John Baker, a cash-basis, calendar-year taxpayer, paid the following during the year.
Social security tax (withheld from wages): $4,500
Real estate taxes: $3,200
State income tax: $3,400
Special assessment for installation of sidewalks: $1,140
Penalty on tax underpayment: $300
Flat fee for automobile registration: $90
What itemized deduction may John claim for taxes on his return?