How marriage and cohabitation differ in terms of retirement provision

Whether you are married or living with a partner: The type of relationship doesn't change the feelings we have for each other. However, it makes a big difference when it comes to financial planning – for example, regarding inheritance, OASI and pension funds or in the event of death. Therefore, identify where pension gaps may arise—and take the necessary steps to safeguard your relationship accordingly.

Marriage and cohabitation: a brief explanation

Cohabitation
A cohabitation refers to a situation in which a couple lives together without being married. It offers a lot of flexibility and independence, but it also means that couples have to handle more things on their own. 

Marriage
A marriage is defined as the legal union of two people via a civil ceremony. Marriage automatically gives rise to certain rights and obligations, such as those related to mutual support, property, inheritance and financial planning.

Good to Know: Registered partnership

As of July 1, 2022, no new registered partnerships may be entered into in Switzerland. Existing partnerships remain valid or can be converted into a marriage.

What is the difference between marriage and cohabitation?

Whether marriage or cohabitation: One's chosen lifestyle has a direct impact on retirement provision, inheritance law and financial security. The differences become particularly clear in the event of a separation, incapacity or death. Unmarried couples must therefore handle certain matters on their own that marriage would otherwise regulate by law.

Topic Marriage Cohabitation
Legal framework
Many rights and obligations apply automatically, such as those related to inheritance, matrimonial property regimes and mutual support.
There is no comprehensive legal protection for the couple.
Assets in the event of separation
In the absence of a marital agreement, the participation-in-acquired-property regime applies. As a general rule, everything acquired jointly during the marriage is considered marital property. Only personal property is not considered acquired property. Pension benefits accrued during the marriage are generally divided in the event of a divorce.
Property and assets generally remain with the person to whom they legally belong. There is no automatic division of pension fund assets, nor is there a general right to spousal support.
Taxes
Married couples and existing registered partnerships are now taxed jointly. The individual taxation system, adopted in 2026, will take effect no later than 2032.
Unmarried individuals are taxed separately. Depending on your income, whether you have children and the canton where you live, this may be more or less favorable.
OASI retirement pension
Both individuals will receive their own pension. However, for married couples, the total of the two pensions is capped at 150% of the maximum single pension.
Both individuals receive their own individual pension: That adds up to 200%.
OASI in the event of death
Under certain conditions, the surviving spouse is entitled to a widow's or widower's pension. Children are entitled to an orphan's pension upon the death of a parent.
Cohabiting partners are not eligible for an OASI widow's or widower's pension. Children are also entitled to an orphan's pension upon death of a parent.
Pension fund There are statutory minimum benefits for spouses, provided the requirements are met. The regulations may provide for additional benefits. A benefit is payable only if the pension fund’s regulations provide for it and the required conditions are met. A written registration is often required.
Inheritance law Ehegatten gehören zur gesetzlichen Erbfolge und sind pflichtteilsgeschützt.
Common-law partners are not legal heirs. Without a will or an inheritance agreement, they will receive nothing from the estate.
Pillars 3a and 3b
Spouses and registered partners are the first in line in the order of beneficiaries for pillar 3a. Under pillar 3a, tax benefits are available only within the limits set by law. Under pillar 3b, it can be structured more flexibly.
Homeownership
Inheritance law and matrimonial property law provide greater protection for the surviving spouse. Nevertheless, the affordability of the mortgage must be ensured.
The key factors are the land registry entry, financing and estate planning. Without a plan in place, the surviving spouse may lose the family home or be required to pay out to heirs.

Pension gaps for cohabiting couples at a glance

People living in a common-law relationship are not protected in the same way as married couples in all areas of retirement provision and financial security: 

  • OASI: If a person dies, the surviving spouse is not entitled to a widow's or widower's pension.
  • Pension fund: Benefits depend on the rules of the respective pension fund and, in some cases, must be applied for or reported in advance.
  • Inheritance law: Cohabiting partners do not automatically inherit. In the absence of a will or an inheritance agreement, the estate passes to the statutory heirs.
  • Separation: Pension fund balances and assets are not automatically divided. People who work fewer hours because of children or household responsibilities therefore face an additional financial risk.
  • Homeownership: Without clear provisions, the surviving spouse may have to pay out the heirs or may no longer be able to cover the mortgage on their own.
  • Disability: If there is a prolonged loss of income, there is no legal obligation to provide support in a common-law relationship, as there is in marriage.

What documents are important for couples?

Retirement planning isn't just about OASI, pension funds and private insurance. Depending on your living situation, it may also be a good idea to set out important legal matters in writing. This is especially true in cohabiting relationships, because many rights do not arise automatically. However, married couples can also use a will, a power of attorney for healthcare or a living will to specify in greater detail what should apply in certain situations.

  • Cohabitation agreement: Addresses issues related to living together and financial matters, such as living expenses, property, homeownership, debt or agreements regarding a separation.
  • Will or inheritance agreement: Determines how the estate will be distributed. This is particularly important for unmarried couples, because the partner does not automatically inherit.
  • Advance care directive: Determines who will take charge of a person's personal, financial and legal affairs if that person becomes incapacitated.
  • Advance health care directive: Specifies which medical treatments are desired or refused and who should represent the individual's interests in dealings with doctors.
  • Declarations of beneficiary status: Identify who is covered by the pension fund as well as under pillars 3a and 3b – to the extent permitted by law and the regulations.

Advance care directive and living will

Take steps to ensure that your wishes are respected even if you are no longer able to express them yourself.
Find out more

Here's how cohabiting couples can protect themselves

Many gaps in cohabitation can be closed, at least in part, with the right precautions. It is crucial to review benefits and entitlements and to address important financial and legal issues early on.

Check benefits from OASI and the pension fund

There is no OASI survivor's pension for cohabiting partners. With regard to the pension fund, coverage depends on the specific regulations. Therefore, check with both pension funds to see what benefits are available and whether your spouse must be registered in writing.

When it comes to private retirement provision, it’s also worth taking a look at the beneficiary provisions. pillar 3a is subject to legal requirements, while pillar 3b offers more flexibility.

Retirement provision with pillars 3a and 3b

Tailor your personal retirement plan to fit your life situation.
Find out more

Protecting your partner and homeownership in the event of death

Cohabiting partners do not automatically inherit. With a will or an inheritance agreement, you can determine how your partner will be provided for within the limits of the law.

Particularly when it comes to homeownership, it should also be clarified whether the surviving person can assume the mortgage and pay out any heirs.

Men from several generations plant a tree together.

Risk life Insurance
Provide financial security for your partner in the event of your death.

Settling the financial consequences of a separation

People who work fewer hours to care for children or manage household duties often accumulate less income and pension plan savings. In a cohabitation, there is no automatic division of pension fund assets in the event of a separation.

With a cohabitation agreement, couples can, for example, set forth how expenses, assets, homeownership or financial compensation will be handled.

Protecting your Income in the event of disability

If you lose income for an extended period due to illness or an accident, your household budget can quickly come under strain. Find out what benefits you can expect from disability insurance (IV) and your pension fund and how large any remaining income gap would be.

Man standing behind bar talking on phone

Protecting against disability
Protect your income if you are unable to work – or can only work part-time – for an extended period due to illness or an accident.

How well are you protected as a couple?

How much money will you actually have available in retirement, in the event of long-term disability or in the event of a death? A retirement provision analysis shows what benefits you can expect, how much you'll need financially and where gaps may arise. Together, we'll determine where additional protection makes sense and which solutions are right for you.

Cohabitation info sheet

What pension gaps can arise when living together as a couple—and what specific arrangements can couples make? The info sheet provides a concise summary of the key points.

Download the info sheet

FAQ: Marriage and cohabitation

Why do unmarried couples more often face pension gaps than married couples?

Married couples are legally protected in many areas. Cohabiting partners, on the other hand, have to make more arrangements on their own – especially when it comes to inheritance and survivor benefits. For example, there is no OASI widow’s or widower’s pension for cohabiting partners. With regard to the pension fund, benefits depend on the applicable regulations.

What is the most important difference between marriage and cohabitation?

Marriage gives rise to legal rights and obligations, such as those related to inheritance, property, mutual support and financial planning. In a cohabitation, many of these issues are not automatically addressed. This gives couples more flexibility, but they have to take greater responsibility for organizing their own coverage.

What role does the type of partnership play in the OASI, pension fund and pillar 3a?

Under the OASI, cohabiting partners are not eligible for a widow's or widower's pension. Life partners may receive benefits from the pension fund if the regulations provide for this and the relevant requirements are met. In the case of pillar 3a as well, the statutory order of beneficiaries determines who is or may be eligible to receive benefits in the event of death.

At what point is a couple considered to be living together as common-law partners?

There is no fixed statutory deadline. A couple that is neither married nor in a registered partnership is generally considered an unmarried couple. However, a specific duration may be relevant for certain pension benefits: In occupational pension plans, for example, having lived together for five years may be a requirement for designation as a beneficiary.

What are the advantages of cohabitation over marriage?

Cohabitation offers couples more freedom to manage their financial and legal affairs on their own terms. Here, the rules on OASI and taxation differ from those for married couples. At the same time, various legal entitlements are lacking, such as those related to inheritance and OASI survivor benefits.

With professional support from

>Peter Spycher

Peter Spycher

Specialist in Retirement Provision and Investment Advice