How to calculate interest income/dividends when there is no 1099-INT and 1099-DIV

So, I recently came across another post in this forum that said interest income must be reported, even if under $10: Solved: Do I need to report interest less than $10 to IRS and indicate on 1040? (intuit.com)

 

The IRS also alludes to this: "You must report all taxable and tax-exempt interest on your federal income tax return, even if you don't receive a Form 1099-INT or Form 1099-OID"

Topic no. 403, Interest received | Internal Revenue Service (irs.gov)

 

  • But how do I calculate interest income, for something like last year's Tax Returns?  Is it just Actual Return Received - Expected Return?
  • For dividends, am I just manually adding up all the dividends I receive from all the shares/fractional shares that I own in Robinhood?