A taxpayer has a $500,000 mortgage on their primary residence and a $100,000 home equity line of credit (HELOC). They use the HELOC to pay for their child's college tuition. Is the interest on the HELOC deductible? If you answered "no" because home equity interest is no longer deductible, you've fallen for one of the most common oversimplifications tested on the exam. The real answer depends entirely on how the loan proceeds are used, a judgment test that separates passing candidates from the rest.
Itemized deductions are specific expenses taxpayers can subtract from their adjusted gross income (AGI) to lower their taxable income, but only if the total exceeds their standard deduction. For the CPA exam, you must master the limitations for medical expenses, state and local taxes (SALT), mortgage interest, and charitable contributions.
Key facts
- Official Body: American Institute of Certified Public Accountants (AICPA)
- Exam Section: Tax Compliance & Planning (TCP)
- SALT Deduction Cap: $10,000 per household ($5,000 MFS) under IRC §164(b)(6).
- Acquisition Debt Limit: Interest on up to $750,000 of mortgage debt used to buy, build, or improve a home is deductible under IRC §163.
- Medical Expense Floor: Deductible only to the extent qualified expenses exceed 7.5% of AGI (IRC §213).
- Investment Interest Limit: Investment interest expense is deductible only up to the amount of net investment income.
The AICPA reports the pass rate for the TCP discipline section was 58.76% in Q1 2024 (AICPA). This rate reflects a self-selected group of candidates; overconfidence in foundational topics like this is a significant risk.
What Are Itemized Deductions vs. the Standard Deduction?
Itemized deductions are specific, eligible expenditures that the Internal Revenue Code allows you to subtract from your Adjusted Gross Income (AGI). The core decision for a taxpayer, and the first step in any exam problem, is choosing between itemizing or taking the standard deduction. You advise taking whichever results in a larger deduction and therefore a lower tax liability.
Studying for CPA TCP? Benchmark your score in 5 minutes.
Get an instant weak-spot assessment and a custom 12-week study plan PDF generated for your exam window.
On the TCP exam, this isn't a simple list-and-sum exercise. The questions are designed to test your professional judgment on the complex limitations, AGI-based floors, and specific exceptions that govern these deductions. You will face both multiple-choice questions (MCQs) on individual rules and Task-Based Simulations (TBS) that require you to analyze a client's entire financial picture to determine their optimal tax strategy.
The most dangerous error is memorizing a rule without understanding its application. Memorizing "the SALT cap is $10,000" is useless if you can't distinguish a non-deductible foreign property tax from a deductible state income tax. The exam tests your ability to apply these rules to messy, real-world fact patterns. You can test your skills with thousands of TCP practice questions on VoraPrep.
A Practitioner's Decision Tree for Major Itemized Deductions
To pass, you must think through these deductions systematically. Use this decision-tree approach for each major category you encounter in an exam question.
Medical Expenses (IRC §213)
The high AGI floor makes this deduction difficult to claim, which is why examiners test it.- Step 1: Is the expense qualified? This includes costs for diagnosis, treatment, or prevention of disease, plus prescription drugs and health insurance premiums paid with after-tax dollars. Purely cosmetic procedures are excluded.
- Step 2: Calculate the AGI floor. Multiply the taxpayer's AGI by 7.5% (0.075).
- Step 3: Determine the deductible amount. Your deduction is the total of qualified expenses minus the 7.5% AGI floor. If the result is negative, the deduction is zero.
State and Local Taxes (SALT) (IRC §164(b)(6))
The $10,000 cap is the most famous rule here, but the exam tests the details of what goes into that calculation.- Step 1: Choose income or sales tax. A taxpayer can deduct either their state and local income taxes OR their state and local general sales taxes. They cannot deduct both.
- Step 2: Add qualifying property taxes. This includes state and local real estate taxes on property held for personal use, like a primary or vacation home.
- Step 3: Apply the hard cap. The total combined deduction for all state and local taxes (income/sales + property) is capped at $10,000 per household ($5,000 if married filing separately).
> ⚠️ Exam trap: > A simulation gives you a client's property tax bill for their primary residence ($8,000) and their rental property ($5,000). A panicked candidate adds them together ($13,000) and incorrectly caps the deduction at $10,000 on Schedule A. The correct answer is to deduct $8,000 toward the SALT limit on Schedule A and deduct the full $5,000 rental property tax on Schedule E. The exam preys on this distinction.
Home Mortgage Interest (IRC §163)
This is the most nuanced area. The key is to follow the money.- Step 1: Was the debt used to buy, build, or substantially improve a home? This is the definition of "acquisition indebtedness." The name of the loan (e.g., "mortgage" vs. "HELOC") does not matter. If the proceeds were used for acquisition, the interest may be deductible. If used to pay for tuition or a car, it is non-deductible personal interest.
- Step 2: Apply the principal limitation. Interest is only deductible on up to $750,000 of total acquisition indebtedness ($375,000 MFS) for loans originated after December 15, 2017. For older loans, the limit is $1 million.
- Step 3: How were points handled? Points paid to obtain an original mortgage on a principal residence are generally fully deductible in the year paid. Points paid to refinance a mortgage must be amortized over the life of the new loan.
Charitable Contributions (IRC §170)
This deduction is governed by AGI limitations that depend on the property type and the recipient organization.| Contribution Type | Recipient Charity | Deduction Amount | AGI Limitation |
|---|---|---|---|
| Cash | Public Charity | Amount of Cash | 60% of AGI |
| Ordinary Income Property | Public Charity | Lesser of FMV or Basis | 50% of AGI |
| Long-Term Capital Gain Property | Public Charity | Fair Market Value (FMV) | 30% of AGI |
| Cash | Private Non-Operating Foundation | Amount of Cash | 30% of AGI |
Other Key Itemized Deductions
While the "big four" are most common, the exam can test these as well.- Investment Interest Expense: You can deduct interest paid on loans used to purchase investments (e.g., margin interest), but the deduction is limited to your net investment income for the year.
- Gambling Losses: These are deductible, but only to the extent of your gambling winnings from the same year.
- Casualty and Theft Losses: Post-TCJA, these are only deductible for personal-use property if the loss occurred in a federally declared disaster area.
Worked Example: A Comprehensive Itemized Deduction Simulation
Let's apply these decision trees to a multi-step exam problem.
> 💡 Worked example: > Maria and David, a married couple, are preparing their 2026 joint tax return. They have an AGI of $250,000. They provide you with the following: > - State income taxes paid: $8,000 > - Property taxes on their primary residence: $7,000 > - Unreimbursed doctor bills and health insurance premiums: $20,000 > - Mortgage interest on a $700,000 loan (orig. 2022) to buy their home: $31,000 > - Cash donation to a public charity: $18,000 > > Calculate their total itemized deductions for 2026.
Check Your State’s Exact CPA Exam Requirements
Every state has different credit hour, ethics, and residency rules. Use our 55-jurisdiction checker to verify your eligibility before applying.
Step 1: Calculate the Medical Expense Deduction
First, determine the AGI floor: $250,000 AGI * 7.5% = $18,750. Their qualified expenses ($20,000) exceed this floor.- Medical Deduction = $20,000 (Expenses) - $18,750 (Floor) = $1,250
Step 2: Calculate the State and Local Tax (SALT) Deduction
Sum their state and local taxes: $8,000 (income) + $7,000 (property) = $15,000. Now, apply the cap from IRC §164(b)(6). The maximum is $10,000.- SALT Deduction = $10,000
Step 3: Calculate the Home Mortgage Interest Deduction
Their mortgage is for $700,000 and was taken out in 2022. This is acquisition indebtedness. Since the loan is below the $750,000 principal limit, all interest is deductible.- Mortgage Interest Deduction = $31,000
Step 4: Calculate the Charitable Contribution Deduction
They donated $18,000 in cash to a public charity. The AGI limitation is 60% of AGI.- AGI Limitation = $250,000 (AGI) * 60% = $150,000
Since their $18,000 contribution is far below the limit, it's fully deductible.
- Charitable Contribution Deduction = $18,000
Step 5: Sum the Deductions and Compare
Finally, add up the individual deductions to find the total.- Total Itemized Deductions = $1,250 + $10,000 + $31,000 + $18,000 = $60,250
The 2026 standard deduction for a married couple is projected to be $30,700. Since $60,250 is greater, they will itemize. The VoraPrep adaptive engine has thousands of problems like this to build the judgment and speed you need.
How to Approach Itemized Deduction Questions on Exam Day
Knowing the rules is half the battle; executing under pressure is the other half.
- Connect to AGI: Always remember that medical and charitable deductions depend on AGI. A simulation might require you to first calculate AGI (e.g., by accounting for a self-employment tax deduction) before you can even begin your Schedule A calculations. This is a common multi-step trap.
- Time Allocation: Do not spend more than 90 seconds on a standard MCQ. If a question requires calculating multiple AGI limitations and comparing them, it's a time sink. Flag it, make your best guess, and move on. You can come back if you have time.
- Final Week Review: In your final review week, create a one-page summary sheet of the key thresholds: 7.5% for medical, $10,000 for SALT, $750,000 for mortgage debt, and the 60%/30%/50% AGI limits for charity. If you're stuck on a concept, ask Vory, your 24/7 AI tutor, for an immediate explanation.