Don't think of it as dividends. The Dividends stay in the account and are not currently taxable. If you happen to take out the same amount that would be a plain Distribution. As long as you take out the RMD amount or more.
And only Up to 85% of Social Security becomes taxable when all your other income plus 1/2 your social security, reaches:
Married Filing Jointly: $32,000
Single or head of household: $25,000
Married Filing Separately: 0
So only 85% of 25,000 = 21,250 would be taxable at most.
Then you get to subtract the Standard Deduction from your total income to get the Taxable income. Plus you get an extra amount for being over 65.
For 2021 the standard deduction amounts are:
Single 12,550 + 1,700 for 65 and over or blind (14,250)
HOH 18,800 + 1,700 for 65 and over or blind
Joint 25,100 + 1,350 for each 65 and over or blind
Married filing Separate 12,550 + 1,350 for 65 and over or blind
