What Is the Standard Deduction?
Every candidate knows the amounts. The exam doesn’t ask for the amounts. It asks which taxpayer loses the deduction, which extra amount rides with it, and which one sits on a line of its own — and Part 1, Domain 3 quietly harvests points from people who never noticed the difference.
Try It First
Answer before you read on. Three separate rules are hiding in one sentence.
For tax year 2025, a single taxpayer age 68 itemizes deductions. Her Schedule A total is $19,000 and her MAGI is $60,000. Which statement is correct?
- A. She adds the $2,000 additional standard deduction to her $19,000 of itemized deductions.
- B. She claims the $6,000 senior deduction on top of her $19,000 of itemized deductions.
- C. She forfeits the $6,000 senior deduction because she itemized.
- D. She reports the $6,000 senior deduction inside her Schedule A total.
Hold your answer. It’s revealed in section 5, with the citations.
Key Takeaways
- Standard or itemized — larger of the two, never both. The exam tests the word larger, not the arithmetic.
- Married filing separately: once one spouse itemizes, the other spouse’s standard deduction drops to $0. That’s a forced result, not a choice.
- The §63(f) additional amount for age 65 or blindness rides only with the standard deduction. Itemize and it’s gone.
- The OBBBA $6,000 senior deduction survives itemizing. It isn’t an itemized deduction and never belongs in a Schedule A total.
- A nonresident alien can’t take the standard deduction. A dependent gets one, but a shrunken one.
- All figures here are tax year 2025 — the law your 2026 testing-cycle exam is written against.
Table of Contents
1. Where the Standard Deduction Actually Sits
You’ve already found AGI. One subtraction stands between AGI and taxable income, and §63 gives the taxpayer two ways to make it: a flat amount set by filing status, or the real expenses added up on Schedule A. Whichever comes out larger. Not both.
That’s the whole floor. Memorize the amounts and move on, because the exam rarely stops here.
| Filing Status | Standard Deduction — TY2025 |
|---|---|
| Single | $15,750 |
| Married Filing Jointly / Qualifying Surviving Spouse | $31,500 |
| Head of Household | $23,625 |
| Married Filing Separately | $15,750 |
Tax year 2025 amounts as adjusted by the One Big Beautiful Bill Act (IR-2025-103). These are the figures your 2026-cycle exam uses.
How the exam actually asks it
Almost never “what is the amount for a single filer.” Far more often: who gets it, who loses it, and which extra amount stacks. Rules, not arithmetic. Watch for that shape in every Domain 3 question you drill.
2. Trap One — The MFS Matching Rule
Two spouses file separately. One of them itemizes. What happens to the other?
Most candidates reach for something reasonable — half the amount, or free choice, or the full standard deduction since it’s a separate return and a separate person. Every one of those is wrong. Under §63(c)(6), the second spouse’s standard deduction becomes $0. Zero. Which leaves itemizing as the only door left, even if that spouse’s Schedule A total is $400.
Notice what the statute did there. It didn’t say the spouses must agree. It set one spouse’s number to zero and let arithmetic do the rest. Distractors on this question are built to sound fair — and the rule isn’t about fairness.
Where I meet this rule off the exam
A separated couple, still legally married, no communication. One spouse files early and itemizes $8,200. The other spouse — a renter with nothing to itemize — walks in expecting $15,750 and gets $0. Nothing to fix, nothing to elect. That’s the entire conversation. The exam question and the client meeting are the same rule wearing different clothes, and that’s why this one sticks once you’ve lived it.
3. Trap Two — Taxpayers Who Can’t Take It (and One Who Barely Can)
A short list, and the exam works it hard. No standard deduction for:
- A nonresident alien or dual-status alien — itemizing is the only option (§63(c)(6))
- A married person filing separately whose spouse itemizes — section 2 above
- Someone filing a short-year return after changing accounting periods
- An estate, trust, common trust fund, or partnership
The nonresident alien item is the one worth a second look, because it’s the one candidates half-remember. There’s a treaty carve-out for certain students and business apprentices from India, and the exam has been known to reward knowing that the general rule has an exception at all.
The dependent gets a deduction — a small one
A dependent isn’t shut out. Under §63(c)(5), the dependent’s standard deduction is the greater of $1,350 or earned income plus $450, capped at the regular amount for that filing status. For TY2025, that cap is $15,750 for a single dependent.
| Dependent’s Earned Income | Greater-Of Test | Standard Deduction |
|---|---|---|
| $0 (interest income only) | $1,350 vs. $450 | $1,350 |
| $4,000 summer job | $1,350 vs. $4,450 | $4,450 |
| $40,000 | $1,350 vs. $40,450 — cap applies | $15,750 |
Three chances to slip: forgetting the $450 add-on, forgetting the floor, forgetting the ceiling. Question writers pick one of the three and build the distractors around it. Run the greater-of test in full every single time, even when the answer looks obvious.
4. Trap Three — Two Different Age-65 Deductions
Here’s the one that decides your Try It question, and the one I’d bet on showing up in some form on your exam.
A taxpayer turns 65. Two separate deductions come into view. They look like relatives. They behave nothing alike.
The §63(f) additional standard deduction
An add-on for each qualifying condition — age 65 or older, and blindness, counted separately. For TY2025: $2,000 per condition for single and head-of-household filers, $1,600 per condition, per person for married filers. Someone who is both 65 and blind counts twice. A single filer in that position adds $4,000.
The word that matters: additional. Additional to what? To the standard deduction. Pull the standard deduction away and there’s nothing left for it to attach to. An itemizer never sees this amount.
The OBBBA senior deduction
A different animal entirely. $6,000 per person age 65 or older, temporary for tax years 2025 through 2028, $12,000 on a joint return when both spouses qualify. It phases out at 6 cents per dollar of MAGI above $75,000 (single) or $150,000 (joint), disappearing at $175,000 — and at $350,000 for a joint return where both spouses are 65 or older.
And it doesn’t care whether you itemize. It sits on its own line, outside Schedule A, and an itemizer claims it in full. That single fact is the entire point of the exam question.
| Additional Standard Deduction §63(f) |
Senior Deduction OBBBA §70103 |
|
|---|---|---|
| Amount (TY2025) | $2,000 single/HoH · $1,600 married per condition |
$6,000 per person $12,000 MFJ, both 65+ |
| Survives itemizing? | No | Yes |
| Income phase-out? | None | 6% above $75,000 / $150,000 |
| Part of Schedule A? | No | No — its own line |
| Permanent? | Yes | No — 2025 through 2028 |
⚠ Exam Trap
Four ways this gets weaponized:
- Treating the two deductions as one thing — they’re separate statutes with separate rules.
- “An itemizer loses the $6,000 senior deduction.” False, and it’s the most common wrong answer.
- “An itemizer keeps the $2,000 additional standard deduction.” Also false, and it’s the mirror image of the first.
- A question asking for total itemized deductions. The $6,000 is not an itemized deduction. Keep it out of that number.
🧮 Which Line Does It Sit On? — TY2025 Stacking Check
Flip the “itemize” switch and watch which amount survives. That’s the whole exam trap in one control.
Qualifying conditions
| Base standard deduction | — |
| Additional standard deduction §63(f) | — |
| Senior deduction OBBBA §70103 | — |
| Total subtracted from AGI | — |
Study tool for TY2025 concepts only. Not a filing calculator, and not tax advice.
5. The Answer
Answer: B
She’s 68 and she itemizes $19,000. The OBBBA senior deduction doesn’t attach to the standard deduction, so itemizing costs her nothing there — and her MAGI of $60,000 sits below the $75,000 threshold, so she claims the full $6,000. It goes on its own line, on top of the $19,000.
A — the $2,000 under §63(f) is an additional standard deduction. She isn’t taking a standard deduction. Nothing to add it to.
C — the trap the exam wants. Itemizing kills the §63(f) amount, not the $6,000.
D — the $6,000 isn’t an itemized deduction. Fold it into Schedule A and every downstream number breaks.
Source: IRC §63(c), §63(f); OBBBA §70103. Tax year 2025.
Why this one question is worth four
Getting to B meant clearing three separate rules — that §63(f) rides with the standard deduction, that §70103 doesn’t, and that neither one belongs on Schedule A. Miss any single one and you land on A, C, or D. That’s how Domain 3 is built: one stem, several rules stacked, one wrong turn is enough. When you drill, don’t stop at “I got it right.” Ask which rules the other three choices were testing.
6. EA Insight — What This Looks Like at My Desk
A retired widow, 71, came in with a Schedule A total of $21,400 — most of it property tax on a house she’s owned since the eighties, plus a chunk of medical. Her draft return, prepared elsewhere, itemized correctly. It also left the $6,000 sitting on the table. The preparer had reasoned it the way half of my study group once reasoned it: she itemized, so the “senior amount” was out.
I didn’t argue it. I drew two lines on a legal pad — one labeled §63(f), one labeled §70103 — and put an X through the first. Her face changed in about four seconds. $6,000 off the top of a return that was otherwise finished.
Now the part that matters for your exam. That preparer wasn’t careless. He was pattern-matching — “extra deduction for old people” is one bucket in his head, and both amounts fell into it. That’s the identical failure that loses you a point in the testing center, and the exam writers know it, which is why the answer choices are worded to feel like the bucket is real.
So my habit, at the desk and on the exam: when a deduction shows up, I don’t ask how much. I ask which line. Above AGI, or below? Attached to the standard deduction, or standing alone? Inside Schedule A, or outside it? Domain 3 pays for that question far more often than it pays for a dollar figure.
7. People Also Ask
Which tax year figures does the EA exam use?
The exam closes each spring so questions can be updated, which means your exam tests the law in place at the end of the prior year. The 2026 testing cycle — exams from July 1, 2026 through February 28, 2027 — uses tax year 2025. Study TY2025 numbers and let the TY2026 figures wait until you’re preparing returns.
Do I need to memorize the standard deduction amounts?
Know the four base figures and the two add-on amounts. Beyond that, spend your time on the rules — who’s excluded, what the MFS matching rule does, how the dependent calculation runs. Questions that turn on a rule outnumber questions that turn on a dollar amount by a wide margin in Domain 3.
Can a taxpayer take above-the-line adjustments and the standard deduction?
Yes, and this is a distinct trap worth naming. Adjustments under §62 — half of SE tax, HSA contributions, student loan interest, deductible IRA contributions — come out before AGI. The standard deduction comes out after. Different layers, no competition. “I take the standard deduction, so I can’t deduct anything else” is wrong at the desk and wrong on the exam.
Does a Schedule C business owner’s deductions affect the standard deduction?
No. Business expenses come off on Schedule C, above AGI. The standard deduction still applies in full afterward. A sole proprietor deducting $30,000 of business expenses also takes the $15,750 — these numbers never touch.
Is the $6,000 senior deduction going away?
It’s written for tax years 2025 through 2028 unless Congress extends it. The exam has tested the temporary nature of it directly — a question stating that it applies “only to tax years 2025 through 2028” is a true statement, not a distractor. Know the window.
Do this today
Open a blank page and write down every deduction you’ve studied so far — standard, §63(f) additional, the $6,000 senior, SALT, mortgage interest, half of SE tax, student loan interest, charitable. Then sort them into three columns: above AGI, rides with the standard deduction, on Schedule A. Anything that won’t fit a column is a gap. Go fill it before you drill another question set.
Related Articles
Official Resources
Tax year covered: 2025 (2026 EA testing cycle — exams from July 1, 2026 through February 28, 2027)
This article is for educational purposes only and does not constitute tax, legal, or financial advice. Practice questions are original works written by the author and are not actual exam questions. This is an independent publication, not affiliated with, sponsored by, or endorsed by the IRS or PSI Services. Tax law and exam content change; always confirm current figures at IRS.gov and current exam details at the IRS and PSI websites.