The expertise you need. The attitude you want.
The expertise you need. The attitude you want.
Year-end tax planning checklist with an AI CFO agent
Most of the moves that lower a small business owner's tax bill have to happen before December 31. After that, your CPA can only report what already happened. The problem is that October through December is also when you're busiest, so the planning gets squeezed into a panicked week in late December, or skipped.
This guide gives you the checklist, then shows how an AI CFO agent can run it with you in a few short sessions. It follows the year-end workflow built into Vibewright's Fractional CFO · Tax Planner builds, which release on Monday, October 26, 2026 at 10:00 AM ET.
Step 1: Project the full year before you touch a lever
Every year-end decision depends on one question: roughly what will this year's income and tax be? Without it, you can't tell whether buying equipment now or pushing an invoice into January actually helps. Gather:
- Year-to-date net profit, plus what you expect for the rest of the year (a range is fine).
- Last year's total federal tax and AGI, from your Form 1040.
- Estimated payments made so far this year, with dates and amounts.
- Any W-2 withholding (yours or a spouse's).
- Your entity type, how you pay yourself, and your state.
An agent can turn that into a projected tax range, compare it with what you've paid, and show you the gap.
Step 2: Review the levers
These are the standard year-end levers the Tax Planner walks through. Not all of them fit every business, and the right ones depend on your numbers.
| Lever | What to check |
|---|
| Timing income and expenses | If you're on the cash basis, whether to bill or pay certain items before or after Dec 31 |
| Equipment purchases | Whether a planned purchase can be bought and placed in service by Dec 31, not just ordered |
| Retirement plans | Which plan fits (SEP-IRA, Solo 401(k), SIMPLE IRA) and its setup and funding deadlines for this year |
| S-corp owner payroll | Whether your salary for the year is reasonable and payroll is caught up before year-end |
| Charitable giving | Bunching gifts into one year, or giving appreciated assets instead of cash (concepts only, no asset picks) |
| Estimated payments | Whether you need to catch up before the Q4 estimate on Jan 15, 2027 |
| Loss harvesting | The concept and how it interacts with your other income, to take to your CPA or advisor |
Two rules worth remembering. First, deadlines for setting up and funding retirement plans differ by plan type and have changed in recent years, so verify this year's rules on IRS.gov or with your CPA before you count on one. Second, an extension to file is not an extension to pay.
Step 3: Rank by dollars saved vs. effort, and label the risk
A list of seven ideas isn't a plan. The Tax Planner ranks each lever by estimated dollars saved against the effort it takes, shows the math with labeled inputs, and tags each one:
- Standard: an ordinary, well-established move.
- Audit-sensitive: legal, but the kind of position that draws scrutiny (a very low S-corp salary is the classic example), so it recommends professional review.
It also shows your marginal and effective rates, because owners often overestimate what a deduction saves. A $5,000 purchase doesn't save $5,000 in tax.
Step 4: Build a dated checklist
The output of the workflow is a dated checklist that ends on December 31, plus a short January list. A typical shape looks like this (the dates are an example, not advice for your situation):
| When | Do |
|---|
| Early November | Finish the full-year projection and pick your top two or three levers |
| Mid November | Send your CPA a handoff packet with the levers and questions ranked by dollar impact |
| Early December | Open or confirm any retirement plan you chose; order equipment early enough to be in service |
| By Dec 31 | Make the payments, contributions and gifts you decided on; run the final S-corp payroll |
| January | Pay the Q4 estimate by Jan 15, 2027 and start gathering documents for your return |
With your approval, the agent can add those deadlines to your calendar with reminders. It never sends, pays, files or changes records without approval of the exact action.
Step 5: Bring your CPA in for the big calls
The agent gives educational information, not tax, legal or accounting advice. Its job is to make your CPA meeting shorter, cheaper and better: a one-page situation summary, the numbers it modeled with assumptions, a documents list, and 5 to 10 specific questions ranked by dollar impact. Audits, unfiled years, payroll tax problems and multi-state issues go straight to a professional.
How to run it with an agent
Load a Tax Planner build into your AI tool's standing instructions. For Claude, follow How to set up a Fractional CFO agent in Claude Projects. If you're choosing a tool, see Claude Project vs ChatGPT Project vs Gemini Gem for business agents. Then say "run onboarding," and after that, "run year-end planning." Turn on web browsing if your tool has it, so the agent can check current-year figures on IRS.gov instead of relying on training data. For what goes into the prompt itself, see Best system prompt for a tax-planning AI agent.
Pick the voice that actually gets you moving. Same facts and deadlines, five ways to hear them: Aggressive, Affirming, Dry, Funny or Sarcastic. See the five tones compared.
Get the Tax Planner before year-end
All five CFO · Tax Planner tones release on Monday, October 26, 2026 at 10:00 AM ET, with plenty of runway before December 31. They are not downloadable before then.
- Free sample: claim the CFO · Tax Planner · Funny build with your email. It is delivered on 10/26. License: Personal and commercial use allowed. No redistribution.
- Pick your tone: single build $9, role pack $49, launch bundle $79, All-Access $19/mo or $149/yr, or Founding Member $199 lifetime for the first 100. Checkout opens 10/26. 7-day refund on subscriptions. No refunds on downloads.
Choose your CFO Tax Planner tone on /pricing · Or grab the free Funny sample