When buying an off-plan property in Brazil, the purchase price is often paid over time. That makes one contractual detail fundamental: which index adjusts each outstanding amount, during which period, and under what formula. IGP-M, IPCA and INCC are not interchangeable. This guide explains their roles without trying to forecast future rates.
INCC: the construction-cost index
INCC is the National Construction Cost Index published by Fundação Getulio Vargas (FGV). It tracks changes in construction costs, including materials and labor. It is commonly used to adjust an outstanding balance while a project is being built, but the contract—not the acronym alone—determines the applicable version, base date, frequency, scope and end date.
IGP-M: a broad price index
IGP-M is also published by FGV. It is a broad index that combines wholesale, consumer and construction-price components. Because its composition differs from consumer inflation, its behavior can differ materially from IPCA. It may appear in some real-estate agreements, but a buyer should never assume it applies after handover or to every installment without reading the signed terms.
IPCA: Brazil's official inflation reference
IPCA is produced by IBGE and is the official inflation reference used by the Brazilian federal government. It measures changes in the cost of a basket of goods and services consumed by households. A contract may use IPCA for a balance, financing arrangement or another stage, but the legal and financial effect comes from the specific clause and the financing documents.
What the contract must make clear
| Question | Why it matters |
|---|---|
| Which index applies to each payment stage? | A deposit, installments during construction, handover balance and financing can follow different rules. |
| What is the base date and frequency? | The calculation depends on the reference month and when the adjustment is applied. |
| What happens at handover? | The agreement should state whether the adjustment method changes, when it changes and what happens to the remaining balance. |
| Are interest, penalties or financing separate? | Indexation is not the same as interest, late-payment charges or bank financing costs. |
A practical review before signing
- Ask for the complete payment schedule, not only the initial installment.
- Locate the adjustment clause, formula, base month and any replacement index.
- Separate construction-stage adjustments from post-handover financing terms.
- Model the commitment with conservative assumptions rather than a single historical rate.
- Have a qualified Brazilian lawyer or financial professional review terms you do not understand before signing.
Read next: Off-plan property in Brazil: checklist before signing · Buying property in Brazil as a foreigner · Buying at launch: what to assess.