Updated October 12, 2026
The scenario
Both variants use BRL 300,000, 360 months, SAC and the BCB median for TR-indexed mortgages. The second repeats the highest SGS 226 observation in the annual window.
How to interpret
The accumulated difference shows sensitivity to the adjustment assumption. It is not a guaranteed future cost; replace the series to explore another path.
BCB reference rate: 2026-08, median of 12 institutions.
TR reference: 0.1760% monthly, observation dated October 14, 2025, repeated only as an estimate.
Parameters used
- Financed amount
- R$300,000.00
- Term
- 360 months
- Interest rate
- 11.7489% effective per year
- System
- SAC
- Monthly adjustment
- 0.1760%
- Extra amortization
- —
Calculated results
| Scenario | Without TR | With estimated fixed TR |
|---|---|---|
| First payment | R$3,623.33 | R$3,629.71 |
| Last payment | R$842.29 | R$1,584.05 |
| Total interest | R$503,596.99 | R$629,812.60 |
| Total paid | R$803,596.99 | R$1,048,793.48 |
| Effective term | 360 months | 360 months |
| Accumulated adjustment | R$0.00 | R$118,980.88 |
Selected installments
| Payment no. | Payment | Interest | Amortization | Closing balance |
|---|---|---|---|---|
| 1 | R$3,629.71 | R$2,794.91 | R$834.80 | R$299,693.20 |
| 12 | R$3,613.53 | R$2,762.43 | R$851.10 | R$296,184.44 |
| 60 | R$3,518.38 | R$2,592.32 | R$926.06 | R$277,818.52 |
| 180 | R$3,068.68 | R$1,925.06 | R$1,143.62 | R$205,851.88 |
| 360 | R$1,584.05 | R$14.60 | R$1,569.45 | R$0.00 |
Limits of this analysis
- Repeating the highest observation monthly is a conservative assumption, not a forecast.
- Does not reproduce anniversaries, lags and other contract criteria.
Sources and review
- Central Bank of Brazil — TR series SGS 226 · July 27, 2026
- Central Bank of Brazil — credit operation interest rates · July 27, 2026