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  • CDI Variation (FINA171 - SIGAFIN)

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The calculation of the variation in CDI accrued between periods is executed according to the following formula,

 

where:


              C = Product of the rates DI-CETIP Over using the percentage highlighted, from the initial date (included)
 up to the final date (exclusive), calculated with the rouding of 8 (eight) decimal places.

              n = total number of rates DI-CETIP Over, where n is an integer.

              p = highlighted percentage for payment, with 4 (four) decimal places.

TDI        k = Rate DI-CETIP Over, expressed in days, calculated with the rounding of 8 (eight) decimal places.


 


For CDI rates published up to 12/31/97, the formula DI_CETIP Over must be used:


Formula 1

 TDI K = DI K , where: k = 1, 2, ..., n

           3000


Example:

Highlighted percentage for payment

97.5000

k

DI

TDI

(DI/3000)

TDI *

(P/100)

(1+ TDI * (P/100)) * k-1 = Fator k

1

16.62

0.00554000

00540150

1.00540150

2

16.63

0.00554333

00540475

1.01083544

3

16.74

0.00558000

00544050

1.01633489

4

16.70

0.00556667

00542750

1.02185105


k-1 = (1+TDI * (p/100) de k -1. Except when k=1, once the multiplier is 1.


Multiplying K for CDI balance, the updated value is presented (interests included). Subtracting the balance of the updated value, the amount presented is the interest.



For the CDI rates published after 1/1/98, the formula must be:

Formula 2

 TDI K =( DI K + 1) 1/252,  where: k = 1, 2, ..., n

             100


Example:

Highlighted percentage for payment

97.5000

k

DI

TDI

(DI/3000)

TDI *

(P/100)

(1+ TDI * (P/100)) * k-1 = Fator k

1

16.62

0.00061031

00059505

1.000580174

2

16.63

0.00061065

00059538

1.001161008

3

16.74

0.00061439

00059903

1.001745742

4

16.70

0.00061303

00059770

1.002329521


Multiplying K for CDI balance, the updated value is presented (includes interests). Subtracting the balance of the updated value, the amount presented is the interest.


Fonte: www.cetip.com.br