 months in practice. Under the CAPEX model, the operator bears that obsolescence entirely. Under the RaaS contract, Quarero replaces outdated sensor units within the service term.

Failure risk: SLA-based device replacement within 48 hours is a contractual obligation. Under the CAPEX model, a hardware defect means either in-house repair or external workshop logistics with uncertain lead times.

Cyber risk: Software patches required under NIS-2 Article 21 are applied continuously under the RaaS contract. The owner of a purchased unit must establish its own patch-management processes.

Compliance risk: Under the OPEX model, the provider is liable for ongoing conformity with the EU Machinery Regulation 2023/1230 and EN ISO 13482. On purchase, that responsibility transfers to the operator with title.

When CAPEX Is Still the Right Answer

OPEX is not the correct answer in every case. Four constellations favour purchase.

First: with ten or more units at the same site and a planning horizon of at least ten years, the scale effects of an owned fleet outperform the rental rate. Internal maintenance capacity is a prerequisite.

Second: where state subsidy programmes require capitalisation. Some investment grants require the asset to appear in the recipient's fixed assets.

Third: for classified contracts requiring hardware ownership. Defence-adjacent and some KRITIS-adjacent tenders require hardware ownership for secrecy reasons.

Fourth: where an in-house robotics maintenance team with a spare-parts inventory already exists. Operators who run that infrastructure carry the marginal cost of one additional unit below any external service contract.

In all other cases, OPEX is the stronger balance-sheet choice.

RaaS Contract Structure at Quarero

The terms are standardised. That accelerates compliance review and board approval.

Minimum term: 24 months. Quarterly termination rights thereafter. This structure triggers IFRS 16. Alignment with group audit before signing is required.

Delivery: 48 hours from contract signature. Commissioning and geofence calibration are carried out on the first working day by Quarero technicians.

Included in scope: hardware, software updates, preventive maintenance, replacement device on failure, connection to the operations control centre.

Three sensor tiers: QR-1 at €3,200 covers light indoor environments. QR-2 at €3,500 is designed for 24/7 outdoor areas (thermal sensors, LiDAR). QR-3 at €3,800 is for KRITIS facilities with redundant sensors and ATEX certification. Full details are in the three-tier pricing model.

The escalation path to human security personnel remains contractually defined. The robot replaces the Streife and Posten functions, not intervention forces. Handover to a human escalation service is part of the contract.

Scaling to additional sites requires no renegotiation of framework terms. One master agreement covers an unlimited number of units at the agreed rates. The complete structure is described in the Robotics-as-a-Service model.

Decision Matrix for the Board

Five questions are sufficient for the next board submission.

Question 1: How many sites are affected? Above three, OPEX is favoured because scaling requires no further investment approval.

Question 2: What is the planning horizon? Below seven years, OPEX is favoured because technology obsolescence erodes the residual value before depreciation ends.

Question 3: How sensitive is the cash flow? With tight working capital or covenant-bound debt, OPEX is favoured because it protects balance-sheet ratios.

Question 4: Does the site hold KRITIS status under the KRITIS-Dachgesetz? If so, QR-3 as an OPEX solution, because conformity with NIS-2 and the KRITIS sector regulations is achieved faster through continuous software updates than through in-house development.

Question 5: Is internal robotics expertise available? Without it, OPEX is favoured because maintenance, cybersecurity, and compliance are fully externalised.

Three or more answers favouring OPEX settle the board question. A fully worked example with concrete figures is available in the hybrid perimeter protection calculation for industrial parks.

Next Steps and Pilot Conditions

The pilot phase runs for 90 days at standard OPEX rates. No investment approval and no capitalisation are required. Termination at the end of 90 days carries no follow-on costs.

Site assessment is completed within five working days of the request. It covers perimeter analysis, geofence proposal, escalation scheme, and a written offer specifying the sensor tier.

Integration into existing control-room systems runs via open interfaces. Standard protocols are ONVIF, MQTT, and REST. Existing control-room connections via Bosch BIS, Siemens Siveillance, or Genetec Security Center are standard scope.

The follow-on contract after the pilot includes volume discounts from the third site onward. Exact discount tiers are included with the pilot offer.

Documentation for internal audit and external auditors is supplied with the contract. It covers: contract analysis for HGB and IFRS, risk-allocation matrix, technical specification of the delivered unit, and conformity certificates under the EU Machinery Regulation and EN ISO 13482.

Operators wishing to start the pilot submit the pilot request via the contact form. Commercial terms and the draft contract follow under the Robotics-as-a-Service model.