After you file

Did you look for it in the Federal section as noted by @VolvoGirl?

1. In TurboTax Online, go to  Deductions and Credits.
2. Scroll down to Other Deductions and Credits and click to open that section.
3. Alimony Paid is one of the items in the list. Click Start next to Alimony Paid to enter your information.

See this TurboTax article for more information.

Generally, alimony or separate maintenance payments are deductible by the payer spouse and includible in the recipient spouse's income on the Federal return if paid under a divorce or separation agreement executed before 2019. 

California doesn't conform to Federal law on this issue. See here for more information. Alimony is still deductible by the payer and reportable as income by the recipient on the California state return, if the agreement was entered into in 2019 or later. 

You can't deduct alimony or separate maintenance payments on the Federal return if made under a divorce or separation agreement (1) executed after 2018, or (2) executed before 2019 but later modified if the modification expressly states the repeal of the deduction for alimony payments applies to the modification.

Also, not all payments under a divorce or separation instrument are alimony or separate maintenance. Alimony or separate maintenance doesn't include:

• Child support,
• Noncash property settlements, whether in a lump-sum or installments,
• Payments that are your spouse's part of community property income,
• Payments to keep up the payer's property,
• Use of the payer's property, or
• Voluntary payments (that is, payments not required by a divorce or separation instrument).

See IRS Topic 452 or Publication 504 for more information.