Only the IRS knows. The IRS usually announces the start of the tax filing season (last year it was Jan 22, 2017) but they have not announced any 2018 date yet. Hopefully it will be in late January and the form available by then. (A few years ago when Congress make late year tax law changes, some forms were not ready until late March).
The tax law that affects the medical deduction was just signed into law (makes it 7.5% of AGI for everyone). The official IRS Schedule A is still the 2016 version. Until the IRS publishes the 2017 version with the changes and then issues the 2017 e-fileing specifications for Schedule A to tax software companies (like TurboTax) the form cannot be finalized. Everyone is waiting for the IRS.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
