The One Number That Decides
Itemizing only saves you money when your total itemized deductions exceed the standard deduction for your filing status. For roughly 90% of filers, the standard deduction wins — and that percentage may have increased after the One Big Beautiful Bill Act raised it to $15,750 single / $31,500 MFJ for 2025 ($16,100 / $32,200 in 2026).
The calculator above does the full tax comparison, but here’s the shortcut: if you don’t own a home and don’t live in a high-tax state, the standard deduction almost certainly wins. The two biggest itemized deductions — mortgage interest and SALT — require a home or significant state/local tax bills to even approach the standard deduction threshold.
Three Scenarios, Three Different Answers
Renter in a low-tax state — Standard wins easily
Single filer, $75,000 income, renting in Florida (no state income tax):
- Standard deduction: $15,750
- Itemized: $500 charitable = $500 total
- Winner: Standard deduction, by $15,250
- Tax savings vs. itemizing: $3,355
With no mortgage interest and no state income tax, there’s almost no path to beating the standard deduction. You’d need over $15,750 in charitable giving alone — unrealistic at this income.
Homeowner in a high-tax state — Itemizing wins
Single filer, $120,000 income, homeowner in New Jersey:
- Standard deduction: $15,750
- Itemized: $14,000 mortgage interest + $15,000 SALT + $3,000 charitable = $32,000 total
- Winner: Itemize, by $16,250
- Tax savings: $3,593
This is the classic itemizer profile: a homeowner paying significant mortgage interest in a state with high income and property taxes. The $40,000 SALT cap ($40,400 in 2026) is generous enough to cover the full $15,000 here.
High-income couple — Itemizing wins big
Married filing jointly, $250,000 combined income, homeowners in California:
- Standard deduction: $31,500
- Itemized: $22,000 mortgage interest + $35,000 SALT + $8,000 charitable = $65,000 total
- Winner: Itemize, by $33,500
- Tax savings: $7,606
At higher incomes with substantial property values, itemizing can save thousands. The $35,000 in SALT easily fits under the $40,000 cap. Before OBBBA, that same $35,000 would have been capped at $10,000 — slashing their itemized total to $40,000 and their savings to about $1,870.
What the OBBBA Changed — and Who It Helps
The SALT cap increase from $10,000 to $40,000 is the single biggest factor shifting the standard-vs-itemized math. Before 2025, many homeowners in states like California, New York, New Jersey, and Connecticut had their SALT deductions slashed so severely that itemizing no longer made sense. That’s reversed for most of them now.
The winners: dual-income couples in high-tax states with combined state income tax and property tax between $10,000 and $40,000. They recaptured $0–$30,000 in deductions overnight.
The catch: high earners face a phasedown. For MAGI above $500,000 ($250,000 MFS), the SALT cap drops by 30 cents per dollar of excess. At $600,000 single, the cap is back to $10,000 — the pre-OBBBA level. At any income above $600,000, the OBBBA’s SALT increase provides zero additional benefit.
| MAGI (Single) | SALT Cap | Effective Change vs. Old $10K |
|---|---|---|
| $400,000 | $40,000 | +$30,000 |
| $500,000 | $40,000 | +$30,000 |
| $550,000 | $25,000 | +$15,000 |
| $600,000+ | $10,000 | No change |
For 2026, the base cap rises to $40,400 and the threshold to $505,000, but the structure is the same.
The Medical Expense Trap
Medical expenses sound like they should be a major deduction, but the 7.5% AGI floor makes them nearly impossible to claim. At $100,000 AGI, only expenses above $7,500 count. At $75,000, the floor is $5,625.
A realistic example: you earn $100,000 and have $12,000 in unreimbursed medical expenses (a major surgery, for instance). Only $4,500 qualifies ($12,000 − $7,500 threshold). Combined with $5,000 SALT and $1,000 charitable, your total itemized is $10,500 — still $5,250 short of the $15,750 standard deduction.
Medical expenses only push you into itemizing territory in extreme situations: serious illness, long-term care costs, or a year with unusually low income (which lowers the 7.5% threshold). If you’re heading into a year with major planned medical expenses, consider timing strategies — bunching procedures into a single tax year can push you over the threshold.
One edge case worth knowing: filing Married Filing Separately can sometimes help with medical deductions. If one spouse has enormous medical bills and low income, MFS splits the AGI — lowering the 7.5% threshold for that spouse. Run both scenarios in the Marriage Tax Calculator to see if the trade-off is worth the lost credits.
Important MFS rule: if one spouse itemizes, the other must also itemize — they cannot take the standard deduction. This means the medical-expense MFS strategy only works if both spouses benefit from itemizing, or if the sick spouse’s itemizing savings outweigh the healthy spouse losing the standard deduction.
The 2026 Charitable Floor
Starting in 2026, the OBBBA adds a 0.5% AGI floor to itemized charitable deductions. Only contributions exceeding that floor are deductible. At $100,000 AGI, the first $500 of giving produces no tax benefit. At $200,000, the floor is $1,000. At $1,000,000, it’s $5,000.
This floor matters most near the standard-vs-itemized breakeven point. If your other itemized deductions total $15,500 and you give $1,000 to charity, you might expect $16,500 total — just above the $16,100 standard deduction for 2026. But at $100,000 AGI, only $500 of that $1,000 counts, dropping you to $16,000 — below the threshold. The calculator applies this floor automatically for 2026+.
One silver lining: non-itemizers get a new $1,000 standard charitable deduction starting 2026 ($2,000 MFJ). If you take the standard deduction, you still get a small benefit for giving.
The Charitable Bunching Strategy
If your itemized deductions are close to the standard deduction threshold, bunching charitable contributions into alternating years can save money. This strategy becomes even more important after 2026 because the charitable floor eats into small annual gifts:
Without bunching ($90K single, $10K mortgage, $8K SALT, $3K/yr charity):
- Every year: $10,000 + $8,000 + $3,000 = $21,000 itemized → Itemize (saves $5,250 × marginal rate)
With bunching (same taxpayer, $6K charity every other year):
- Bunched year: $10,000 + $8,000 + $6,000 = $24,000 → Itemize ($8,250 above standard)
- Off year: $10,000 + $8,000 + $0 = $18,000 → Itemize ($2,250 above standard)
In this case, bunching doesn’t help because you’d itemize either way. Bunching matters most when your non-charitable itemized deductions are just below the standard deduction line. If your mortgage + SALT total $14,000, adding $2,000 in charity gets you to $16,000 — barely above the $15,750 threshold. Doubling up one year ($18,000) and taking the standard deduction the next year ($15,750) nets you $33,750 in total deductions over two years, versus $32,000 from itemizing both years.
A donor-advised fund makes this easy — contribute a lump sum, get the tax deduction immediately, and distribute to charities over time.
Five Deductions People Forget to Count
Before defaulting to the standard deduction, check whether you have any of these:
- State and local sales tax — if you live in a no-income-tax state (FL, TX, WA, etc.), you can deduct sales tax instead of income tax under the SALT cap. This is especially valuable if you made large purchases (car, furniture, appliances). Use the IRS Sales Tax Calculator to estimate.
- Property tax on vehicles — in states that charge annual property tax on cars (CT, MA, NC, VA), this counts toward your SALT total.
- Points paid on a mortgage — origination points paid when you bought or refinanced are deductible as mortgage interest. One point on a $400,000 loan is $4,000.
- Casualty and theft losses in federally declared disaster areas — if your area was declared a federal disaster, unreimbursed losses above $100 per event (minus 10% of AGI) are deductible.
- Investment interest expense — margin interest paid on taxable investment accounts is deductible up to your net investment income.
Above-the-Line Deductions Stack With Both Methods
A common misconception: “I take the standard deduction, so I can’t deduct anything.” Above-the-line deductions reduce your AGI before you choose standard or itemized. You get them either way:
- HSA contributions — $4,300 individual / $8,550 family ($4,400 / $8,750 in 2026)
- Traditional IRA — up to $7,000 ($8,000 if 50+)
- Student loan interest — up to $2,500
- Self-employment tax — deduct the employer-equivalent half
- Tips and overtime — up to $25,000 in tips and $12,500 in OT premium pay (2025–2028)
These don’t affect the standard-vs-itemized decision directly, but they lower your AGI — which lowers the 7.5% medical expense threshold and affects eligibility for credits like the Child Tax Credit and education credits.
When the Answer Changes Year to Year
Your deduction method isn’t a permanent choice. Circumstances that can flip the answer:
- Buying or selling a home — mortgage interest appears or disappears
- Paying off a mortgage — interest shrinks as principal grows; late in a mortgage, interest may drop below the threshold
- Moving states — going from California to Texas eliminates state income tax from your SALT total
- Retirement — lower income means a lower standard deduction isn’t needed as much, but also means lower SALT and possibly no mortgage
- Tax law changes — the SALT cap reverts to $10,000 in 2030 unless Congress acts again
Run this calculator every year with your actual numbers. The five minutes it takes can be worth hundreds or thousands in tax savings.