Then, you must maintain that balance for 60 additional days. To qualify for the Up to $2,000, you must open a new Citi Simplified Checking account and deposit at least $300,000 in new-to-Citibank funds within the first 20 days. (Details below pertain to the New York ZIP code of 10001.) However, Citi® bonus offers vary by ZIP code, and this promotion may not be available in your area. This Citi® promotion tops our ranking of the best bank bonuses and is one of the biggest checking account offers on the market.