Tax preparation reports what already happened; tax planning changes what happens next. Preparation files the return after year-end using final numbers. Planning happens during the year, when decisions about entity structure, owner compensation, retirement contributions, equipment timing and estimated payments can still change taxable income. Most planning levers close on December 31.
This article explains the difference between the two services, the decisions that generally have to be made before year-end, the few that can still be made afterward, and what a planning engagement should deliver. It is written for small business owners and reflects federal and California rules for the 2026 tax year. With the year-end less than two months away, the timing matters now.
Tax preparation is backward-looking and compliance-focused: it accurately reports completed transactions on the required federal and state returns. Tax planning is forward-looking: it uses projected numbers to evaluate decisions before they become final.
Think of it as reading the map after the trip versus choosing the route before you leave. Both are valuable, and preparers do careful, skilled work. They simply answer different questions: “What happened, and is it reported correctly?” versus “What should we do next, and what will it mean for taxes?”
By the time a return is prepared, most of the decisions that affect taxable income have already been made. That is why the timing of a conversation with your CPA matters as much as the work itself.
Factor | Tax planning | Tax preparation |
|---|---|---|
Timing | During the year, and before major transactions | After year-end |
Inputs | Year-to-date books and projections | Final books and tax documents (W-2s, 1099s, K-1s) |
Decisions | Evaluates choices that can still change | Reports choices already made, with limited remaining elections |
Deliverable | Projection, action list and estimated payment schedule | Filed federal and state returns |
Deadline | Most actions must be completed by December 31 | Follows filing deadlines |
Want to review your options before December 31? Book a tax strategy call.
The items below are the main planning levers. Each is explained in general terms. Whether any of them fits your business depends on the facts, and none is a recommendation.
How your business is structured affects how its income is taxed. An S corporation election is one example: an eligible company can elect to be taxed under S corporation rules by filing Form 2553. According to the IRS Form 2553 instructions, the election must be made no more than 2 months and 15 days after the beginning of the tax year it takes effect, or at any time during the preceding tax year. For a calendar-year company, an election intended for 2027 can therefore be filed during 2026 or by March 15, 2027.
Late-election relief exists in some cases, but it generally requires reasonable cause and prompt corrective action. Eligibility rules also apply, including limits on the number and type of shareholders and a single class of stock. This is not a recommendation to elect. For a deeper look at an S corporation comparison, see [EDITOR: link S corp sibling blog].
If you own an S corporation and work in the business, how you split pay between salary and distributions affects payroll taxes. The IRS states that an S corporation must pay a shareholder-employee reasonable compensation for services before non-wage distributions, and that it can reclassify payments as wages. The IRS lists factors such as duties, time devoted, training and experience, and pay at comparable businesses.
Payroll has to actually be run during the year. Compensation cannot be fixed retroactively after year-end. There is no single percentage or rule of thumb, and an advisor should look at your specific facts.
Contributions to a business retirement plan can reduce taxable income, and the deadlines vary by plan type. Do not assume that everything must happen by December 31, or that nothing can.
Confirm your plan’s deadlines against the IRS retirement plans for self-employed people page and Publication 560 before relying on any date. Annual contribution limits change each year, so check the current figures.
When equipment is purchased and placed in service can affect depreciation and expense deductions. Federal rules changed in 2025. According to IRS Publication 946, the 100% special depreciation allowance was reinstated for qualified property acquired and placed in service after January 19, 2025. The Section 179 expensing limit for 2026 is listed there as $2,560,000, reduced once qualifying property placed in service exceeds $4,090,000.
California does not follow the federal bonus depreciation rules. The FTB’s most recent instructions (tax year 2025) list a much lower California Section 179 limit of $25,000, reduced once property placed in service exceeds $200,000. Confirm the 2026 California figures before planning a purchase.
A purchase should make business sense first. Buying equipment solely for a deduction can leave you with a real cash cost and an asset you do not need.
Depending on your accounting method, the timing of certain income and expenses near year-end may affect which tax year they fall into. The rules differ for cash-basis and accrual-basis businesses, and some items are restricted. This is a conversation for your advisor, not a general rule.
Estimated payments generally do not reduce what you owe. They help you avoid underpayment penalties and large surprise balances. Federal and California schedules are different.
For federal estimated tax, the IRS lists individual due dates of April 15, June 15, September 15 and January 15 of the following year. The safe harbor generally means paying the smaller of 90% of the current year’s tax or 100% of the prior year’s tax, or 110% if prior-year adjusted gross income exceeded $150,000 ($75,000 if married filing separately).
California’s installments for individuals are not equal. The FTB’s 2026 Form 540-ES instructions list 30% on April 15, 40% on June 15, 0% on September 15 and 30% on January 15, 2027. Higher-income taxpayers face different safe harbor rules, including a requirement to base payments on current-year tax when California AGI is $1,000,000 or more. Corporations and other entities follow separate rules, so confirm yours.
California has its own rules and does not conform to many federal provisions, as the depreciation example shows. One state-level planning item is the pass-through entity (PTE) elective tax. According to the FTB, it is available for taxable years beginning on or after January 1, 2021 and before January 1, 2031, to entities taxed as partnerships or S corporations. The election is made on a timely filed original return, and payments are due on June 15 of the election year and by the original return due date. For 2026, the June 15 date has passed, and the FTB describes consequences for a missed or short payment, so talk with an advisor early if you are considering it. Our California PTE tax guide covers the decision in more detail. You can also review the FTB’s estimated payment rules.
A few items can still be completed after year-end. A SEP-IRA can be set up and funded up to the return due date, including extensions. Some other retirement contributions have their own post-year-end deadlines (see IRS Publication 590-A for IRAs). An S corporation election can be filed within 2 months and 15 days of the start of the year it takes effect, and a PTE election is made on the timely filed return. These are the exceptions, not the rule, and each has conditions.
Not sure which of these apply to your business? Book a tax strategy call.
A well-scoped tax planning engagement typically produces three things.
An estimate of the year’s tax based on year-to-date results and expected activity.
Specific decisions to consider, each with a deadline and a responsible person.
Federal and California payment amounts and dates.
It should also make clear what information you must provide, how often the projection is updated, who implements each action (the owner, the payroll provider, a financial advisor), and what is not included, such as tax preparation, bookkeeping, legal work or investment advice.
Planning also depends on accurate, reconciled books. A projection built on unreconciled numbers is only as good as those numbers. See our guide to monthly bookkeeping services and what a complete month includes.
Planning at filing time can only describe the year that just ended. Working through the year changes what is possible:
One example of a rhythm: a spring review after filing, a mid-year projection, and a fourth-quarter planning meeting. It is an example, not a required schedule.
Many CPAs offer both, but planning is often a separate service with its own scope and fee. Not every preparer offers planning. If you are choosing a professional, see how to choose a small business CPA in Los Angeles. Ask these questions:
NexusWorks is led by California-licensed CPAs and may be an option for businesses whose needs fit its services. Its tax planning and strategy page describes services that include quarterly tax projections, year-end planning, estimated tax payment setup, S corporation owner pay modeling, California PTE tax planning, entity comparisons and multi-entity structuring. It describes starting with a review of recent returns and current books, reconciling books monthly so projections use current figures, updating the projected liability each quarter, and modeling the impact of major decisions before they happen.
A clearly scoped planning engagement generally follows these steps:
Exact scope and deliverables are confirmed up front, and no outcome or saving can be promised. Related services include business tax filing and compliance, bookkeeping and financial management and financial advisory and optimization.
These questions help you gather what a CPA needs to start planning. It is a starting point, not a plan, and not every question applies to every business.
Preparation tells you what the year looked like. Planning gives you a say in how it ends. If you have decisions that could change this year’s taxes, such as owner pay, equipment, retirement contributions or an entity question, review them before December 31 with a qualified advisor.
Want to review your options before December 31? Book a tax strategy call.
You can also contact NexusWorks to discuss your business’s financial needs.
Tax preparation reports what already happened by filing federal and state returns after year-end. Tax planning looks ahead, using projections to evaluate decisions before they become final. Both matter, but they answer different questions and usually happen at different times.
Tax planning services typically include a tax projection based on year-to-date results, an action list of decisions with deadlines, and an estimated tax payment schedule. Scope varies by engagement, so confirm what is included and what is not, such as preparation or bookkeeping.
Early in the year is best, with a mid-year projection and a fourth-quarter review. Planning works better with reconciled books and time to act. A business that has not started can still begin now, though fewer options remain as year-end approaches.
Not necessarily, but options narrow. Some actions, such as payroll changes, purchases and certain retirement plans, need lead time before December 31. A prompt review can show which items are still practical and which are not, based on your facts.
It depends on income, complexity and upcoming decisions. Businesses with rising or uneven income, owner pay questions, major purchases or multiple entities may find more to evaluate. Others may have few opportunities in a given year. Ask what you would receive.
