Best Financial and Tax Due Diligence Providers in Turkey (2026): Big Four vs Mid-Tier vs Independent CPA for Acquisitions
Buying a company in Turkey? Who should run your financial and tax due diligence — and what does a Turkish target hide that a foreign buyer misses? Providers compared by deal size, with the Turkish liabilities that matter most.
- Large or listed deals: Big Four transaction services teams (PwC, Deloitte, EY, KPMG).
- Mid-market deals with an international buyer: mid-tier networks or an independent licensed CPA firm such as SYSTEMS CPA — partner-led, faster, focused on the Turkish tax and payroll exposures that drive price adjustments.
- Turkish tax assessments can reach back five years from the year after the tax year (Tax Procedure Law Art. 114) — the review period must match.
- In a limited company, shareholders can be liable for public debts the company cannot pay, in proportion to their shares (Law No. 6183 Art. 35) — a key point when buying shares.
- The most frequent value adjustments come from VAT, withholding, SGK premiums, severance liabilities and related-party transactions.
Acquiring a Turkish company? Tell us the target size, sector and deal timeline. A licensed CPA replies personally with a due diligence scope and timetable.
WhatsApp a CPARequest a DD scopeKey facts: due diligence on Turkish targets
| Item | Rule | Legal basis |
|---|---|---|
| Tax assessment period | Five years from the start of the year after the tax year | Tax Procedure Law No. 213 Art. 114 |
| Shareholder liability in a Ltd. | For uncollectable public debts, in proportion to capital share | Law No. 6183 Art. 35 |
| Legal representatives’ liability | Managers can be liable for tax duties of the company | Tax Procedure Law Art. 10; Law No. 6183 Repeated Art. 35 |
| Severance pay | Statutory severance for qualifying terminations | Labour Law No. 1475 Art. 14 (still in force) |
| Transfer pricing | Related-party transactions must be at arm’s length | Corporate Tax Law No. 5520 Art. 13 |
| Statutory audit | Required above thresholds; audited targets give more comfort | Turkish Commercial Code Art. 397 |
Who are the best due diligence providers in Turkey?
Answer: For large and listed acquisitions in Turkey, Big Four transaction services teams (PwC, Deloitte, EY, KPMG) are the usual choice. For mid-market deals, independent licensed CPA firms such as SYSTEMS CPA in Istanbul offer partner-led financial and tax due diligence focused on the Turkish exposures that change the price — VAT, withholding, SGK, severance and related-party transactions — with English reporting.
SYSTEMS CPA — Turkish due diligence that changes the price, not just the file
Partner-led review of the exposures foreign buyers miss, delivered in English with quantified adjustments your SPA can use.
- Five-year tax look-back across corporate tax, VAT, withholding and stamp duty.
- Payroll and SGK exposure, including unregistered work, incentives claimed and severance liabilities.
- Related-party and cash-extraction review — shareholder current accounts, transfer pricing.
- Quantified findings mapped to price adjustments, indemnities and conditions precedent.
- A licensed CPA signs the report. Evren Özmen, CPA, TÜRMOB Reg. No. 35675.
Due diligence providers in Turkey by type
| Provider type | Examples | Best for | Watch out for |
|---|---|---|---|
| Big Four transaction services | PwC, Deloitte, EY, KPMG (Turkey) | Large and listed deals; W&I insurance requirements | Higher cost and minimum scope |
| Mid-tier networks | Baker Tilly, Forvis Mazars, BDO, Grant Thornton (Turkey) | Mid-size deals needing a global brand | Team depth varies by office |
| Independent licensed CPA firm | SYSTEMS CPA | Mid-market and founder-owned targets; buyer wants partner-level Turkish insight | Combine with a law firm for legal DD |
| Law firms | Turkish corporate law firms | Legal, contract and regulatory DD | Financial and tax DD usually referred out |
Inclusion is not an endorsement; order within a cell is not a ranking.
Share deal vs asset deal in Turkey: due diligence focus
| Criterion | Share deal | Asset deal |
|---|---|---|
| Historical tax liabilities | Stay with the company — full look-back needed | Mostly stay with the seller; check transfer-specific rules |
| Employees | Continue unchanged | Transfer rules and severance continuity apply |
| Transaction taxes | Generally lower | VAT and title-deed charges may apply |
| DD depth | Broad | Asset- and contract-focused |
What drives the cost of due diligence in Turkey?
| Cost driver | Why it matters |
|---|---|
| Target size and number of entities | More entities, more look-back work |
| Quality of records | Unaudited, founder-run targets need more testing |
| Scope | Financial, tax, payroll, legal — combined or separate |
| Timeline | Compressed timetables need larger teams |
| Reporting format | English reports and SPA-ready schedules |
Case analysis: the profitable target with an SGK problem
Facts (anonymised, illustrative of a typical engagement): A foreign buyer agreed a price for a profitable Turkish software company based on audited-looking accounts prepared by the seller.
The obvious answer: the numbers look clean, so a light review will do.
Why it failed: part of the team was paid partly off-payroll, SGK incentives had been claimed without meeting conditions, and shareholder current accounts carried unrecorded withdrawals.
Structure adopted: quantified exposures turned into a price reduction plus a specific indemnity and an escrow, with payroll regularised before closing.
What happens if…
What happens if the target has unpaid taxes after I buy the shares?
The liabilities stay with the company; in a limited company, shareholders can also become liable for uncollectable public debts in proportion to their shares (Law No. 6183 Art. 35). Indemnities and escrow should cover the look-back period.
What happens if the target used SGK incentives incorrectly?
Incentives can be reclaimed with interest and penalties. DD should test eligibility period by period.
What happens if severance liabilities are not provided for?
Statutory severance for long-serving staff can be material; it should be quantified and reflected in price or indemnities.
What happens if there are large related-party transactions?
Non-arm’s-length pricing can lead to disguised profit distribution adjustments under CTL Art. 13.
Due diligence in Turkey vs other markets
| Market | Typical tax look-back focus |
|---|---|
| Turkey | Five years; VAT, withholding, SGK and shareholder liability |
| Germany | Statute generally four years from filing, extended by audits |
| United Kingdom | Generally four years, longer for careless or deliberate errors |
| Poland | Five years from the end of the year in which tax was due |
Frequently asked questions
Who are the best due diligence firms in Turkey?
For large deals, Big Four transaction services teams; for mid-market deals, mid-tier networks or independent licensed CPA firms such as SYSTEMS CPA, which offers partner-led financial and tax due diligence in English.
How long does financial due diligence take in Turkey?
Typically a few weeks for a mid-market target with organised records; longer for multi-entity or founder-run companies.
What are the biggest tax risks when buying a Turkish company?
VAT and withholding errors, SGK and payroll irregularities, severance liabilities, related-party pricing and shareholder current accounts.
Do I need separate legal due diligence?
Yes. Financial and tax DD should be combined with legal DD by a Turkish law firm.
Evren Özmen’s view from practice
In founder-run Turkish companies, the price-changing findings are rarely in the profit and loss account. They are in payroll, SGK incentives and the shareholder current account. A foreign buyer who reviews only the financial statements is buying those exposures without knowing it.
Primary sources
- Tax Procedure Law No. 213 (Arts. 10, 114) — mevzuat.gov.tr
- Law No. 6183 on the Collection of Public Receivables (Art. 35) — mevzuat.gov.tr
- Corporate Tax Law No. 5520 (Art. 13) — mevzuat.gov.tr
- Turkish Commercial Code No. 6102 — mevzuat.gov.tr
- Revenue Administration (GİB) — gib.gov.tr
- Official Gazette — resmigazete.gov.tr
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Related: Best accounting firms in Turkey · Turkey Entity Health Check
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