The surgery may qualify as a medical expense deductible on Schedule A if your doctor has confirmed in writing that your weight is a threat to your health and ordered the surgery. Depending on the cost of the surgery, what other deductions you have and if your standard deduction is higher than all of your itemized deductions combined, the surgery may not help you in receiving a larger refund or a smaller balance due. Medical costs are deductible only after they exceed 7.5 percent of your Adjusted Gross Income (AGI) in 2017 and 2018. So if your AGI is $50,000, the first $3,750 ($50,000 x 0.075) of unreimbursed medical expenses doesn't count.
If your return has already been efiled and accepted, you will need to amend your tax return in order to add the gastric sleeve surgery. See link below that explains how to amend your return using TurboTax:
See the TurboTax Blog link below that explains more about weight loss and taxes:
Is
your weight loss tax deductible?
What Medical Expenses are deductible?
https://ttlc.intuit.com/replies/4774889
How to amend return?
https://ttlc.intuit.com/replies/5114064
