Why is the cost of living deduction 12000 when i paid 14000 alone in just rent

[DoninGA]

The Federal Standard Deduction is based on your filing status and age.  It is not based on individual expenses.

Standard deductions for 2019

• Single - $12,200 add $1,650 if age 65 or older
• Married Filing Separately - $12,200 add $1,300 if age 65 or older
• Married Filing Jointly - $24,400 add $1,300 for each spouse age 65 or older
• Head of Household - $18,350 add $1,650 if age 65 or older