Filing Single is an actual filing status and any questions about being divorced would be related to the ability to claim a dependent. You be able to either file as Single or Head of Household, if you qualify.
Also, if your son paid for over half of his own support (see below) during 2016, then you cannot claim him. The software does a really great job of determining who is a dependent. Just make sure to read all the blue text links.
You can read more about who qualifies to file as Head of Household, and
who is a qualifying person at this link:
https://ttlc.intuit.com/replies/3288637
Who Can I Claim as a Dependent?
https://ttlc.intuit.com/replies/5187060
Support includes:
- Food
- Lodging (even if your mortgage is paid off)
- Clothing
- Education (including the GI bill)
- Medical and dental care (including insurance and
supplementary Medicare premiums)
- Recreation
- Transportation and similar necessities
Support does not
include:
- Life insurance premiums
- Funeral expenses
- Federal, state, or local income taxes or Social
Security and Medicare taxes paid on a person's own income
- Scholarship grants
- Income made by a disabled person in a sheltered
workshop
