Year-end tax planning is always important, but 2025 presents an unusually high-stakes planning environment. With the Tax Cuts and Jobs Act provisions scheduled to sunset after December 31, the decisions made in the final months of the year could have lasting consequences—particularly for business owners navigating the intersection of income tax planning, estate tax planning, and the uncertain legislative landscape.
Income Acceleration vs. Deferral
The fundamental year-end planning question—whether to accelerate income into the current year or defer it to the next—takes on new urgency when tax rates may change. If TCJA rates expire and the pre-2018 rate structure returns, the top marginal rate increases from 37% to 39.6%. Business owners who expect to be in the top bracket should consider whether accelerating income into 2025 at the lower rate produces a better result than deferring to 2026 at the potentially higher rate.[1]
Conversely, deductions may be worth more in 2026 if rates increase. Business owners who can control the timing of deductible expenses should evaluate whether deferring deductions to 2026 would produce larger tax savings at higher rates. This analysis requires comparing the time value of the current deduction against the higher rate benefit of the future deduction.
Roth Conversions at Current Rates
If 2025 is the last year of TCJA rates, it represents the final opportunity to convert traditional IRA and 401(k) balances to Roth accounts at the lower rate structure. A Roth conversion triggers ordinary income equal to the converted amount, but all future growth and distributions are tax-free. If rates increase in 2026, the cost of converting in future years will be higher—making 2025 the optimal year for conversion for many taxpayers.[2]
Section 199A Planning
If the Section 199A qualified business income deduction expires after 2025, the effective tax rate on pass-through business income increases significantly. Business owners should consider whether accelerating qualifying business income into 2025 to capture the 199A deduction produces a better result than deferring to 2026 when the deduction may no longer be available. This analysis interacts with the income acceleration decision above and requires a comprehensive calculation of the combined effect.[3]
Estate Tax Gifting
The most consequential year-end planning opportunity may be on the estate tax side. If the enhanced gift and estate tax exemption ($13.99 million per person in 2025) reverts to approximately $7 million in 2026, 2025 is the last chance to use the higher exemption. High-net-worth individuals who have not fully utilized their exemption should evaluate strategies including spousal lifetime access trusts (SLATs), irrevocable life insurance trusts (ILITs), and other completed gift structures that can lock in the current exemption level.[4]
Business-Specific Strategies
Additional year-end strategies for business owners include maximizing retirement plan contributions before December 31 (with the exception of SEP IRAs, which can be funded until the extended return due date), evaluating capital expenditures that may qualify for bonus depreciation or Section 179 expensing in 2025, reviewing estimated tax payments and making adjustments to avoid underpayment penalties, and considering the timing of asset sales to manage capital gains. The interaction of these strategies with the TCJA sunset creates a planning environment of unusual complexity that warrants close collaboration with a tax advisor.[5]