What is the most important Q4 tax move for BigLaw equity partners?

The NQDC deferral election, due around December 15 at most firms. At the 37% federal bracket, deferring $200,000 into a non-qualified deferred compensation plan saves approximately $74,000 in federal taxes today — money that compounds tax-deferred until distribution. Missing the deadline closes the window for an entire year.

Can BigLaw associates do a backdoor Roth IRA?

Yes. Associates earning above $168,000 (single) or $252,000 (MFJ) cannot contribute directly to a Roth IRA in 2026. The backdoor Roth — a $7,500 nondeductible traditional IRA contribution followed by a Roth conversion — works at any income level. The key trap: if you have pre-tax IRA money elsewhere, the pro-rata rule makes the conversion partially taxable. Fix it by rolling any pre-tax IRA into your firm's 401(k) before December 31.

What is tax-loss harvesting and why does it matter for BigLaw attorneys?

Tax-loss harvesting is selling investment positions at a loss to offset realized capital gains and up to $3,000 of ordinary income per year. BigLaw attorneys in the 37% bracket with NIIT exposure (3.8% on net investment income above $200,000 single / $250,000 MFJ) face combined federal rates exceeding 40% on long-term gains. Losses harvested in Q4 can offset bonus income, K-1 distributions, or future capital gains. The wash-sale rule bars buying substantially identical securities within 30 days of the sale.

Is it too late to max my 401(k) in Q4?

Usually not — but check your firm's deadline for changing elections. Many plans allow mid-year changes. The 2026 deferral limit is $24,500 ($8,000 total including catch-up for age 50+; $11,250 total super catch-up for ages 60–63). If you have been contributing less, increasing your withholding through Q4 payrolls can close the gap before the December 31 limit.

What is the NQDC election deadline for BigLaw partners?

Most BigLaw NQDC plans require deferral elections for the next compensation year by mid-December — typically December 15, though the exact date varies by firm. First-year equity partners have a 30-day initial deferral election window under §409A starting from the date they become eligible for the plan. Missing the general deadline means the income is fully taxable and you must wait until the next election cycle.

How does IRMAA affect BigLaw partners' year-end planning?

Medicare Part B IRMAA premiums in 2028 are determined by your 2026 modified adjusted gross income. The 2026 first-tier IRMAA threshold is $109,000 for single filers and $218,000 for MFJ. Senior equity partners earning above these amounts already face IRMAA surcharges; the question is whether NQDC deferrals, Roth conversions, or charitable deductions can reduce 2026 MAGI enough to drop below the next tier threshold and reduce future premiums.

BigLaw Attorney Year-End Tax Planning: 2026 Q4 Action Guide

September through December is when the most consequential tax decisions of your year get made — or missed. The NQDC election window closes around December 15. The 401(k) deferral limit resets January 1 with no carryover. Tax-loss harvesting requires 30 days after each sale before buying back in, so October and November trades need to be planned now. Your year-end bonus — and how it is withheld — can change your April tax bill by tens of thousands of dollars.

For equity partners, the combined federal-plus-state marginal rate often exceeds 50% in New York or California. At that rate, every dollar of taxable income you legally eliminate or defer saves fifty cents. For associates, the leverage is smaller but still real: a Q4 401(k) catch-up, a backdoor Roth, and washing out losing positions before December 31 can save $15,000–$25,000 in unnecessary taxes in a single year.

Key 2026 limits used throughout this guide¹

401(k): $24,500 deferral | age 50+ catch-up: $8,000 total | ages 60–63 super catch-up: $11,250 total
IRA / Roth IRA: $7,500 base | Roth phaseout single: $153K–$168K | MFJ: $242K–$252K²
HSA individual: $4,400 | family: $8,750 | Healthcare FSA: $3,400 | DC-FSA: $7,500 (OBBBA)
Standard deduction: $16,100 single | $32,200 MFJ³
37% bracket: $640,600+ single | $768,600+ MFJ
QCD limit: $111,000 | IRMAA first tier: $109,000 single / $218,000 MFJ

Interactive Q4 checklist — filtered by career stage

Select your role to show the moves that apply to you. Check off items as you complete them.

My role:

Move	Applies to	Priority	Tax impact at 37% bracket
Max 401(k) to $24,500 — increase your deferral election before Q4 payroll cut-off. Age 50+: total $8,000; ages 60–63: total $11,250.	All	High	~$9,065–$12,250 saved (37–50% combined rate)
NQDC election — deadline ~Dec 15 — decide how much of next year's compensation to defer into the plan. First-time eligible partners: 30-day §409A initial election window.	Equity partners	High	~$74,000 federal savings per $200K deferred at 37%
Backdoor Roth IRA — $7,500 — nondeductible traditional IRA contribution + conversion. If you have pre-tax IRA money, roll it into your 401(k) before Dec 31 to avoid the pro-rata rule.	All (above Roth limits)	High	Lifetime tax-free growth; ~$2,775 if converted at 37%
Tax-loss harvest taxable portfolio — review positions for unrealized losses. Sell and replace with uncorrelated exposure; wait 31 days before buying back the same or substantially identical security (wash-sale rule).	All with taxable accounts	High	23.8–27.8% federal eliminated on harvested losses
Max HSA if on HDHP — $4,400 individual / $8,750 family. You can make a lump-sum contribution; does not require payroll deduction. Triple tax advantage at 37%+ is the highest after-tax return in the tax code.	All on HDHPs	High	~$1,628–$3,234 saved (individual / family at 37%)
Q4 estimated payment — due Jan 15, 2027 — K-1 income has no withholding. Verify you have met the 90% current-year or 110%-of-prior-year safe harbor. A K-1 shortfall in Q4 is the most common cause of underpayment penalties for new equity partners.	Equity / non-equity partners	High	Avoids 8%+ IRC §6654 underpayment penalty
Open enrollment — HDHP vs PPO decision — annual window typically October/November. Switching to HDHP unlocks HSA eligibility for the full 2027 limit if enrolled by December 1.	All	Med	Unlocks $4,400–$8,750 HSA for 2027
Roth conversion window if income drops next year — attorneys leaving BigLaw, transitioning to government, or entering a clerkship gap face lower 2027 income. Convert traditional IRA / 401(k) money now at 37% or in the gap year at 22–24%.	Transitioning attorneys	Med	Converts at 24–32% vs. future 37%+ bracket
DAF contribution or direct stock donation — donate appreciated securities held more than one year: avoid the capital gain and get a deduction. OBBBA 2026: charitable deduction capped at 35% of AGI for 37%-bracket filers, with a 0.5% AGI floor.	All with appreciated positions	Med	Eliminates LTCG + deduction worth 35% of donation
Confirm cash balance plan contribution — law firm equity partners at firms with a CB plan must fund their annual actuarial contribution before year-end. Age-based limit can exceed $290,000 at older ages; stacks on top of 401(k).	Equity partners with CB plan	Med	Up to $290,000 additional sheltered at 37%+
IRMAA management for 2028 Medicare premiums — 2026 MAGI determines 2028 Medicare Part B and D premiums. The first-tier threshold is $109,000 single / $218,000 MFJ. NQDC deferrals or charitable deductions that reduce MAGI below a tier boundary cut multi-year premium costs.	Senior partners (50+)	Med	Saves $816–$5,532/yr per IRMAA tier avoided
Use FSA / DC-FSA balance before Dec 31 — healthcare FSA ($3,400) and DC-FSA ($7,500 under OBBBA) are generally use-it-or-lose-it. Submit claims and receipts before your plan's deadline.	All with FSA accounts	Low	Avoids forfeiting pre-tax FSA balance
RSU vesting and 10b5-1 trading window — RSUs vest as ordinary income; review your 10b5-1 plan or blackout calendar now to plan Q4 sales. Consider selling NQSOs in 2026 if exercising will push you into the 37% bracket regardless.	In-house at public companies	Med	Controls timing of W-2 RSU income recognition

The biggest lever: the NQDC election

For equity partners, no other Q4 move comes close. Non-qualified deferred compensation lets you elect today to receive future compensation in a later, lower-bracket year — typically after retirement or departure, when you have more control over your income. The mechanics:

Election deadline: Firms typically require deferral elections for the following year by December 15. The election must be irrevocable before the year begins (§409A).
Tax math: A partner in the 37% federal bracket paying 10.9% New York state tax faces a combined 47.9% marginal rate. Deferring $300,000 in compensation saves $143,700 today. That $143,700 — had it been paid — would have been spent or invested post-tax.
Distribution timing: You choose the distribution schedule when you elect. Options typically include lump sum at a specified future year, installments over 5–15 years, or separation from service. Most partners elect installments starting after retirement to spread income over lower-rate years.
Risk: NQDC is an unsecured general obligation of the firm. If the firm becomes insolvent, you are a creditor — not a secured account holder. This is the main reason not to defer unlimited amounts. See law firm bankruptcy planning for concentration-risk guidance.

First-year equity partners have a 30-day §409A initial deferral election window after becoming eligible for the plan. If you made equity partner in 2026 and have not yet made your initial election, do it now — the window closes quickly and the general December deadline does not extend it.

Tax-loss harvesting at BigLaw income levels

The typical BigLaw associate or partner has three sources of capital gain exposure: (1) taxable brokerage account growth and rebalancing, (2) appreciated securities received as compensation at prior employers, and (3) mutual fund capital gain distributions in December. At combined federal long-term capital gains rates of 23.8% (20% LTCG + 3.8% NIIT for income above $200,000 single / $250,000 MFJ), harvesting losses is worth more per dollar than at any other income level.

How it works

Identify positions in your taxable account with unrealized losses.
Sell the position to realize the loss.
Buy a similar but not substantially identical replacement to maintain your market exposure. (Example: sell Total Market ETF, buy Large Cap + Small Cap ETFs that together approximate total-market exposure.)
After 31 days, you can buy back the original position if you want.
Harvested losses offset capital gains dollar-for-dollar. Net losses above gains offset up to $3,000 of ordinary income per year; excess carries forward indefinitely.

BigLaw-specific planning notes

K-1 income and NIIT: Equity partner K-1 income above $200,000 (single) / $250,000 (MFJ) is already above the NIIT threshold. Realized long-term capital gains on top of that K-1 income face the 3.8% surcharge. Harvested losses can reduce NIIT exposure.
Partnership capital account: The firm capital account is not a taxable account — you cannot harvest losses from it. It is taxed on the way out under IRC §736.
December fund distributions: Many mutual funds declare capital gain distributions in December. If you hold mutual funds in taxable accounts, check distribution estimates on the fund company's website in October/November. Consider selling before the record date if the distribution will be large and you have an unrealized gain in the position.

Backdoor Roth: the $7,500 move everyone above $153,000 should make

Direct Roth IRA contributions are phased out at $153,000–$168,000 for single filers and $242,000–$252,000 for MFJ in 2026.² Every BigLaw associate and partner is well above these limits. But the backdoor Roth — a two-step process — eliminates the income restriction entirely.

Contribute $7,500 to a traditional IRA. Because you are above the income limit for deductibility, this is a nondeductible (after-tax) contribution. File Form 8606 with your return to track the basis.⁴
Convert the traditional IRA to a Roth IRA. If you have no other pre-tax IRA money, the conversion is tax-free (you already paid tax on the contribution).

The pro-rata rule trap: If you have any pre-tax traditional IRA money (deductible contributions, rollover from old 401(k)), the IRS treats all your IRAs as one pool. A $7,500 conversion is taxable proportionally. Example: if you have $67,500 in a pre-tax rollover IRA and $7,500 nondeductible, 90% of any conversion is taxable. The fix: roll the pre-tax IRA into your current firm's 401(k) before December 31, leaving only the nondeductible basis. Then convert.

Charitable giving before year-end

Two OBBBA 2026 changes affect charitable planning for high-income attorneys:

35% AGI cap for 37%-bracket filers: If your taxable income is in the 37% bracket, cash charitable deductions are capped at 35% of AGI — not the standard 60%. This makes donating appreciated securities more attractive: the deduction is the full fair market value (subject to 30% AGI cap for public charities), and you permanently avoid the embedded capital gain.
0.5% AGI floor: Under OBBBA, charitable deductions must exceed 0.5% of AGI to be deductible. At $500,000 income, that floor is $2,500 — easily cleared by most donors.

Two strategies to execute before December 31:

Donor-advised fund (DAF) bunching: Contribute 2–3 years of planned charitable giving into a DAF this year in one lump sum. Claim the itemized deduction in 2026 when your income is high (bonus year, high K-1 year). Grant from the DAF to charities over time. No rush on the grants — the DAF holds the money indefinitely.
Direct appreciated stock donation: Transfer appreciated securities (held more than one year) directly to your DAF or qualified charity. You deduct the fair market value and permanently avoid the capital gain. At 20% LTCG + 3.8% NIIT + state, the combined savings can exceed the charitable deduction itself on highly appreciated positions.

For equity partners 70½ or older: the Qualified Charitable Distribution (QCD) limit is $111,000 for 2026. QCDs come directly from your IRA to the charity and reduce your MAGI — unlike a regular charitable deduction, QCDs reduce income at the top-line level, which is what determines IRMAA and provisional income for Social Security taxation.

Key 2026 year-end deadlines

Deadline	Date	Action
NQDC deferral election	~Dec 15 (firm-specific)	Submit election form to elect next year's comp deferral
401(k) deferral change	Check with HR; typically mid-Dec	Increase deferral to reach $24,500 limit in final paychecks
HSA lump-sum contribution	Apr 15, 2027 (prior year allowed)	Contribute balance of $4,400 / $8,750 limit
Traditional IRA for backdoor Roth	Dec 31 for conversion; Apr 15, 2027 for contribution	Contribute $7,500; convert before year-end if possible
Pre-tax IRA rollover to 401(k)	Dec 31	Must be complete before year-end to fix pro-rata rule
Tax-loss harvesting	Dec 1 practical cutoff (31-day wash-sale window)	Sell losing positions; wait 31 days to buy back same security
DAF contribution / stock donation	Dec 31	Donate to DAF or directly; must be transferred, not just initiated
FSA / DC-FSA claims	Check plan document; often Dec 31 or Mar 15 grace	Submit receipts; use balance before forfeiture
Roth conversion	Dec 31	Execute in brokerage; cannot be undone after year-end
Q4 estimated tax payment	Jan 15, 2027	Pay to avoid IRC §6654 underpayment penalty
Prior-year HSA contribution	Apr 15, 2027	Can apply to 2026 limit until tax filing deadline

Year-end by career stage

Career stage	Top 3 Q4 moves	Unique risk
Y1–Y4 Associate	Max 401(k) · Backdoor Roth · Open enrollment HDHP/HSA	W-4 under-withholding on bonus — 22% withheld but 35–37%+ owed
Y5–Y8 Pre-partnership track	Max 401(k) · Backdoor Roth · Begin capital contribution savings	Refi student loans too soon → close PSLF option before deciding to leave BigLaw
Non-equity partner	Max 401(k) · Backdoor Roth · Review tax withholding on guaranteed payments	Guaranteed payments taxed differently than W-2 — may need estimated payments depending on firm structure
First-year equity partner	NQDC initial election (30-day §409A window) · Solo 401(k) or firm plan decision · Build Q4 estimated tax reserve	SE tax shock: self-employment tax on K-1 income not withheld; first quarterly payment due before year-end
Senior equity partner	NQDC election · IRMAA management · Cash balance plan funding	NQDC concentration risk: total deferred balance vs. firm solvency; diversify payout schedules
In-house counsel (public co.)	RSU vesting review · 401(k) · Backdoor Roth	RSU vesting inside a trading blackout — automatic sell-to-cover may happen at an unfavorable price; plan election changes for next year's grants

What you can accomplish in one conversation

A fee-only financial advisor who works with BigLaw attorneys can, in a single meeting:

Run your NQDC election analysis (how much to defer, which distribution schedule, how your current vs. expected retirement rate affects the decision)
Model your Roth conversion opportunity and size it precisely against your 2026 tax bracket
Audit your taxable account for tax-loss harvesting candidates without triggering wash-sale issues in your 401(k) or spouse's accounts
Confirm your estimated tax safe harbor position before the Q4 payment is due

The cost of missing a December 15 NQDC deadline at a 50% combined marginal rate is not recoverable. An advisor engagement that prevents one missed election pays for itself many times over.

Get matched with a BigLaw financial specialist

Answer a few questions about your role and situation. We'll match you with a fee-only advisor who works with lawyers — someone who understands NQDC elections, partnership capital, and the Q4 tax calendar your generalist advisor misses.

Sources

IRS, 401(k) limit increases to $24,500 for 2026, IRA limit increases to $7,500 (IRS Rev. Proc. 2025-32). HSA limits per Rev. Proc. 2025-19. Standard deduction and brackets adjusted per OBBBA July 2025.
IRS, Roth IRA income and contribution limits 2026. Phaseout single: $153,000–$168,000; MFJ: $242,000–$252,000.
IRS, Tax inflation adjustments for 2026 including OBBBA amendments. Standard deduction: $16,100 single / $32,200 MFJ. 37% bracket: $640,600+ single / $768,600+ MFJ.
IRS, About Form 8606 — Nondeductible IRAs. Required when making nondeductible IRA contributions for the backdoor Roth strategy.

Tax values verified September 2026. NQDC election deadlines vary by firm plan document — confirm yours directly with your firm's benefits administration. Content is for educational purposes; consult a qualified tax advisor for your specific situation.