The best time to start tax planning for next year is January of that year. The second best time is right now, whatever month you’re reading this. Tax planning is fundamentally about making decisions during the year that reduce your tax bill. Once the year is over, most of those decisions can no longer be made.

There’s a meaningful difference between tax planning and tax preparation. Preparation is looking backward at what already happened and filling out the forms. Planning is looking forward and making choices that put you in a better position. Most business owners only do the first part and wonder why their tax bill is so high.

In January through March, you should be reviewing the prior year with your accountant and setting intentions for the current year. This is when entity structure changes matter most. If switching from a sole proprietorship to an S-corp would save you money, the S-corp election (Form 2553) is due by March 15 for the current tax year. Miss that window and you’re waiting another full year to benefit.

During Q2, a mid-year check-in helps you see where your income is tracking and whether your estimated tax payments are on pace. This is also the time to evaluate whether you’re maximizing retirement contributions. Setting up a SEP-IRA or Solo 401(k) and funding it throughout the year is far easier than scrambling to make a lump-sum contribution before the filing deadline.

Q3 is when you still have time to act on most strategies. Purchasing equipment or vehicles before year-end for Section 179 deductions, timing large expenses, accelerating or deferring income if you have that flexibility. You need accurate books to make these calls, which is where consistent small business bookkeeping pays off. You can’t plan around numbers you don’t have.

By Q4, your options are narrowing. October through December is when most people suddenly think about tax planning, but several doors have already closed. You can still make purchases, contribute to retirement accounts, and time some invoicing. But structural changes and broader strategies needed earlier groundwork.

The business owners who pay the least in taxes relative to their income aren’t doing anything aggressive. They’re just planning earlier. They know their projected income by mid-year. They’ve already talked to their accountant about what moves to make. They’re adjusting throughout the year instead of reacting in April.

If you haven’t been doing tax advisory work with someone who knows your business, start with a single planning conversation. Even one meeting in Q1 or Q2 can save thousands compared to waiting until your tax return is being prepared and realizing what you could have done differently.

The cost of waiting is never obvious in the moment. It shows up as a bigger tax payment that didn’t need to be that big.