SALT Cap Phaseout 2026: Keep Your $40,400 Deduction

Under the SALT cap phaseout for 2026, your state and local tax deduction is capped at $40,400. That cap drops by 30 cents for every dollar of modified adjusted gross income (MAGI) over $505,000, and it stops falling at a $10,000 floor, which you hit at about $606,333 of MAGI. If you're anywhere in that band, the moves you make before December 31, 2026 decide how much of the deduction you keep. This guide covers the math, the hidden tax rate it creates, and a dated checklist.

Last updated: October 24, 2026 · By Syed Kaja Moinudeen

Key takeaways

• The 2026 cap is $40,400 ($20,200 if married filing separately). It phases down above $505,000 of MAGI ($252,500 MFS) and never drops below $10,000 ($5,000 MFS).
• Inside the phaseout band, each extra $1 of income can cost about 41.6% to 45.5% in federal tax, before state tax.
• Pre-tax 401(k) and HSA money, loss harvesting, QCDs, and income timing all lower MAGI. Business owners can use a PTET election, which sits outside the cap altogether.
• Prepaid property tax counts for 2026 only if it is assessed and paid in 2026.
• The higher cap rises 1% a year through 2029. In 2030 it reverts to $10,000.

SALT Cap 2026 at a Glance: $40,400 Cap, $505,000 MAGI Threshold, $10,000 Floor

The One Big Beautiful Bill Act raised the old $10,000 limit to $40,000 for 2025. The IRS confirms that 2026 brings the increase to $40,400 ($20,200 for married filing separately), still with a $10,000 floor. For 2025 the phase-down began at $500,000 of MAGI. For 2026 it begins at $505,000 ($252,500 MFS).

Filing status	2026 cap	Phaseout starts (MAGI)	Floor	Floor reached at about
Single, head of household, married filing jointly	$40,400	$505,000	$10,000	$606,333
Married filing separately	$20,200	$252,500	$5,000	$303,167

The cap covers the total of three things: state and local income taxes or general sales taxes (not both), real estate taxes, and personal property taxes. That's the same mix of deductible taxes as before.

How the 30% Phaseout Works, with Worked Examples at $520K, $560K and $610K MAGI

The formula: take MAGI minus $505,000, multiply by 0.30, and subtract the result from $40,400. If the answer is below $10,000, your cap is $10,000.

For most people, MAGI is simply the AGI on Form 1040, line 11b. You only add income back if you excluded foreign earned income (Form 2555), American Samoa income (Form 4563), or Puerto Rico income. The Schedule A instructions have a worksheet for those cases.

Household (MAGI)	Excess over $505,000	Cut (30%)	Cap kept
California couple, $520,000	$15,000	$4,500	$35,900
New York single filer, $560,000	$55,000	$16,500	$23,900
New Jersey couple, $610,000	$105,000	$31,500	$10,000 (floor)

Suppose the California couple pays $18,000 in property tax and has $32,000 of state income tax withheld. That's $50,000 of SALT, but only $35,900 counts. If the New Jersey couple cuts MAGI by $40,000 to $570,000, their cap climbs back to $20,900, which is $10,900 more deduction.

The Hidden 45%+ Marginal Tax Rate Between $505,000 and ~$606,333

Inside the band, every extra dollar of income gets taxed and also shrinks your deduction by 30 cents. If you're in the 35% bracket, the combined federal hit is 35% × 1.3 = 45.5%. In the 32% bracket it's 41.6%. The 2026 35% bracket starts at $256,225 of taxable income for single filers and $512,450 for joint filers.

Here's the New York filer at $560,000 with a $10,000 bonus. The bonus itself costs $3,500 at 35%. It also cuts the cap by $3,000, and losing that deduction costs another $1,050. That's $4,550 of federal tax on $10,000. State tax comes on top, and on investment income so can the 3.8% net investment income tax (thresholds: $250,000 joint, $200,000 single).

Two caveats. This only matters if your SALT payments are larger than your reduced cap. And once your MAGI is above about $606,333, the floor is locked in, so extra income no longer touches your SALT deduction.

Does the Higher Cap Even Help You? Itemizing vs. the 2026 Standard Deduction

The 2026 standard deduction is $32,200 for married couples filing jointly, $16,100 for single filers, and $24,150 for heads of household.

Take a couple at $610,000 with a $10,000 SALT cap, $12,000 of mortgage interest and $6,000 of gifts to charity. Their itemized total is $28,000, so they'd take the $32,200 standard deduction, and the SALT phaseout costs them nothing extra. Now put the same couple at $540,000. Their cap becomes $29,900, itemized deductions total $47,900, and they come out $15,700 ahead of the standard deduction. Run both numbers before you spend effort lowering MAGI.

7 Moves to Lower MAGI Before December 31, 2026

1. Max out pre-tax 401(k) or 403(b) contributions

The 2026 employee limit is $24,500. The catch-up is $8,000 if you're 50 or older, or $11,250 if you're 60 to 63. Raise your deferral rate now, while there are still paychecks left this year. One catch: if your prior-year FICA wages from that employer were above $150,000, your catch-up generally has to go in as Roth, which doesn't lower MAGI. See our Roth catch-up rule guide for details.

2. Fund your HSA

If you have a high-deductible health plan, you can contribute up to $4,400 for self-only coverage or $8,750 for family coverage, plus $1,000 if you're 55 or older. You can generally make 2026 contributions up to the April 2027 filing deadline.

3. Use nonqualified deferred compensation

Deferral elections usually have to be made ahead of time, so this may be a 2027 move. Check your plan's election window now.

4. Push bonuses and stock sales into January

Ask HR whether a year-end bonus could be paid in January instead. RSUs are taxed when they vest, but you choose when to sell shares you already own. A sale on January 4 lands on your 2027 return.

5. Harvest losses

Capital losses offset capital gains first. Any leftover loss offsets up to $3,000 of ordinary income ($1,500 MFS), and the rest carries forward. Watch the wash-sale rule if you buy the same holding back.

6. Time Roth conversions

Converted amounts count in MAGI. If a conversion would push you into the band, think about delaying it. If you'll be above about $606,333 anyway, the conversion won't cost you any extra SALT deduction.

7. Give from your IRA if you're 70½ or older

A qualified charitable distribution of up to $111,000 per person in 2026 goes straight from your IRA to the charity and stays out of your income. Ask your custodian about processing cutoffs early.

Business Owners: Using the PTET Workaround to Get Around the Cap Entirely

If you own a partnership or S corporation, most high-tax states let the business elect to pay state income tax at the entity level. Under IRS Notice 2020-75, the entity deducts that tax, and it isn't counted against any owner's SALT cap. Your K-1 income also shrinks, so your MAGI goes down too. The final OBBBA left this workaround alone.

Deadlines vary by state:

• California: the PTE elective tax runs through tax years beginning before 2031. A June 15, 2026 payment was required. If the business missed or underpaid it, it can still elect, but the credit drops by 12.5% of the unpaid amount.
• New York: the 2026 PTET election had to be made by March 16, 2026. Businesses that elected have estimated payments due on December 15.

If you want the deduction on your 2026 return, make sure the entity pays by December 31, 2026, and confirm your own state's rules with your CPA.

Timing Your SALT Payments: Prepaying Property Taxes and Q4 State Estimates

Prepaid property tax is deductible for a year only if it is assessed and paid in that year. The IRS first said this in advisory IR-2017-210. So if your county has already issued a bill with an installment due in early 2027, paying it in December may count for 2026. Paying an estimate of a future bill that hasn't been assessed won't count. Your county tax office can tell you which situation you're in.

The state's fourth-quarter estimated payment is normally due January 15, 2027. If you pay it by December 31, it counts for 2026. Do this only if your 2026 SALT total is still below your cap. Anything over the cap is wasted, and you lose the chance to deduct it in 2027.

Bunching Strategy: Alternating Big and Small Years Before the 2030 Reversion

The cap applies every year, so you can't bunch SALT above it. What you can do is bunch other deductions, and plan your income around the band. Take a couple at $600,000 with an $11,900 cap and $10,000 of gifts to charity each year. Their itemized total of $21,900 loses to the $32,200 standard deduction. If they put three years of giving ($30,000) into a donor-advised fund in 2026, they can itemize $41,900 this year and take the standard deduction in 2027 and 2028.

Income works the same way. Keep 2026 under $505,000, and take gains or conversions in one big year where you'll be over $606,333 anyway. The higher cap lasts through 2029. In 2030 it goes back to $10,000 with no phaseout.

Married Filing Separately Trap and Other Common Mistakes

• Assuming MFS gets around the phaseout. Filing separately cuts the cap, the threshold and the floor in half. If one spouse itemizes, the other can't take the standard deduction. It can help a couple whose incomes are very lopsided, but run both returns before deciding.
• Forgetting that capital gains count. A large December sale can wipe out a deduction you planned around.
• Ignoring AMT. SALT isn't deductible for the alternative minimum tax, so a bigger SALT deduction can trigger AMT. Have your preparer run Form 6251.
• Overpaying state estimates. Payments above the cap give you nothing for 2026.
• Worrying about the 2/37 rule too soon. The new limit on itemized deductions only applies above the 37% bracket, which starts at $768,700 of taxable income for joint filers and $640,600 for single filers. That's above the SALT phaseout band.

Year-End SALT Checklist

By	Action
Oct 31	Project 2026 MAGI and add up the SALT you've paid so far
Nov 7	Raise 401(k) and HSA payroll contributions
Nov 30	Harvest losses, decide on any Roth conversion, ask HR about bonus timing
Dec 1	Submit QCD requests
Dec 15	Make the NY PTET estimate; confirm other PTET payments
Dec 31	Pay assessed property tax and the Q4 state estimate if you're under the cap; fund a donor-advised fund
Apr 15, 2027	Last day for 2026 HSA contributions

Frequently Asked Questions

Is the $40,400 SALT cap per person or per return?

Per return. Single, head of household and joint returns each get $40,400. Each spouse filing separately gets $20,200.

Does sales tax count toward the SALT cap?

Yes. You can deduct state and local income taxes or general sales taxes, but not both. Whichever you pick, it shares the cap with real estate and personal property taxes.

What income counts toward the $505,000 threshold?

MAGI, which for most people is AGI. That includes wages, bonuses, RSU income, capital gains, IRA withdrawals and Roth conversions. Excluded foreign or Puerto Rico income gets added back.

How does the threshold change in 2027?

Both the cap and the $505,000 threshold rise 1% a year through 2029. In 2030 the cap reverts to $10,000 and the phaseout goes away.

Can I deduct 2027 property taxes if I pay them in December 2026?

Only if the tax has been assessed and paid in 2026. Paying an estimate of a bill that hasn't been assessed yet won't count for 2026.

Does a PTET payment count against my personal SALT cap?

No. Under IRS Notice 2020-75, entity-level state income tax is deducted by the business and isn't counted against the owners' SALT limit.

Should married couples file separately to avoid the phaseout?

Usually not. Filing separately halves the cap, the threshold and the floor, and both spouses have to itemize. It occasionally helps when incomes are very unequal, so compare both versions first.

Sources

• IRS Publication 6079: Rev. Proc. 2025-32 and One, Big, Beautiful Bill Act
• IRS Publication 530
• IRS Instructions for Schedule A (2025)
• IRS Topic 503, Deductible Taxes
• IRS Notice 2020-75
• IRS Notice 2025-67
• IRS Rev. Proc. 2025-19 (HSA limits)
• IRS Topic 409 and Topic 551
• California FTB PTE elective tax notice
• New York State PTET

This article is educational information, not financial, tax or legal advice. Talk to a qualified tax professional about your situation.