SALT Cap up to $40,000 with MAGI Phaseout: Compliance Planning for Itemizers

Author: Gloria Liu, CPA ｜ YCL Tax, Accounting & Advisory

Bottom line in one breath

If you itemize in Cary / RTP / Wake County and pay material state/local income and property taxes: OBBBA (P.L. 119-21) §70120 raises the federal individual SALT cap from the long-standing $10,000 to $40,000 for 2025 ($40,400 for 2026), then phases the benefit down by 30% of MAGI over a high threshold, floored at $10,000, with a statutory return to $10,000 in 2030 absent new law. You must still itemize on Schedule A—this is not an automatic $40,000 write-off. For North Carolina, NCDOR states that mortgage interest + real estate property taxes remain combined-capped at $20,000; a higher federal SALT cap does not turn into a $40,000 NC deduction. Plan federal vs. NC itemizing carefully—compliance planning.

Background

TCJA (2017) capped individual SALT deductions at $10,000 ($5,000 MFS), hitting many homeowners and high-tax-state filers. OBBBA §70120 amended IRC §164(b)(6)–(7) effective for years beginning after December 31, 2024, creating an “applicable limitation amount” and a MAGI-based phasedown. The Code sets $40,000 for 2025, $40,400 for 2026, then 101% of the prior year through 2029, and $10,000 for years after 2029. North Carolina’s Session Law 2026-31 updated IRC conformity to July 5, 2025; NCDOR FAQ Q16 addresses how the federal SALT increase interacts with NC itemized deductions.

Old vs. new

1. Federal cap: Old—generally $10,000 ($5,000 MFS). New—2025: $40,000 ($20,000 MFS); 2026: $40,400 ($20,200 MFS); 2027–2029 roughly +1%/year; 2030+: $10,000.

2. MAGI phasedown: Above the threshold (2025: $500,000; 2026: $505,000; then ~1%/year; half for MFS), reduce the applicable limitation by 30% of the excess, but not below $10,000 ($5,000 MFS).

3. Still must itemize: SALT remains a Schedule A itemized deduction—unlike OBBBA tip/OT/car-loan/senior special deductions that can apply without itemizing.

4. What counts: State/local income taxes (or the general sales-tax election) and real property taxes, subject to §164 and the cap; deduct the lesser of the allowable cap and qualified SALT paid.

5. North Carolina (critical): NC itemizing ≠ federal Schedule A. NC allows qualified home mortgage interest + real estate property taxes, combined limit $20,000 (G.S. §105-153.5(a)(2)). The General Assembly did not raise that $20,000 NC limit. After conformity, NC real-estate property tax can follow the post-OBBBA §164 amount, but together with mortgage interest still cannot exceed $20,000 (NCDOR Q16). Returns filed under the old $10,000 federal mindset may need review.

6. Sunset: The raised cap is a 2025–2029 window; do not assume it survives 2030.

Self-check: does this affect you?

1. You tend to itemize federally, and combined state income + property taxes exceed the old $10,000 cap.

2. Your MAGI nears or exceeds $500,000 / $505,000 (2026)—you need the phasedown math.

3. You file North Carolina and must compare federal itemizing vs NC standard vs NC itemizing (mortgage + property tax ≤ $20k).

4. You already filed 2025 NC limiting property tax to $10k under the old federal cap—review per NCDOR Q16.

5. You own a pass-through and may also evaluate PTET (separate topic—do not conflate with the individual SALT cap).

Simplified example (illustration only)

Assume a Wake County MFJ couple for 2025 paid $35,000 of qualified federal SALT, MAGI $480,000 (under $500,000), and itemizes federally:

1. Federal: Cap $40,000 vs tax paid $35,000 → about $35,000 deductible (illustration), above the old $10,000 cap.

2. If MAGI is $550,000: $50,000 over threshold × 30% = $15,000 reduction → applicable cap about $25,000; vs $35,000 paid → about $25,000 federal SALT (illustration).

3. If MAGI is ~$600,000+: applicable cap floors at $10,000 (order-of-magnitude illustration).

4. North Carolina: If mortgage interest $12,000 + real estate tax $9,000 = $21,000, NC still allows only $20,000 combined (illustration)—the federal $40,000 cap does not create a $40,000 NC write-off.

Results vary; there is no one-size-fits-all answer.

Action timeline

1. Now: Gather W-2 state withholding, NC estimates, and county property-tax bills; project MAGI vs. the phaseout band.

2. Each year: Compare federal standard vs itemized; separately compare NC standard vs mortgage+property-tax (≤$20k)—answers can diverge.

3. 2025–2026 filing: Use the correct year cap/threshold ($40,000/$500,000 for 2025; $40,400/$505,000 for 2026).

4. If already filed early: Recheck NC real-estate tax per NCDOR Q16 (still subject to the $20k combined NC limit).

5. Multi-year: Treat 2029→2030 as a planning cliff for large SALT years—compliance timing, not promised outcomes.

What YCL can do

1. Model the federal applicable SALT limitation (including 30% MAGI phasedown) vs. tax paid.

2. Parallel North Carolina standard vs. $20k mortgage+property-tax itemizing so clients do not mirror federal figures onto D-400.

3. Review/amend NC returns affected by S.L. 2026-31 and NCDOR Q16.

4. Separately frame individual SALT vs. PTET for entity owners (deeper dive in another pack).

5. Bilingual support from Cary (RTP) and Shanghai with CPA Chenchen Liu and Gloria—compliance planning.

FAQ

Q: Does everyone get a $40,000 SALT deduction starting in 2025?

A: No. You must itemize; the figure is a cap, not an automatic deduction; high MAGI triggers a 30% phasedown down to a $10,000 floor.

Q: If the federal SALT cap is $40,000, can I deduct $40,000 in North Carolina?

A: No. NCDOR Q16: NC mortgage interest and real estate property taxes remain combined-capped at $20,000. The General Assembly did not raise that limit.

Q: Are 2026 numbers the same as 2025?

A: Not exactly. 2026 uses a $40,400 cap and $505,000 threshold (non-MFS), then roughly 1% annual increases through 2029, with a planned return to $10,000 in 2030.

Book a consult

YCL Tax, Accounting & Advisory

Web: yclcpa.com ｜ Email: info@yclcpa.com

Phone: 919-802-8376 / 980-202-0666 ｜ WeChat: YCLUSA

U.S. office: 1140 Kildaire Farm Rd. STE 208, Cary, NC 27511

Shanghai office: 2-516, Zhongye Xiangteng Plaza, Lane 31, Jiatong Road, Shanghai

Disclaimer

This article is general tax information only and is not tax, legal, or investment advice for any person or business. Application depends on itemizing status, MAGI, taxes paid, and current federal and state law. Follow the latest IRS and NCDOR releases. Items marked 待核 require pre-filing verification. Consult a licensed professional for advice specific to you.