Higher inflation cuts both ways at tax time. On the upside, it pushes many federal tax thresholds higher each year — meaning wider brackets, larger standard deductions, and increased exemptions. On the downside, a permanent change made in 2017 ensures those increases come in slightly smaller than they would have under the old inflation measure, and a long list of important thresholds are not adjusted at all. Here is what is changing for 2027, along with key 2026 updates on charitable giving, Opportunity Zones, and vacation-home rentals.
1. What Inflation Will (and Won't) Lift for 2027
Because many federal tax parameters are indexed to inflation, a higher-inflation environment generally means wider tax brackets and more generous thresholds. Items expected to rise for 2027 include:
- Income tax brackets, standard deductions, and the child tax credit
- Adoption credit, AMT exemptions, and the foreign earned income exclusion
- Annual gift-tax exclusion and lifetime estate-and-gift-tax exemption
- Income thresholds for 0%, 15%, and 20% long-term capital gains rates
- Income limits on U.S. savings bonds used for education
However, a permanent change enacted in the 2017 tax law switched the inflation measure from the standard CPI-U to the Chained CPI-U. Economists argue the Chained CPI-U more accurately captures how spending patterns shift as prices rise — but it also produces slightly smaller annual adjustments, compounding over time to meaningfully reduce the value of inflation-indexed tax breaks relative to what they would have been.
Not Indexed to Inflation — These Thresholds Are Frozen
Several high-impact thresholds have never been updated for inflation, including: the home-sale gain exclusion ($250,000 / $500,000 joint, unchanged since 1997); income thresholds for the 3.8% net investment income tax and the 0.9% Medicare surtax on earned income; provisional income levels at which Social Security benefits begin to be taxed; the $25,000 rental loss allowance phase-out ($100,000–$150,000 modified AGI); and the $750,000 home acquisition debt cap for mortgage interest deductions.
Bipartisan legislation has been introduced that would raise the home-sale exclusion to $500,000 for single filers and $1 million for joint filers, and index it to inflation going forward. The proposal faces a difficult path — it is unlikely to advance as a standalone bill and would need to be attached to a larger tax package — but its prospects are modestly better than in prior years.
2. Charitable Giving: Two Key 2026 Changes
Two significant changes to charitable deduction rules took effect this year and will show up on 2026 returns filed in 2027:
- Nonitemizers now get a limited above-the-line deduction. Taxpayers who take the standard deduction can deduct up to $1,000 in cash charitable contributions ($2,000 for joint filers) directly on their 2026 returns — a benefit that had previously expired.
- Itemizers face a new 0.5% AGI floor. Charitable contributions on Schedule A are now deductible only to the extent they exceed 0.5% of adjusted gross income — a structure similar to the 7.5%-of-AGI floor that applies to medical expenses, though far less restrictive.
Also worth noting for donors this year: donating the right to use a vacation home or timeshare to a charity does not generate a charitable deduction, because you are giving only a partial interest in the property. Losses on the sale of a timeshare held for personal use are nondeductible. If you sell one at a gain, it is a taxable capital gain. Separate rules apply to timeshares held for rental or mixed use.
On the enforcement side, IRS has finalized regulations naming certain abusive charitable remainder annuity trust (CRAT) arrangements as listed transactions, requiring mandatory disclosure by taxpayers and their advisors. A separate appeals court ruling affirmed a Tax Court decision slashing a $23 million syndicated conservation easement deduction down to $480,000 and upholding a 40% penalty — a reminder that aggressive valuation strategies in donation planning carry serious risk.
3. Qualified Opportunity Zones: Now Permanent, With New Guidance
The Qualified Opportunity Zone (QOZ) program — which allows investors to defer capital gains by rolling proceeds into Qualified Opportunity Funds (QOFs) that support development in low-income communities — was originally set to expire in 2026. The "One Big Beautiful Bill" made it permanent. IRS has since issued Notice 2026-40 covering the program changes. Here is how the incentive works for gains realized after 2026:
- 180-day window. You have 180 days from the sale date to invest gain proceeds into a QOF and elect deferral on Form 8949.
- 5-year hold: 10% basis step-up. Hold the QOF investment for at least five years and your tax basis in the fund increases by 10% of the originally deferred gain.
- 10-year hold: appreciation goes untaxed. Hold for 10 or more years and you can elect to step up your basis to fair market value at the time of sale, meaning post-acquisition appreciation in the QOF is not taxed when you exit.
- Enhanced incentives for rural funds. Investing in a Qualified Rural Opportunity Fund carries additional tax benefits beyond the standard QOF structure.
Important — 2026 gains invested before 2027: If you have capital gains this year and invest them in a QOF before January 1, 2027, the transitional rules are less generous. The deferral runs only to December 31, 2026, and there is no 10% basis step-up. Anyone considering a 2026 QOF investment should consult a tax adviser before acting.
4. Vacation Home Rentals: The Tax Rules in Plain Language
The federal tax treatment of vacation homes depends heavily on how many days you rent the property versus how many days you use it personally.
- 14 days or fewer rented: tax-free rental income. If the property qualifies as your personal residence (your annual personal use exceeds the greater of 14 days or 10% of days rented at fair value), and you rent it out for 14 days or fewer, the rental proceeds are fully tax-free and need not be reported.
- More than 14 days rented: rental income is taxable. Rental expenses are deductible in proportion to rental use (days rented ÷ total days of personal and rental use), but deductions cannot exceed rental income. Report on Schedule E.
- Losses on a personal-residence rental are nondeductible and carry forward to offset future rental income. If the home is not a personal residence and you actively participate in the rental, up to $25,000 of losses can offset other income — but this allowance phases out between $100,000 and $150,000 of modified AGI and disappears entirely above $150,000.
One additional trap for vacation homeowners: if you donate the use of your home to a charity (for an auction prize, for example), the time used by the winning bidder counts as your personal use. That can tip you over the personal-use threshold and bar you from deducting rental losses — and you receive no charitable deduction, since you gave only a partial interest in the property.
5. Upcoming Deadline & a Word on IRS Audits
September 15 deadline for partnerships and S corporations. Calendar-year partnerships and S corps that filed for an extension on their 2025 returns must file by September 15, 2026. Missing this deadline carries a penalty of $255 per month (up to 12 months), multiplied by the number of partners or shareholders — a fine that adds up fast for larger entities.
IRS audit odds remain low — but computer notices are rising. While traditional audits dropped to fewer than 500,000 in fiscal year 2025 — partly due to a 28% reduction in IRS staffing over the past year — the agency is increasing its use of automated CP2000 notices that flag mismatches between reported income and information returns. These notices are not counted as audits in IRS statistics but function similarly, and they now bring the effective coverage rate to roughly 3.5 million returns. Filers who incorrectly claim the premium tax credit are specifically flagged as audit targets.
One more note for anyone pursuing interest abatement on a tax debt: the bar is high. You must prove the interest resulted from an unreasonable IRS delay or error, demonstrate a direct link between that error and the specific period of interest being challenged, and show you would have paid earlier but for the error. Oral advice from an IRS employee — even if it turns out to be wrong — is not binding on the agency.
Bottom Line: The combination of inflation-driven threshold increases, new charitable deduction rules, a permanent Opportunity Zone program, and tightening vacation-home rental rules means there are both new planning opportunities and new traps heading into the rest of 2026 and beyond. Schedule a strategy session with our team to review how these changes apply to your specific situation.
Questions? Contact our team of experienced CPAs for personalized guidance.
