1) TOURIST VISA EXEMPTION – when traveling for i) leisure, visiting friends and family, ii) unpaid participation in a conference or tournament or iii) living in Brazil with an extension protocol from the Federal Police or Ministry of Justice:
Those traveling with passports issued by one of following country is exempt from getting a visa to travel as tourists for up to 30 days within a 180 day period: Singapore.
Those traveling with passports issued by one of following country is exempt from getting a visa to travel as tourists for up to 60 days within a 180 day period: Venezuela.
Those traveling with passports issued by one of following countries are exempt from getting a visa to travel as tourists for up to 90 days within a 180 day period:

 
2) BUSINESS VISA EXEMPTION – when traveling to Brazil  i) to participate in business meetings and represent its company in a trade show or in a business negotiation such as to sell, to purchase, to inspect merchandise prior or after shipment, to discuss internal company policies; or iii) flight/ship crew without an International Crew card, or iv) for media coverage or filmmaking
Those traveling with passports issued by one of following country is exempt from getting a visa to travel for business purposes* for up to 30 days within a 180 day period: Singapore.
Those traveling with passports issued by one of following country is exempt from getting a visa to travel for business purposes* for up to 60 days within a 180 day period: Venezuela.
Those traveling with passports issued by one of following countries are exempt from getting a visa to travel for business purposes* for up to 90 days within a 180 day period:

 
3) OTHER VISA EXEMPTIONS:
Those traveling with valid passports from the following countries are also exempt from getting a VITEM I, VITEM IV, VITEM VI or VITEM VII for stays up to 90 days within a 180 day period:

4) FIRST ENTRY RESTRICTIONS: Visas will be considered void if its holder fails to comply with the first entry requirement. The time the first entry must take place will depend on applicant’s nationality and on the type of visa held as listed below:
4.A) 90 DAYS FROM THE DATE OF ISSUANCE: Those traveling with passports issued by the following countries must enter Brazil within 90 days from the issuance of any type of visa:

Therefore, citizens of the above mentioned countries must apply for their visas within less than 90 days prior to the intended departure date. It is also recommended to submit the complete and accurate visa application at least 2 weeks before the trip. Please plan ahead.
4.B) DURATION OF THE VISA: Brazil has visa agreements with certain countries. For those eligible for long duration tourist and/or business visas (valid for more than 90 days), the validity will count from the date of issuance of the visa:

4.C) 1 YEAR FROM THE DATE OF ISSUANCE: If your country of citizenship and type of visa is not listed on items 4.A or 4.B, the first entry must take place up to one year from the date of issuance of the visa.