Interest Income – why ask who it belongs to?

In the section for reporting Interest Income, TurboTax asks who the interest “belongs” to.  I’m assuming TurboTax wants to know who are the legal owners of the account from which the interest income was generated. 

 

How does this information affect my income tax calculation if I file a joint return?  If it doesn’t impact a joint filer, in what situation does the information matter?

 

Thanks.