South Africans carefully compare home loan rates, scrutinise insurance premiums, and negotiate car prices, yet when it comes to money in relationships, many abandon caution altogether. Joint bonds are signed. Surety agreements are concluded. Beneficiaries are added and changed. Joint accounts are opened. All in the name of love.

According to Keith Peter, Advice Manager at Old Mutual Personal Finance, this emotional decision-making could lead to a quiet but costly financial blind spot for couples.

“Love creates optimism bias. When people are in a committed relationship, they assume it will last forever. That optimism is natural, but it can lead to decisions made with emotion rather than long-term financial logic, yet the reality is that financial contracts don’t operate on emotion; they operate on legal obligation,” Peter warns.

From co-signing loans and standing surety, to opening joint bank accounts, buying property together, or financing household goods in one partner’s name, many shared financial decisions carry legal consequences that can outlive the relationship itself.

“If you sign as a co-principal debtor or surety, you remain legally responsible until the debt is fully settled, even if the relationship ends, whether through separation or death,” explains Peter.

Many couples assume that shared financial arrangements can easily be undone. In practice, reversing them can be costly, complex and, in some cases, dependent on third-party approval.

Closing a joint bank account typically requires both parties’ consent. Removing a partner from a home loan requires bank approval and a new affordability assessment. Standing surety cannot simply be withdrawn unless the credit provider accepts a replacement, and transferring property between spouses can be costly

Even medical aid changes can require documentation, proof of separation, and may trigger new waiting periods for the partner being removed and joining a new medical aid

“One of the most overlooked risks is beneficiary nominations,” Peter says. “You can change them, but people often forget. If you don’t update your life policy or Will, the insurer is legally obliged to pay the person listed, even if that was not your intention”.

The real danger, he adds, is not always irreversibility, but a lack of awareness. As the saying goes, communication is the cornerstone of any relationship. Yet one of the biggest barriers to financial conversations between partners is the fear that discussing worst-case scenarios signals a lack of trust.

Peter disagrees, however.

“Protection is about responsibility, not doubt. We insure our homes and cars because we understand risk, not because we expect disaster. The same principle applies in relationships,” he says.

Life events such as illness, disability, retrenchment or death can destabilise even the strongest partnerships. Without structured planning, preferably with a financial adviser, these shocks can leave one partner financially exposed or legally entangled.

“Therefore, planning for ‘what if’ scenarios isn’t about predicting the worst but about ensuring that if life changes, neither partner is financially devastated,” Peter says.

Clear agreements around debt, asset ownership, beneficiary nominations and emergency planning reduce stress during already emotional times and help prevent conflict.

The average South Africans consumer faces rising living costs, higher borrowing expenses and ongoing economic uncertainty. In this environment, financial missteps can have long-term consequences.

Peter believes couples should not avoid shared financial decisions but approach them deliberately.

“Love is emotional. Money is practical. When the two mix, couples need to slow down and apply both heart and logic, because honest and open financial planning done together as a couple is not a sign of mistrust, it is an act of care”.

Ultimately, Peter adds, the strongest relationships are not just built on commitment, but on clarity. “Because while happily ever after remains the goal, the couples most likely to achieve it are those who plan for more than just the fairytale,” Peter concludes.