Welcome to Your Guide to Individual Tax Compliance & Planning!
Hello there! If you’ve ever looked at a tax return and felt like you were reading a foreign language, don't worry—you aren't alone. This chapter is the "Heart" of the TCP exam. We are going to learn how a person’s total income is filtered through various rules to reach the final number the government actually taxes. Think of this process like a funnel: a lot goes in at the top, but thanks to planning and specific rules, a much smaller amount comes out at the bottom to be taxed.
By the end of these notes, you’ll understand the "Tax Formula," how to lower a client's tax bill through smart planning, and how to keep them out of trouble with the IRS by paying the right amount of estimated taxes.
Did you know? The U.S. tax system is "pay-as-you-go." The government doesn't like waiting until April 15th to get its money; they want it as you earn it!
1. The Starting Point: Gross Income
Before we can calculate tax, we have to know what counts as "income." In the eyes of the IRS, Gross Income includes all income from whatever source derived, unless the law specifically says it’s exempt.
What’s In? (Inclusions)
Most things are included in gross income. This includes:
• Wages and Salaries (The most common form).
• Interest and Dividends (Money earned from savings or stocks).
• Business Income (Profit from a side hustle or sole proprietorship).
• Capital Gains (Profit from selling an asset like a stock or a home).
• Rents and Royalties.
What’s Out? (Exclusions)
Tax planning often involves maximizing these "exclusions" because this is money you receive that is never taxed.
• Life Insurance Proceeds: Usually tax-free to the beneficiary.
• Gifts and Inheritances: The person receiving the gift generally pays no income tax.
• Municipal Bond Interest: Interest earned on bonds issued by state or local governments is typically excluded from federal tax.
Example: If Sarah receives a \$10,000 gift from her grandmother and earns \$500 in interest from a City of Chicago bond, her Gross Income from these items is \$0.
Key Takeaway:
Gross income is the "top of the funnel." Unless there is a specific rule saying "this isn't taxed," you should assume it is part of Gross Income.
2. Adjusted Gross Income (AGI): The "Magic Number"
Adjusted Gross Income (AGI) is perhaps the most important number on a tax return. It acts as a "line in the sand." Deductions taken before reaching AGI are called Adjustments to Income (or "Above-the-Line" deductions).
Why AGI Matters
AGI is used as a threshold for many other tax benefits. For example, some deductions are only allowed if they exceed a certain percentage of your AGI. Therefore, lowering AGI is a primary goal in tax planning.
Common Adjustments (Above-the-Line)
These are "better" than other deductions because everyone who qualifies can take them, regardless of whether they itemize.
• Health Savings Account (HSA) Contributions: Encourages saving for medical costs.
• Student Loan Interest: Up to \$2,500 (subject to phase-outs).
• IRA Contributions: Traditional IRA contributions can often be deducted.
• Self-Employment Tax: Half of the self-employment tax paid is deductible.
Quick Review Box:
Formula: \( \text{Gross Income} - \text{Adjustments} = \text{AGI} \).
Planning Tip: Always look for ways to reduce AGI first, as it can "unlock" other tax breaks.
3. Determining Taxable Income
Once we have the AGI, we need to subtract more items to get to Taxable Income. This is where we choose between the Standard Deduction and Itemized Deductions.
Standard vs. Itemized: The Great Choice
Eligible taxpayers generally compare the standard deduction with allowable itemized deductions. Eligibility exceptions matter: for example, a married-filing-separately taxpayer generally cannot use the standard deduction if the spouse itemizes; nonresident aliens generally cannot claim it either. Use the applicable year and filing status rather than assuming an unrestricted choice.
Common Itemized Deductions
For 2026, itemized deductions include eligible charitable gifts (subject to a 0.5%-of-AGI floor and applicable percentage limits), medical costs above 7.5% of AGI, qualified mortgage interest, and eligible taxes and casualty losses. The SALT cap is $40,400 ($20,200 married filing separately), reduced by 30% of MAGI above $505,000 ($252,500 separately), but not below $10,000 ($5,000 separately). Personal casualty losses generally require a federally or state-declared disaster, subject to applicable exceptions and limitations. Do not use an unconditional $10,000 SALT cap or a federal-disaster-only rule for 2026.
The QBI Deduction (Section 199A)
After subtracting the standard or itemized deduction, business owners might get one more "bonus" deduction: the Qualified Business Income (QBI) Deduction. This is generally 20% of qualified business income from a "pass-through" entity (like a partnership or S-Corp), subject to various limits based on income levels.
For 2026, start with AGI and subtract the allowable standard or itemized deduction, the allowable QBI deduction and other applicable deductions below AGI. Schedule 1-A provides deductions for qualified tips, qualified overtime, qualifying car-loan interest and eligible seniors, each with its own limits and conditions; these do not reduce AGI. Eligible nonitemizers may also deduct up to $1,000 of qualifying cash charitable gifts ($2,000 jointly). Do not assume the standard/itemized deduction and QBI are the only deductions.
Key Takeaway:
Taxable income is the final amount used to calculate the actual tax owed using the IRS tax brackets. The lower this number, the lower the tax!
4. Estimated Taxes: Paying as You Go
As mentioned, the IRS wants its money throughout the year. If a taxpayer's employer doesn't withhold enough tax, or if they are self-employed, they must make Estimated Tax Payments quarterly.
The Safe Harbor Rules
The general required annual payment is the smaller of 90% of current-year tax or 100% of prior-year tax; use 110% of prior-year tax when prior-year AGI exceeds $150,000 ($75,000 if the current filing status is married filing separately). The prior-year return must cover a full 12 months. Meet required installment deadlines using timely payments and applicable withholding or annualized-income rules: paying the annual total late does not automatically avoid an earlier installment penalty. Exceptions, including special farmer/fisher rules, can apply.
The general required annual payment is the smaller of 90% of current-year tax or 100% of prior-year tax; use 110% of prior-year tax when prior-year AGI exceeds $150,000 ($75,000 if the current filing status is married filing separately). The prior-year return must cover a full 12 months. Meet required installment deadlines using timely payments and applicable withholding or annualized-income rules: paying the annual total late does not automatically avoid an earlier installment penalty. Exceptions, including special farmer/fisher rules, can apply.
Common Mistake to Avoid:
Don't forget that "Total Tax" includes self-employment tax, not just income tax. When calculating estimated payments, you must account for both!
5. Tax Planning Considerations
Compliance is about following the rules; Planning is about using the rules to your advantage. There are three main strategies:
1. Timing Strategies
Timing strategies depend on the taxpayer’s accounting method, eligibility and statutory limits. An eligible charitable gift paid in December may accelerate a deduction. Prepaying interest attributable to a future period generally does not accelerate its deduction under section 461(g); qualifying points have separate rules. Do not promise an immediate deduction merely by paying a January mortgage installment in December.
2. Income Shifting
Moving income from a high-tax-bracket taxpayer (like a parent) to a lower-tax-bracket taxpayer (like a child), though you must be careful of the "Kiddie Tax" rules!
3. Character Shifting
Changing the type of income. For example, Long-term Capital Gains are taxed at lower rates (0%, 15%, or 20%) compared to Ordinary Income (which can go up to 37%). A smart planner helps clients hold assets for more than a year to get that lower rate.
Key Takeaway:
Good tax planning is proactive, not reactive. It happens during the year, not just when the return is being filed in April.
Quick Chapter Summary
For 2026, start with AGI and subtract the allowable standard or itemized deduction, the allowable QBI deduction and other applicable deductions below AGI. Schedule 1-A provides deductions for qualified tips, qualified overtime, qualifying car-loan interest and eligible seniors, each with its own limits and conditions; these do not reduce AGI. Eligible nonitemizers may also deduct up to $1,000 of qualifying cash charitable gifts ($2,000 jointly). Do not assume the standard/itemized deduction and QBI are the only deductions.
Don't worry if the specific dollar amounts for deductions feel overwhelming—the CPA exam often focuses more on the logic and application of these rules than on memorizing every single threshold. Keep practicing the flow of the tax formula!