Business expenses are the costs a company pays to keep running and grow its work. These can include anything from office supplies to employee salaries, and understanding exactly which of these costs the Turkish tax system actually allows a business to deduct, and which it does not, is one of the more consequential areas of ongoing compliance for any company operating in Türkiye.
Quick Answer: To be deductible under Turkish law, a business expense must be directly related to generating or maintaining the company's commercial income, properly documented, and issued in the company's own name. Article 39 of Türkiye's Income Tax Law No. 193 defines commercial income under the cash basis method as the positive difference between revenue and expenses within a fiscal period, while Article 40 of the same Law sets out, across eleven categories, the specific expenses that may be deducted from gross revenue in determining that income. Common deductible categories include employee compensation, meals provided to staff, business travel, work related clothing, business registered utilities, rent, software and advertising, office supplies, professional services, and vehicle costs, though several categories, vehicles in particular, carry their own detailed numerical limits that are revised every year.
The stakes here run in both directions. A company that under claims legitimate deductions simply pays more tax than necessary, quietly eroding its margins year after year without the pattern always being obvious from the outside. A company that over claims, by treating personal or inadequately documented costs as business expenses, faces a different risk entirely: a tax inspection that disallows the deduction, reassesses the underlying tax base, and applies interest and penalties on top of the resulting shortfall. Getting this boundary right in both directions is what this guide sets out to help with.
To be deductible under Turkish law, expenses must be directly related to the income generating activities of the business. Article 39 of Türkiye's Income Tax Law No. 193 defines commercial income, under the cash basis accounting method used by many businesses, as the positive difference between revenues earned and expenses incurred within a fiscal year, income received in cash plus amounts accrued as receivable, less amounts paid out plus amounts accrued as payable.
The specific list of expenses a business is permitted to deduct from gross revenue in arriving at this figure is set out separately, in Article 40 of the same Law, across eleven distinct categories. This list is what practitioners commonly refer to as legally accepted expenses, and it is worth understanding as a defined, enumerated list rather than an open ended category, since an expense that does not fit within one of these categories, or that fails the underlying tests of being directly connected to the business, clearly documented, and reasonable in scale, generally cannot be deducted regardless of how it is otherwise justified internally.
Expenses include not only direct operational costs but also certain taxes and liabilities related to business functioning. For a broader picture of how companies are taxed in Türkiye, see our guide on taxation for companies in Turkey.
By documenting allowable expenses properly, companies in Türkiye can reduce their income tax burden, save on VAT payments where applicable, improve financial planning and budgeting, and strengthen their overall compliance with tax regulations. Properly categorised business expenses allow sole proprietorships and corporations alike to benefit from a lower taxable base, provided the underlying documentation genuinely supports the deduction claimed.
Understanding the monthly mandatory expenses of a company in Turkey also helps with planning which costs are recurring and predictably deductible, as opposed to one off or discretionary expenses that require closer individual justification each time they arise. A company that maps its recurring costs against the Article 40 categories at the start of a fiscal year, rather than reconstructing this analysis retroactively when preparing an annual return, generally finds it far easier to spot gaps in documentation while there is still time to correct them.
Businesses may deduct the cost of meals provided to employees, whether through in house catering, external providers, or meal cards. Payments made directly in cash to employees for meals require detailed accounting records and are generally subject to social security contributions in a way that in kind meal provision is not. Meal cards, by contrast, offer full tax advantages when used within the daily exemption amount set annually by the tax authorities and in accordance with current regulations, making them a commonly preferred structure for employers seeking to provide this benefit efficiently.
Wages, bonuses, commissions, and other forms of employee compensation are tax deductible. This includes holiday bonuses and certain in kind benefits provided as part of an employee's overall compensation. All such payments must be properly documented and structured in a way that aligns with both labour law and tax regulations in order to qualify for deduction; an informally paid bonus without proper payroll documentation risks being challenged even where the underlying payment was entirely genuine.
Transportation costs, including flights, bus tickets, and cargo shipping incurred for business purposes, can be declared as business expenses. The underlying travel must be directly related to the company's operations or business development activities, and supporting documentation, such as tickets, invoices, and a record of the business purpose of the trip, should be retained to support the deduction.
Expenses for uniforms or protective gear issued as permanent company property, for example items that are returned to the company upon an employee's exit rather than becoming the employee's personal property, are deductible. This is especially relevant for businesses operating in construction, manufacturing, or logistics, where protective equipment is both a genuine operational necessity and a significant recurring cost.
Phone, internet, electricity, water, and gas bills are deductible where they are registered in the business's own name. This point on registration matters considerably in practice: invoices must be issued in the company's name, not an individual employee's or owner's personal name, and supported by corresponding payment records, or the deduction can be challenged on the basis that the underlying utility contract does not clearly belong to the business.
Office rent and maintenance fees are common deductible costs, whether for a physical business location or a legally registered virtual office arrangement. Valid, properly executed lease contracts and invoices issued in the company's name are required to support this category of deduction.
Subscription based software, SaaS, marketing tools, and digital advertising expenditure used for business activities are considered deductible operational costs, provided they are well documented with invoices that clearly identify the business as the purchaser and the service as connected to its commercial activity.
Paper, printers, chairs, desks, and other supplies necessary for day to day operations qualify as deductible expenses. Companies should retain receipts or invoices for each item, since even relatively small individual purchases can add up to a meaningful deduction over a fiscal year, and gaps in this documentation are a common, avoidable source of disallowed expense during a tax inspection.
Legal, accounting, auditing, and management consulting fees are fully deductible where supported by valid service agreements and properly issued invoices. This category is generally treated favourably given how directly connected professional service costs typically are to the proper operation and compliance of the business itself.
Company owned or leased vehicles used for business activities may have their purchase, fuel, maintenance, and insurance costs deducted, either partially or fully depending on the vehicle type. For passenger vehicles specifically, Turkish tax law has imposed detailed numerical restrictions since a 2019 reform under Law No. 7194, amending Articles 40 and 68 of the Income Tax Law, and these specific figures are revised annually.
For 2026, the applicable figures, set out in the relevant annual General Communiqué on the Income Tax Law, are as follows: operating costs such as fuel, maintenance, insurance, and financing costs on a passenger vehicle are generally deductible up to 70 percent of the amount incurred; where a passenger vehicle is leased rather than owned, the monthly rental deductible as an expense is capped at 46,000 Turkish Lira, excluding VAT, per vehicle, with any amount above this treated as a non-deductible expense; special consumption tax and VAT paid on the purchase of a passenger vehicle can be expensed directly in the year of purchase up to a combined 1,200,000 Turkish Lira, with any excess added to the vehicle's cost basis and depreciated instead; and the depreciation base itself is capped at 1,380,000 Turkish Lira where the purchase taxes were expensed directly, or 2,600,000 Turkish Lira where those taxes were instead added to the vehicle's cost basis or where the vehicle was acquired second hand. Because these specific figures are revalued every year in line with Türkiye's official revaluation rate, a business relying on a figure from an earlier year risks materially understating or overstating its permitted deduction, and the current year's figures should always be confirmed before finalising vehicle related tax calculations.
Also read: Understanding company types in Turkey, which affects how your deductions, including these vehicle specific limitations, are structured and applied depending on your chosen entity type.
Companies often mistakenly attempt to deduct non-business related or inadequately documented expenses. Common disallowed deductions include personal meals or groceries unrelated to a genuine business purpose, vacation travel disguised as a business trip, expenses relating to a private vehicle used by an employee that has not been properly registered and structured as a business asset, bills not issued in the company's own name, and unreceipted or otherwise undocumented purchases.
A related and equally common mistake involves timing rather than eligibility: an expense that is genuinely deductible in principle can still be disallowed, or at least challenged, if it is recorded in the wrong fiscal period. Turkish tax practice generally applies the accrual principle, meaning an expense should be recognised in the period to which it actually relates, rather than the period in which it happens to be paid. A business that pays an invoice late, or that backdates an expense into an earlier, more favourable period, risks having that expense reclassified or disallowed on review, independent of whether the underlying cost was otherwise entirely legitimate.
Only expenses with a direct, demonstrable link to business operations, and backed by formal, properly issued documentation, are legally deductible under Turkish law. Attempting to deduct an expense that fails either of these tests does not simply risk that specific deduction being disallowed; it can also draw broader scrutiny to a company's overall expense practices during a tax inspection. If you want to reduce your overall tax liability further while remaining fully compliant, consider working with a professional tax service in Turkey that can help structure and document your expenses correctly from the outset.
Sole traders in Türkiye can deduct a variety of operational expenses similar in nature to those available to corporate taxpayers, including utility bills genuinely related to their business activity, rent and maintenance costs for a home office arrangement provided this is properly documented and proportionate to actual business use, fuel, parking, and car insurance, generally up to 70 percent where the vehicle is used for business purposes, consistent with the passenger vehicle restriction described in section 3.10 above, health insurance premiums and related healthcare costs, and legal or financial consulting fees connected to the business.
These deductions result in a lower taxable income for the sole trader, ultimately reducing their personal income tax obligation for the relevant year. Sole traders should be particularly careful to maintain a clear separation between genuinely business related expenses and personal spending, since the absence of a separate corporate legal entity makes this line somewhat easier to blur in practice, and correspondingly more likely to attract closer review during an inspection.
Article 39 of the Income Tax Law, Law No. 193, defines commercial income as the positive difference between revenue and expenses, while Article 40 of the same Law sets out the specific categories of expense that may be deducted from gross revenue.
Yes, whether provided through in house catering, an external provider, or meal cards, though meal cards used within the current annual exemption amount generally offer the most straightforward full tax advantage.
Not entirely. Passenger vehicle costs are subject to specific caps under Articles 40 and 68 of the Income Tax Law, including a 70 percent limit on operating costs, a monthly rental cap for leased vehicles, and separate caps on purchase tax expensing and depreciation, all revised annually.
The deduction can generally be challenged, since the underlying invoice needs to clearly show the business as the party responsible for the bill in order to support the expense claim.
No. Personal meals, vacation travel, and other clearly personal expenditure are disallowed even where paid through a business account, and attempting to deduct them can draw broader scrutiny during a tax inspection.
Largely yes, with the same underlying categories of deductible expense generally available, though sole traders should take particular care to separate personal and business spending given the absence of a distinct corporate legal entity.
Yes, professional services and consultancy fees, including legal, accounting, auditing, and management consulting costs, are fully deductible where supported by valid service agreements and properly issued invoices.
Generally only where it is issued as permanent company property, such as a uniform or protective gear that remains the company's asset and is returned upon an employee's departure, rather than becoming the employee's personal property.
Yes. The monthly rental cap, the purchase tax expensing limit, and the depreciation base caps are all revalued annually in line with Türkiye's official revaluation rate, so the current year's figures should always be confirmed before relying on them.
An invoice or receipt issued in the company's name, evidence of payment, and, where relevant, a supporting contract or agreement, sufficient to demonstrate both that the expense occurred and that it relates directly to the business.
Yes, subscription based software and other digital tools used for business activities are deductible operational costs provided they are properly invoiced and documented.
Generally yes, for rent and maintenance costs, provided the arrangement is properly documented and the claimed proportion reasonably reflects actual business use of the space.
Most deductible business expenses reduce the taxable income base for income or corporate tax purposes, while VAT paid on those same purchases can, separately, generally be offset against VAT collected on sales, provided the underlying invoice is properly issued and the expense itself is deductible in the first place.
No. Administrative fines, tax penalties, and similar sanctions are generally treated as non-deductible expenses regardless of how directly they relate to the business's operations, since they are not considered ordinary costs of generating income.
Understanding exactly which business expenses are deductible under Turkish law, and just as importantly, exactly how each category needs to be documented and, for vehicles in particular, numerically limited, is essential for any company or sole trader operating in Türkiye. The underlying framework under Articles 39 and 40 of the Income Tax Law rewards careful, consistent documentation and penalises expenses that cannot be clearly tied to genuine business activity, and the annually revised limits on categories such as passenger vehicle costs mean that even a well run finance function needs to revisit these figures every year rather than relying on what applied previously.
For guidance on structuring your business expenses correctly, confirming the current year's deduction limits, or reviewing your existing expense practices before a tax inspection arises, our team can help you build a compliant, well documented approach from the ground up.
