Unlock Savings with Tax Loss Harvesting

Let’s start with the sexy one in tax nerd land: Tax Loss Harvesting.

On paper, it sounds like a buzzword. In practice, it is simple. You sell investments that are down, lock in those losses, and use them to lower your tax bill.

Here is what that really means for you:

• You can use losses to offset capital gains.
• You can then use up to $3,000 of extra losses each year to reduce your ordinary income.
• Any leftover losses do not vanish; they carry forward into future years.

Think of it as building a little “loss bank” on your tax return. You tuck those losses away, and when you sell something with a significant gain later, your past self has already done some of the cleanup work.

You might look at the market this year and think, “Everything is up, I probably do not have losses.” Maybe, but maybe not. A handful of big names have driven a lot of recent returns. If you own individual stocks or use something like direct indexing, you can have a strong portfolio result and still have losers hiding inside. Those positions are your candidates for tax-loss harvesting.

A quick but essential warning: wash sale rules. If you sell an investment at a loss, then buy the same or substantially identical investment within 30 days before or after the sale, the IRS disallows the loss. You do not want that. So if you harvest a loss in a fund or stock, swap into something different enough that it is not “substantially identical.”

Now, you might also hear about tax gain harvesting. That is the cousin of tax loss harvesting, where you intentionally sell positions with gains, usually in lower tax years or when rates might increase soon. Going into 2026, you are not staring down an immediate hike in capital gains rates, so gain harvesting is more of a niche move this year. Loss harvesting is the star of the show for most high-income households.

Bottom line: if you have a taxable brokerage account, December is a great time to review what is up and what is down, and see if there are any strategic losses to lock in.

Do Not Miss Your Required Minimum Distributions (RMDs)

If you are in your early to mid-70s, or you have parents in that age range, this one is huge.

Required Minimum Distributions (RMDs) are the forced withdrawals from pre-tax retirement accounts, like traditional IRAs. You got a lovely tax deferral for years. Now Uncle Sam wants his cut.

For most people today, RMDs start in the 73-75 year age range, depending on your birth year and the recent rule changes. Once you are in RMD territory, you have to withdraw at least your required amount each year.

Key facts for 2025:

1. The RMD amount is calculated based on your account balance and age.
2. The deadline is December 31 for most years.
3. If you miss it, the IRS can attach hefty penalties.

Penalties here are not cute. You do not want to learn about them the hard way. If you, your spouse, or your parents are in that RMD age window, you should be asking, “Have the RMDs been taken yet for 2025?”

Most of the time, you will see RMDs come out of an IRA. They can also apply to some other pre-tax accounts, depending on your situation. The key is simple: do not assume it “just happens.” Make sure it was done, and done for the full amount.

If you are charitably inclined, keep reading, because there is a way to satisfy RMDs and cut your tax bill at the same time.

Use QCDs to Support Charity and Cut Taxes

If you are donating to charity and also taking RMDs, you have a very nice tool in your kit: the Qualified Charitable Distribution, or QCD.

What is a Qualified Charitable Distribution?

A QCD lets you send part or all of your IRA distribution directly to a qualified charity. You do not receive the money; the charity does. Since the money never hits your tax return as income, that portion is not taxable to you.

Here is why QCDs are so powerful:

• The amount you send to charity counts toward your RMD.
• You avoid income tax on that RMD portion.
• The charity still gets the full amount, tax-free.
• You do not need to itemize deductions to get the benefit.

Compare that to writing a check from your checking account. That checking account money is already fully taxed. You are using after-tax dollars to give. With a QCD, you are using pre-tax dollars instead of taking that income yourself.

A few guardrails:

• The current annual QCD cap is $100,000 per person.
• You must be at least 70½ years old to do a QCD. That age did not change when the RMD age changed, which is a weird little quirk in the code.
• The QCD has to go to a qualified 501(c)(3) charity.

If you are RMD age and you do not need all that income to live on, QCDs are one of the cleanest ways to give.

Key Deadlines and Reporting Tips for QCDs

QCDs are a December 31 deadline item, and there is an extra twist: the charity has to actually receive and cash the funds by year-end. Sending a check on December 30 is cutting it very close.

If you are watching the calendar in early December and thinking about a QCD, do not wait until the final days of the year. Get those requests in now so the money clears in time.

Starting with the 2025 tax year, QCDs are supposed to appear more clearly on your 1099-R. That is nice in theory, but you should not trust the paperwork blindly. If your accountant does not know that a piece of your IRA distribution was a QCD, they may treat the whole thing as taxable.

So write this down somewhere: tell your accountant it was a QCD. Make sure they see the amount and mark it correctly.

Roth Strategies to Boost Your Future Tax-Free Income

Roth strategies are where long-term tax planning gets fun. You have three main Roth plays to think about as the year wraps up.

Roth Conversions: Fill Lower Brackets on Purpose

A Roth conversion means you move money from a pre-tax IRA to a Roth IRA. You pay income tax on the amount you convert this year, and then that money grows tax-free going forward.

You do this on purpose to “fill up” your lower tax brackets now, especially if you expect your tax rate to be higher later. That could be in retirement, after a big promotion, or after certain tax rules sunset.

Key point for 2025: Roth conversions are a calendar-year decision. If you want the conversion to count for 2025, you must complete it by December 31. There is no going back in March and saying, “Actually, I wanted that to be 2025.”

Backdoor Roth IRA: Great for High Earners

If your income is too high to contribute directly to a Roth IRA, the Backdoor Roth IRA move is still one of the best tools you have.

In short, you:

1. Make a non-deductible contribution to a traditional IRA.
2. Convert that contribution to a Roth IRA.

You have a bit more flexibility with timing here. You can make a 2025 IRA contribution all the way up to your tax filing deadline in 2026, and then convert it. That still works.

That said, doing the contribution and the conversion in the same calendar year keeps your IRS Form 8606 much cleaner. The 8606 form tracks your basis in non-deductible IRAs, and when you spread things over multiple years, that form can turn into a mess. Same-year moves keep the paper trail simple.

Mega Backdoor Roth: Supercharging Retirement Savings

If your employer’s retirement plan allows it, the Mega Backdoor Roth lets you pour a lot more money into Roth territory.

This usually involves:

• Making after-tax contributions to your 401(k) beyond the regular deferral limit.
• Then, convert those after-tax dollars to a Roth inside the plan or into a Roth IRA.

The payoff is big: a much larger pool of Roth dollars growing tax-free for the rest of your life.

This is also a calendar-year play. If your plan allows for it and you want to take advantage in 2025, you need to get the contributions and conversion done by December 31.

Fix Your W-4 Withholdings for Better Cash Flow

If you are tired of getting a giant tax bill every April, or you keep getting a massive refund and calling it “free money,” your W-4 is probably off.

A large refund means you gave the IRS an interest-free loan all year. A huge surprise bill means you are under-withheld and may also be flirting with penalties.

For most high earners, a sweet spot is roughly $1,000 owed or refunded. If your income is very high, you may need a wider range, but the concept is the same. You want to be close, not thousands of dollars off.

Here is how to tighten things up:

1. Look at your 2024 or early 2025 tax outcome. Big refund or big bill?
2. Use that information to adjust your W-4 with your employer before the new year.
3. If you can, run the numbers with a CPA or financial planner while they still have time and brain space before tax season explodes.

You do not have a hard December 31 deadline on W-4 changes, but year-end is a natural time to reset so your 2026 paychecks are right from the start.

Finish Strong: Year-End Contribution Deadlines

Next up, the big “use it this year or lose it” contribution items.

Workplace Plans as an Employee

If you are an employee contributing to a workplace plan like a 401(k), 403(b), or 457(b), your employee contributions are a hard December 31 deadline item.

That is the money you choose to defer from your paycheck. If you want those contributions to count for 2025, the deferrals must come out of paychecks paid in 2025. You cannot decide in February 2026 that you want to go back and add more employee deferrals to 2025.

Your employer contributions, like profit sharing, follow different rules. Employers often have until their tax filing deadline to make that piece. That is their problem, not yours.

If you are a physician employed by a hospital, this is where you check how close you are to maxing out your plan and whether you want to bump up deferrals for the final pay periods.

Solo 401(k)s, IRAs, HSAs, and Other Flexible Accounts

If you have 1099 income and use a Solo 401(k), the Secure Act 2.0 gave you more breathing room. You can now make both employee and employer contributions up until your tax filing deadline in many cases. That is a big upgrade from the old rules.

Other accounts with more flexible timing:

• Traditional IRAs for 2025 can usually be funded up to your tax filing deadline in 2026.
• Roth IRAs (direct contributions or the first step of a backdoor Roth) follow that same timing.
• HSAs can also be funded up to your filing deadline, and if you invest your HSA, earlier is usually better for growth.
• SEP IRAs also give you extra time. Even though many planners prefer solo 401(k)s over SEP IRAs, SEPs still show up often for business owners.

Those accounts are not as panicky in December, but it is still smart to know which ones are year-end only and which can be handled in early 2026.

529 Plans, ABLE Accounts, and UTMA/UGMA

If you are saving for kids or supporting a loved one with disabilities, you probably have some state-level rules to respect.

Most states give you a state tax benefit for contributions to a 529 plan, and for many states, that benefit follows a December 31 deadline. Some states let you contribute up to the tax filing deadline and treat it as last year’s contribution, but that is not the norm. If you want your 2025 state benefit, you should treat 529 contributions as a year-end move.

A few more:

• ABLE accounts also follow a year-end contribution limit pattern.
• UTMA/UGMA accounts do not have a formal IRS cutoff, but if you are trying to stay within the annual gifting limits for 2025, then you are effectively working with a December 31 deadline too.

If you are following annual gift limits or trying to hit a certain savings goal per year, money has to show up in those accounts in that actual calendar year.

Do Not Let FSA Dollars or CME Funds Expire

You do not want to be the person panic-buying random stuff with pre-tax dollars because you forgot to check your benefits.

Flexible Spending Accounts (FSAs)

FSAs are famous for the phrase “use it or lose it.”

Many FSAs still work that way. You contribute pre-tax dollars for the year, then if you do not spend them, they vanish. Some employers have added two features that soften the blow:

• A 2½-month grace period into the next year, where you can still spend leftover funds.
• A limited carryover amount, which is about $600 for 2025.

The important catch is this: neither of those features is required. Your employer may offer one, both, or neither. Some will also say that even carried-over money must be used by the end of that next year.

So you need to check:

• Your open enrollment packet.
• Your HR or benefits portal.
• Any end-of-year FSA emails your employer sends.

If you have money that truly expires on December 31, do not let it vanish. You want to avoid the classic move of buying what feels like 6,000 tubes of sunscreen just to avoid wasting your FSA.

Physician CME Funds

If you are a physician on salary with CME money, this is your version of “use it or lose it.”

Most CME funds are calendar-year benefits. If you do not use them by December 31, they do not roll over. That is free education and professional development money, gone.

You can use CME funds for conferences, courses, subscriptions, and more, depending on your employer’s rules. If you are in medicine, put this on your December list: check your remaining CME balance and spend it intentionally.

Give Money the Smart Way: Gifts and Charitable Strategies

You might be helping kids, parents, or charities at year-end. The tax code has opinions on all of that.

Annual Gift Tax Exclusion

For 2025, the annual gift tax exclusion is $19,000 per person.

That means you can give up to $19,000 to as many individuals as you want during the year without touching your lifetime exemption. If you are married, you and your spouse can each give $19,000 to the same person, for a combined $38,000.

If you give more than those amounts, it does not mean you or the recipient suddenly owes gift tax. It usually just means you start eating into your lifetime exemption, which is currently just shy of $14 million per person.

So if you want your 2025 gifts to fit neatly under the annual exclusion, those checks or transfers need to happen by December 31.

Donor-Advised Funds

A donor-advised fund (often called a DAF, and yes, you will also hear people say “daff”) is like a charitable investment account. You put money in, get the deduction in the year of the contribution, and then recommend grants to charities over time.

Key details from a year-end angle:

• Contributions to a donor-advised fund are a December 31 item if you want them to count for 2025.
• The DAF is not limited to $19,000 like the annual gift exclusion. The main limit you usually watch is a percentage of adjusted gross income (AGI), and 60 percent is a common ceiling for cash gifts.
• If you are itemizing deductions, DAF contributions can have a dollar-for-dollar effect on your taxable income, up to the AGI limit.

For high-income households who want to “bunch” several years of giving into one tax year to maximize deductions, a DAF often becomes the go-to tool.

Standard Deduction vs Itemizing in 2025

For 2025, the standard deduction is:

• $31,500 if you are married filing jointly.
• $15,750 if you are single.

If your total itemizable deductions (things like mortgage interest, certain taxes, and charitable gifts) do not exceed those numbers, you are probably taking the standard deduction. In that case, regular charitable donations may not move your tax bill at all.

That is where strategies like QCDs or bunching multiple years of donations into a DAF can be much more effective. When you itemize, every dollar of deductible giving has that dollar-for-dollar impact on your taxable income, which is exactly what you want.

Quick but Important: Beneficiaries and Quarterly Taxes

These are not flashy, but they can save you a ton of trouble and money.

Review Your Beneficiaries Every Year

Beneficiary designations are easy to forget and very powerful.

Any account with a named beneficiary usually skips probate and goes straight to the person you listed. That sounds great until you realize you still have your ex-spouse or a long-lost cousin listed from 15 years ago.

At least once a year, you should review beneficiaries on:

• IRAs and 401(k)s.
• Life insurance policies.
• Transfer-on-death or payable-on-death accounts.

Many people like to track this in a simple spreadsheet, listing the account, the beneficiary, the percentage, and an approximate dollar amount. It makes it easier to see whether your money is aligned with your actual wishes.

If life changes, your beneficiaries should change with it. You do not want a court or an old form deciding where your wealth goes.

Quarterly Estimated Payments for 1099 Income

If you earn 1099 income and no one is withholding taxes for you, you are expected to pay quarterly estimates. Skipping them and paying just once in April sounds tempting but usually brings penalties and interest.

For the 2025 tax year, your last chance to make a quarterly payment is January 15, 2026. That payment can soften the blow if you are behind, but it does not magically fix missed payments from earlier quarters.

The IRS treats underpayments by quarter. So if you skip Q1, Q2, and Q3, then dump a big payment into Q4, you still get penalized for the earlier shortfalls.

If you:

• Have a growing 1099 side gig.
• Switched from W-2 to 1099 mid-year.
• Keep getting surprised by big April tax bills.

Then you should talk with a CPA or a financial planner about setting up and smoothing out your quarterly estimates.

Look Ahead: Frontload 2026 for Extra Growth

Once you hit the 2025 deadlines, you can give yourself a small pat on the back, then look ahead.

A powerful habit for high-income earners is to frontload key accounts early in the new year. That simply means you fund them earlier instead of waiting until the last minute.

Why that matters:

• More time in the market usually means more time for compounding.
• You get your tax benefits locked in earlier.
• You avoid the “I ran out of time” crunch at the end of the year.

Accounts that are great candidates for early-year funding:

• Backdoor Roth IRAs. Some advisory firms even have a “Backdoor Roth IRA Day” where they help every client get it done right away.
• 529 plans for kids or grandkids.
• UTMA/UGMA accounts for minor children.
• HSAs, especially if you are investing the balance rather than just using it for current expenses.
• Workplace plans like 401(k)s, 403(b)s, and 457(b)s.

One last note on workplace plans and frontloading: check whether your employer offers a true-up match. Some plans only match contributions when you are contributing each pay period. If you max out your 401(k) in January and your plan does not have a true-up, you may accidentally give up some match later in the year.

A true-up match fixes that. It lets your employer “catch up” your match at the end of the year based on your total contributions. Ask HR if your plan has a true-up before you frontload.

Wrap Up: Turn December Into a Tax Win

You do not have to love taxes to play the game well. You just need to know which levers matter in December and which ones you can safely handle in early 2026.

Your main year-end checklist for 2025 includes Tax Loss Harvesting, RMDs and QCDs, Roth moves, employee retirement contributions, FSAs, gifting, and estimated payments. Add in beneficiary reviews and, if you are a physician, CME funds, and you are covering the big pressure points.

Take a few minutes now, pick the items that apply to you, and knock them out before the year is over. Your future self, staring at a smaller tax bill and a larger pool of tax-advantaged dollars, will be very happy with the work you did this month.