IRS will use the same bank account on your file to send money

Do I need to let the IRS know where to send payment?

No. For people who have already filed their 2019 tax returns, the IRS will use this information to calculate the payment amount. For those who haven't filed a 2019 return, the IRS will use information from their 2018 tax filing to calculate the payment. The economic impact payment will be deposited directly into the same banking account reflected on the return filed.