Banks' first-quarter profits are expected to get rough

• One example: Analysts expect a ramp-up of provisions for loan loss reserves. That's a sign the banks anticipate that borrowers won't be able to pay back loans.

By the numbers: The "big four" banks — JPMorgan Chase, Bank of America, Wells Fargo and Citibank — are estimated to collectively bring in profits of about $20 billion in Q1, roughly $6 billion less than the same time last year, according to FactSet.

The calendar: JPMorgan and Wells Fargo release results on Tuesday. Bank of America and Citi report on Wednesday. So do Morgan Stanley and Goldman Sachs.

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