2026 Year-End & Mid-Year Tax Planning Guide
The highest-impact moves to make between now and when you file your 2026 return — organized by deadline, each linked to a calculator or guide.
What are the highest-impact 2026 year-end tax moves?
The biggest 2026 moves are maxing tax-advantaged accounts (401(k), IRA, HSA), harvesting capital losses or 0%-bracket gains, using OBBB's permanently restored 100% bonus depreciation on newly acquired business and rental assets, giving strategically under OBBB's new charitable rules, and funding a Trump Account for eligible newborns. OBBB (P.L. 119-21) made the TCJA brackets permanent, so 2026 is the first full 'normal' planning year under permanent post-TCJA rates — the urgency shifts from 'lock in low rates' to durable, repeatable moves.
- OBBB made the TCJA rate brackets permanent — no 2026 rate-hike deadline to plan around.
- 100% bonus depreciation is permanent for property acquired after Jan 19, 2025; property acquired earlier gets 40% if placed in service in 2025, 20% in 2026.
- New for 2026 giving: a below-the-line charitable deduction for non-itemizers (up to $1,000 / $2,000 MFJ, cash to public charities — reduces taxable income, not AGI), and a 0.5%-of-AGI floor for itemizers.
- Trump Accounts launch July 2026 with a one-time federal seed for U.S.-citizen kids with an SSN born 2025–2028, paid once the child's automatically enrolled account is claimed in the Trump Accounts app (as of Oct 1, 2026); also confirm the Form 4547 election.
- IRA and HSA contributions still have until the April 15, 2027 filing deadline.
Source:One Big Beautiful Bill Act (P.L. 119-21) & Rev. Proc. 2025-32
Do now (mid-2026)
Run a mid-year withholding checkup
W-2 employees, especially after a raise, bonus, marriage, or second job.
Half the tax year is still ahead — a W-4 tweak now avoids either a surprise April bill or a giant interest-free loan to the IRS.
Run the W-4 toolCheck your ACA subsidy cliff distance
Marketplace-insured households near 400% of the poverty line.
The enhanced ACA subsidies expired and the 400% FPL cliff is back — with OBBB removing all repayment caps for 2026. Check your distance to the cliff and report income changes to the Marketplace now.
Check the cliffFund an HSA under the new Bronze/Catastrophic rules
Marketplace Bronze/Catastrophic enrollees (newly HSA-eligible in 2026).
OBBB made all Exchange Bronze and Catastrophic plans HSA-qualified starting 2026 — if you downgraded plans after the subsidy cliff, you likely unlocked an HSA. Fund it before year-end.
Model the HSA benefitElect the PTET SALT workaround before your state's deadline
S-corp and partnership owners in states with a Pass-Through Entity Tax regime.
OBBB left PTET untouched — the House-draft SSTB restriction died in the Senate. With the personal SALT cap phasing down toward $10,000 for high earners, PTET is more valuable than ever. Election deadlines vary by state and several require MID-YEAR elections — check yours now, don't wait for filing season.
Model the PTET decisionGot a CP14? Verify it, then request First-Time Penalty Abatement
Taxpayers who filed or paid late and received an IRS CP14 balance-due notice (spring–summer 2026 wave).
Pull your account transcript before paying — payments get misapplied. If the notice is right and you filed the return on time (extensions count), an installment agreement drops the failure-to-pay rate from 0.5% to 0.25%/month while it's in effect; a late-filed return keeps the 0.5% rate. If you have three prior clean years, call the number on the notice and request First-Time Penalty Abatement — both FTF and FTP penalties come off, along with interest on the abated penalties.
Estimate penalties + interestTime a 2026 gain's QOF investment for January 2027
Anyone with a 2026 capital gain considering Opportunity Zone deferral.
OBBB made Opportunity Zones permanent, and the new rules apply to QOF investments made on or after Jan 1, 2027 (Notice 2026-40). A 2026 gain whose 180-day window reaches into 2027 (a sale on or after July 6, 2026; pass-through gains can have later windows) can be invested in a QOF in early 2027 and deferred under the new rules: taxed five years after the investment, with a 10% basis increase at five years and the 10-year exclusion on the fund's growth. Don't recognize the gain and invest after-tax cash: only amounts invested with a deferral election get OZ tax benefits (IRC §1400Z-2(e)(1)). A 2026 QOF investment defers the gain only to Dec 31, 2026, though it keeps the 10-year election. Gains deferred under the old rules are taxed on the 2026 return regardless.
Read the OZ 2.0 guideCheck your real 2027 Social Security raise
Social Security recipients whose Medicare Part B premium comes out of their benefit.
SSA announces the 2027 COLA in mid-October and the 2027 Part B premium follows from CMS. The calculator takes the premium out of the COLA, applies the hold-harmless rule, and shows the change in your January deposit.
Estimate your real raiseBefore Dec 31, 2026
Max your 401(k) or 403(b)
Anyone with a workplace retirement plan.
Contribute up to the 2026 elective-deferral limit; workers 50+ add the catch-up (ages 60–63 get the higher super catch-up). If your 2025 FICA wages from the employer sponsoring the plan exceeded the indexed threshold, any 2026 catch-up must be designated Roth (SECURE 2.0 §603); it's last year's wages from this employer that count, not this year's income. If that plan has no Roth option, you can't make catch-up contributions there.
Run the numbersConsider a Roth conversion
Pre-RMD retirees and anyone in an unusually low-income year.
OBBB made the TCJA brackets permanent, so there's no 2026 rate-hike deadline — but converting to fill a lower bracket still cuts future RMDs and grows tax-free thereafter.
Model a conversionHarvest capital losses
Taxable-brokerage investors with unrealized losses.
Realize losses to offset realized gains plus up to a capped amount of ordinary income; watch the 30-day wash-sale rule when rebuying the same or a substantially identical security.
Read the playbookHarvest gains in the 0% LTCG bracket
Investors with room left under the 2026 0% long-term-gains threshold after counting the gain.
Long-term gains are taxed at 0% only up to the 2026 threshold, and they stack on top of your other taxable income. Harvest just enough gain to fill the room that's left, then rebuy to step up basis (no wash-sale rule for gains). Gain past the threshold is taxed at 15% (20% on taxable income above $545,500 single / $613,700 joint for 2026), and the extra income can still raise Social Security taxation, cut an ACA premium credit or trigger IRMAA.
Find your 0% roomUse 100% bonus depreciation
Business owners and landlords buying or improving assets.
OBBB made 100% bonus depreciation permanent for qualified property acquired after Jan 19, 2025 (a written binding contract signed earlier fixes the acquisition date). Property acquired before Jan 20, 2025 stays on the old phase-down: 40% if placed in service in 2025, 20% in 2026. Place newly acquired assets in service before year-end, or commission a cost-segregation study on a recent purchase, after checking when the building was acquired.
Estimate the deductionTrue up your quarterly estimates
Self-employed filers and W-2 households with big side or investment income.
Hit a safe harbor (100% of last year's tax, 110% if prior-year AGI was above the high-income threshold, or 90% of this year's) to avoid the underpayment penalty. Q3 was due Sept 15; Q4 is due Jan 15, 2027.
See the safe-harbor rulesModel an S-corp election
Profitable sole props and single-member LLCs.
If net profit keeps climbing, check whether electing S-corp status saves enough payroll tax to justify the added payroll, admin, and reasonable-comp scrutiny.
Compare S-corp vs sole propGive strategically under the new OBBB rules
Anyone who donates to charity — itemizer or not.
OBBB adds a permanent non-itemizer cash-gift deduction (below-the-line — reduces taxable income, not AGI); itemizers must now clear a 0.5%-of-AGI floor before the first dollar counts, so bunching gifts or using a donor-advised fund matters more than ever.
Compare 2025 vs 2026Fund a Trump Account for a young child
Parents of U.S.-citizen children with an SSN born 2025–2028.
Claim the child's automatically enrolled Trump Account in the official Trump Accounts app (Treasury, Oct 1, 2026), confirm the Form 4547 pilot election, and contribute up to the annual family cap.
Project the accountContribute to a 529 plan
Parents, grandparents, and future students saving for education.
Many states give a state income-tax deduction or credit for 2026 contributions. Front-loading also buys more years of tax-free growth.
Model a 529Use your annual gift-tax exclusion
High-net-worth households planning estate transfers.
Gift up to the 2026 annual exclusion per recipient (spouses can split gifts) to shrink your taxable estate without eating into the lifetime exemption.
See the 2026 figureCheck your 2027 IRMAA tier before adding 2026 income
Medicare enrollees, and anyone within two years of enrolling.
Your 2027 Part B and Part D surcharges come from your 2025 return. Income you add before December 31 (a Roth conversion, a capital gain, a first RMD) lands on your 2026 return, which sets 2028 IRMAA, so check how close you sit to the next tier first.
See the 2027 IRMAA tiersTake your RMD, or give it as a QCD, by Dec 31
IRA owners at their RMD age; QCDs are open from age 70½.
Every RMD after your first is due by December 31. A qualified charitable distribution counts toward the RMD and stays out of your income, but it has to leave the IRA by December 31 to count for 2026.
QCD rules and the 2026 limitSet your 2027 401(k) deferral before January
Anyone with a 401(k), 403(b) or governmental 457(b).
Pick next year's per-paycheck deferral before your first 2027 paycheck. Switch the retirement contribution calculator to 2027 to size it against the 2027 limit (currently projected).
Open the calculator and choose 2027Before you file (April 2027)
Top up your IRA and HSA
Earners with an IRA and anyone on an HSA-eligible HDHP.
You can make 2026 IRA and HSA contributions until April 15, 2027 — the unextended due date of your 2026 return — even if you file earlier, and an extension doesn't push it back. Tell the custodian the contribution is for 2026. The HSA is triple-tax-advantaged — deductible in, tax-free growth, tax-free out for medical.
Model the HSA benefitClaim the new OBBB deductions
Tipped and overtime workers, US-assembled car buyers, and seniors 65+.
Track qualified tips, FLSA overtime, and US-assembled car-loan interest now — 2025 W-2s don't separate them. Claim the totals on the new Schedule 1-A when you file.
Read the Schedule 1-A guideRelated planning tools
Sources & References
Primary references used for this content
Your Federal Income Tax
For Individuals
View on irs.gov
2026 Tax Brackets and Adjustments
2026 inflation adjustments (incl. OBBBA changes)
View on irs.gov
One Big Beautiful Bill Act
Permanent TCJA rates, 100% bonus depreciation, and new deductions
View on congress.gov
✓3 primary sources; links re-checked on a weekly rotation by the source watcher
Disclaimer: This calculator provides estimates for educational purposes only. Not tax, legal, or financial advice. Results may vary based on your specific circumstances. Consult a qualified CPA or tax professional for personalized guidance.