Fall is a great time for a quick tax checkup. With the 2025 law, often called the One Big Beautiful Bill now impacting 2026 tax returns, a little planning before December 31 may help you avoid a surprise next spring.

1) Compare Your 2026 Income to 2025

A great place to start is your 2025 tax return. It can remind you what income was reported from your job, business, investments, rental property, side hustle, retirement accounts, and other sources.

This fall, compare last year’s numbers to what you expect for 2026. Ask yourself:

  • Did your wages increase or decrease?
  • Did you change jobs, retire, start a business, or pick up side income?
  • Did investment income, interest, dividends, or capital gains change?
  • Did your rental or business income look very different from last year?
  • Did you sell property, exercise stock options, receive a bonus, or take a retirement distribution?

Fall is a great time for an income check because enough of the year has gone by to see the pattern, but there is still time to make changes before December 31.

This matters even more for 2026 because several newer tax breaks may depend on your income.

2) Review Your Withholding or Estimated Tax Payments

Once you have a sense of your 2026 income, it is time to look at your tax payments. Nobody wants a surprise tax bill in April, and nobody wants to loan the government too much money interest-free if cash flow is tight.

For employees, 2026 is a good year to revisit Form W-4. The IRS updated the 2026 W-4 to reflect new deductions tied to the One Big Beautiful Bill. If you have not looked at your withholding in a while, this is the year to dust it off.

Consider reviewing your withholding if:

  • You work in a tipped occupation.
  • You regularly earn overtime.
  • You bought a qualifying vehicle and are paying interest on the loan.
  • You or your spouse are age 65 or older.
  • You have multiple jobs in the household.
  • You have significant non-wage income.

You owed tax or received a much larger refund than expected last year.

If you are self-employed, retired, or have investment income, estimated tax payments may be the better tool. A quick projection now can help you avoid penalties and large surprises later.

3) Consider Newer (or Easy-to-Miss) Deductions for 2026

Some deductions may be relatively new for 2026 returns because of the One Big Beautiful Bill. You do not need to memorize the rules, just flag these items early so you can bring the right paperwork:

  • Tips and overtime: If these are a meaningful part of your pay, ask whether you may qualify for a deduction and whether your withholding should be adjusted. Keep paystubs and year-end forms.
  • Car loan interest: If you bought a qualifying vehicle (or are still paying on a loan from a recent purchase), keep loan and interest paperwork.
  • Age 65+ (senior deduction): If you or your spouse are 65 or older, ask whether you qualify.
  • Charitable gifts even if you don’t itemize: If you give to charity but take the standard deduction, you may still be able to claim a limited deduction in 2026. Keep receipts.

4) Business Owners: Consider Year-End Purchases (But Plan First)

Business owners received several important updates under the 2025 Act, and fall is the perfect time to review equipment, vehicle, software, building improvement, and expansion plans.

If you own a business, fall is a good time to look at equipment, vehicles, software, and improvements you may want to buy before year-end.

Two common tax-friendly options are bonus depreciation and Section 179; both can allow you to write off qualifying purchases faster. The catch is timing and paperwork matter (and some purchases must be “in service” by year-end), so talk through your plan before you buy.

5) Keep Building Your Future (Retirement + HSA)

Planning for the near term should not stop you from saving for the future. Retirement contributions remain one of the most practical tax planning tools available.

Depending on your situation, consider whether you can contribute to:

  • A traditional IRA.
  • A Roth IRA.
  • An employer 401(k), 403(b), or similar workplace retirement plan.
  • A SEP IRA, SIMPLE IRA, solo 401(k), or other self-employed retirement plan.
  • An HSA, if you are eligible.

Some retirement contributions must be made by year-end, while others may be available after December 31 but before the tax filing deadline. The rules vary by account type, so do not assume you have unlimited time.

If your income is higher than expected, increasing retirement contributions before year-end may help reduce taxable income while also strengthening your long-term financial security. That is a treat worth considering.

If you can, keep funding retirement and health accounts. Even small increases can help with both taxes and long-term savings.

Also, HSAs are worth a fresh look in 2026, especially if you buy coverage through the Exchange or use direct primary care, because eligibility rules expanded for some plans.

Make Tax Planning a Treat, Not a Trick

Tax planning does not have to be frightening. The trick is to start before the year is over, when there is still time to make decisions.

Before the end of 2026, consider gathering:

  • Your 2025 tax return.
  • Recent paystubs for you and your spouse.
  • Business profit and loss reports.
  • Estimated tax payment records.
  • Investment income estimates.
  • Retirement contribution information.
  • HSA contribution and health plan information.
  • Charitable giving records.
  • Vehicle loan interest information.
  • Major purchase plans for your business.

Then talk to your advisor. A short fall planning meeting can help you adjust withholding, make smart estimated payments, capture newer deductions, and plan purchases before year-end.

Do a little planning now, and you may be able to enjoy the season with fewer tax-season scares later.