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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:

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:

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