The call comes on a Tuesday. A clinic in Belo Horizonte wants R$8,000 before it will schedule your father’s procedure, and it wants it this week.
You have an emergency fund. US$14,000, in a savings account in the country where you work, and it will not be R$8,000 in Brazil by Friday — not at a rate you would choose.
That is the whole problem, and it is not a problem about how much you saved. It is a problem about where.
How big a fund should be, and what “liquid” means, are the single-currency basics, covered in how to build an emergency fund. This post is only about what appears when you earn in one currency and owe in two. Every figure below is a clearly labelled example.
One question decides it
Not which currency is stronger. Not which one pays more interest. Not even where you live.
In which currency would the emergency actually be paid?
A hospital in Brazil bills in reais. Your grandmother’s roof is quoted by a builder in Contagem, in reais. A month of your own rent abroad is not.
So the fund is not one pot in one place. It is a list of obligations, each with a currency already attached, and the work is noticing which — because currency follows the payee, never the payer.
One subtlety catches people. An emergency in Brazil that needs you there is paid partly in your own currency, because the ticket is bought where you are. Some emergencies land in both columns, and belong in both.
Build the two columns
Write down the real obligations, not a feeling about them. A worked set of example figures:
| Obligation (example figures) | Paid in | Amount |
|---|---|---|
| Your rent and utilities abroad | US$ | US$1,900 / month |
| Your food, transport, phone, insurance | US$ | US$900 / month |
| Health insurance deductible | US$ | US$1,500 one-off |
| Flight to Brazil at short notice | US$ | US$1,400 one-off |
| Parents’ fixed costs (aluguel, condomínio, plano de saúde) | R$ | R$3,200 / month |
| A medical event the health plan does not cover | R$ | R$8,000 one-off |
| Costs on the apartment you kept (IPTU, repairs) | R$ | R$4,000 / year |
Size each side for six months of its own monthly costs plus its one-offs. Each column is a separate sum, and neither converts into the other.
- The currency you earn in. 6 × US$2,800 = US$16,800, plus US$1,500 and US$1,400 = US$19,700.
- Reais. 6 × R$3,200 = R$19,200, plus R$8,000 and R$4,000 = R$31,200, which is about US$6,240 at an example rate of R$5.00.
Together that is about US$25,940 of equivalent value, of which R$31,200 is roughly 24%. The useful output is not the total. It is the ratio — about a quarter in reais, three quarters in the currency you are paid in.
Note where the flight sits: the left column, even though the emergency is in Brazil. Redo both sums with your own numbers and your ratio will not be 24%.
Why “hold it all where the rate is higher” is a bet
Brazil often pays a far higher nominal rate than a hard-currency deposit account, and the temptation is obvious: hold it all in reais and collect the difference.
Take an example gap of 8 percentage points a year. Do not take that number from me — the Selic rate is published by the Banco Central and your own deposit rate is on your statement. Check both.
All of US$25,940 in reais at R$5.00 is R$129,700. Only R$31,200 of that matches a reais obligation, so R$98,500 — the US$19,700 you actually owe abroad — is the part on the wrong side. Grow it a year at the 8-point gap and it is R$106,380. Then let the rate move.
| Example rate after one year | R$106,380 is worth | Against the US$19,700 it was |
|---|---|---|
| R$5.00 (unchanged) | US$21,276 | ahead by US$1,576 |
| R$5.40 (real 8% weaker) | US$19,700 | level |
| R$5.75 (real 15% weaker) | US$18,501 | behind by US$1,199 |
| R$6.00 (real 20% weaker) | US$17,730 | behind by US$1,970 |
Row two is level because the table measures only the gap, holding the other side flat. Eight percentage points of extra yield are erased by an eight percent move in the exchange rate.
Open the Banco Central historical series and count the 8% moves yourself — five minutes, free, and you will never call that position conservative again.
This is not an argument against holding reais, but against holding reais you do not owe. Reais matched to a reais obligation carry no currency risk at all, because the obligation moves with them: a natural hedge, and the only free thing in this subject. Reais held beyond those obligations are a position, not a fund.
None of this is personalized investment advice, and which instrument each side sits in depends on facts an article cannot see. Making the two rates comparable is its own exercise, in comparing a CDB with a US savings account — a CDB being a certificate of deposit issued by a Brazilian bank.
The liquidity test each side has to pass
A fund is not liquid because a product sheet says “daily liquidity”. It is liquid if it passes five tests on a day you did not plan, and the reais side usually fails one.
- Same day, not same business day. Brazilian settlement is quoted in business days, and a Brazilian holiday your calendar does not show is a real delay.
- Reachable from the wrong time zone. Money released only by a call during Brazilian banking hours is not liquid at 3am.
- Reachable without converting. If producing R$8,000 means selling dollars first, the split failed and you are converting under duress, at whatever rate the worst day offers.
- Reachable without you. A balance only your phone can unlock has one point of failure, sometimes on a plane.
- Reachable without a dead phone number. Brazilian bank authentication is built around a device and a number you still control — the checklist is in keeping a Brazilian bank account while you live abroad.
The third test does the real work. The whole purpose of splitting the fund is to never convert during an emergency, which stacks two risks in the worst possible order.
The rule that keeps the split honest
Review on a date, twice a year — on the date, not on the rate. Reviewing because the rate moved is timing with extra steps.
Measure each side in months of its own obligations, never a converted total. Say the real weakens 10%, R$5.00 to R$5.50: your reais side was US$6,240 and reads US$5,673, a US$567 loss on the dashboard.
But R$31,200 still covers exactly six months of R$3,200 plus both one-offs. Nothing about your coverage changed. Months are the true reading; the converted total is noise.
Top up a short side from income, not by converting the other side. If the reais side is R$4,800 light, an example R$400 a month closes it in twelve. Converting to rebalance crystallizes a rate you did not choose, which is how a hedge becomes a trade.
One trigger does not wait for the review date. When an obligation changes currency, the split changes the same day — you sell the apartment in Brazil, your parents move in with you, you return to Brazil for good.
Where I stop
I am not telling you what your ratio should be. The columns are yours, and a number invented for a table is not a recommendation. This post gives you a question and the arithmetic; the answer is whatever your own obligations say.
Whether any of it has to be declared, and by whom, is a question for a contador — a Brazilian accountant. That is the entire extent of what I will say about tax.
Do this tonight
- Write the two columns. Real obligations, real currencies, real amounts, including the flight. Twenty minutes.
- Compute months of coverage on each side separately and write both numbers where you will see them again.
- Run the five liquidity tests against the reais side, and fix whichever it fails.
- Put a review date six months out.
Then keep the one sentence, because it survives every change in rates: the fund lives in the currency the emergency gets paid in.
The wider set of decisions is mapped in the guide to earning abroad with money in Brazil.