A gross amount of $10,852.25 and a taxable amount of $18.90 indicates that the distribution consists of $10,833.35 of your original premiums being returned along with $18.90 of taxable earnings.
The calculation of the taxable amount of Social Security income depends on the amount of your other taxable income. It's not uncommon to see an increase in taxable Social Security income equal to 85% of the increase in your other income. In that case, an increase in regular income of $19 ($18.90 rounded up) would cause an increase in taxable Social Security income of $16.
