Brazilian Taxes: IR and IOF

IR (Income Tax)

Based on the number of days invested:

Days	IR %
0–180	22.5%
181–360	20%
361–720	17.5%
720	15%

You can calculate IR with:

calcIRRate(400); // 17.5%

IOF

Applied to credit card revolving interest.

The library calculates IOF automatically inside the credit card simulator.

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