I'm changing from married filing jointly to married filing separately and Turbotax is asking if I lived with my spouse at certain dates. Why is it asking that?

To determine if you can be filing as Head of Household instead of the worst way to file when married, Married Filing Separately.

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