Key takeaways
- Year-end moves fall into two buckets: hard December 31 deadlines and decisions still open at filing time.
- You cannot plan on a guess. Bring the books current before deciding anything.
- Equipment has to be placed in service, not merely paid for, to count for the year.
- Some retirement plans must exist before year end even when the money can go in later.
- Buying something you do not need to avoid tax leaves you poorer, not smarter.
Most year-end tax advice arrives as a shopping list. Buy a truck, buy equipment, prepay something. That is the least useful version of the conversation, and it is why owners spend real money in December for a fraction of it back in April.
The useful version starts with a sorting question: which decisions expire on December 31, and which are still on the table in March?
Start with the numbers you actually have
Nothing here can be decided responsibly without current books. If your last reconciled month is July, you are not planning, you are speculating with a deadline attached.
Get to a defensible picture first: accounts reconciled through the most recent closed month, expenses categorized with owner draws separated out, receivables reviewed for anything uncollectible, and payroll and estimated payments totaled.
Then project through December and compare that against what you have already paid in. The gap is the number every decision below is measured against.
If the books are behind, fixing them is the year-end move. A cleanup started in early December is achievable. One started on December 28 is not.
The deadline map
Here is the split in its simplest form. Work the left column first and leave the right until January.
| Must happen before December 31 | Can wait until you file |
|---|---|
| Placing equipment and fixed assets in service | Choosing the expensing or depreciation election |
| Running the final payroll, with owner wages and taxable fringe benefits | Preparing and filing the return |
| Establishing certain retirement plans and withholding employee-side deferrals | Funding employer contributions where the plan allows |
| Completing charitable gifts, check mailed, card charged, securities transferred | Making a personal IRA contribution |
| Timing when income is invoiced and expenses paid | Most accounting method elections |
| State pass-through entity tax elections and payments | Allocating and carrying losses forward |
State rules vary, and a few items shift columns depending on your entity. Treat this as a map, not a statute.
The timing levers: income and expenses
The oldest year-end tool is moving income and deductions across the calendar line. It works best for cash-basis businesses, where the trigger is when money changes hands rather than when the work was done.
Accelerate deductions and defer income when this year is your higher-income year. Delay December invoices until early January, pay January vendor bills in late December, or fund a bonus pool before the final payroll. Deferring income is not deferring the work, deliver the project, then choose when to invoice.
Do the opposite when next year brings a large contract, a business sale, or an S‑Corp election that changes your compensation picture. Deductions are worth more against income taxed at a higher rate.
The rule that saves the most money
A deduction returns only a portion of what you spend. Buying something you would not otherwise buy converts a dollar of cash into a fraction of a dollar of savings. The only purchases worth accelerating are ones you had already decided to make.
Equipment, vehicles, and placed in service
This is where December spending most often fails to produce the expected result, and the reason is one concept: placed in service.
An asset counts for the year in which it is ready and available for its intended use, not the year you ordered it or paid for it. Machinery in a crate on December 30 waiting on an installer is not placed in service. A vehicle bought on December 28 and driven for business that week is.
So confirm the installation date, not the invoice date. Financing does not change the answer: an asset bought on credit and placed in service before year end generally still counts.
The election determining how much of the cost comes off this year is made on the return, so that part can wait. Vehicles carry their own limits based on weight and business use.
Retirement plans: establish now, fund later
This is the most valuable distinction on the list, and the one owners learn about a month too late. Plans separate into two questions: when the plan has to exist, and when the money has to go in. Those deadlines differ by plan type.
- Solo 401(k) plans generally need to be adopted before year end for employee-side deferrals, since deferrals come out of compensation earned during the year. The employer-side contribution typically follows a later deadline.
- SEP‑IRAs can generally be established and funded up to the due date of the return including extensions, the rescue plan for owners who did nothing in December.
- SIMPLE IRA plans must be set up earlier in the year, so they are a next-year decision by the fourth quarter.
- Defined benefit and cash balance plans suit owners with high, stable profit who want to shelter more, and they require actuarial setup.
Limits change annually, so treat this as structural: pick the vehicle before year end, decide the amount later.
The most expensive words in year-end planning are “I did not know I had to open it first.” Establishing a plan costs almost nothing and preserves every option. Ali Kafoo, CPA
Owner compensation, distributions, and elections
If you operate as an S‑corporation, the final payroll of the year is a hard stop. Reasonable compensation has to run through payroll with taxes withheld and deposited, it cannot be booked as a journal entry in March. Health insurance premiums for a more-than-2% shareholder belong there too.
Review distributions against basis while you can still act, since distributions in excess of basis create a taxable event. If the election itself is still an open question, our article on what the S‑Corp election actually saves covers the math.
Election deadlines cluster here too. An S‑Corp election for next year can generally be filed during the current year or the early weeks of the new one, and entity formations have state-dependent effective dates. Also reimburse yourself: under an accountable plan, submit the mileage, home office, and out-of-pocket costs you have carried personally.
Payroll, contractors, and information returns
January arrives with a compressed filing window. Every problem you head off now is one you do not troubleshoot then:
- Collect missing W‑9 forms. Any contractor you paid this year who has not given you one is a January problem.
- Verify legal names and taxpayer identification numbers. A mismatch on a 1099‑NEC produces a notice and, eventually, backup withholding obligations. Check the W‑9 against your accounting system, not memory.
- Review worker classification. Someone who works set hours, uses your equipment, and takes direction like an employee is a reclassification risk. Our compliance services cover this review.
- Capture taxable fringe benefits. Personal use of a company vehicle and similar items belong on the W‑2, and the final payroll is your last chance to include them.
Benefits, giving, and state exposure
Benefits and reimbursement plans
Confirm your accountable plan is documented in writing, that health reimbursement or cafeteria plan elections are current, and that flexible spending balances are used according to plan terms. Plan documents that exist only in conversation do not survive review.
Charitable giving mechanics
A gift is generally complete when the check is mailed, the card is charged, or the securities transfer settles, and a securities transfer takes longer than people expect.
Where the deduction lands depends on your entity. For most pass-through businesses, contributions flow to the owners’ personal returns rather than reducing business profit, which changes whether the gift helps you at all this year. Donating appreciated securities held long term, or bunching several years of giving into a donor-advised fund, are worth asking about.
State and multi-state items
Many states now offer a pass-through entity tax election requiring an election, a payment, or both before year end. Missing that window forfeits the benefit entirely.
Review where your people and customers are. A remote employee in another state, sales into a new state, or out-of-state property can each create filing obligations you do not currently have. Washington owners have their own set: no personal income tax, but business and occupation tax, city-level taxes, and sales tax sourcing. Our tax optimization work starts with this exposure review.
Records to gather, and what genuinely waits
Pull these together while the year is still fresh:
- Year-end bank, credit card, and loan statements, plus amortization schedules
- A fixed asset list with purchase dates, costs, and in-service dates, including disposals
- Year-end inventory count, if you carry inventory
- Mileage logs and a home office square-footage figure
- Payroll reports, contractor payment totals, and completed W‑9 forms
- Documentation for any unusual transaction: an asset sale, settlement, new loan, or ownership change
- Records of estimated tax payments made federally and to each state
And here is the list that should lower your blood pressure. These do not require December action: choosing depreciation and expensing elections, funding a SEP‑IRA or the employer side of an existing plan, making a personal IRA contribution, most accounting method elections, and preparing the return.
A note on the numbers in this article
Contribution limits, expensing caps, mileage rates, and state rules change every year, and several deadlines above depend on your entity type and plan documents. This article describes how the mechanisms work rather than current-year figures. Confirm the specifics before acting.
The point of a year-end checklist is not to spend money. It is to know what you will owe and to make the handful of decisions that genuinely close on December 31. If you want a second set of eyes before then, schedule a consultation. Related reading: the deductions owners miss most and tax planning vs. tax preparation.
Frequently asked questions
It depends on the move. Anything that turns on timing closes on December 31, placing an asset in service, running payroll, completing a charitable gift, making a state pass-through entity election. But several options stay open into the following year, including funding a SEP‑IRA, making a personal IRA contribution, and choosing depreciation and expensing elections on the return.
Only if you already needed the equipment. A deduction returns a portion of what you spend, never all of it, so a purchase made purely for tax reasons leaves you with less cash than you started with. If it was already planned, timing it before year end can make sense, but the asset has to be placed in service, meaning ready and available for its intended use.
Year-end bank, credit card, and loan statements; a fixed asset list with purchase dates, costs, in-service dates, and disposals; an inventory count if you carry inventory; mileage logs and home office measurements; payroll reports and contractor totals with completed W‑9 forms on file; and a record of estimated tax payments made federally and to each state.
