Year-end tax moves for investors

Year-end tax planning is not a December shopping spree for deductions. It is inventory control.

What did you buy, sell, contribute, distribute, borrow, repay, place in service, or carry across state lines? Which number is final? Which one is an estimate? Which decision still fits through this year’s door?

The bad version asks, “What can I buy before December 31?” The useful version asks, “What happened, what can I prove, and which choices become irreversible when the calendar changes?”

This is federal tax education, not a recommendation to sell, exchange, accelerate, defer, elect, or pay anything. A CPA or tax attorney needs your full return, entity documents, state footprint, holding periods, and transaction records before advising you.

Count the investments before chasing a move

Create one row per investment. Record cash contributed, cash distributed, refinances, debt changes, sales, exchanges, state activity, and the latest tax estimate. Then link or attach the evidence for every cell. A control sheet without source documents is just a neat shelf of empty cartons.

For a partnership investment, do not stop at page one of the K-1. Review:

• boxes 1 through 3 for business and rental income or loss;
• box 10 and its statement for section 1231 items;
• box 19 and supporting codes for distributions;
• item K for changes in your share of liabilities;
• item L for tax-basis capital movement;
• box 20 statements for separately reported items and disclosures; and
• state K-1s, withholding, composite-return elections, and filing exposure.

Ask for an estimated K-1 when the final will arrive after the planning decision. Label it estimate. A projection helps your CPA model a range and reserve cash. It is not permission to file, and it does not prove the final allocation will fit inside the same number.

Basis is the container nobody can find

Suppose you started with a $100,000 cash investment and a $60,000 share of partnership liabilities. During the year, the K-1 estimate shows $12,000 of income, $18,000 of cash distributions, and a debt allocation that fell from $60,000 to $35,000.

A rough bridge begins at $160,000, adds $12,000, subtracts the $18,000 distribution, and subtracts the $25,000 liability decrease. That lands at $129,000 before other adjustments.

It is an illustration, not the answer. Contributions, nondeductible items, section 754 adjustments, suspended losses, property distributions, and partner-specific facts can move it.

The ending capital account in item L is not automatically outside basis. If the CPA does not have a basis rollforward, ask who maintains it. “The K-1 software tracks it” is not a basis schedule. Software can store a number beautifully while remaining completely innocent of where it came from.

One sale can unpack several kinds of gain

An investor sells a rental interest and says, “I made $140,000, so it is long-term capital gain.” Maybe some of it is. Business real estate can produce section 1231 gain, ordinary income from depreciation recapture, unrecaptured section 1250 gain, and other separately reported items. Prior section 1231 losses can also recharacterize current gain.

Before closing, give the CPA the purchase documents, depreciation schedules, cost-segregation report, capital-improvement ledger, refinance history, selling-cost estimate, and proposed closing statement. Ask for a character-by-character estimate, not one blended tax rate.

Cash is not taxable gain, and taxable gain is not cash. Debt relief can affect amount realized. Suspended passive losses may help, but only after the disposition rules are actually met. One sale enters the tax file. Several different tax characters may climb out.

Reserve against the modeled tax, not the number left in the operating account.

The 1031 clock does not accept store credit

For a deferred section 1031 exchange, replacement property generally must be identified in writing within 45 days after the relinquished property transfers. Receipt is generally due by the earlier of 180 days after transfer or the due date, including extensions, of the return for the transfer year.

Sell on December 1, and the 45th day is generally January 15. The 180th day is generally May 30, but an unextended April return due date can arrive first. Put the extension question on the calendar before the sale. An email sent on day 179 is not a time machine.

Use a qualified intermediary and transaction counsel; do not improvise custody of proceeds. The exchange rules care where the money went and when the documents were delivered, not how sincerely everyone intended to finish.

Placed-in-service timing has the same talent for exposing loose language. Paying for equipment or finishing a study does not necessarily establish when property was ready and available for its assigned use. If depreciation timing matters, document the actual placed-in-service facts and ask the CPA which law applies to that asset for that year.

Estimated tax has its own due dates

A large fourth-quarter gain can create an estimated-tax problem before the return is filed. For 2026 federal purposes, the general required annual payment is usually the smaller of 90% of expected current-year tax or 100% of prior-year tax, with 110% replacing 100% for certain higher-income taxpayers.

Example: prior-year total tax was $40,000 and prior-year AGI exceeded $150,000. The prior-year safe-harbor leg may be $44,000. That does not mean $44,000 is the final tax bill, and it does not settle state obligations.

If income arrived unevenly, ask whether the annualized-income method changes installment calculations. Do not wait for the April extension. An extension gives the return more time to arrive; it does not give the payment another compartment to hide in.

Have the CPA model the liability and payment schedule using the full federal and state picture. The operating account balance is not a tax estimate just because it is the only number currently available.

The year-end CPA agenda

Send the control sheet and source documents with these questions:

1. What is my projected federal and state taxable income by character?
2. What are my outside basis, at-risk amount, and suspended-loss balances by activity?
3. Which K-1 estimates are missing, and what range should we model instead of inventing one number?
4. Do any planned sales trigger section 1231, depreciation recapture, installment-sale, or passive-loss issues?
5. Are any 1031 identification, receipt, return-extension, election, or state deadlines already running?
6. What must be placed in service, paid, elected, or documented before year-end for the intended treatment?
7. Have withholding and estimated payments satisfied the applicable safe harbor, and is annualization worth computing?
8. How much cash should remain untouched for federal, state, and local tax?

That is year-end planning: label the facts, isolate the estimates, calendar the decisions, and keep tax cash out of the spending pile. No treasure hunt required. The treasure was competent records, which explains why nobody made a dramatic thumbnail about it.

Close one control sheet

Start with the investment most likely to create a gain, a large loss, a multistate filing, or a deadline. Reconcile its cash, debt, basis, tax character, source documents, and expected forms on one page. Send it to your CPA with the earliest decision date at the top.

Do that before shopping for a move. A labeled inventory creates options. A bag of December receipts creates billable hours.

Primary sources

• IRS Partner’s Instructions for Schedule K-1 (Form 1065)
• IRS Publication 541, Partnerships
• IRS Publication 544, Sales and Other Dispositions of Assets
• IRS Instructions for Form 8824, Like-Kind Exchanges
• IRS Publication 505 (2026), Tax Withholding and Estimated Tax
• IRS Publication 946, How To Depreciate Property