You are required to provide bank statements for accounts that are used to pay for a down payment, that show proof of the reserves required for the mortgage or if income from an account is used to qualify for a mortgage. For example, if you intend to use funds in a savings account to pay for your down payment on a home, lenders typically require that you provide two months of bank statements for that account to verify your source of funds. Please note that most lenders require that down payment funds are "seasoned" or held in a bank account for two-to-three months before you apply for a mortgage. So if you plan on transferring funds from one account to another to pay for a down payment, keep this "seasoning" requirement in mind.
Additionally, if you generate dividend or interest income from an investment account and you want to use that income to qualify for a mortgage, lenders require that you provide at least two months of statements for the investment account.
For borrowers with multiple bank or investment accounts, you typically are not required to provide statements for accounts that are not directly related to your mortgage application. For example, you may have a savings or brokerage account that does not hold the funds that you intend to use for your down payment or mortgage reserves. In this case, you likely would not be required to provide statements for those accounts because the funds held in the accounts are not being used to qualify for the mortgage or complete the home purchase.
Guidelines on the documents required for a mortgage can vary so we recommend that you consult multiple lenders in advance of submitting your application.