2025 is filed. 2026 is still a draft.

Somewhere around October 15, a very specific kind of relief settles over business owners. The extended 2025 return is finally out the door. The CPA stops emailing. The shoebox goes back in the closet. And the tax bill, whatever it turned out to be, becomes a sunk cost.

Here is the uncomfortable truth behind that relief: by the time you filed, there was almost nothing left to decide. A tax return is a history book. Every number on it was locked in on December 31, and the months of extension work that followed were mostly about reporting the past accurately, not changing it.

The 2026 return is a different animal. As of this writing, it is still a draft. There are roughly 15 weeks left in the year, and nearly every lever that matters is still movable. If you own a business, earn well, or hold real estate, the most valuable tax conversation you will have all year is the one that happens right now, not next April.

“The number on your last return was already decided. The number on the next one is still up to you.

The extension trap

The IRS is clear that an extension gives you until October 15 to file without penalties, and just as clear that the extension is only for filing your return. It is not an extension to pay, and it certainly is not an extension to plan.

That distinction gets lost in practice. Owners who extend often spend the summer in a holding pattern, waiting to see what 2025 “came out to” before thinking about 2026. By the time the answer arrives, the year is three-quarters gone. The result is a permanent cycle of looking backward: filing late, learning the number, being frustrated by the number, and repeating the process. We wrote about the fix in the June 1st projection: move the meeting forward, while the year is still negotiable.

Breaking that cycle means treating the fall as the beginning of the tax year rather than the end of the last one. A forward tax projection built now still has runway. One built in March is an autopsy.

Why 2026 is not a normal year

Most years, the fourth quarter is about timing income and expenses at the margins. This year the rulebook itself changed. The One Big Beautiful Bill Act, signed in July 2025, restored 100 percent bonus depreciation on a permanent basis, made the 20 percent qualified business income deduction permanent, restored immediate expensing of domestic research costs, and lifted the federal estate exemption to $15 million per person for 2026. It also raised the state and local tax deduction cap to $40,000, with a phase-down above $500,000 of income and a scheduled revert to $10,000 in 2030. See the Tax Foundation summary of the changes.

Every one of those provisions is a planning decision, not a filing decision. Bonus depreciation only helps if the equipment, vehicle, or building improvement is placed in service before year-end. The QBI deduction only reaches its full 20 percent if your taxable income, wages paid, and entity structure line up — which means the S-corp salary and the retirement contribution have to be set before December, not reconstructed in March. The SALT phase-down means a six-figure owner may keep the full $40,000 deduction with a modest income shift that is only possible while the year is still open.

Retirement plans tell the same story. The IRS raised the 2026 401(k) deferral limit to $24,500, the age-50 catch-up to $8,000, and the special age 60 to 63 catch-up to $11,250. See IRS IR-2025-111. For an owner with no employees, a solo 401(k) or cash balance plan layered on top can shelter several times that amount. But the plan has to exist by year-end and the payroll deferrals have to actually run through payroll. A great idea discovered in April is just a story about what could have been.

What a fourth-quarter plan actually looks like

A real projection, not a guess, is the starting point. Take year-to-date income through September, annualize it honestly, and layer in the fourth-quarter items you already know about: the distribution you are planning, the equipment you have been putting off, the property closing scheduled for November. That is what our tax projection model is built to do — one decision model, not five disconnected tactics.

• Is your reasonable compensation set at the level that maximizes both the QBI deduction and your retirement contribution room?
• Should a planned purchase move up 60 days to land in 2026, or is next year the better home for it?
• Does a Roth conversion make sense in a year where you have unusual deductions to absorb it?
• Are your estimated payments tracking the projection, or are you about to be surprised by an underpayment penalty on top of the tax itself?

None of these are exotic strategies. They are ordinary decisions that only work in one direction: forward. That is why our process runs project, model, decide, execute — in that order, before the deadlines close. You can see the math in a $1.2M bill cut by $780K, not because of one clever move, but because five ordinary moves were sequenced in time.

Do this before Thanksgiving

The practical window for most of this closes in early December. Retirement plan documents take time. Equipment has to be delivered and placed in service, not just ordered. Entity elections have effective dates. Charitable contributions of appreciated stock require a transfer, not a promise. The earlier the projection is built, the more options stay on the table.

If your 2025 return just went out the door, congratulations. Now schedule the 2026 meeting before the relief wears off. Filing is hygiene. Planning needs runway.