Internal Accounting Control Build vs Outsourcing TCO Calculator

Screen the 2026 Korean statutory boundary and compare in-house and outsourced internal accounting control delivery across labor, advisory, assurance, remediation, change-order, and handover costs.

The amounts, hours, and probabilities below are fictional examples—not market benchmarks. Replace every value with your company scope, actual quotes, time samples, external-auditor increment, and exit terms.

Step 1 · Preliminary company-scope check

Legal status does not automatically change the cost inputs. Confirm external-audit scope and exceptions separately for the company.

Prior-year-end total assets

KRW 100m

Used for the KRW 100 billion and KRW 500 billion thresholds.

Prior-year-end employees

people

Used for the fewer-than-six-employee preliminary exception.

Unlisted external-audit status

This selection is ignored when the company is marked as listed.

Listed companyListing status overrides the external-audit selection.Limited company (yuhan hoesa)User-confirmed Decree Article 9(1)1 exception.Specified exempt SPCConfirm the Decree Article 9(1)2 status separately.Disclosure-group memberMay remove the general sub-KRW 500 billion exemption.Business-report filerAlso verify operating-status and evaluation-report disclosure.Financial companyMay remove the general sub-KRW 500 billion exemption.

Shared analysis assumptions and unavoidable cost

Apply one horizon, discount rate, and KRW time value to both alternatives, while separating shared system, auditor, and training cost.

Analysis horizon

years

Annual discount rate

Use a company cost of capital or internal hurdle-rate assumption.

Annual recurring-cost growth

Applied equally to both alternatives from year two.

Loaded internal hourly cost

KRW

Use one consistent employer-level value, not salary alone.

Shared initial system and control remediation

KRW

Shared ERP access, log, interface, and evidence-repository work.

Annual external-auditor incremental fee

KRW

Enter the actual review or audit increment; no statutory rate is assumed.

Annual shared governance and training

KRW

In-house-led build and operation

Include often-hidden internal effort, limited specialist review, tools, operating evaluation, and expected remediation.

Initial design and documentation hours

hours

Include scoping, processes, risks, controls, first evaluation, and reporting.

Initial training and documentation tools

KRW

Initial specialist and quality review

KRW

Limited external help for specialist accounting, IT controls, and quality review.

Annual operation, evaluation, and audit-response hours

hours

Annual tools and independent testing

KRW

Annual remediation-event probability

A user budget assumption for one defined event, not a benchmark probability.

Cost per remediation event

KRW

In-house exit and transition cost

KRW

Outsourced support build and operation

Include initial and recurring fees, retained company effort, change orders, and contract-exit handoff.

Initial outsourced advisory fee

KRW

Actual scoped quote for RCM, narratives, flowcharts, policy, and first evaluation.

Initial retained company hours

hours

Data provision, interviews, control-owner review, and management approval.

Annual managed-service fee

KRW

Annual retained company hours

hours

Control performance, judgment, approval, and reporting remain with the company.

Annual change-order probability

One defined scope, ERP, process, or group-change event.

Cost per change order

KRW

Outsource exit and handoff cost

KRW

Recovery and transfer of source RCM, evidence, access, and operating knowledge.

Preliminary 2026 Korean internal-accounting scope

The unlisted external-audit company was entered with assets of KRW 500 billion or more.

Official sources checked: 2026-08-10

Operating-duty status: Preliminarily in scope
External-auditor level: External-auditor review
Applied thresholds: KRW 100bn for listed-company audit and base exception · KRW 500bn general Decree exception · fewer than 6 employees

Outsourced support does not transfer the representative, internal-accounting manager, statutory auditor or audit committee duties, or the company’s responsibility to perform controls and approve reports.

TCO comparison at current inputs

Cost position

Near parity on cost

Difference versus two-option average: 1.394%

Potential PV saving

KRW 6,057,105

Absolute difference between present-value TCO estimates

Parity annual managed-service fee

KRW 47,143,578

One-factor threshold with all other inputs fixed

Internal-hour difference with outsourcing

3,000 hours

A positive value means fewer internal hours under outsourcing

In-house-led build and operation

Initial cost: KRW 182,000,000
Year-one recurring cost: KRW 89,000,000
Expected annual event cost: KRW 4,500,000
Exit and handoff cost: KRW 5,000,000
Initial internal hours: 1,800 hours
Annual internal hours: 900 hours
Annual internal FTE equivalent: 0.433 FTE
Internal hours in horizon: 4,500 hours
Nominal TCO: KRW 462,090,100
PV TCO: KRW 437,685,134
PV-equivalent annual cost: KRW 159,404,788

Outsourced support build and operation

Initial cost: KRW 169,000,000
Year-one recurring cost: KRW 87,000,000
Expected annual event cost: KRW 4,500,000
Exit and handoff cost: KRW 20,000,000
Initial internal hours: 600 hours
Annual internal hours: 300 hours
Annual internal FTE equivalent: 0.144 FTE
Internal hours in horizon: 1,500 hours
Nominal TCO: KRW 457,908,300
PV TCO: KRW 431,628,029
PV-equivalent annual cost: KRW 157,198,793

Outsource quote thresholds and cumulative crossover

Maximum initial outsource advisory fee: KRW 106,057,105
Parity annual managed-service fee: KRW 47,143,578
Sustained cumulative-cost crossover: No sustained crossover in horizon
Shared-cost PV: KRW 80,862,547

Cost-component comparison

Cost-component comparison
Cost category	In-house nominal	In-house PV	Outsource nominal	Outsource PV
Shared initial systems and controls	KRW 30,000,000	KRW 30,000,000	KRW 30,000,000	KRW 30,000,000
Shared auditor and training	KRW 55,636,200	KRW 50,862,547	KRW 55,636,200	KRW 50,862,547
Initial external and tool cost	KRW 35,000,000	KRW 35,000,000	KRW 100,000,000	KRW 100,000,000
Internal effort	KRW 297,817,650	KRW 282,303,278	KRW 99,272,550	KRW 94,101,093
Recurring services and tools	KRW 24,727,200	KRW 22,605,576	KRW 139,090,500	KRW 127,156,367
Expected remediation or change	KRW 13,909,050	KRW 12,715,637	KRW 13,909,050	KRW 12,715,637
Exit and handoff	KRW 5,000,000	KRW 4,198,096	KRW 20,000,000	KRW 16,792,386

Annual cost and cumulative PV

Annual cost and cumulative PV
Year	In-house-led build and operation Annual cost	Outsourced support build and operation Annual cost	In-house PV	Outsource PV	Year-end position
1 years	KRW 271,000,000	KRW 256,000,000	KRW 268,246,936	KRW 253,308,802	Outsourced support lower cost
2 years	KRW 91,670,000	KRW 89,610,000	KRW 352,052,920	KRW 335,231,506	Near parity on cost
3 years	KRW 99,420,100	KRW 112,298,300	KRW 437,685,134	KRW 431,628,029	Near parity on cost

Fixed sensitivity scenarios

This is not a probability forecast. It tests in-house hours +20%, outsource fees +20%, doubled event costs, and a combined downside.

Fixed sensitivity scenarios
Scenario	In-house PV	Outsource PV	PV gap	Difference versus two-option average	Year-end position
Base	KRW 437,685,134	KRW 431,628,029	KRW 6,057,105	1.394%	Near parity on cost
In-house hours +20%	KRW 494,145,790	KRW 431,628,029	KRW 62,517,760	13.506%	Outsourced support lower cost
Outsource fees +20%	KRW 437,685,134	KRW 482,960,907	KRW 45,275,773	9.836%	In-house-led lower cost
Event costs doubled	KRW 450,400,771	KRW 444,343,666	KRW 6,057,105	1.354%	Near parity on cost
Combined downside	KRW 506,861,426	KRW 498,219,671	KRW 8,641,755	1.72%	Near parity on cost

Input and interpretation checks

PV TCO differs by no more than 5% of the two-option average. Review capability, independence, quality, and contract scope before deciding.
The cost position changes in a fixed sensitivity. Obtain better time samples, quote scope, and change-order terms.

Legal and cost-model boundary

Korean External Audit Act ID 001701/MST 270309 Articles 2, 4 and 8; Decree ID 004940/MST 286317 Articles 5 and 9; and FSC Notice 2026-19 Articles 6, 6-2 and 7 were checked on 2026-08-10. This calculator provides only a preliminary scope guide and user-entered TCO. It does not determine external-audit status, materiality, control scope, deficiency classification, audit or review opinion, market price, appropriate staffing, hours, probability, independence, tax, accounting, or contract compliance.

Related calculators

What does this internal accounting control TCO calculator compare?

A Korean company preparing or upgrading its internal accounting control system can perform much of the work with its own team or engage an outside advisory provider.
A fee quote alone does not describe the economic boundary of either choice.
An in-house program consumes finance, information technology, process-owner, internal-audit, and executive-review time, while an outsourced program still requires company data, interviews, review, approval, remediation, auditor coordination, and handover work.
This calculator places those costs on the same boundary and discounts as many as ten years of monthly cash outflows to a common valuation date.

The result reports nominal total cost of ownership, present-value TCO, equivalent annual cost, internal hours, savings, and the percentage difference between the alternatives.
It also solves for the maximum initial advisory fee and recurring annual service fee that would leave outsourcing economically tied with the in-house alternative, then reruns fixed downside scenarios.
The output is a budgeting and procurement aid, not a legal conclusion, assurance opinion, control-quality certification, market-price quote, or vendor recommendation.

Preliminary legal scope

Start with a user-confirmed external-audit status, then apply listed status, assets, workforce, and statutory exception inputs

Comparable cost boundaries

Keep genuinely common system and assurance costs separate while recognizing internal labor that remains under both delivery models

Negotiation thresholds

Translate the present-value difference into break-even ceilings for the initial outsourced project fee and recurring service fee

Read the 2026 Korean legal screen in the correct order

The scope screen is deliberately a preliminary decision aid rather than a complete statutory engine.
First determine whether the company is subject to an external audit under Article 4 of the Act on External Audit of Stock Companies and Article 5 of its Enforcement Decree.
Those provisions can depend on company form and several financial and workforce measures, so the calculator asks the user to enter a status already confirmed by the company, its auditor, or another qualified adviser.
It does not infer full external-audit status from assets alone.

Preliminary sequence for Korean internal accounting control scope
Sequence	Input or threshold	Preliminary output
1. External-audit status	User-confirmed subject, not subject, or confirmation needed	No statutory build duty if not subject; professional confirmation if unresolved
2. Very small workforce	Fewer than 6 employees	Possible exclusion under Article 6-2 of the supervisory regulation
3. Entity form	Limited company or specified special-purpose company	Possible exception under Article 9 of the Enforcement Decree
4. Small unlisted company	Assets below KRW 100 billion	Preliminary exception under Article 8 of the Act
5. Decree exception	Unlisted company with assets below KRW 500 billion	Possible exception unless another listed exclusion applies
6. Review or audit	Listed company with assets of at least KRW 100 billion	Audit if the threshold is met; otherwise review for an in-scope company

A threshold is not a legal safe harbor by itself

The KRW 100 billion threshold appears in more than one context, but it does not have one universal meaning.
It is relevant both to an exception for certain unlisted companies and to the audit level for listed companies.
The exception for an unlisted company below KRW 500 billion may be unavailable to a listed company, a member of a designated disclosure group, a business-report filer, a financial company, or another excluded entity.
A merger, split, listing process, group designation, industry classification, fiscal-year transition rule, or other fact outside these inputs can change the answer.

Why outsourcing does not transfer management responsibility

An advisory firm can facilitate scoping, document narratives and risk-control matrices, help design controls, prepare testing methods, collect evidence, or support remediation.
That support does not transfer the representative director’s statutory responsibility to establish and operate the system, the internal accounting manager’s assigned work, or required reporting and evaluation duties.
Process owners still need to operate controls, management must make judgments and approve reports, and the statutory auditor or audit committee must perform its own evaluation.

The company should therefore define a responsible owner, reviewer, approver, evidence custodian, issue-escalation route, and retained internal workload even for a managed service.
The outsourcing input is not zero internal hours because a zero-hour assumption would understate both cost and delivery risk.
Auditor independence and the permissibility of non-assurance services also require a separate check when the advisory provider is the external auditor or belongs to a related network.

Build a comparable cost boundary before entering numbers

A useful TCO comparison begins with a common statement of work.
Align the number of legal entities and locations, significant accounts, business processes, key information systems, entity-level controls, information-technology general controls, control population, testing samples, deliverable format, site visits, remediation support, and external-auditor coordination.
If one proposal includes testing and the other covers documentation only, a precise calculation will still compare unlike services.

Common costs

Initial repository, workflow, access-control, and evidence-retention system cost
External review or audit fees that do not change with the delivery model
Board, audit-committee, management reporting, and recurring governance cost
A consistent annual growth assumption for recurring monetary inputs

In-house costs

Initial interviews, scoping, design, documentation, testing, and project-management hours
Training, specialist assistance, documentation tools, and initial implementation support
Annual operation, population collection, testing, deficiency evaluation, and remediation hours
Expected regulatory or system-change work plus end-of-horizon cleanup cost

Outsourced costs

Initial diagnostic, design, documentation, and implementation advisory fee
Recurring managed-service, update, testing-support, or documentation-maintenance fee
Retained company hours for data, interviews, review, approval, and issue ownership
Expected change orders and editable-file, account, evidence, and knowledge handover cost

Loaded internal hourly cost

Salary alone can materially understate internal labor.
A planning rate can combine salary, employer payroll charges, benefits, variable compensation, workspace, technology, and reasonable management overhead, divided by productive annual hours.
The display converts hours to illustrative full-time equivalents using 2,080 hours per year, but monetary calculations use the entered hourly cost directly.

How the cash-flow model works

Initial cash outflows occur at month zero.
Annual recurring and probability-weighted event costs are distributed evenly across each year, while terminal handover or cleanup cost occurs in the final month.
The annual cost-growth assumption begins in year two, and the annual discount rate is converted into an effective monthly rate so payments at different dates share one valuation basis.

Internal labor cost

Internal work hours multiplied by loaded internal hourly cost

Expected event cost

Probability of occurrence multiplied by cost if the event occurs

Monthly discount rate

(1 + annual discount rate) raised to 1/12, minus 1

Present-value TCO

Sum of every monthly cash outflow divided by the monthly discount factor

Percentage difference

Absolute present-value gap divided by the lower present-value TCO

Equivalent annual cost

Present-value TCO converted into a level annual amount over the selected horizon

Reading the default worked example

The defaults use a three-year horizon, a 6% annual discount rate, 3% annual cost growth, and KRW 65,000 of loaded cost per internal hour.
Under those assumptions, in-house present-value TCO is approximately KRW 437.69 million and outsourced present-value TCO is approximately KRW 431.63 million.
Outsourcing is lower by approximately KRW 6.06 million, but the difference is only about 1.39%, so the calculator labels the result a near tie rather than a decisive economic advantage.
In-house delivery uses 4,500 internal hours over the horizon and outsourcing uses 1,500 hours, a difference of 3,000 hours.
Those released hours represent capacity, not automatic cash savings or headcount reduction.
The break-even outsourced initial fee is approximately KRW 106.06 million, and the break-even annual recurring fee is approximately KRW 47.14 million under the same assumptions.

Interpret the break-even fees correctly

The initial-fee ceiling answers a narrow question: with every other input unchanged, what initial outsourced advisory fee would make the two present-value TCO totals equal?
The recurring-fee ceiling asks the same question for the year-one annual managed-service fee while preserving the selected growth rate and timing convention.
These figures are useful negotiation anchors because they translate a multi-year discounted model into recognizable contract line items.

They are not fair-market-value opinions, target prices, or a conclusion that any quote below the ceiling is acceptable.
A lower fee may exclude locations, systems, testing, remediation, auditor support, security commitments, travel, or editable source files.
A negative break-even ceiling means the rest of the outsourced cost structure already exceeds the in-house alternative before that line item is added.
A missing recurring threshold can occur when the fee has no usable discounted weight under the entered horizon or validation boundary.

Use sensitivity scenarios as questions, not forecasts

A single base case can hide the assumption that controls the recommendation.
The calculator therefore reruns four fixed stresses: in-house hours increase by 20%, outsourced advisory and service fees increase by 20%, expected event costs double for both alternatives, and all three stresses occur together.
These are transparent comparison shocks, not predicted probabilities or statistical confidence intervals.

Build a base case approved by finance, information technology, process owners, internal audit, and the responsible executive, with a traceable source for each material input
Identify which stress changes the preferred alternative, then validate that input with time records, prior projects, a pilot, or a revised vendor statement of work
Compare the fee ceiling with the complete commercial proposal, including travel, taxes, licenses, change orders, data extraction, and exit assistance
If the result remains close, document capability development, schedule confidence, control quality, security, continuity, independence, and vendor-switching risk rather than treating the lower point estimate as a command

Add a non-price decision review

Non-price review for in-house and outsourced internal accounting control delivery
Criterion	In-house review	Outsourced review
Capability and continuity	Experienced designers, testers, reviewers, and backup ownership	Named team, substitution rules, availability, and knowledge transfer
Scope and quality	Documented criteria, sampling method, review trail, and remediation ownership	Explicit inclusions, exclusions, acceptance tests, and rework obligations
Independence and conflicts	Segregation between control operation, testing, and review	Auditor relationship and advance clearance for permissible services
Data protection	Evidence permissions, retention, access logs, and deletion controls	Data location, subprocessors, remote access, return, and destruction evidence
Exit and transition	Current manuals, editable files, and trained replacement owners	Source-file ownership, account transfer, assistance period, and exit pricing

Practical use cases

New external-audit company

Confirm why and when the company enters external-audit scope, then separate first-year design and documentation work from recurring operation and testing so a proposal that looks inexpensive only because later managed-service or change-order work is excluded becomes visible

Listing preparation

Model current obligations and the expected post-listing assurance level as separate cases, then test a delay or scope expansion by changing the horizon, internal hours, advisory fee, and recurring workload

Existing-system enhancement

Set reusable documentation and tools to common cost or zero, then compare only incremental work for information-technology controls, consolidation scope, testing automation, or remediation

Outsourcing renewal

Use actual retained company hours and historical change orders rather than the original sales estimate, including termination and handover so supplier lock-in becomes visible before renewal

Frequently asked questions

Is a company with assets below KRW 100 billion always exempt?

No; external-audit status, listed status, company form, workforce, and other exceptions must be read in sequence, while consolidated or separate reporting scope, effective dates, transition provisions, and facts not captured here may also matter

Does the calculator determine external-audit status automatically?

No; Article 4 of the Act and Article 5 of the Enforcement Decree can consider liabilities, revenue, employees, company form, and other conditions in addition to assets, so enter a status confirmed from the full facts

Does an advisory provider assume management responsibility?

No; management responsibility, operation by control owners, internal accounting manager duties, approvals, and statutory reporting remain with the company, and the contract should describe support without obscuring accountable owners

Why is external review or audit cost entered as common cost?

A fee that remains the same under both delivery models does not drive the choice, so if one model changes auditor-support hours or incremental assurance fees, place only that difference in the relevant alternative

Should the lower present-value TCO always win?

No; a close result or a recommendation that changes under sensitivity testing calls for a broader review of quality, schedule, capability, independence, security, continuity, deliverable ownership, and switching risk

Are value-added tax and income-tax effects included?

No; every entered amount is treated as a cash outflow, so use a consistent pre-tax or after-tax basis and obtain accounting and tax advice for recoverable tax, capitalization, amortization, and income-tax effects

Official sources and update boundary

The statutory screen was checked against current data from the Korean National Law Information Center on August 10, 2026.
The principal provisions are Articles 2, 4, and 8 of the Act on External Audit of Stock Companies, Act No. 20896; Articles 5 and 9 of its Enforcement Decree, Presidential Decree No. 36358; and Articles 6, 6-2, and 7 of the Regulation on External Audit and Accounting, Financial Services Commission Notice No. 2026-19.
The versions reviewed were effective April 1, 2025 for the Act, May 26, 2026 for the Enforcement Decree, and June 2, 2026 for the supervisory regulation.
Recheck the official Korean text, amendments, regulatory interpretations, fiscal-year application, and transition provisions before an actual compliance or assurance decision.
The English names and summaries on this page are navigation aids; the official Korean text controls.

Compare both proposals on one complete boundary

Replace the defaults with traceable internal hours, loaded labor cost, advisory quotes, assurance fees, change-order risk, and handover cost.
Use the resulting TCO and sensitivity table as a starting point, then confirm legal scope, control quality, independence, tax treatment, and contract terms with qualified Korean accounting and legal advisers.