Most people think about taxes once a year. They gather their documents in March, hand everything to someone, and hope the number that comes back isn’t too painful.
That’s tax preparation. It’s not tax planning. And confusing the two is one of the more expensive mistakes a small business owner can make.
The Difference Matters More Than People Realize
Tax preparation is recording what already happened. By the time you’re sitting across from a tax professional in April, the income has been earned, the expenses have been paid, and the decisions that determined your tax bill have already been made. A good preparer makes sure everything is reported correctly — but they’re working with a fixed set of facts.
Tax planning is making decisions before they become facts. It’s the conversation you have in October about whether to accelerate a deduction into this year or push it to next year. It’s the retirement contribution you make in November that reduces your taxable income. It’s the S-Corp election you file in February that changes how your entire year of income gets taxed.
By the time April arrives, most of that is locked in. Planning after the fact isn’t planning — it’s just accepting the outcome.
So When Should You Actually Start?
The honest answer is that tax planning doesn’t have a start date. It’s ongoing. But there are moments in the year where specific conversations matter more than others.
The best time to plan is while the year is still open. Start that conversation now instead of in April.
January and February — Set the foundation.
The beginning of the year is when you understand what last year actually looked like and set up this year correctly.
Did your quarterly estimated payments match your actual liability? If you owed a lot in April, your payments were probably too low. If you got a large refund, you overpaid — which means you gave the IRS an interest-free loan all year.
Is your business structure still right? If your net profit grew significantly last year, this is the moment to model whether an S-Corp election makes sense. The deadline to elect S-Corp status for the current tax year is March 15. If nobody raises this question in January or February, another year passes at the wrong structure.
Are your estimated payment amounts set correctly for this year? Based on what you expect to earn, what should you be paying each quarter?
April Through June — First reality check.
By mid-year you have enough data to see how the year is actually going versus how you expected it to go.
Is revenue tracking higher or lower than projected? If significantly higher, your quarterly payments may need to increase. If lower, you might be able to reduce them.
Did anything change in your business — new employee, major equipment purchase, new client, lost client — that has tax implications you haven’t accounted for?
This is also when many business owners decide to make mid-year retirement contribution adjustments if they realize they’re on track for a stronger year than expected.
September and October — The most valuable planning window.
This is where proactive tax planning does the most work. You have three months left in the year. You have enough financial data to project where you’re going to land. And you still have time to actually do something about it.
The conversations that happen in September and October can include:
Should you accelerate certain deductible expenses before year end — prepaying a subscription, stocking up on supplies, making a professional development investment you were going to make anyway?
Should you make a major equipment purchase before December 31? Section 179 allows you to deduct the full cost of qualifying equipment in the year it’s placed in service. Timing that purchase before year end versus January 2 is a simple decision with a real dollar impact.
Are you on track to maximize your retirement contributions? A solo 401k allows contributions up to $72,000 in 2026 for owners under 50. Every dollar is a deduction against taxable income. Most business owners contribute far less than they could — often because nobody raised it before it was too late.
November and December — Execute and close.
Last chance. Whatever moves made sense in October need to happen before December 31.
Charitable contributions, if you’re making them as part of your tax strategy, need to be completed by year end. Retirement contributions for most plan types need to be made before December 31 — though SEP IRA contributions can be made up to the tax filing deadline.
If you haven’t had a year-end planning conversation with your accountant yet and it’s November, initiate it now. Two months is enough time to act. January is too late for most of these moves.
The Trap Most Small Business Owners Fall Into
The reason most people don’t do any of this is that it requires initiating conversations rather than waiting for them to happen.
Your accountant is busy. Filing season runs from January through April at maximum intensity. Outside of that window, most firms are managing the volume of work from the previous season and preparing for the next one. Proactive outreach to every client throughout the year doesn’t always happen — not because professionals don’t care, but because the business model of most accounting firms is built around filing season.
The clients who get proactive tax planning are the ones who ask for it. They schedule the mid-year check-in. They reach out in October. They ask their accountant directly: what should I be doing differently before year end?
If you’ve never had any of those conversations, now is a reasonable time to start.
April is when the return gets filed, not when the decisions get made. That's why tax planning is built into our work with small business clients rather than treated as an afterthought.