Marriage, children, divorce: how life events change your finances

arvy's Teaser: You're getting married, having a child, or — maybe — separating one day. Each of these life events has massive financial consequences: taxes, pensions, property rights, inheritance, allowances. Most couples only think about it after it's already happened. This guide helps you think ahead.

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Part 1: Marriage

Taxes: Marriage Penalty, Marriage Bonus — and the March 8, 2026 Vote

In Switzerland, married couples are taxed jointly. Your incomes are added together, and a progressive tax rate is applied to the total. This creates two effects:

Tip for dual earners: Use the dual-earner deduction. At federal level, it's 50% of the lower income (max. CHF 14,100). Cantons have their own deductions — Zurich, for example, allows max. CHF 5,900 from the lower income.

Marital Property Regime: The Underestimated Topic

Without a prenuptial agreement (Ehevertrag), you automatically live under participation in acquired property (Errungenschaftsbeteiligung). Here's what that means:

"Most couples don't know which property regime they're under. It's like signing a contract without reading it."

Pensions: What Marriage Changes

Pension fund (2nd pillar): Your spouse automatically becomes the registered beneficiary. If you die, they receive a widow's/widower's pension (typically 60% of your retirement pension). For cohabiting couples: no automatic entitlement — you must actively register your partner with the pension fund, and even then, benefits are often lower.

AHV (1st pillar): Married couples together receive a maximum of 150% of a single pension (capping). Two unmarried individuals each receive 100%.

Pillar 3a: Each spouse can maintain their own 3a account and deduct the full amount (CHF 7,258 with pension fund, CHF 36,288 without). Use this as a couple: both contributing = double tax savings. (→ 3a Comparison Guide)

Inheritance Law: Why You Need a Will

Without a will, your spouse inherits 50% of the estate (the other half goes to your children). With a will and under the new inheritance law (since 1 Jan 2023), you can better protect the surviving spouse because children's compulsory shares were reduced from 3/4 to 1/2 of their statutory entitlement. Parents' compulsory shares were eliminated entirely.

Cohabitation: Without a will, your partner inherits zero. And even with a will, inheritance tax for non-relatives is brutal in many cantons (up to 50%). Marriage provides a massive financial advantage here.

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Part 2: Children

Child Allowances

Every child is entitled to a child allowance — regardless of the parents' income. Amounts vary by canton:

Note: Child allowances count as taxable income. They're added to your salary.

Childcare Costs: The Biggest Tax Deduction for Families

External childcare (daycare, childminder, after-school care) is expensive in Switzerland — often CHF 2,000–2,500/month per child in a city daycare. The tax deduction can at least partially compensate:

Example: A couple in Zurich with one child in daycare (CHF 24,000/year) and taxable income of CHF 180,000 can save CHF 3,000–5,000/year in taxes through the childcare and child deductions. (→ Tax Guide)

Pension Strategy as Parents

Children fundamentally change your pension situation — especially if one partner reduces their working hours:

What you should do as a couple:

1. Both keep contributing to 3a. Even the part-time partner with earned income can deduct the full 3a amount. As a family: 2× CHF 7,258 = CHF 14,516 tax deduction per year.

2. Check pension fund buy-in for the part-time partner. Whoever reduces hours often has buy-in potential. This is simultaneously pension building AND tax optimisation. (→ PK Statement Guide)

3. AHV child-raising credits (Erziehungsgutschriften). For each year you're raising children under 16, a fictional credit is added to your AHV account — currently CHF 44,100/year. For married couples, this is split equally. It can partially compensate contribution gaps.

4. Cohabitation agreement for unmarried parents. Without marriage, the caregiving partner has zero claim on the other's pension fund. A cohabitation agreement (Konkubinatsvertrag) regulates compensation for lost pension contributions — but only an estimated 5% of cohabiting couples have one.

Family Budget: The Honest Calculation

A child costs an average of CHF 1,200–1,800/month in Switzerland (direct costs including housing, food, clothing, childcare — excluding lost income). Over 18 years, that's CHF 260,000–390,000 per child.

The indirect costs (reduced hours, lower pension, missed career steps) are often even larger. An open discussion about work split, childcare model, and financial protection is essential — before the child arrives. (→ Budget Guide)

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Part 3: Divorce

About 40% of marriages in Switzerland end in divorce. For cohabiting couples, the separation rate is likely similar or higher. A divorce is not only emotional — it's one of the biggest financial disruptions.

What Gets Divided?

Cohabitation: Separation Without a Safety Net

A cohabitation agreement (Konkubinatsvertrag) regulates how assets, pensions, and childcare costs are split in a separation. It's not romantic — but essential, especially when children arrive and one partner reduces hours. Unfortunately, only an estimated 5% of cohabiting couples have one.

Closing Pension Gaps After Divorce

Pension fund buy-in: After divorce, gaps often appear in the 2nd pillar. These can be closed through a pension buy-in — which is tax-deductible. Special rule: the 3-year lock-up (no capital withdrawal within 3 years of buy-in) does not apply to buy-ins after divorce. (→ Tax Guide)

Top up 3a: Since 2026, you can retroactively pay missed 3a contributions. Ideal for closing gaps from years with reduced income. (→ 3a Guide)

Increase working hours: Whoever returns to working more after divorce automatically increases pension contributions and creates new buy-in potential.

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Overview: Marriage vs. Cohabitation — Key Differences

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Your Checklists

✅ Before Marriage

☐ Tax simulation: Will you pay more or less as a married couple? (Use ESTV tax calculator)
☐ Discuss property regime: Is participation in acquired property fine, or do you need separation of property?
☐ Create a will (yes, even before marriage)
☐ 3a: Are both partners contributing? Check maximum amounts
☐ Review pension fund beneficiary order

✅ When a Child Arrives

☐ Discuss work split — calculate financial consequences (pension gap!)
☐ Apply for child allowances (through employer)
☐ Budget for daycare costs → plan for tax deduction
☐ 3a: Both keep contributing — including the part-time partner
☐ Check pension buy-in for the partner reducing hours
☐ If cohabiting: Create or update cohabitation agreement
☐ Update will (children as heirs, designate guardian)

✅ At Divorce / Separation

☐ Request pension statements (both partners) — balance at marriage date and at filing date
☐ Open vested benefits account if no pension fund connection (→ Vested Benefits Guide)
☐ Apply for AHV splitting after legally binding divorce
☐ Calculate pension gaps: Buy-in possible?
☐ Catch up on 3a gaps (retroactive payments possible since 2026)
☐ Rebuild budget as a single person (→ Budget Guide)
☐ Update will (ex-spouse has no inheritance rights)
☐ If cohabiting: Divide assets per cohabitation agreement (or negotiate privately)

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