Some critics claim that payday lenders target the young and the poor, near military bases and in low-income communities, who may not understand the time value of money. Others go further, comparing payday lenders to loan sharks due to high interest rates-- typically 250% or more when annualized. There have been reported cases in which payday lenders have pursued criminal bad check charges, despite the fact that they (presumably) knew the check was bad at the time when it was written. Likewise, it is argued that the interest rates on payday lending (and on rent to own) unfairly disadvantage the poor, compared to the middle class who pay at most 25% or so on their credit cards.

Defenders of the higher interest rates note that payday loan processing costs do not differ much from their higher-principal, longer-term counterparts such as home mortgages. They argue that conventional interest rates at these lower dollar amounts and shorter terms would not be profitable. For example, a $100 one-week loan, at a 20% APR (compounded weekly) would only generate 38 cents of interest, which would fail to match loan processing costs.

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