Every fall, I start hearing the same question from clients: "What do I actually need to get done before December 31st?"
It's a fair question, and a lot of the advice out there muddies it more than it clarifies. Some of it treats every tax move like it's got a hard deadline. Some of it acts like there are no deadlines. The truth is somewhere in between, and knowing which is which can help ease your anxiety and create a plan.
Consider this your year-end tax planning checklist: a few things that can't really wait, and a few that can. It’s worth noting if you're in a state without income tax, like here in Texas, that can change some things. For more on that, check out the FAQs section at the end of this blog.
401(k) and Employer Plan Contributions
This is the one with a real December 31st wall, and it comes down to mechanics more than anything else.
Employee deferral contributions to a 401(k) generally must be processed through payroll before the calendar year closes to count for that tax year. The 401(k) contribution deadline doesn't bend the way people sometimes assume it does. Once January hits, that window is generally closed for the prior year.
If you haven't reviewed what you've contributed so far this year, this is worth a conversation with your advisor before the year ends.
IRA Contributions
Unlike a 401(k), contributions to an IRA for a given tax year are generally allowed all the way up until the tax filing deadline the following spring. That doesn't mean it's not worth doing before year-end, but it’s also not the fire drill some people may treat it as.
Tax-Loss Harvesting
Tax-loss harvesting is a strategy designed to potentially offset capital gains and reduce your taxable income. The timing of this strategy matters because trades must settle before the end of the calendar year. If the trade settles after the year ends, it cannot be counted toward that tax year.
Charitable Giving and Bunching Donations
Charitable contributions, whether cash or through a donor-advised fund, generally need to be made by December 31st to count toward that tax year.
Some people decide to combine multiple years of giving into a single year, a strategy sometimes called "bunching charitable donations," depending on their individual tax situation and giving goals. It's not a fit for everyone, but it's worth understanding if charitable giving is already part of your financial plan.
Managing Adjusted Gross Income Through Qualified Investments
One strategy worth understanding, and one that touches a lot of the strategies above, is how certain investment vehicles may potentially help reduce your adjusted gross income for the year, which in turn may affect your overall tax liability.
Depending on your individual circumstances, contributions to certain qualified investments and tax-advantaged accounts made before December 31st could be reflected in this year's AGI rather than next year's. What actually qualifies depends heavily on your specific situation, so this is one to walk through with your advisor.
How to Use the Rest of Your Year
None of this is meant to be a countdown clock. It's meant to help you tell the difference between what genuinely needs your attention before the calendar turns and what you can think through more carefully in the new year.
Good tax planning, whether you're running a business or managing your personal wealth, isn't about reacting to a deadline. It's about knowing which ones are real early enough to actually do something about them.
If you want help figuring out which of these actually apply to your situation or want a clearer sense of your current tax liability before the year closes, schedule a time with me to talk it through.
Frequently Asked Questions
Does this work differently if I'm self-employed or own my business?
In some cases, yes. Business owners often have additional options around retirement plan contributions and business deductions that an individual wouldn't have. It's worth reviewing your specific structure with a professional before year-end, whether or not a business is part of the picture.
I already filed a tax extension. Do these deadlines still apply?
A filing extension generally applies to when you file your return, not to the underlying deadlines for contributions or other year-end moves described above. Those still tend to follow the calendar year regardless of your filing timeline. Confirm the specifics with your tax professional.
Does living in a state without income tax change any of this?
It can change the overall math, since there's one less tax layer to plan around in states like Texas. It doesn't eliminate the value of year-end planning, or change which deadlines are real. It just means the conversation looks a little different depending on where you live.
I'm retired. Does any of this apply to me?
Some of it, potentially. Required minimum distributions, in particular, carry their own year-end considerations. If you're retired and taking distributions, it's worth a conversation about how these deadlines intersect with your specific situation.