Final answer:
Melissa can deduct registration fees, accommodation, and other related expenses associated with her business travel on her tax return, with meals usually being 50% deductible.
Step-by-step explanation:
The deductible amount for Melissa's travel costs associated with business can be calculated by considering all the acceptable expenses that fall under her deductible. This includes registration fees, accommodation, meals, and other related expenses specifically tied to the business purpose of the trip. The deductible allows the policyholder, in the context of insurance, to pay a certain amount out-of-pocket before the insurance coverage begins to pay. However, in the context of taxes, a deductible expense is one that can be subtracted from income to reduce the taxable income. Therefore, Melissa can deduct these expenses on her tax return if they are ordinary and necessary for her business and if the primary purpose of the trip was business-related. Note that for meals, typically, only 50% of the cost is allowable as a deduction.