Joint borrower insurance: how to choose the right coverage split

Joint borrower insurance: why the coverage split really matters

When two people take out a mortgage together, the focus is usually on the loan rate (around 3.6% in 2026) and the purchase price. Yet the insurance rate (taux_assurance) and the way you split coverage between borrowers can add or remove tens of thousands of euros over the life of the loan.

In any buy or rent comparison, the coverage split (quotité) on joint insurance has a direct impact on:

• the monthly cost of the “buy” option (principal + interest + insurance)
• the financial risk for the surviving partner in case of death, disability or incapacity
• how attractive renting + investing (ETFs, savings, bonds) looks in comparison, since tenants do not pay borrower insurance

There is no universally “right” split: it depends on your situation, incomes and risk tolerance. The information below is educational only and does not constitute personal financial advice.

What is the insurance coverage split (quotité) in a couple?

The coverage split indicates what share of the mortgage is insured for each borrower. For a joint mortgage:

• the total coverage must be at least 100% of the loan amount
• it can go up to 200% if each borrower is insured at 100%

Typical coverage splits for couples:

• 50% / 50%: each partner is insured for half the loan
• 70% / 30%: the higher earner is covered more heavily
• 100% / 100%: each partner is insured for the full amount (total 200%)

The insurance rate (taux_assurance) for standard profiles in 2026 often falls between 0.25% and 0.45% per year, applied to the insured capital. It can be higher depending on age, health or risk factors.

How the coverage split changes the real cost of your mortgage

Base example: €300,000 over 25 years

Take a couple buying a home:

• Purchase price: €300,000 (excluding notary and agency fees)
• Loan term: 25 years (300 months)
• Loan rate: 3.6%
• Insurance rate (taux_assurance): 0.30% per year on the initial capital

Monthly mortgage payment (principal + interest, no insurance): about €1,520.

Case 1: 100% total coverage (50% / 50%)

Total insured capital: €300,000.

Annual insurance cost: €300,000 × 0.30% = €900 / year, around €75 / month.

Split between borrowers:

• Borrower A: €37.50 / month
• Borrower B: €37.50 / month

Approximate total insurance cost over 25 years: €900 × 25 = €22,500.

Case 2: 200% total coverage (100% / 100%)

Total insured capital: €600,000 (full loan amount for each borrower).

Annual insurance cost: €600,000 × 0.30% = €1,800 / year, around €150 / month.

Total insurance cost over 25 years: €1,800 × 25 = €45,000.

Numeric takeaway: moving from 100% to 200% coverage almost doubles your insurance cost. In a buy or rent comparison, that extra €22,500+ must be weighed against:

• notary fees (about 7–8% in existing property, 2–3% in new build)
• property tax (often 1–2 months’ rent per year, with annual reassessments)
• the potential return if you stayed a renter and invested the difference (long‑term 3–5%/year on diversified ETFs, for example)

What the coverage split really protects in a couple

Scenario 1: 50% / 50% coverage

If one partner dies:

• the insurer repays 50% of the remaining capital
• the surviving partner must continue to repay the other 50%

Back to our example after 10 years: roughly €220,000 remains outstanding.

• With 50% / 50%: the insurer pays €110,000, the survivor still owes €110,000
• Remaining monthly payment (no insurance): about €760 / month

Key question for a buy or rent decision: can the surviving partner shoulder €760 / month alone, plus property tax, condo fees, maintenance and inflation on all other expenses?

Scenario 2: 70% / 30% coverage

Assume the higher earner is covered at 70%.

If that person dies with €220,000 outstanding:

• insurance pays 70% of the balance: €154,000
• the survivor owes the remaining €66,000
• remaining monthly payment: roughly €450 / month

That’s much easier to manage, but if the 30%‑covered partner dies instead, the protection is weaker. This is why aligning coverage with each income’s weight in the household budget is so important.

Scenario 3: 100% / 100% coverage

If one partner dies:

• the insurer repays 100% of the outstanding mortgage
• the surviving partner has no more mortgage payments (but still pays property tax, insurance, maintenance, etc.)

This is maximum protection and maximum cost. The choice is not purely financial: it’s also about how much peace of mind the couple wants to buy.

Linking the coverage split to your incomes and life plan

1. Who really pays the mortgage?

Start with a simple diagnostic: who brings what share of net income?

• If A earns €3,000 net and B €1,500, A provides about two‑thirds of the household income.
• A split like 70% (A) / 30% (B) often reflects that reality.

The taux_assurance applied to A will generate a higher insurance premium in euros, because A’s coverage percentage is higher, but that’s also where most of the economic risk lies.

2. Time horizon and mobility: key for any buy or rent analysis

The shorter your holding period (5–7 years), the heavier the fixed costs of buying — notary fees, agency fees, renovation work and insurance — relative to renting.

Example:

• Buying with 200% coverage: €150 / month in insurance
• Renting at €1,200 / month and investing €150 / month in an ETF at 4%/year

After 7 years, those €150 monthly investments would be worth around €14,000 (assuming monthly compounding). Opting for higher coverage means less cash to invest, but more security for the survivor.

3. Income stability and professional risks

If one partner is a permanent employee in a stable sector and the other is a freelancer with volatile income, you have (at least) two ways to think about the split:

• give higher coverage to the stable income (60% / 40%), because that person is the backbone of the mortgage
• or over‑insure the riskier profile (70% for the freelancer) if losing that income would be the most damaging to your budget

There is no automatic rule: it’s a couple’s risk‑management decision.

How the insurance rate (taux_assurance) shapes the buy or rent trade‑off

1. When the insurance rate is high

Some profiles face a much higher taux_assurance than 0.30%: smokers, borrowers over 45, certain medical histories or hazardous jobs. If your rate doubles from 0.30% to 0.60% on a €300,000 loan with 200% coverage:

• Insured capital: €600,000
• Annual insurance cost: €600,000 × 0.60% = €3,600 / year
• Monthly insurance: €300 / month, versus €150 / month at 0.30%

Over 25 years that’s €90,000 instead of €45,000. In a buy or rent simulation, those extra €45,000 must be compared with:

• rising rents if you stay a tenant (often indexed annually to inflation)
• the return on investments if you invest the difference between buying and renting at a realistic investment rate (for example 3–5%/year long term)

2. When a lower coverage split frees cash to invest

Going from 200% to 100% coverage in our base case saves about €75 / month in insurance. If you invest those €75 every month at 4%/year for 20 years, the future value is around €27,000.

Reducing the coverage split is not automatically better: you are trading some mortgage protection for more financial assets. Depending on your risk appetite, family situation and other safety nets (pensions, life insurance), you may prefer one or the other.

Using a simulator to test different joint insurance strategies

To see the impact of the coverage split and taux_assurance numerically, a tool like the buy vs rent simulator on acheter-ou-louer.com is extremely useful. You can:

• enter your loan rate (for example 3.6%) and loan term
• set the insurance rate (taux_assurance) according to your quotes
• test total coverage levels of 100%, 150% and 200%
• include property tax, with an annual increase assumption
• input an investment rate for the renter scenario (e.g. 3–5%/year)
• factor in annual inflation and rent indexation

The simulator lets you compare, year by year, your net wealth under three main paths:

• Path A: buy with 100% total coverage
• Path B: buy with 200% coverage (joint insurance fully mirrored)
• Path C: rent and invest the savings

This gives a more objective picture than rules of thumb, and helps you understand how much of your total housing cost is driven by the coverage split and the insurance rate.

Practical checklist to choose a joint insurance split

1. Map your risks

• Is there a large income gap between partners (over 30%)?
• Is there a significant age or health difference?
• Are you planning children, parental leave or part‑time work?
• Could one partner realistically pay the full mortgage + property tax + bills alone?

2. Run the numbers for several options

• Compute total insurance cost at 100%, 150% and 200% coverage with your taux_assurance.
• Estimate the surviving partner’s remaining payment under each scenario.
• Compare that with a realistic market rent, including annual rent increases.

3. Consider your time horizon

• If you might move within 5–7 years, buying (and insuring) is a heavy commitment: notary fees, agency fees, renovation, insurance and potential prepayment penalties (often capped at 3% of the outstanding balance or 6 months of interest).
• Over 20–25 years, the insurance protection can make more sense, especially if property tax remains manageable relative to your income.

Conclusion: balancing cost, safety and flexibility

The coverage split on joint borrower insurance is not a marginal detail. It influences:

• the total cost of buying (sometimes by €20,000–€40,000 over the term)
• the financial safety net for the surviving partner
• the result of your overall buy or rent analysis, once you include loan rate, taux_assurance, property tax, inflation and investment returns

There is no one‑size‑fits‑all answer: the ideal joint insurance split depends on your specific situation, goals and risk tolerance. This article is not personal financial advice; for decisions with major consequences, consider speaking to a qualified professional (broker, financial adviser, notary).

To quantify the impact of the insurance rate and coverage split on your long‑term wealth, and to compare clearly whether it is better to buy or rent in your case, use our simulator: Simulate your situation on buy-or-rent.net.