Before December 31: Rank Tax Decisions by What You Cannot Undo

Fusion Legal & Tax · October 19, 2026Practice Area9 min readTax Planning & Advisory

Year-end tax planning can feel like a rush of competing instructions: sell, contribute, defer, accelerate, elect, amend. But the most useful question is often simpler:

Which decisions become difficult—or impossible—to reverse once the year closes?

That question changes tax planning from a search for isolated deductions into a process for understanding your full financial picture and making smarter choices. It also helps you spend your limited planning time where it matters most.

This is especially important when new legislation does not operate on one tidy timeline. As of October 2026, a detailed summary of recent federal tax-law changes states that “the majority of the tax provisions will go in effect in tax year 2025,” some begin in tax year 2026, and “a few uncommon provisions are retroactive to tax year 2024.” Meanwhile, the IRS says the Working Families Tax Cuts significantly affect federal taxes, credits, and deductions, including provisions involving individuals, families, health care, businesses, clean energy, and charitable giving.

The protective response is not to act on every new headline. It is to build a decision list, rank each item by reversibility, and confirm the rule that applies to your facts before money or property moves.

Start with three planning buckets

Every item on your year-end list can be placed into one of three practical buckets.

This classification matters because paperwork can sometimes be reconstructed. A projection can often be updated. A completed sale, distribution, payroll payment, or transfer usually cannot be treated as though it never occurred simply because the tax result was different from what you expected.

Bucket 1: Review transactions that may become irreversible

These decisions deserve attention first. The objective is not necessarily to complete a transaction before December 31. It is to decide intentionally whether the transaction should happen at all, when it should happen, and what information is still missing.

Asset sales and investment changes

Before selling an investment, business interest, real estate holding, or other appreciated asset, gather:

• the anticipated sale price and transaction costs;
• the original purchase documents;
• records of later improvements, contributions, or adjustments;
• prior tax returns reporting the asset;
• information about other gains or losses during the year; and
• the expected closing and payment dates.

A statement showing the asset’s current value is not necessarily a complete tax-basis file. If basis records are incomplete, identify that problem before the transaction rather than discovering it while preparing the return.

A tax projection should also sit alongside—not replace—the underlying business or family decision. Selling an asset solely because someone described the transaction as “tax efficient” may ignore liquidity needs, investment concentration, contract terms, financing obligations, or the reason you owned the asset in the first place.

Compensation and owner payments

Business owners should review how money moved between the company and its owners during the year. Create a ledger separating:

• payroll;
• owner draws or distributions;
• reimbursements;
• loans to or from owners;
• personal expenses paid by the business; and
• business expenses paid personally.

Those labels should reflect what actually happened. Year-end planning should not begin by choosing the most appealing tax label and working backward. It should begin with bank records, payroll reports, agreements, and the legal structure of the business.

If the company is considering a bonus or other year-end payment, ask practical questions before processing it: Who is receiving it? When will it be approved? When will it be paid? How will payroll reporting handle it? Does the business have enough cash for the payment and related obligations?

Charitable transfers

A charitable plan should start with the cause you want to support, then address the form and timing of the contribution. The federal rules affecting charitable giving continue to change: the IRS’s Working Families Tax Cuts guidance identifies provisions for tax-exempt entities and charitable giving, including a permanent deduction for certain charitable cash contributions by individuals who do not itemize and a federal scholarship tax credit.

Before transferring cash, securities, business interests, or other property, confirm:

1. the recipient organization;
2. the asset being transferred;
3. who legally owns that asset;
4. whether the recipient can accept it;
5. the transfer and valuation documentation that may be needed; and
6. whether completing the transfer this year supports the family’s broader financial plan.

Do not let the paperwork lag behind a complex gift. A promised gift, an initiated transfer, and a completed transfer may not be the same event.

Retirement-account and benefit decisions

For a contemplated retirement contribution, distribution, rollover, conversion, or benefit election, collect the relevant account statements and plan materials before acting. Then model more than the current year.

A choice that changes this year’s taxable income may also affect future account balances, cash reserves, income-based limitations, or the taxes associated with later withdrawals. A good projection therefore compares scenarios rather than presenting one isolated tax number as the answer.

Bucket 2: Recalculate amounts that can still be adjusted

Once the transaction list is under control, turn to calculations. These decisions may be more adjustable, but delay can still create avoidable pressure.

Build at least two projections

A single projection can create false confidence. Consider preparing:

• a base case using the best information currently available; and
• a change case reflecting a plausible bonus, sale, distribution, business result, or other unresolved event.

For households or businesses with greater variability, add a third case showing a reasonable high-income or low-income outcome.

Each projection should state its assumptions. For example:

• year-to-date wages and withholding are current through a particular pay period;
• business income remains subject to final bookkeeping adjustments;
• a proposed sale is included or excluded;
• a contribution has not yet been completed; or
• a new deduction is being evaluated but has not been assumed.

This keeps an estimate from being mistaken for a promise.

Reconcile withholding and estimated payments

Gather year-to-date pay statements, federal and state estimated-payment confirmations, and any records of payments applied from an earlier return. Compare those amounts with the projections.

The planning question is not merely, “Am I getting a refund?” It is whether current payments reasonably align with the projected liability, available cash, and applicable payment rules.

If a spouse changed jobs, the family added self-employment income, a business became more profitable, or investment income increased, last year’s payment pattern may no longer fit this year’s facts.

Separate federal and Colorado analysis

Colorado clients should not assume that a federal tax result automatically produces the same state result. Maintain separate federal and Colorado columns in the planning worksheet for:

• projected income;
• additions or subtractions under consideration;
• credits being evaluated;
• withholding and estimated payments; and
• unresolved questions requiring state-specific review.

For clients operating in multiple states, add a residency and business-activity map. Do not treat a multi-state question as a percentage allocation exercise until the legal and factual basis for allocation has been examined.

Bucket 3: Protect the documentation file

Documentation is the least exciting part of tax planning—and often the part that determines whether a position can be explained later.

Your year-end file might include:

• final pay statements and payroll summaries;
• bank and credit-card statements;
• brokerage realized-gain reports;
• purchase and closing documents;
• invoices and proof of payment;
• charitable acknowledgments;
• loan agreements and interest statements;
• retirement-account confirmations;
• health-benefit records;
• vehicle or mileage records;
• business formation and ownership documents; and
• correspondence about any pending tax issue.

Do not rely on forms remaining unchanged after their initial release. The IRS explains that its post-release change notices address changes to forms, instructions, and publications after they become available. According to the IRS, those changes are often caused by “new tax legislation, new IRS guidance, clarifications, corrections, updates of mailing addresses or phone numbers, and other revisions.”

That is a useful reminder: a year-end plan should record not only the rule being used, but also the source and version consulted.

Use a decision register—not a pile of notes

A short decision register can keep the process organized:

For every open item, write down the next physical action: request the basis report, obtain the payroll projection, confirm the recipient can accept the asset, reconcile estimated payments, or schedule a review.

“Discuss taxes” is not an action item. “Send the year-to-date payroll register by Friday” is.

Apply a source hierarchy to new tax rules

When a planning idea depends on recently enacted law, separate three layers:

1. The enacted provision: What became law, and for which tax year?
2. Agency guidance: What has Treasury or the IRS explained, limited, or left unresolved?
3. Implementation materials: Have forms, instructions, payroll systems, and reporting procedures caught up?

The layers may move on different schedules. The IRS overview of Working Families Tax Cuts organizes the changes across individuals, families, health care, businesses, clean energy, investment, and charitable giving. A separate tax-law timeline summary notes that provisions begin in different tax years. And the IRS maintains a dedicated page for changes made after forms and instructions are released.

Together, those sources support a disciplined approach: identify the provision, verify its effective period, check later guidance, and confirm how the relevant form or reporting process implements it.

Questions to bring to a year-end tax-planning meeting

A useful planning conversation may include:

• Which proposed transactions cannot easily be reversed after closing?
• Which assumptions have the greatest effect on the projection?
• What information is still estimated rather than confirmed?
• Which new provisions might apply, and which eligibility conditions remain unresolved?
• Does a tax-year deadline differ from a filing deadline or payment deadline?
• Have federal and Colorado consequences been reviewed separately?
• Will the transaction affect more than one year?
• What records should be created or preserved now?
• Who is responsible for each remaining action?
• When should the projection be refreshed?

The goal is a defensible decision, not a perfect prediction

Tax planning takes place before every number is final. That makes assumptions unavoidable—but undocumented assumptions are not.

A strong year-end process helps you identify the decisions that may soon become irreversible, compare reasonable scenarios, preserve the supporting file, and assign each next step to a real person. It cannot guarantee a particular tax result, and it should never force a financial decision solely to create a deduction.

Fusion Legal & Tax helps Colorado families and businesses evaluate year-end planning questions, while also handling federal tax and general business matters for clients nationwide. The right review depends on your income, transactions, entity structure, family circumstances, and the guidance in effect when you act.

This article provides general educational information, not legal or tax advice for any particular person or transaction.