Marriage is a wealth machine, and the data is blunt about it. In Pfeffer and Killewald's 2017 decomposition of how wealth passes between generations, marriage explains 14.2 percent of the parent-child wealth...
Marriage is a wealth machine, and the data is blunt about it. In Pfeffer and Killewald's 2017 decomposition of how wealth passes between generations, marriage explains 14.2 percent of the parent-child wealth correlation, ahead of gifts and bequests. Households that pool two incomes, two networks, and two sets of family resources build and transmit more than the sum of two singles.
But the machine has plumbing, and the plumbing is account structure. Two people can earn well, save honestly, and still build a setup where money leaks through duplicated fees, invisible spending, or, at the worst possible moment, gets frozen in an account the surviving spouse cannot touch. This is the how-to for the plumbing. Total setup time: one evening of decisions, one bank visit.
Before choosing a structure, see the current one. Sit together and list every account either of you holds: bank accounts, mobile money wallets, SACCO accounts, investment accounts. For each, write four things:
` ACCOUNT MAP Institution and account type: Registered name(s) on the account: Who can withdraw (signatory rule): Does the other spouse know it exists? (yes / no) `
That last line is not a trap. It is a measurement. Most couples discover at least one account the other did not know about, and dormant, forgotten balances are a documented national problem, not a private quirk: regulators note the same pattern of idle accounts and untouched wallets across banking and mobile money that produced over Shs160 billion in unclaimed retirement money in Uganda alone.
The strongest default for most couples is three buckets, not one and not two.
Decide two numbers together: what percentage of each income goes to "ours" (equal percentage is usually fairer than equal amounts when incomes differ), and the personal allowance. Write both numbers down. Unwritten splits drift.
Full merging (everything joint) works for some couples and is simpler. It fits when incomes are similar, both partners actually look at the account, and both are savers. It fails quietly when one partner stops looking.
A joint account is not one thing. The mandate you sign at the bank decides who can move money, and most couples accept the default without reading it.
The pattern that works: either-to-sign on the operating "ours" account, both-to-sign on the serious savings. If your bank offers transaction limits instead (either-to-sign below a threshold, both above), that is often the best of both.
This is the section couples skip, and it is the one that decides whether your spouse eats in the months after a funeral.
Joint accounts. In most jurisdictions, a true joint account passes to the surviving holder, either automatically by survivorship or through a simple process on presenting a death certificate, because the survivor is already an owner. Check how your bank treats it, because in some markets the account is still restricted until the estate is opened. Ask the branch, in advance, the exact question: "If one of us dies, what happens to this account the next day?"
Sole accounts. An account in one name alone becomes part of the deceased's estate. The bank, correctly, freezes it. The surviving spouse then needs legal authority to touch it: a grant of probate where there is a valid will, or letters of administration where there is not. That process runs through court and takes months at best, longer where families dispute. During that time, the money is visible and untouchable.
Mobile money is the blind spot. A mobile money wallet is registered to one SIM and one national ID. There is no joint mobile money. Whatever sits on that SIM at death is locked to a name, and the telecom will demand the same estate paperwork as a bank, for a balance the family may not even know exists. If a large share of your household float lives on one spouse's SIM, you are running a sole account without noticing. Keep working balances on mobile money modest, sweep surpluses to the joint bank account on a fixed day each month, and record every wallet in your asset register.
The design conclusion: the survivorship-friendly joint account is your bridge money, the funds that keep the household running while the estate process grinds. Size it to at least three months of household expenses.
| Account purpose | Structure | Signatory rule | At death | |---|---|---|---| | Daily household operating | Joint | Either-to-sign | Survivor keeps access; bridge money | | Emergency fund (3-6 months) | Joint | Both-to-sign (or limit-based) | Survivor keeps access after simple process | | Big-goal savings (land, fees) | Joint | Both-to-sign | Survivor keeps access after simple process | | Personal allowance | Sole (one each) | Own signature | Frozen; passes through estate; keep small | | Business account | Sole or company | Per business need | Frozen unless company-owned; document it | | Mobile money wallets | Sole by design | Own SIM | Locked to registered name; sweep monthly |
The pattern the table encodes: joint where the family must keep functioning, sole where autonomy matters, and small wherever sole is unavoidable.
Do Steps 1 and 2. One evening, both of you, phones off: map every account and wallet including mobile money, and agree the ours percentage and the personal allowance. Book the bank appointment for the signatory mandates before you go to bed, because the map you just drew is only a drawing until the mandates match it.