Chapter 6: Standard Deduction vs. Itemizing — The Real Decision Rule

This post is Chapter 6 of 14 of the book Keep More of What You Earn — a plain-English guide to US taxes.

Every filing season, someone asks me some version of: “I’m a homeowner, so I should itemize, right?” Or the reverse: “I rent, so I just take the standard deduction?” Both questions reveal the same misunderstanding — that this choice is about who you are. It isn’t. It’s about which number is bigger. That’s it. That’s the whole decision.

The rule: take whichever is larger

On your return, you get one of these — never both:

• The standard deduction: a flat amount based on filing status. No receipts, no listing, no questions. For 2026: $16,100 (single/MFS), $32,200 (MFJ/qualifying surviving spouse), $24,150 (head of household). If you’re 65 or older or blind, add $1,650 per qualifying person (MFJ) or $2,050 (single/HoH).
• Itemized deductions: the actual total of your eligible expenses, listed on Schedule A: state and local taxes (with a cap), mortgage interest, charitable donations, medical expenses above a threshold, and a few smaller items.

Decision rule: compute both; take the larger. About 90% of filers take the standard deduction. Your job is to check, not to assume.

One special 2026 note: even if you take the standard deduction, you can now also deduct up to $1,000 in charitable cash contributions ($2,000 if married filing jointly) as an above-the-line adjustment. Keep your donation receipts regardless.

What’s inside Schedule A: the four big categories

1. State and local taxes (SALT) — capped. State/local income taxes (or sales taxes, if higher) plus property taxes — but the total is capped at about $40,400 for 2026. The excess simply vanishes.

2. Mortgage interest — with limits. Interest on up to $750,000 of acquisition debt ($375,000 if married filing separately) on your primary and one second home. Home equity loan interest counts only if the money was used to buy, build, or improve the home.

3. Charitable contributions. Cash gifts to qualified charities: deductible up to 60% of AGI (excess carries forward up to five years). New for 2026: itemizers face a 0.5%-of-AGI floor on charitable deductions, and the tax benefit of itemized deductions is capped at a 35% rate for top-bracket filers.

4. Medical expenses — above 7.5% of AGI. Only the portion exceeding 7.5% of your AGI counts. AGI of $80,000 → the first $6,000 of medical costs buys you nothing; every dollar above $6,000 is deductible.

Example 1: The renter — standard deduction wins easily

Single Jamal from Chapter 1: renter, $85,000 income, 2026. His potential itemized deductions: state income tax ~$4,500; charitable gifts $1,200. Total: $5,700 — not even close to the $16,100 standard deduction. He takes the standard deduction and still claims the $1,000 nonitemizer charitable break above the line. Effective deduction total: $17,100.

Example 2: The homeowner couple — itemizing wins clearly

The Hendersons, married filing jointly, $160,000 combined income, 2026:

• Property tax: $16,000; State income tax: $11,000 → SALT $27,000 (under the cap — fully deductible)
• Mortgage interest: $13,500; Charitable cash gifts: $7,000
• Itemized total: $47,500 vs. standard deduction $32,200.

They itemize. The extra $15,300 of deductions, at their 22% marginal rate, saves $3,366 vs. the standard deduction. The math is always: excess over standard × marginal rate = savings from itemizing.

Example 3: The retired couple — the standard deduction strikes back

The Hendersons, 25 years later: both 68, retired, mortgage paid off, MFJ, $70,000 income. Itemized total: $14,000. Standard deduction: $32,200 + $1,650 × 2 (both 65+) = $35,500. Plus the senior bonus deduction: $6,000 × 2 = $12,000 above-the-line (2026, phasing out above $150,000 MAGI joint). Itemizing isn’t in the same zip code.

The bunching strategy: itemize every other year

Some filers sit near the standard deduction — close enough that timing decides the winner. Bunching: concentrate two years of flexible deductions into one year, itemize that year, and take the standard deduction the next.

Example: $28,000 in “fixed” deductions (SALT + mortgage interest) plus $6,000 annual charity. Without bunching: $34,000 itemized vs. $32,200 standard → itemize both years. Two-year total: $68,000. With bunching: give two years of charity ($12,000) in Year 1 via a donor-advised fund. Year 1 itemized: $40,000. Year 2: $0 charity, standard $32,200. Two-year total: $72,200 — $4,200 of extra deductions, worth $924 at 22%. Same giving, same taxes paid, nearly a thousand dollars saved purely from timing.

Who should consider bunching? Anyone whose itemized total lands within ~$10,000 above the standard deduction.

The SALT cap workaround (for business owners)

The pass-through entity tax (PTET) election, offered by most states: your S corporation or partnership elects to pay state income tax at the entity level. The business deducts that tax as an ordinary business expense (no cap — the SALT cap applies to individual itemized deductions, not business expenses), and you get a state credit for the tax paid. If you’re self-employed in a high-tax state and itemizing near the SALT cap, it’s the single highest-value conversation you can have with a tax pro. (More in Chapter 12.)

Giving smart: beyond writing checks

• Donor-advised funds (DAFs). Contribute once, deduct this year, direct grants to charities over future years. The bunching strategy’s best friend.
• Donating appreciated stock. Give $10,000 of stock you bought for $4,000 directly to a charity: deduct the full $10,000 and never pay tax on the $6,000 gain. Always donate the appreciated shares, not the post-sale cash.
• Qualified charitable distributions (QCDs). Once you’re 70½, send IRA money directly to charity — the distribution never touches your taxable income, and it counts toward your required minimum distribution.

The 10-minute annual test

1. Estimate your SALT (property tax + state income/sales tax), capped at ~$40,400.
2. Add mortgage interest from last year’s Form 1098.
3. Estimate charitable giving — and ask: could I bunch two years into this one?
4. Gut-check medical: was it a big year? Total it against 7.5% of AGI.
5. Compare the sum to your standard deduction.
6. If itemized wins by less than ~$5,000, price out bunching.
7. If you take the standard deduction, still track charity — the $1,000/$2,000 nonitemizer break needs receipts too.

Three rules that trip people up

1. Married filing separately: one itemizes, both itemize. If your spouse itemizes, you must itemize too — even if your itemized total is $0.

2. You can itemize federally and take the standard deduction on your state return (or vice versa) — they’re independent choices in most states. Run both.

3. The standard deduction isn’t always available to nonresident aliens, MFS spouses of itemizers, and estates/trusts.

Key takeaways

1. The rule is “whichever is larger” — not “homeowners itemize, renters don’t.” 2026 standard deductions: $16,100 / $32,200 / $24,150.
2. Schedule A’s big four: SALT (capped ~$40,400), mortgage interest ($750k debt limit), charity (60% AGI limit; new 0.5% floor for itemizers), medical (above 7.5% of AGI).
3. Savings = (itemized − standard) × marginal rate. Only the excess saves you money.
4. 2026’s new wrinkles: nonitemizers can deduct up to $1,000/$2,000 in charity above the line; itemizers face a 0.5%-of-AGI charitable floor; top-bracket filers’ itemized benefit capped at 35%.
5. Bunching beats the line. Concentrate two years of charitable giving into one (donor-advised funds help), itemize that year, standard the next.
6. Retirees: check the senior math. The 65+ additional amounts plus the $6,000 senior bonus deduction make the standard deduction very hard to beat once the mortgage is gone.

Next: Chapter 7 — DIY, Software, or Pro?