Which year deduct medical expense for wheelchair van conversion- all in purchase year, or spread over life of loan payments?

[gromitjs]

Total vehicle cost $90k… $50k for standard van chassis, plus $40k to do wheelchair conversion features.   Purchase was entirely financed with $90k, 5 year loan.

I know only $40k (conversion cost) is allowed as a medical expense.  My question is what is the timing of that medical expense deduction? …

A) is the $40k deduction reported all in year of vehicle purchase, or

B) is the $40k deduction spread out over 5 years of loan payments ($8k per year)?

Normally medical expenses are deductible “in the year paid”, not in year service is provided.

So for medical equipment purchased via a loan, does the IRS consider “in the year paid” to be the actual vehicle purchase date (100% in year 1), or in year of loan payments (20% years 1 thru 5)?

[Mike9241 · Accepted solution]

this is from IRS PUB 502 Medical expenses

Car
You can include in medical expenses the cost of special
hand controls and other special equipment installed in a
car for the use of a person with a disability.
Special design. You can include in medical expenses
the difference between the cost of a regular car and a car
specially designed to hold a wheelchair.
Cost of operation. The includible costs of using a car for
medical reasons are explained under Transportation, 

See IRS PUB 502 https://www.irs.gov/pub/irs-pdf/p502.pdf 

I would also say the full cost is deductible as a medical expense in year the conversion is complete OR the year of purchase if ready-built.