What is an Inheritance Agreement, and When is it Used?

1) What is an inheritance agreement? What is its purpose?

A testamentary agreement is a type of disposition binding on death in which a person expresses their will regarding how their assets will be transferred after their death, not through a unilateral declaration, but by agreement with the other party(ies) . In simple terms: the intention, "Let this result occur after my death," is formalized into a contract through the shared will of the parties.

The basic purpose of a testamentary agreement in practical life is this:

To reduce uncertainty after death,
potential conflicts within the family while they are still alive ,
To secure a win for a person with "contractual seriousness,"
The aim is to establish a "balance in advance" among heirs, especially through arrangements such as renunciation of inheritance

However, an inheritance agreement is not a "magic shield." In Turkish inheritance law, certain issues are restricted even if the parties agree: the reserved share regime, the reduction mechanism, grounds for annulment , and formal requirements are among these restrictions. Therefore, an inheritance agreement is a powerful yet "fragile" tool; if properly drafted, it can ensure inheritance peace, but if poorly drafted, it can escalate inheritance disputes.

2) Differences between a will and an inheritance agreement

There are two main tools in inheritance planning: a will and an inheritance agreement. Both take effect after death; however, the differences between them determine which is more appropriate in each situation.

2.1) Unilateral transaction – bilateral transaction

A willis a unilateral declaration of intent by the testator. The testator usually makes it alone and can often change it alone.
A testamentary contract , on the other hand, involves the element of "agreement." Therefore, the testator's subsequent unilateral revocation is much more limited and debatable compared to a will.

In practice, this difference boils down to this: if someone wants to give the other party a serious assurance of "I will leave this to you," a testamentary contract seems like a more effective tool. But if the testator anticipates a high probability of changing their mind in the future, a will often offers a more flexible solution.

2.2) Driving license and risk of disputes

The legal capacity requirements for inheritance agreements are stricter. This can make inheritance agreements more contested, especially in disputes involving advanced age, health problems, or claims of cognitive impairment. Therefore, if an inheritance agreement is to be made, the arrangement of evidence for the transaction date and its surroundings (health assessment, clear explanation of the terms of the transaction, proper selection of witnesses) should be planned in advance.

2.3) Formal requirements and procedural certainty

A testamentary agreement is a process requiring "formal procedure." It is conducted in the presence of a public official, two witnesses, and according to a specific procedure. This formality, on the one hand, increases its probative value; on the other hand, even a minor procedural error can lead to a dispute over its annulment years later.

2.4) Language of conflict

Wills primarily discuss "capacity, form, and defects of will." In inheritance agreements, in addition to these, concepts from contract law such as "contractual obligation," "counterperformance," "rescission," and "cancellation" are incorporated. This makes inheritance agreements both stronger and technically more complex.

3) Types of inheritance agreements

In practice, inheritance agreements can be grouped into two main categories: affirmative inheritance agreements and negative inheritance agreements.

3.1) Positive inheritance agreement (involving a transfer of property)

In such contracts, the testator arranges bequests that will take effect after death in favor of a person. Examples:

a person an heir (appointing an heir),
a specific property, vehicle, company share, or bank account to a specific person .
Establishing conditional entitlement (for example, completion of a specific educational process),
To impose an obligation (e.g., a maintenance obligation, payment of a specific debt).

The general purpose of these agreements is to clarify the issue of "who will get what" while the matter is still being resolved.

3.2) Negative inheritance agreement (renunciation of inheritance)

In practice, the first thing that comes to mind when talking about a negative inheritance agreement a waiver of inheritance agreement. In this case, the heir partially or completely relinquishes their future inheritance rights. Waiver is often used to maintain balance within the family.

Waiver is structured in two ways:

Unconditional renunciation: The person renouncing gives up without receiving any compensation.
Renunciation in return: The party renouncing the right to relinquish something receives something in return (money, real estate, company shares, assumption of debt, maintenance commitment, etc.).

Waiver for consideration is more common in practice because a compensation is often arranged to reduce the possibility of "my rights were violated later" disputes. However, waiver for consideration must also be written correctly; otherwise, it may open the door to objections such as "apparent sale/donation," "collusion," "excessive exploitation," and "inequity" in the future.

4) Agreement to renounce inheritance: Practical implications

A waiver of inheritance agreement, when used correctly, is one of the most effective tools for preventing inheritance disputes. However, it is important to understand the consequences

The person who renounces their inheritance loses their right to inherit.
If the scope of the waiver is unclear, a conflict of interpretation arises: "Is it a complete waiver or a partial waiver?"
In a relinquishment of value, if the nature of the consideration, when and how it will be fulfilled are not clearly stated, a dispute over "non-performance" may arise later.
Whether the waiver will have consequences for the descendants of the person relinquishing the right may vary depending on the wording of the contract. Therefore, the "status of the descendants" should be given special consideration in cases involving family matters.

Example: If the family business is to remain under a single owner, two siblings can relinquish their inheritance, and one sibling can take over. However, if the implications for the children of the relinquishing siblings are unclear, the company may become the subject of "indirect inheritance" disputes after death. Therefore, relinquishment agreements should clearly state "who will be affected.".

5) When is a probate agreement preferred? (Scenario-based explanation)

A testamentary agreement is not the right tool for every case. The following scenarios illustrate areas where a testamentary agreement is particularly preferred.

Scenario 1: Preventing the collapse of the family business

The distribution of company shares among heirs can paralyze management. A will agreement can be structured to appoint one person as heir or leave specific shares to them, while other heirs renounce their rights. The goal here is "business continuity." Keeping the company in the hands of a single individual sometimes means economic security for the entire family.

Scenario 2: Second marriage and mixed family structure

In second marriages, one side consists of the surviving spouse, and the other side consists of children from the previous marriage. This structure is highly susceptible to post-mortem disputes. Inheritance agreements, particularly those involving waivers and balancing mechanisms, can enhance family harmony. For example, children relinquishing certain assets in exchange for securing specific rights for the spouse.

Scenario 3: An heir receiving excessive support "while alive"

A testator may have provided significant support to one of their children, such as education, starting a business, or buying a house. Other heirs might argue after death that this is "unfair." A testamentary agreement ensures that this balance is documented during the testator's lifetime, reducing potential disputes.

Scenario 4: Care-based earnings

In some families, a child or relative provides care and dedication for many years. After death, the claim by other heirs that "everyone should receive an equal share" can lead to significant conflict. A testamentary agreement can clarify the caregiving relationship and the plan for transferring assets. However, an alternative institution, a "contract for care until death," should also be considered; the choice depends on the specific circumstances.

Scenario 5: Preventing the fragmentation of properties

If there are multiple properties and disputes over their distribution are anticipated among the heirs, the inheritance agreement clarifies the question of "which property belongs to whom." However, if the reserved share balance is not observed, further fragmentation may occur through reduction lawsuits after death. Therefore, the property plan should be established taking into account the calculation of the reserved share.

Scenario 6: Files with a high need for predictability

Some people want to protect a particular individual: a disabled child, a long-term partner, or a financially disadvantaged family member. A probate agreement can make planning for this person more "committed.".

Scenario 7: Risk of assets with foreign connections and mixed inheritance

If a portion of the deceased's assets are located abroad, or if the heirs live in foreign countries, post-death procedures become more complex. A testamentary agreement alone does not solve every problem, but it can facilitate the process by establishing a certain order for the transfer of assets in Türkiye.

Scenario 8: Documenting Family Reconciliation

Within a family, there is often an agreement; however, verbal agreements are often forgotten or denied years later. A probate agreement formalizes this agreement, reducing future disputes.

Scenario 9: The testator wants to make plans while retaining the freedom to make decisions "while alive"

Some people say, "I should be able to sell my property while I'm alive, but this balance should also be maintained after my death." A testamentary contract allows for this balance; however, if the text is not properly drafted, a dispute may arise claiming "the testator sold the property, rendering the contract void." Therefore, it may be necessary to include provisions such as substitute value and consideration in the contract.

Scenario 10: The goal is to prevent an inheritance dispute

The greatest "economic" benefit of an inheritance agreement is that it reduces the cost of lawsuits that can drag on for years. The cost of litigation isn't just court fees and attorneys' fees; indirect costs such as family breakdowns, business losses, idle real estate, and delayed sales can be far greater. Therefore, the motivation to "avoid conflict" makes an inheritance agreement a strong option.

When should it be avoided?

If the testator frequently changes their mind,
If family dynamics are very volatile and the ground for compromise is weak,
If the driver's license dispute is high-risk and a basis for providing evidence cannot be established,
If the reserved share balance cannot be achieved,
If it is foreseen that the parties will not act in accordance with contractual discipline,
more flexible instruments may be preferred instead of a testamentary agreement.

6) Validity requirements: form, license, witnesses, procedure

In inheritance agreements, "procedure" is as important as "content." This is because annulment lawsuits often proceed based on the trio of "form, capacity, and witnesses.".

6.1) Formal requirements

A testamentary agreement is drawn up through official procedures. In practice, this is usually done at a notary public's office. In the establishment of the transaction:

The parties submit their statements in the presence of an official
The text is prepared in accordance with official procedure
Witnesses are duly present,
The signatures are affixed in the correct order.

Completing the process "quickly" increases procedural risk. A probate agreement is not a process that should be rushed; a small procedural error can come back as a claim for annulment years later.

6.2) Driving license requirement

The person entering into a testamentary agreement must be of sound mind, of legal age, and not under any legal restrictions. These conditions become particularly critical in the following cases:

Old age,
Hospital history,
Drug use,
The claim of a psychiatric disorder,
Situations where family conflict is high.

In cases like these, measures taken to minimize “qualification” disputes around the time of the transaction (e.g., medical evaluation, clear explanation of the contract contents, selection of witnesses) will make a big difference later on.

6.3) Witnesses and prohibitions on testifying

In formal legal proceedings, factors such as the identity of the witnesses, their relationship to the parties, and their literacy are crucial. A common mistake in practice is "calling a family member to be a witness." However, in inheritance law, close family relationships can pose a serious risk in witness selection. Witnesses must be completely independent and comply with legal procedures, as this weakens any future claims for annulment.

6.4) Special cases such as language, literacy, and signature issues

If one of the parties is illiterate, has a disability, or does not speak Turkish, the transaction requires special attention. In such cases, issues such as interpreting, the obligation to explain, and the signature procedure become vital for transaction security. The claim of "failure to understand" is a typical argument in cancellation lawsuits; therefore, the language and wording of the contract should be considered from the outset.

7) The effect of it being a "contract": binding nature and limitations

A testamentary agreement is more binding than a will; however, it is important to understand this binding nature correctly.

7.1) What does binding mean?

Binding nature does not mean that the testator must strictly adhere to the contract under all circumstances. Binding nature primarily means the following:

Winning isn't about "one-sided whim," but about a will that builds trust with the other party as well.
It is not always easy for the testator to arbitrarily terminate a contract.
The other party's expectations arising from the contract also appear more "serious" in the legal system.

7.2) Boundaries

However, the inheritance agreement is subject to the following limitations:

Reserved share: Some heirs have a protected share.
Reduction: If the reserved share is violated, the inheritance may be reduced.
Reasons for annulment: Situations such as lack of legal capacity, defects of will, illegality/immorality, and physical defects may result in annulment.

7.3) What happens if the testator sells their property during their lifetime?

A very practical question: “I leave this property in the inheritance agreement, but what if I later sell that property?”
In this case, the dispute depends on the content of the agreement. If the agreement is based solely on “this property” and the property has been disposed of, then the de facto nullification of the agreement becomes debatable. Therefore, for a safe formulation, the following points should be considered in the text:

If the goods subject to the contract are disposed of, a replacement value (substitute price) be left behind?
What will happen to the new goods purchased with the proceeds of the sale?
the other party to compensation/compensation ?

Such provisions make the inheritance agreement more resilient to the "course of life.".

8) Hidden share – reduction risk: how to create the right structure?

One of the most critical technical issues when preparing a testamentary agreement is the reserved share and the associated of reduction . Because, no matter what agreements the testator makes, the reserved share regime protects certain heirs.

8.1) Why is the reserved share important?

It is not easy to completely exclude heirs entitled to a reserved share from the testator's dispositions. The testator has a portion that they can freely dispose of; dispositions exceeding this portion can be reduced through a post-death reduction lawsuit.

8.2) Does reduction “ruin everything”?

No. Reduction often means a certain degree of reduction ." However, in practice, reduction can weaken the backbone of the plan: especially in plans based on a single property, a reduction decision can lead to consequences such as the property being converted into a partnership.

8.3) Recommendations for safe editing

To realistically inventory the deceased's assets and liabilities,
To calculate the disposable portion based on reserved shares of heirs and their respective percentages
Instead of concentrating earnings in a single asset, spreading them across different asset classes when necessary,
Reducing the risk of reserved shares through waiver/compensation mechanisms,
Especially in family businesses, it's important to establish a good balance between equity, cash, and real estate.

In summary: Inheritance agreements are secured not by "intent," but by calculation

9) Grounds for cancellation and litigation strategy (general framework)

Inheritance agreements can be subject to annulment lawsuits. Grounds for annulment generally fall into the following groups:

Claim of incompetence: The claim is that the driver lacked/had impaired capacity to make reasoned judgments.
Defective will: Claims such as error, deception, or intimidation.
Irregularities: Allegations of non-compliance with official procedures, unsuitable witnesses, and procedural deficiencies.
Unlawful or immoral: The content of the contract exceeds legal boundaries.

There are two critical facts from a legal strategy perspective:

In annulment cases, the events often revolve around "the day the transaction took place." Health conditions on that day, the environment, the relationship between the parties, the qualifications of the witnesses, and the clarity of the statements all influence the outcome of the case.
The "form" claim is often the quickest and most technical claim. Therefore, ensuring procedural certainty from the outset when the contract is formed can end a lawsuit before it even begins.

10) Termination of inheritance agreements: cancellation, rescission, invalidation

A testamentary agreement is not always "unchangeable until death." There are ways to terminate it; however, these are not as flexible as in a will.

10.1) Removal by agreement of the parties

The parties can terminate the inheritance agreement through a written consent. This is practically the safest way: if both parties waive their rights, they terminate it together.

10.2) Unilateral nullification upon fulfillment of specific conditions

In some cases, the testator may be able to unilaterally terminate the contract. The fate of the contract becomes questionable, especially if the other party has engaged in conduct that severely damages the inheritance relationship, or if the relationship of trust between the testator and the other party has fundamentally collapsed.

10.3) Non-performance and withdrawal of the counter-obligation

In reciprocal contracts, discussions about rescission/termination of the contract arise if the other party fails to fulfill their obligation. Therefore, the "performance-term-default-warning-rescission" structure in reciprocal inheritance contracts should be rewritten from the outset.

10.4) The beneficiary dies before the testator

If the beneficiary of the contract dies before the testator, the fate of the contract's provisions relating to them will be evaluated separately. "Substitute beneficiary" or "replacement" arrangements can be planned for such risks.

11) Common mistakes in practice and safe transaction checklist

11.1) The most common mistakes

Inappropriate selection of witnesses (close relatives, dependent relationships, literacy problems)
Leaving the text ambiguous (using vague expressions such as "I am leaving this property")
The "leaving everything to one person" mentality without establishing a balance of reserved shares
In a relinquishment with consideration, the consideration is not clearly stated (what, when, how?)
No special arrangements are established for company shares (share transfer, valuation, management)
The question "What happens if the goods are sold?" is not addressed at all in the text
Driving license dispute: Lack of established evidence infrastructure in high-profile case

11.2) Secure transaction checklist (pre-notary)

12) Frequently Asked Questions (FAQ)

1) Which is "stronger": a testamentary contract or a will?
A testamentary contract is stronger in terms of "guaranteeing financial consequences"; however, due to reserved shares and grounds for annulment, neither instrument is absolute.

2) Can everything be left to one person through a testamentary agreement?
If there are heirs with reserved shares, a plan to "leave everything to one person" increases the risk of reduction of the inheritance after death. Most cases require a more balanced structure.

3) Is renunciation of inheritance always a solution?
No. Renunciation, especially if it involves compensation, can lead to a bigger lawsuit later if not written correctly. But if properly structured, it is a very effective means of reconciliation.

4) Can the testator sell their property after making a testamentary agreement?
Generally, the testator can dispose of their property during their lifetime. However, if the purpose of the agreement is not fulfilled, disputes such as breach of contract and compensation may arise. Therefore, the "disposal" scenario should be managed in the text.

5) Can a testamentary agreement be annulled?
Claims of annulment may arise due to reasons such as legal capacity, defects in consent, or formal flaws. Therefore, procedural certainty is crucial when establishing the agreement.

6) Can a care relationship be regulated by an inheritance agreement?
Yes, it can; however, in some cases, a "care agreement until death" may be a more suitable instrument. The choice is made according to the specific circumstances.

7) Can company shares be regulated in a will?
Yes, but issues such as the company agreement, restrictions on share transfer, valuation, and continuity of management must be considered together.

8) Is it necessary to write down a substitute heir/alternative beneficiary?
Most of the time, yes. Because risks such as the beneficiary dying before the testator can render the plan invalid.

9) What happens if a new child is born after a will is signed?
Changes in family structure (new child, marriage, divorce, etc.) can affect the balance of reserved shares and the plan. Therefore, periodic review of the plan is important.

10) Is an inheritance agreement a "definitive solution"?
Rather than claiming it's a definitive solution, it's more accurate to call it a "strong plan that mitigates risks." Because every plan can be tested against reserved shares and cancellation mechanisms.

13) Conclusion: In which case is the inheritance agreement the correct tool?

Inheritance agreements generate significant value, especially in scenarios where a compromise is possible , an asset plan can be calculated , and situations involving family businesses, mixed families, or renunciations of assets occur. With the right structure:

It makes the distribution of inheritance predictable
It reduces domestic conflicts
It prevents business and asset losses.

But one fact must not be forgotten: a testamentary agreement is not just a matter of "writing a text," risk management . If the form, witnesses, and qualifications are not sound, even the best-intentioned plan can be challenged in court. If the balance of reserved shares is not established, even the most ambitious arrangement can be reduced through a reduction. Therefore, if a testamentary agreement is to be made, the procedure should be planned as meticulously as the content.

Legal Consultancy, Istanbul Lawyer, Inheritance Law, inheritance agreement, rejection of inheritance, Supreme Court decisions

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