Outline the specific rules and limitations surrounding the deductibility of medical expenses, including the percentage of adjusted gross income (AGI) threshold that must be met.

The deductibility of medical expenses is governed by specific rules and limitations, primarily revolving around the concept of an adjusted gross income (AGI) threshold that must be met before a deduction can be claimed. Medical expenses, generally speaking, are deductible if they are incurred for the diagnosis, cure, mitigation, treatment, or prevention of disease, or for the purpose of affecting any structure or function of the body. This encompasses costs for healthcare providers, necessary medical equipment, and certain types of insurance premiums. However, not all medical expenses are deductible. The IRS allows a deduction only for the amount of qualified medical expenses that exceed a certain percentage of your adjusted gross income. The key limitation for deducting medical expenses is that they must exceed 7.5% of your AGI. Adjusted Gross Income is your gross income less specific deductions like contributions to traditional IRA's, health savings account deductions, and student loan interest. This AGI is not your total income but your gross income as reduced by certain specific deductions. Once you have your AGI, you can calculate the 7.5% threshold that must be exceeded to deduct your medical expenses. If your medical expenses do not exceed this 7.5% threshold, then you cannot deduct any medical expenses on your tax return. For instance, consider a taxpayer wi....