Year-End Tax Planning Checklist for Ultra-High-Net-Worth Families (2026)

Each donor can transfer $19,000 per recipient gift-tax-free in 2026.¹ A couple gift-splitting transfers $38,000 per recipient — no Form 709 required if no taxable gifts otherwise. With 10 grandchildren and 2 adult children: $456,000 permanently out of your estate annually. Set up transfers by late November to allow time for checks to clear or wires to settle. Review GST planning to ensure annual gifts to skip persons have GST annual exclusion allocated correctly.

The 5-year forward election under §529(c)(2)(B) allows a lump-sum contribution of $95,000/donor ($190,000/couple) per beneficiary — spread over 5 years against the annual exclusion.² If you superfunded in a prior year, partial annual exclusion capacity may remain. Use our 529 superfunding calculator to model remaining capacity. Backstop: SECURE 2.0 §126 allows unused 529 balances to roll to a Roth IRA (up to $35,000 lifetime, $7,000/year) for the account beneficiary after 15 years.

GRATs require annuity payments by the date specified in the trust instrument (often December 31 or a trust anniversary date). A missed payment can cause trust failure, returning all assets to your estate. Rolling GRAT programs require new tranche setup and funding before year-end to capture appreciation above the §7520 hurdle rate. See GRAT calculator and UHNW estate planning guide.

An installment sale note to an IDGT requires interest at the applicable federal rate (June 2026 long-term AFR: approximately 3.68%) per the note schedule. Missed or deficient interest payments risk recharacterizing the arrangement as a gift — eliminating the estate-freeze benefit. Verify payment dates with the trustee and confirm the note terms reflect current AFR if refinancing. See IDGT installment sale guide.

Family limited partnerships amplify annual exclusion efficiency through valuation discounts: LP units valued 15–35% below underlying assets mean each $19,000 annual exclusion gift moves $25,000–$29,000 in underlying value. Unit transfers must be documented with a current appraisal and completed before December 31. See FLP planning guide.

ILIT premium payments by the grantor are gifts to the trust that qualify for the annual exclusion only if beneficiaries receive Crummey withdrawal notices. The sequence matters: notices go out → beneficiaries have a meaningful window to withdraw → window lapses → premiums are paid. Collapsing this sequence risks recharacterizing premiums as non-excludable taxable gifts. Confirm timeline with your trustee and insurer. See ILIT planning guide.

After a QPRT term ends, the grantor must pay fair market rent to continue residing in the home — unpaid rent is a gift that can jeopardize the completed-transfer analysis. Review the rent schedule and confirm payments are current and documented. See QPRT planning guide.

The 2026 GST exemption is $15M (same as the estate tax exemption, per OBBBA).¹ Unlike portability, the GST exemption is not transferable between spouses — each person's unused exemption is lost at death. Any transfers to dynasty trusts, trusts for grandchildren, or skip persons made in 2026 require explicit exemption allocation on Form 709 (or opt-out election where appropriate). Automatic allocation rules apply to certain direct skips — confirm with counsel. See GST planning guide.

Losses harvested before December 31 offset gains dollar-for-dollar, then $3,000/year of ordinary income (remainder carries forward indefinitely). The 30-day wash-sale rule runs both directions: no purchase of a "substantially identical" security from 30 days before through 30 days after the sale. At-scale playbook: swap ETFs (e.g., S&P 500 ETF → total market ETF), or swap individual stock for a sector ETF during the window. Coordinate across all taxable accounts — an IRA buy within 30 days of a taxable sale disallows the loss permanently. See direct indexing guide.

If 2026 income is elevated (liquidity event, large Roth conversion, QOZ deferral recognition), consider deferring discretionary gains to 2027. If 2026 is a lower-income year, recognize gains now to use the 20% LTCG bracket before 2027 income rises. Your CPA should run a full income projection before year-end. See UHNW tax planning guide.

The 3.8% NIIT applies to the lesser of net investment income or excess MAGI above $250,000 (single) / $500,000 (MFJ). At $30M+, nearly all passive investment income bears NIIT. Review whether any active businesses where you provide significant services qualify as non-passive under material participation tests — material participants avoid NIIT on that activity's income. See UHNW tax planning guide.

For QSBS issued after July 4, 2025 (OBBBA rules): 3-year hold = 50% exclusion (up to $15M), 4-year = 75%, 5-year = 100%. The holding period milestone date may fall close to year-end — confirm with counsel whether a sale before vs. after December 31 changes your exclusion percentage. Pre-OBBBA stock uses the prior $10M / 10× basis cap. See QSBS planning guide.

Employer stock in a 401(k) with a low cost basis can qualify for long-term capital gains treatment on the appreciation (NUA strategy) rather than ordinary income on the full distribution. Triggering event required: separation from service, age 59½, disability, or death — must occur in the same calendar year as the lump-sum distribution. If you're nearing eligibility, model the breakeven with our NUA calculator before December 31.

Interest on a pledged asset line (PAL) is investment interest expense, deductible against net investment income under §163(d). You may elect to treat LTCG as ordinary income to increase the deductible amount — at the cost of losing capital gains treatment on that portion. Whether this election is net-positive depends on your LTCG rate vs. marginal rate differential and the amount of investment interest expense. Make the election on Form 4952 with your 2026 return. See securities-based lending guide.

The deduction is taken in the contribution year regardless of when grants are made. Appreciated securities held >1 year go in at FMV — zero capital gains recognized. DAF sponsors (Fidelity Charitable, Schwab Charitable, NPT) typically require in-kind securities transfers completed by December 20–28 — confirm with your sponsor's deadline. A single contribution year can compress multiple years of giving into one high-deduction event. See our philanthropic vehicle calculator and charitable bunching guide.

IRA owners age 70½+ can transfer up to $111,000/person directly to a qualifying charity in 2026 — excluded entirely from AGI.⁴ Benefits vs. a regular contribution: (1) no OBBBA 35% cap applies — QCDs avoid the deduction cap entirely, (2) no 0.5% AGI floor, (3) QCDs count toward your RMD. A married couple can transfer $222,000 with zero AGI impact. Must be wired directly from the IRA custodian by December 31. See retirement income planning guide.

Private foundations must distribute at least 5% of net investment assets annually or face excise taxes. The distribution year typically matches the foundation's fiscal year. Confirm with your foundation administrator that grant amounts plus expenses meet the 5% floor, and that all grants are properly documented and approved before December 31. See philanthropic vehicles guide.

A charitable remainder trust allows you to contribute a highly appreciated, concentrated position before December 31, take a partial upfront deduction (based on the §7520 rate — 5.0% in mid-2026), defer capital gains over the trust term, and receive an income stream. CRT setup and funding must be completed this tax year to capture the 2026 deduction. Use our CRT calculator to model CRAT vs. CRUT mechanics at current rates.

Required for: traditional IRAs, SEP/SIMPLE IRAs, 401(k)s/403(b)s (unless still employed at that company and not a 5%+ owner), and — critically — inherited IRAs subject to T.D. 10001. Under T.D. 10001, inherited IRA beneficiaries where the decedent died past their required beginning date must take annual distributions in years 1–9 before the full 10-year rule applies (mandatory starting with the 2025 tax year). Roth 401(k) and Roth TSP accounts no longer have lifetime RMDs under SECURE 2.0. See beneficiary designation guide and retirement income planning guide.

Roth conversions are irrevocable — there is no recharacterization option. Determine your optimal amount with a bracket-fill analysis: fill the current bracket without crossing into the next. At UHNW scale, estate planning math often justifies conversions even into higher brackets: each converted dollar avoids 40% estate tax at death (above the $15M exemption) and all future trust income is estate-tax-free forever. Factor in IRMAA: a large 2026 conversion raises your 2028 Medicare premiums (2-year lookback). Model both tax and IRMAA impact. See Roth conversion calculator and Roth conversion strategy guide.

2026 employee deferral limit: $24,500.⁵ Age 50+ catch-up: $8,000 ($32,500 total). Ages 60–63 SECURE 2.0 super catch-up: $11,250 ($35,750 total). For business owners, verify total additions don't exceed the §415 annual limit — confirm with your plan administrator. Ensure your final December payroll reflects the right deferral rate to hit the annual ceiling.

If your 401(k) allows after-tax contributions plus in-service withdrawals (or in-plan Roth conversions), you can contribute additional after-tax dollars up to the §415 limit minus employer contributions and deferrals, then immediately roll them to a Roth account. This must be executed in the calendar year. The mega backdoor Roth is one of the highest-ROI year-end moves for executives at UHNW scale. See Roth conversion strategy.

Cash balance and defined benefit plans allow annual tax-deductible contributions far exceeding 401(k) limits — often $100,000–$300,000/year depending on age and plan design. Actuarial calculations must be completed before year-end to determine the required and maximum contribution amounts. Contributions can be funded by the business return due date (including extensions), but coordinate with your actuary now. See business succession planning guide.

Income distributed to beneficiaries carries out distributable net income (DNI) and is deducted from the trust's taxable income — taxed at the beneficiary's rate instead. For trusts with beneficiaries in lower brackets (young adult children, charitable organizations), distributing before December 31 can save significant federal and state income tax. Capital gains are generally retained in the trust even if distributed to principal — confirm with your trust administrator. See our interactive trust income tax planning guide.

South Dakota, Nevada, and Florida impose no state income tax on undistributed trust income. If any trust migration to a no-tax jurisdiction is pending, it should be completed before December 31 to affect this year's state taxes. State nexus for trusts turns on trustee location, investment management, and administration — confirm all factors are correct with trust counsel. See trust income tax planning and asset protection guide.

A SLAT can make discretionary distributions to the grantor's spouse during the year. If distributions are needed to fund living expenses or cash flow, coordinate with the trustee before December 31. Review the distribution standard (HMSE vs. purely discretionary) against projected family cash needs. See SLAT trust guide.

A dynasty trust in South Dakota or Nevada can hold assets in perpetuity. Annual review should confirm: the directed trust investment committee remains properly constituted, the investment policy statement reflects current asset allocation goals, and trustee succession plans are current. Family governance matters — a poorly administered perpetual trust can face decanting or modification proceedings that destroy the original plan. See family governance guide and GST planning guide.

OBBBA extended the Qualified Opportunity Zone program with a rolling 5-year structure. New QOF investments made by December 31, 2026 are within the current transition window offering a 10% basis step-up. If you have 2026 capital gains from a business sale, real estate transaction, or concentrated position liquidation, a QOZ investment defers recognition to the earlier of fund sale or 2031, then potentially excludes appreciation on a 10-year hold. Evaluate fund diligence now — don't wait until December. See QOZ planning guide.

Passive Foreign Investment Companies (PFICs) held without a QEF or mark-to-market (MTM) election generate punitive phantom income under the excess distribution rules. For MTM elections, the mark occurs on December 31. New PFIC acquisitions in 2026 require a protective QEF election with the 2026 return. Review Form 8621 obligations with your international tax advisor by year-end. See international tax planning guide.

Replacement property in a 1031 exchange must close within 180 days of relinquished property sale (or the tax return due date, whichever is earlier). An exchange straddling year-end may have a deadline that falls in early 2027 — but if the original sale was in July 2026, the 180-day window may already be tightening. Confirm the identification and closing date against your qualified intermediary's records. See 1031 exchange guide.

UBTI (unrelated business taxable income) from debt-financed income in private equity or hedge funds held inside an IRA or charitable trust can generate UBIT at the 37% trust/corporation rate. Request year-end UBTI estimates from fund managers before K-1s are issued — this lets you model the liability and determine whether a different fund structure (blocker corp, SPV) would be more efficient next year. See alternative investments guide.

OBBBA permanently restored 100% bonus depreciation for qualified property placed in service after January 19, 2025. Equipment or qualified improvement property placed in service by December 31, 2026 qualifies for full first-year expensing — creating immediate large current-year deductions for business owners. "Placed in service" means operational, not merely ordered or paid. See business succession planning guide.

§199A QBI deduction is permanently extended under OBBBA.⁷ For specified service trades or businesses (SSTBs — financial services, consulting, law, medicine), the 2026 deduction phases out between $406,000 and $556,000 of taxable income (MFJ). Above $556,000: no QBI deduction for SSTBs. Year-end retirement plan contributions that reduce taxable income below the phaseout can preserve the deduction. For non-SSTB businesses, the wage/capital limitation applies above the phaseout range instead of complete elimination.

Installment sale notes with deferred tax liability exceeding $5 million trigger an annual §453A interest charge (approximately 6% of the deferred tax). This is a recurring cost that must be accrued and paid — factor it into the total cost of the installment structure vs. upfront sale alternatives. See installment sale guide.

The FBAR (FinCEN 114) requires disclosure of foreign financial accounts with an aggregate maximum value exceeding $10,000 at any point during the calendar year. The April 15 due date carries an automatic extension to October 15 — for 2026 accounts, the FBAR is due April 15, 2027 (October 15, 2027 extension). Under Bittner v. United States (2023), non-willful civil penalties are per report, not per account. See international tax planning guide.

If you've executed a domicile change away from California, the FTB's 546-day rule (46 days in CA or fewer, averaged over two consecutive years) is a narrow safe harbor — most domicile changes turn on the "closest connections" test, not just day count. If 2026 is the second year of your two-year measurement period, confirm day count now and adjust any planned California visits. See domicile change guide.

The 2026 Foreign Earned Income Exclusion is $132,900.⁸ For UHNW families with international residency or business operations, confirm qualification requirements (bona fide residence or physical presence test) are met before year-end. The FEIE requires an active election — automatic application does not occur. Coordinate with your international tax advisor.

IRMAA surcharges are cliff-based — $1 over a threshold triggers the full next tier. If 2026 MAGI is already above $750,000 (top IRMAA tier for MFJ), additional gains or conversions don't worsen IRMAA further — the incremental IRMAA cost of a large Roth conversion is zero at the margin. Below $750,000, model each tier boundary carefully. For most UHNW couples, passive investment income alone exceeds $750,000 — confirm with your CPA before assuming a lower IRMAA tier. See retirement income planning guide.

If 2026 IRMAA premiums are elevated because 2024 MAGI included a one-time event (business sale, large RMD, forced distribution), file a life-change appeal with Social Security (Form SSA-44) if 2025 income was substantially lower. SSA will use more recent income data. Best filed well before November of the premium year — earlier is better.

Beneficiary designations supersede your will and cannot be overridden by a will or trust after the fact — they are binding contracts with the financial institution. Common triggers for an annual review: marriage, divorce, birth or adoption, death of a named beneficiary, change in trust terms, or change in financial strategy. Confirm that trusts named as beneficiaries meet the four see-through requirements if stretch treatment matters. See beneficiary designation guide.

Plans drafted assuming the pre-OBBBA sunset (reverting to ~$7M in 2026) may include formula clauses that now overfund bypass trusts relative to the surviving spouse's needs. Review "credit shelter" and "applicable exclusion" formulas with estate counsel — some plans cap bypass trust funding at a dollar amount; others use a formula that produces different results at $15M. Also review portability elections from any recent estate returns. See UHNW estate planning guide.

Family council meetings, investment policy statement reviews, and family charter updates require annual attention to remain current as family composition evolves. Year-end is a natural convening time. Agenda items: trustee succession plans, directed trust investment committee membership, next-gen financial education, annual philanthropy priorities, and — if applicable — prenuptial or postnuptial planning for upcoming family events. See family governance guide.