S-corp owner with W2 - HSA contribution Box 12 or 14

12b code W needs to be on line 12 otherwise it will not flow to form 8889 which is required

it doesn't need to be on line 14.

do not change any amounts from what's on W-2,  if you do you will regret it when you start getting correspondence from the IRS and if you're due a refund, it being delayed.

box 3 and 5  - wages for social security and medicare purposes

box 1 box 3 ($60,000) less 12a - retirement contribution ($18,500)   plus - 14  S corp health insurance  ($12545) = taxable wages ($54,045)

box 16 talk to your employer.  

if you are a 2% or more shareholder in the S-Corp make sure you properly enter this amount using the quickzoom feature on the K-1 input screen  for health insurance  - under "final / amended"   .  you are entitled to a deduction for this amount

it does not flow  from box 14 but box 14 is where is supposed to be reported

I am single member S corp.

On W2 I have taken 70k as gross wage.

Out of this

22500 for solo 401k employee deferal shown on 12a D

7500 HSA from S corp shown as 12b W

2500 heath premium shown as 12c DD

So box 1 wage is 37500.

So does TurboTax will calculate how much employer Solo 401k contribution should be?

Is it 25% of 70k

Or

60k

Or

37500