In Sweden, marriage automatically creates a shared financial system. Under the Marriage Code (Äktenskapsbalken 1987:230), almost everything each spouse owns becomes "marital property" (giftorättsgods) the moment you marry. This does not mean you co-own each other's things during the marriage, but it does mean that if the marriage ends, through divorce or death, the combined net value of all marital property is split in half between the two of you, regardless of who bought what or whose name is on it.
A prenuptial agreement (äktenskapsförord) is the legal tool that changes this default. By signing one, you can convert specified assets, or all of your assets, into "separate property" (enskild egendom), which stays out of the 50/50 split. It can be signed before the wedding or at any point during the marriage, and it can also be reversed later by a new agreement.
This guide explains, in plain English and under current Swedish law, what an äktenskapsförord actually does, when internationals living in Sweden should consider one, the exact legal requirements (including registration with the Swedish Tax Agency), and the mistakes that most often make these agreements fail. It keeps the Swedish terms in parentheses so you can match them against official documents.
What is a prenuptial agreement (äktenskapsförord)?
An äktenskapsförord is a written contract between spouses, or people about to marry, that decides whether their property is "marital property" (giftorättsgods) or "separate property" (enskild egendom). The distinction matters only when the marriage is dissolved by divorce or death, because that is when a property division (bodelning) takes place. The starting point in Swedish law is set out in Chapter 7, Section 1 of the Marriage Code: all of a spouse's property is marital property unless it has been made separate property. Marital property is what gets divided equally in a bodelning. Separate property is kept out of that division and stays with its owner. A prenup is the main way to turn an asset into separate property; the others are gifts and inheritances that come with a written condition that they be the recipient's separate property. Importantly, an äktenskapsförord is purely about how property is divided, not about who owns or controls things during the marriage. Each spouse still owns, manages and is responsible for the debts on their own assets throughout the marriage, with or without a prenup. The agreement only takes on practical effect at the moment of bodelning.
When is an äktenskapsförord needed?
A prenup is never legally required to marry in Sweden, and many couples never sign one. It becomes worth considering when the automatic 50/50 split would produce a result you do not want. Common situations include: one partner brings significantly more assets into the marriage (savings, property, shares); one runs a company and wants to shield the business from being split or valued in a divorce; one expects or has received an inheritance or gift and wants to keep it separate; there are children from a previous relationship whose future inheritance you want to protect; or simply both partners prefer to keep their finances independent. For internationals, there is an added layer: if you or your spouse have assets abroad, different nationalities, or moved to Sweden from another country, it may not be obvious which country's law governs your property. A prenup can be combined with a written choice-of-law agreement so that Swedish law (or another country's law) clearly applies, which avoids costly uncertainty later. Note also what a prenup does not do: it does not decide custody, maintenance, or who keeps the home, and it does not override the protection a surviving spouse or children have under inheritance law.
The legal requirements (formkrav)
The formal requirements are set out in Chapter 7, Section 3 of the Marriage Code, and they are strict. The agreement must be (1) in writing, (2) dated, and (3) signed by both spouses or future spouses. It must then be (4) registered with the Swedish Tax Agency (Skatteverket), which keeps the marriage register (äktenskapsregistret). Unlike in some countries, no witnesses and no notary are required, and there is no mandatory standard form. An äktenskapsförord has no legal effect at all until it is registered, so registration is not optional paperwork; it is what makes the agreement valid. You send the original document by post to Skatteverket, Äktenskapsregistret, 871 87 Härnösand, and pay a registration fee, which is 275 SEK. Both spouses' full names and personal identity numbers (personnummer) should be included. Timing affects when the agreement starts to apply: if an agreement signed by future spouses reaches Skatteverket within one month of the wedding, it takes effect from the wedding date; otherwise it takes effect from the day it arrives at the Tax Agency. For couples already married, it simply takes effect from the day it is received. Skatteverket only checks the basic formalities; it does not assess whether the content is fair or legally sound between you.
What separate property (enskild egendom) actually means
When an asset is made enskild egendom, it is excluded from the equal split in a bodelning. In a divorce, this is straightforward: separate property stays with its owner and is not counted when the marital property is halved. A subtle but important point is that, by default, the income and what replaces an asset are treated differently. If your prenup makes a sum of money separate property, anything you buy with it is generally also separate, but ordinary yield (such as interest or dividends) becomes marital property unless the agreement specifically says otherwise. Well-drafted agreements address this expressly. Be aware that the rules differ between divorce and death. On divorce, separate property is firmly kept out of the division. On the death of a spouse, the picture is more complex: a surviving spouse and any children still have inheritance protections under the Inheritance Code (Ärvdabalken), and a bodelning still happens. A prenup controls the property division, but it does not by itself decide who inherits. To control inheritance, you also need a will (testamente). Treating a prenup as a substitute for a will is a frequent and serious error.
Common mistakes and how agreements fail
The most common failure is the simplest: the agreement is never registered with Skatteverket, or is registered too late, so it has no legal effect when it is finally needed. Because effect depends on registration, a signed-but-unregistered prenup is worthless. A second common mistake is vague drafting, for example writing "my savings are separate" without identifying accounts, or failing to say what happens to substituted assets and yield, which leads to disputes about what the agreement actually covers. A third is assuming a prenup deals with inheritance; it does not, and you need a separate will. A fourth, very relevant to internationals, is ignoring choice of law: if the couple has foreign connections and no clear governing-law agreement, a Swedish court may apply foreign property rules under the EU Matrimonial Property Regulation (2016/1103) and the Swedish implementing act (Lag 2019:234), producing an outcome neither partner expected. Finally, an extremely one-sided agreement is not always bulletproof. Under Chapter 12, Section 3 of the Marriage Code, a court can adjust or set aside a term of a prenup in a bodelning if it would be unreasonable (oskäligt), taking into account the content of the agreement, the circumstances when it was signed, and later events. Getting professional help with drafting reduces all of these risks.
FAQ
Do we need a prenup to get married in Sweden?
No. An äktenskapsförord is entirely optional. Without one, the default rule applies: all marital property (giftorättsgods) is split equally if the marriage ends. You only need a prenup if you want to change that default, for example to keep certain assets as separate property (enskild egendom).
Does the agreement need a notary or witnesses?
No. Swedish law (Chapter 7, Section 3 of the Marriage Code) only requires that the agreement be in writing, dated, and signed by both spouses, and then registered with the Swedish Tax Agency (Skatteverket). There is no requirement for a notary or for witnesses, unlike in many other countries.
How do we register it and what does it cost?
You post the original signed agreement to Skatteverket, Äktenskapsregistret, 871 87 Härnösand, and pay a registration fee of 275 SEK. The agreement has no legal effect until Skatteverket registers it, so registration is essential, not optional. If future spouses' agreement arrives within one month of the wedding, it applies from the wedding date.
Does a prenup decide who inherits if my spouse dies?
No. A prenup only governs the property division (bodelning); it does not by itself decide inheritance. A surviving spouse and children still have rights under the Inheritance Code (Ärvdabalken). To control who inherits what, you need a separate will (testamente) in addition to the prenup.
We are not Swedish citizens. Does Swedish law apply to us?
Not automatically. For couples with international connections, the EU Matrimonial Property Regulation (2016/1103) and the Swedish act Lag (2019:234) determine which country's law governs your property. You can usually agree in writing which law applies and register that choice with Skatteverket, which avoids uncertainty about how your assets would be divided.
Can a prenup be changed or cancelled later?
Yes. Spouses can sign a new äktenskapsförord at any time during the marriage, for example to turn separate property back into marital property, or to add new terms. The new agreement must meet the same formal requirements and be registered with Skatteverket to take effect. A court can also adjust an unreasonable term in a division under Chapter 12, Section 3 of the Marriage Code.
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