BRASILIA, Aug 7 (Reuters) - Brazil&aposs Senate approved on Thursday evening a bill to limit interest rates charged on credit card debt and overdraft lines, a move aimed at helping consumers suffering the fallout from the COVID-19 pandemic, but that could weigh on banks&apos 2020 profit.

Lawmakers proposed a cap of 30% per year on debt rolled over on credit cards and overdraft lines for all loans extended by banks from March until the end of state of emergency declared by Brazil&aposs government.

The current average interest rate for overdraft lines is 110% and for rolled-over credit card debt it stands at 300%.

Now Brazil&aposs lower house will vote on the bill.

Shares in Brazil&aposs biggest lenders, such as Banco Bradesco SA BBDC4.SA , Itau Unibanco Holding SA ITUB4.SA and Banco Santander Brasil SA SANB3.SA , all dipped more than 1%, underperforming the country&aposs stock exchange index, following the Senate&aposs approval of the bill.