Simon's net unearned income is $6,880. Simon's allocable parental tax is $561.60. Simon's total tax is $671.60.
How to find the taxes ?
For the 2020 tax year, the first $1,100 of a child's unearned income is not taxed due to the standard deduction for unearned income. The next $1,100 is taxed at the child's tax rate, and any unearned income above $2,200 is taxed at the parents' tax rate.
Simon's unearned income: $7,980
Less standard deduction for unearned income: $1,100
Net unearned income: $7,980 - $1,100
= $6,880
The parents' taxable income is $82,250. In 2020, for married filing jointly, this would likely put them in the 12% marginal tax bracket:
So, the allocable parental tax is $4,680 x 12%
= $561.60
Simon's total tax is the sum of the tax on $1,100 at his tax rate (likely 10% for 2020) plus the allocable parental tax.
Tax on $1,100 at Simon's rate: $1,100 x 10%
= $110
Add allocable parental tax: $110 + $561.6
= $671.60
Simon's total tax would be $671.60.