The real and your purchase: how the exchange rate shapes a foreign buyer's entry (and off-plan installments)

For anyone earning in dollars, euros or pesos while eyeing an apartment in Florianópolis, the sticker price is only half the story. The other half is the exchange rate: a factor that shifts every day and that, in an off-plan purchase paid in installments, can keep moving for years. This guide explains — as general education, not advice — how the real shapes a foreign buyer's entry cost, and why INCC-indexed installments deserve a closer read.

The real after 2021: what a weaker real does to your entry cost

A buyer bringing hard currency converts income into reais to pay. When the real weakens, each dollar or euro buys more reais, and the same apartment costs less in the home currency. When the real strengthens, the opposite happens.

The recent trajectory makes the point. According to exchange-rate data compiled by CEIC/Statista, the annual average USD/BRL was roughly R$ 5.39 in 2021, R$ 5.16 in 2022, R$ 5.00 in 2023, R$ 5.39 in 2024 and R$ 5.59 in 2025: the real appreciated in 2022–2023 and weakened again in 2024–2025. So far in 2026 it has partly recovered: the Banco Central do Brasil reported a PTAX reference rate of R$ 5.1253 per dollar on 4 September 2026, and TradingEconomics recorded the real near R$ 5.10 that same week, a three-week high.

The lesson is not to predict the next move but to recognize that the currency discount is real and variable. A real weaker than its historical average cheapens the entry; but that same discount can evaporate if the real strengthens before the payments are complete.

The double-index problem: INCC-indexed installments in reais vs. income in dollars, euros or pesos

In an off-plan purchase (under construction), the price is rarely paid at once. It is paid in installments during the build, and those installments are usually adjusted by a construction-cost index. The most common is the INCC (Índice Nacional de Custo da Construção, measured by FGV); in Santa Catarina the CUB/SC, calculated by Sinduscon, is also used as a reference.

This creates a double index for the foreign buyer:

• Index 1 — the INCC/CUB, which adjusts the outstanding balance in reais. According to FGV, the INCC-M accumulated 6.56% over the 12 months to August 2026 (6.45% to July). In Santa Catarina, Sinduscon reported a CUB/SC of R$ 3,121.62 per m² in July 2026, up 3.75% year-to-date in 2026 and 5.26% over 12 months.
• Index 2 — the exchange rate, which translates each real-denominated installment into your income currency.

The result is that two forces act on every installment at once. The balance in reais rises with construction inflation, while its value in hard currency depends on the exchange rate on the day you pay. A weakening real can offset (partly or fully) the INCC adjustment; a strengthening real amplifies it. Neither is a promise — both are variables.

When an FX gain offsets local appreciation and when it doesn't

A purely illustrative example, using no real figures from any property: if the local price rises with the INCC adjustment but the real weakens by a similar proportion, the cost in dollars can stay almost flat. If the local price rises and the real also strengthens, the hard-currency cost climbs twice over. And if the real weakens faster than the index adjustment, the foreign buyer may end up paying less in their own currency despite the increase in reais.

The educational takeaway: an FX gain and local appreciation do not add up mechanically. They interact. Judging an off-plan purchase by the real price alone — or by today's exchange rate alone — ignores that both will keep moving until the final installment.

General hedging concepts (education, not a recommendation)

There are currency-risk ideas worth knowing and discussing with qualified professionals before applying them:

• Paying in tranches: converting currency as installments fall due, rather than all at once, spreads the risk of buying reais on a single day.
• Watching the câmbio: following the official PTAX rate and planning conversions with a margin, without trying to “call the bottom”.
• Liquidity buffers: keeping a cushion in case the real strengthens exactly when an installment is due.
• Financial instruments: banks and FX houses offer hedging products; their use, cost and suitability depend on each profile.

None of the above is investment, legal or tax advice. The treatment of FX, fund transfers and taxes varies by home country and personal situation; consult a licensed accountant, lawyer or financial adviser before deciding.

Where to watch the official numbers: the Central Bank's PTAX and Focus

To avoid relying on headlines, go to the source:

• PTAX (Banco Central do Brasil): the official reference rate for the real, commonly used in contracts. It is the number to check on the day of each conversion.
• Focus Report (Banco Central do Brasil): a weekly survey of market expectations. In early September 2026, the Focus median for the dollar at end-2026 held around R$ 5.20, with the Selic policy rate at 13.75% per year and expected inflation (IPCA) near 5% for 2026. These are expectations, not facts: they change weekly and should not be read as a guaranteed forecast.

Checking PTAX for the present and Focus for the consensus of expectations — and returning to both regularly — is the most level-headed way to follow a purchase whose real cost is set installment by installment.

Sources

• Banco Central do Brasil — Exchange rate / PTAX
• Banco Central do Brasil — Focus Report
• FGV IBRE — INCC-M
• Sinduscon — CUB/SC
• TradingEconomics — Brazilian Real
• Statista — USD/BRL