You are correct, you can deduct this. Be aware that payroll tax still applies when you make a personal contribution. If you contributed via your paycheck, then it would be payroll tax free also. Just a note, in case you'd like to update your paycheck contributions in the future.
Here is how to navigate to make the entry:
- Click on Federal Taxes, Deduction & Credits
- Choose HSA, MSA Contributions
- Continue until you see a page titled "Let's enter (your name's) HSA contributions" which will show any deductions already computed from your W-2 in a box that is greyed out, and another box for contributions you personally made.
- Enter the amount you personally made.
For some more information, see Basics of Health Savings Accounts
