One pot, two lifespans

The theory of drawing an income as a couple is well covered elsewhere. This is about the version you meet in practice.

The horizon is longer than either person

A couple's money has to last until the second death, which is a materially longer period than for either individual alone. Plans built on one person's expected lifespan understate the horizon and therefore overstate what can safely be withdrawn.

The probability that at least one of two people reaches any given age is higher than for either of them separately. This is straightforward arithmetic and it is routinely omitted from informal planning conversations. Actuarial tables in most countries publish joint figures, and those are the correct input for a joint plan.

Income falls further than spending does

When one partner dies, some income sources stop or reduce, depending entirely on how they were arranged years earlier. Household spending falls too, but generally by far less than half, because housing and standing costs barely change.

The gap between those two declines is the risk, and it can be substantial for the person left behind. Whether a pension continues to a survivor, and at what proportion, is decided at purchase and frequently cannot be altered. That decision is made once, often quickly, and its consequences land decades later on the person who did not make it.

Both people need to understand the arrangement

Financial administration in couples is frequently handled by one person, which creates an obvious single point of failure. The survivor often deals with the arrangement for the first time during the worst weeks of their life.

A written summary of what exists, where it is held and who to contact addresses most of this at almost no cost. An annual conversation in which both people can explain the plan works better than any document on its own. This is the argument for naming a witness, applied to the person most affected by whatever the answer turns out to be.

Different horizons inside one plan

Partners frequently differ in age, in health, in risk tolerance and in capacity for loss, sometimes considerably. A single allocation has to serve both, and the compromise is much easier to hold when it was discussed rather than assumed. Where one partner would abandon the plan during a fall and the other would not, the plan has to accommodate the first.

Put simply, splitting the portfolio notionally by purpose rather than by person often resolves this better than splitting by account.

The legal and tax position of assets held jointly or separately differs by country and affects what is even possible.

The decisions that need making together

Whether to take survivor benefits, and at what level, is a joint decision with a permanent effect on one person. When each person starts drawing a pension can be staggered, and that choice interacts with the survivor position. Whether to buy guaranteed income, and on one life or on two, has very different implications for each partner.

These are exactly the questions where regulated advice in your own jurisdiction is worth what it costs. They are also the questions most often deferred until one of them can no longer be made jointly at all.

Separation and the plan

Plans are written for a household that may not remain a household, and the arrangements are frequently hard to unwind. Pension sharing rules on separation vary considerably by country and form one of the more complex areas of family law.

Nominations, joint accounts and survivor benefits all need revisiting after any change in relationship status. None of that is comfortable to plan for and all of it is cheaper to address before it is actually needed. Legal advice locally is the right route, and the financial plan should follow the legal position rather than assume one.

The takeaway

Plan for the second phase, when one person is managing alone. That is the part most plans never rehearse.

Small and repeatable beats ambitious and abandoned, almost every time.