Washington’s calendar is forcing a practical planning deadline for many taxpayers: a suite of individual provisions enacted in the 2017 Tax Cuts and Jobs Act (TCJA) is scheduled to expire after 2025. That statutory sunset could materially change tax brackets, deductions and credits beginning with calendar-year 2026 returns. Tax planning specialists are already advising clients to reassess timing for income and deductions, re‑examine filing‑status decisions and recalibrate estimated taxes.
What’s at stake
The TCJA lowered individual rates and broadened several provisions for 2018–2025. If Congress takes no action, a number of these items will revert to their pre‑2018 rules for tax year 2026. The practical consequences include narrower tax brackets or higher marginal rates, smaller standard deductions and the potential return of pre‑TCJA thresholds that determine capital‑gains brackets and many credits. For example, the top ordinary rate that applied before 2018 was 39.6% (compared with 37% under the TCJA schedule); that higher top rate is one of several specific changes that could reappear.
Why timing matters
- Tax bracket changes affect not only ordinary income but also the taxable‑income thresholds that determine long‑term capital gains and qualified dividend rates.
- Reductions in the standard deduction or restoration of pre‑TCJA exemptions will change whether itemizing remains worthwhile.
- Modifications to credit phaseouts and income thresholds will influence the value of deferring or accelerating income and deductions.
Concrete moves advisors are recommending now
Because the 2026 environment is likely to be higher taxed for many taxpayers if the sunset occurs, many advisors favor actions that lock in 2025’s rules. The appropriate moves depend on an individual’s circumstances, but several recurring themes have emerged.
1. Revisit timing for capital gains and realizations
Clients with planned sales of appreciated assets should run the numbers for 2025 versus 2026. Realizing long‑term capital gains in 2025 could keep gains taxed under 2025 thresholds and marginal rates, whereas pushing sales to 2026 could expose proceeds to higher effective rates if ordinary brackets widen or taxable‑income thresholds shift. Small‑business stock exemptions, installment sale timing and gains from second homes warrant the same calendar‑year scrutiny.
2. Bunch deductions while itemizing remains relatively generous
If standard deductions shrink in 2026, bunching itemizable deductions—charitable gifts, medical expenses that exceed thresholds, and certain state and local tax planning—could be more advantageous in 2025. Taxpayers close to the standard deduction threshold should model a two‑year plan to determine whether accelerating deductible expenses into 2025 yields a larger combined tax benefit.
3. Reassess Roth and retirement moves with bracket forecasts
When ordinary rates are expected to rise, converting traditional IRAs to Roth IRAs in a lower‑rate year can be attractive because the conversion is taxed as ordinary income. That said, conversions affect taxable income and may push taxpayers into higher capital‑gains thresholds or increase exposure to surtaxes; advisors recommend running both single‑year and multi‑year scenarios before acting.
4. Update estimated‑tax strategies
Any acceleration of income into 2025 — or accelerated recognition of gains — requires updated withholding or estimated‑tax payments. Taxpayers who materially change the timing or scale of income this year should re‑calculate quarterly estimated taxes or use withholding safe harbors to avoid underpayment penalties. Consider whether the annualized or safe‑harbor methods better reflect the new income pattern for 2025.
5. Re‑evaluate filing‑status timing for life‑event decisions
Marriage, separation or divorce decisions that cross the 2025 year‑end can have different tax consequences under the two regimes. Under the current schedule, married filing jointly may be more favorable in 2025 than in 2026 if bracket structures change. Conversely, divorce timing that splits income across tax years may produce meaningful differences in combined tax liabilities. Clients facing these life events should run parallel returns for 2025 and 2026 as part of their planning.
Practical examples
Consider a high‑earner contemplating a $500,000 stock sale currently scheduled for 2026. If bracket reversion restores a higher top rate and moves taxable‑income thresholds so the sale would be taxed at a higher capital‑gains threshold, shifting the sale to late 2025 could yield a material tax saving. Similarly, a homeowner with $30,000 in deductible improvements and state‑local taxes might benefit from accelerating those payments into 2025 to clear the itemizing threshold while the standard deduction remains larger under TCJA rules.
Limitations and legislative uncertainty
All planning must begin from the premise of legislative uncertainty. Congress could extend, phase out, or alter the TCJA expirations before they take effect. Because the political landscape can change quickly, advisors emphasize flexible planning: model both outcomes, prioritize reversible moves (timing income or deductions), and avoid irreversible transactions that assume a particular legislative outcome.
State conformity is another variable: some states will conform to federal changes automatically, while others will decouple or pass offsetting measures. State income‑tax exposure can materially alter the benefit of federal‑level maneuvers.
Next steps for advisers and taxpayers
- Run forecasted 2025 vs. 2026 tax returns under both the TCJA‑extended and TCJA‑sunset scenarios.
- Identify high‑impact items (capital gains, large deductible items, retirement conversions, life events) and prioritize timing flexibility.
- Recalculate estimated taxes and withholding immediately after any decision to accelerate income or realize gains.
- Document assumptions and maintain a contingency plan if Congress acts before year‑end.
For tax‑planning enthusiasts and professionals, the coming 18 months will reward disciplined scenario planning. Locking in favorable 2025 treatment where appropriate—and keeping plans reversible—will be the distinguishing practice for advisors helping clients navigate the TCJA sunset risk as 2026 approaches.