20 C.F.R. § 404.1576
(b) Conditions for deducting impairment-related work expenses. We will deduct impairment-related work expenses if—
(c) What expenses may be deducted—(1) Payments for attendant care services.
(iii)
(4) Payments for equipment.
(5) Payments for drugs and medical services.
(iii) Payments for transportation costs. We will deduct transportation costs in these situations:
(e) How expenses are allocated—(1) Recurring expenses. You may pay for services on a regular periodic basis, or you may purchase an item on credit and pay for it in regular periodic installments or you may rent an item. If so, each payment you make for the services and each payment you make toward the purchase or rental (including interest) is deductible in the month it is made.
Example:B starts work in October 1981 at which time she purchases a medical device at a cost of $4,800 plus interest charges of $720. Her monthly payments begin in October. She earns and receives $400 a month. The term of the installment contract is 48 months. No downpayment is made. The monthly allowable deduction for the item would be $115 ($5520 divided by 48) for each month of work during the 48 months.
(2) Nonrecurring expenses. Part or all of your expenses may not be recurring. For example, you may make a one-time payment in full for an item or service or make a downpayment. If you are working when you make the payment we will either deduct the entire amount in the month you pay it or allocate the amount over a 12 consecutive month period beginning with the month of payment, whichever you select.
Example:A begins working in October 1981 and earns $525 a month. In the same month he purchases and pays for a deductible item at a cost of $250. In this situation we could allow a $250 deduction for October 1981, reducing A's earnings below the SGA level for that month. If A's earnings had been $15 above the SGA earnings amount, A probably would select the option of projecting the $250 payment over the 12-month period, October 1981-September 1982, giving A an allowable deduction of $20.83 a month for each month of work during that period. This deduction would reduce A's earnings below the SGA level for 12 months.
(3) Allocating downpayments. If you make a downpayment we will, if you choose, make a separate calculation for the downpayment in order to provide for uniform monthly deductions. In these situations we will determine the total payment that you will make over a 12 consecutive month period beginning with the month of the downpayment and allocate that amount over the 12 months. Beginning with the 13th month, the regular monthly payment will be deductible. This allocation process will be for a shorter period if your regular monthly payments will extend over a period of less than 12 months.
Example 1.C starts working in October 1981, at which time he purchases special equipment at a cost of $4,800, paying $1,200 down. The balance of $3,600, plus interest of $540, is to be repaid in 36 installments of $115 a month beginning November 1981. C earns $500 a month. He chooses to have the downpayment allocated. In this situation we would allow a deduction of $205.42 a month for each month of work during the period October 1981 through September 1982. After September 1982, the deduction amount would be the regular monthly payment of $115 for each month of work during the remaining installment period. Explanation: Downpayment in 10/81 $1,200 Monthly payments 11/81 through 09/82 1,265 12) 2,465 = $205.42
Example 2.D, while working, buys a deductible item in July 1981, paying $1,450 down. However, his first monthly payment of $125 is not due until September 1981. D chooses to have the downpayment allocated. In this situation we would allow a deduction of $225 a month for each month of work during the period July 1981 through June 1982. After June 1982, the deduction amount would be the regular monthly payment of $125 for each month of work. Explanation: Downpayment in 07/81 $1,450 Monthly payments 09/81 through 06/82 1,250 12) 2,700 = $225
(f) Limits on deductions.
[48 FR 21936, May 16, 1983]