Savings accounts & money-market funds
Low risk
What it is
The calmest instrument there is: a bank account or a fund that invests in very short-term, high-quality debt. Money stays liquid — available in hours, sometimes instantly — and returns roughly track short-term interest rates.
How to buy it
Open a savings account at any regulated bank, or a money-market/liquidity fund through your bank's app or a regulated broker. There is usually no minimum, and no lock-up period.
Pros
- Fully liquid — withdraw anytime
- Usually covered by deposit insurance up to a limit
- Zero learning curve to open
Cons
- Returns are the lowest of any instrument on this site
- Rarely beats inflation by much, if at all
- Not designed for long-term growth
What it actually costs
Opening one is normally free, but the costs are real and easy to miss: monthly maintenance charges on some accounts, minimum-balance rules that trigger a fee when you dip below them, transfer and ATM charges outside the bank's own network, and — for a money-market fund — an annual management commission deducted daily from the fund's value. The largest cost of all is inflation, which never appears on any statement.
Who it suits, and who it does not
This is the right home for your emergency fund and for any money you expect to need within roughly a year: a deposit for a flat, next semester's tuition, a planned trip. It is the wrong home for money you will not touch for five years or more, where the near-certain loss of purchasing power outweighs the comfort of the balance never moving.
A worked example
If a savings account pays an annual rate close to inflation, MXN 10,000 sitting there for a year roughly keeps its purchasing power — it does not meaningfully grow it. That is the point: this is where your emergency fund lives, not your growth money.
Common mistakes with this instrument
- Leaving long-term savings here for years because it feels safe — safe from price swings is not the same as safe from inflation.
- Chasing a promotional rate that applies for three months, to a capped balance, and then quietly reverts.
- Not checking that the institution is regulated and that the account is covered by the country's deposit-insurance scheme.
How to reach it, country by country
In Mexico, a savings account or a liquidity fund at a CNBV-regulated institution, with IPAB deposit insurance. In Brazil, a conta plus a fundo DI or Tesouro Selic for the same job, with FGC covering the bank side. In Colombia, a cuenta de ahorro at a Fogafín member. In Chile, a cuenta vista or a money-market fondo mutuo. In Argentina, a caja de ahorro plus an immediate-liquidity FCI. In Peru, a savings account at an institution covered by the Fondo de Seguro de Depósitos.