What a divorce settlement agreement is and why it is the most important document in your divorce

When a couple with children decides to separate -- whether married or in an unmarried partnership -- there is one document that will shape their daily lives for years to come: the divorce settlement agreement (in Spain, the *convenio regulador*). This is the agreement both parents sign to govern the consequences of their divorce or separation, covering everything from child custody to the division of assets, child support, use of the family home, and the management of shared expenses.

In Spain, the settlement agreement is a mandatory requirement in uncontested divorces and express divorces, as established by Article 90 of the Civil Code (Código Civil). It can also be submitted in contested proceedings as a proposal by either party, although in that case the judge will decide whether to approve it, modify it, or replace it with whatever measures they consider most appropriate.

The importance of this document can hardly be overstated. A well-drafted agreement reduces future conflict, protects the rights of the children, and provides a clear framework for co-parenting. A vague or poorly negotiated agreement, on the other hand, becomes a permanent source of disputes that end up in court. According to data from the Consejo General del Poder Judicial, a significant proportion of applications to modify court-ordered measures stem from settlement agreements that left too many loose ends.

This article takes you step by step through everything you need to know: what the agreement must contain, how to draft it so that it actually works in practice, how to negotiate it constructively, when and how to amend it, and what tools can help you put it into practice day to day.

A divorce settlement agreement is not a routine piece of paperwork. It is the document that will govern your family life for years. Invest the time needed to get it right -- every ambiguous clause you leave today is a conflict you will face tomorrow.

Mandatory content of the settlement agreement

Article 90 of the Civil Code sets out the minimum content that every settlement agreement must include. However, the legal minimum is not always the practical minimum. Below, we break down each section with what the law requires and what is worth adding to avoid problems down the line.

Custody and visitation arrangements

This is the heart of the agreement when there are minor children. It must specify:

Type of custody: shared or sole. If shared, the agreement must detail the rotation schedule (alternating weeks, a 2-2-3 arrangement, etc.) and explain why this arrangement is considered most beneficial for the children. In Spain, shared custody is awarded in more than 43% of divorce rulings involving minor children, according to the INE (Instituto Nacional de Estadística).
Detailed calendar: Stating "alternating weeks" is not enough. A good agreement specifies the exact day and time of each handover, who picks up and who drops off, and the handover location. It must also cover the division of school holidays (Christmas, Easter, summer), long weekends, public holidays, the children's birthdays, and the parents' own birthdays. For guidance on designing a workable calendar, see our article on shared custody calendars.
Visitation arrangements for the non-custodial parent (in sole custody): weekdays, alternating weekends, specific times, and the pick-up location.
Communication with the absent parent: the child's right to phone or video call the parent they are not currently with, including a reasonable frequency and time window.
Rules on travel and relocation: consent required for international travel, obligation to notify the other parent of any change of address, maximum distance between the two homes.

The family home

The agreement must resolve the use of the family home -- a topic that generates a great deal of conflict. The most common options are:

Allocation to the custodial parent (or the parent who has custody for the majority of the time): the most common arrangement in sole custody situations, with the aim of preserving stability for the child.
Alternating use tied to the custody schedule (the "bird's nest" arrangement): the children always remain in the same home and the parents rotate in and out. This works well in theory but tends to create practical and financial complications over time.
Sale of the property and division of proceeds: if neither party can sustain the mortgage or running costs, the property is sold and the proceeds divided in accordance with the matrimonial property regime.
Temporary allocation with a fixed end date: a period of use is set (for example, until the child reaches the age of majority, or until the occupying parent has re-established their financial position), after which the property is sold or the arrangement changes.

The agreement should be as specific as possible: who pays the mortgage, who covers the community fees, insurance, property tax (IBI), and repairs, and what happens if the parent occupying the home begins living with a new partner.

Child support

Child support covers the children's ordinary living expenses: food, housing, clothing, education, and basic healthcare. The agreement must establish:

Monthly amount per child, calculated on the basis of the child's needs and each parent's financial capacity.
Payment method and date: bank transfer, direct debit, standing order. Specifying the exact day of the month prevents arguments.
Indexation clause: the standard practice is to link the amount to the annual CPI published by the INE, though other review mechanisms may also be agreed.
Duration: the obligation does not end automatically at age 18. The Civil Code provides that support continues for as long as the child lacks financial independence through no fault of their own. In practice, this includes the years spent in university or vocational training.
What the support covers: clearly specifying which expenses are included in the support payment significantly reduces disputes about shared child expenses.

In shared custody arrangements where both parents have similar incomes, it is common for no formal child support payment to be set; instead, each parent covers ordinary expenses during their own time with the children, and a joint account is established for fixed costs such as school fees, health insurance, and extracurricular activities.

Spousal support

When divorce creates a financial imbalance between the spouses, the one left in the worse position may be entitled to spousal support. The agreement must establish:

Amount and frequency: payments may be monthly or a lump sum.
Duration: fixed-term (the most common arrangement) or indefinite in cases of long marriages where one spouse gave up their career.
Grounds for termination: typically, a material improvement in the recipient's financial situation, their remarriage, or their entering into a new cohabiting relationship.

It is important not to confuse spousal support (between the former spouses) with child support (for the children). They have different legal natures and are governed by different criteria.

Extraordinary expenses

This is one of the sections that generates the most conflict when not drafted carefully. The agreement should address:

A clear definition of what constitutes an extraordinary expense in the context of your family.
A distinction between necessary and non-necessary expenses, with specific examples where possible.
The cost-sharing ratio: typically 50/50, but this may vary depending on each parent's income.
An approval procedure for non-necessary expenses: how a request is made, through which channel, the response deadline, and what happens if there is no response.
Required documentation: invoices, quotes, medical or school reports supporting the expense.

Drafting this section in detail is an investment that saves a great deal of frustration. If you want to explore this further, our article on extraordinary child expenses covers the topic in depth.

How to draft a good settlement agreement

Knowing the mandatory content is the first step. The second is drafting it in a way that actually works in practice. An agreement can be legally sound and, at the same time, completely useless if its clauses are so vague that they allow contradictory interpretations.

Be specific, not generic

The difference between an agreement that works and one that generates conflict lies in the level of detail. Compare these two examples:

Vague: "The parents will divide the summer holidays equitably."
Specific: "The summer holidays will be divided into two equal periods. In even-numbered years, the father will have the first two weeks of July and the first two weeks of August; the mother will have the last two weeks of July and the last two weeks of August. In odd-numbered years, the order will be reversed. Each parent will inform the other of the holiday destination and contact details at least 15 days before the period begins."

The second version leaves no room for interpretation. It is longer, yes, but every word saves a future argument.

Anticipate likely scenarios

A good agreement does not only govern the present -- it anticipates situations that are likely to arise in the future:

Change of school: who decides if the child changes schools and how disagreements are handled.
Relocation of one parent: what happens to the custody arrangement if one parent moves to another city.
New partners: rules about introducing new partners to the children and any eventual cohabitation.
Adolescence: how the schedule adapts as the children grow older and develop their own social lives.
Digital communication: rules on mobile phone use, social media, and video calls between the children and the absent parent.

You cannot anticipate everything, but addressing the most common scenarios significantly reduces the likelihood of ending up in court seeking a modification of the court order.

Include review clauses

Circumstances change: children grow up, incomes fluctuate, needs evolve. A thoughtfully drafted agreement includes clauses that allow for adaptation:

Periodic review: agree that every two or three years both parents will review the agreement and assess whether any aspect needs to be updated.
Dispute resolution mechanism: before going to court, commit to attempting to resolve disagreements through family mediation.
Automatic updates: beyond CPI indexation for child support, consider updating other aspects such as the threshold for extraordinary expenses that do not require prior consultation.

Negotiation: how to reach an agreement

A settlement agreement is, above all, an agreement -- and an agreement requires negotiation. The way you negotiate will shape not only the content of the document but also the tone of your co-parenting relationship in the years ahead.

Mediation as a negotiation tool

If direct conversations stall or turn into arguments, family mediation is the most effective alternative before resorting to litigation. A professional mediator helps you structure the negotiation, manage emotions, and find solutions that work for both parties.

According to data from the Consejo General del Poder Judicial, between 60 and 70% of couples who begin family mediation manage to reach an agreement. The average cost of a full mediation process in Spain ranges from 800 to 2,500 euros, compared with the 3,000--10,000 euros per person that a contested divorce can cost. The difference is significant -- in money, time, and emotional toll.

Collaborative law

Collaborative law is a form of negotiation in which each party has their own lawyer, but all parties commit in writing to reaching an agreement without going to court. If negotiations break down, both lawyers must withdraw from the case and the parties must hire new lawyers for any litigation. This mechanism creates a powerful incentive for everyone involved to work in good faith toward an agreement.

In Spain, collaborative law is gaining ground steadily, with associations such as the Asociación de Práctica Colaborativa de España (APCE) training professionals and promoting this methodology. It is particularly useful when there are complex assets or tax issues that require specialist legal advice during the negotiation itself.

Practical tips for negotiating more effectively

Separate the person from the problem: your former partner is your co-parent. Treat the negotiation as a business arrangement between partners, not a personal battle.
Put the children's interests first: before each round of negotiation, ask yourself "what is best for my children" rather than "how can I win". Judges place particular value on this attitude if the agreement is ever reviewed by a court.
Prepare objective data: actual income, documented expenses, working hours, distances between homes. The more objective information you bring to the table, the less room there is for emotional argument.
Do not negotiate when emotions are running high: if a negotiation session becomes tense, ask for a break. Decisions made in anger are rarely good ones.
Think long-term: an agreement that seems favorable today may be unsustainable in three years. Look for balanced solutions that both of you can maintain over time.
Document each partial agreement: as you close each point, put it in writing. That way, what has already been agreed cannot be reopened.

Modifying the settlement agreement

A settlement agreement is not set in stone. Spanish law allows it to be modified when there has been a material change in the circumstances that existed when it was approved. This matters because lives change: children grow, employment situations shift, new needs arise.

When a modification is possible

Article 90.3 of the Civil Code allows an application to modify the agreement when the circumstances have materially changed. Case law has clarified what constitutes a material change:

Significant change in income: job loss, a substantial promotion, starting or closing a business. The change must be meaningful and not merely temporary.
Change of residence: when one parent moves to another city, the custody and visitation arrangement may need a complete overhaul.
New needs of the children: a medical diagnosis, the start of a new stage of education, or special needs that did not exist when the agreement was signed.
Changes in the children's age and maturity: a schedule that worked for a 4-year-old may not be suitable for a 14-year-old teenager.
Repeated non-compliance: if one parent consistently fails to comply with the agreement, the other may apply for a modification that includes more concrete provisions or enforcement measures. For these situations, see our guide on breach of the settlement agreement.

How the modification process works

If both parents agree on the modification, the process is relatively straightforward: a new agreement is drafted setting out the changes, it is filed with the court along with a joint application for modification, and the judge approves it if they consider it does not harm the children.

If there is no agreement, the parent seeking the modification must file a contested application, providing evidence of the material change in circumstances. In such cases, the process is longer and more costly, and the outcome will depend on the judge's assessment.

Before going to court, it is always advisable to try mediation first. Many modifications that seem impossible to agree on are resolved with the help of a professional mediator within a matter of weeks, avoiding court proceedings that can drag on for months.

How technology helps you comply with the agreement

Signing a good settlement agreement is essential -- but just as important is following through on it day to day. This is where many families run into trouble. An agreement may run to 20 pages of detailed provisions, but if there is no practical system for implementing them, good intentions dissolve in the chaos of everyday life.

Think about everything a typical agreement covers: a custody calendar with dozens of dates, an expense-sharing system with categories and percentages, communication rules, notification deadlines. Managing all of this through WhatsApp messages, spreadsheets, and mobile phone notes is a recipe for misunderstandings and arguments.

Co-parenting apps like Niddo are designed precisely to translate the provisions of an agreement into a practical tool that both parents use every day. A digital shared custody calendar that reflects exactly the agreed schedule, an expense module where every payment is logged with supporting documentation, and a child-focused communication channel that keeps a written record of everything. When agreements are visible, measurable, and trackable, compliance stops being a matter of goodwill and becomes a habit.

Beyond that, if a dispute arises about whether the agreement is being followed, having a complete digital record is valuable documentary evidence that courts take seriously. Several family courts in Spain already admit records from co-parenting apps as supplementary evidence in proceedings to modify court-ordered measures or to address non-compliance.

A well-drafted settlement agreement is only half the work. The other half is following through on it every day. Digital tools turn agreements on paper into manageable, verifiable routines.

Conclusion: your settlement agreement as the foundation of effective co-parenting

A divorce settlement agreement is far more than a legal document. It is the founding agreement of your new family structure. Its quality determines, to a large extent, whether co-parenting runs smoothly or becomes a constant source of conflict that ultimately affects the people who matter most: the children.

Invest the time to draft it well. Be specific in every clause. Anticipate the most likely future scenarios. Negotiate with a focus on the long term and on the best interests of the children. And once it is signed, put the right systems in place to follow through: a reliable calendar, a transparent expense-tracking system, and orderly communication.

If you are at the start of a separation, give serious consideration to family mediation as a way to negotiate the agreement. If you already have an agreement and feel it is not working, remember that the law allows you to modify it when circumstances change. And if you need a tool to help you put your agreements into practice every day, technology is on your side.

Download Niddo for free and build your co-parenting on a solid foundation -- because a settlement agreement only fulfills its purpose when it translates into concrete actions, every single day.

Divorce settlement agreement: what it must include and how to negotiate it