How to Prepare for Taxes When Selling Your Business: a CPA’s Guide

Last Updated on April 30, 2026 by Ewen Finser

Start Tax Planning Before the Buyer Shows Up

Most founders start thinking about taxes after the letter of intent shows up, and I think that is totally backwards.

By the time a buyer is serious, the tax levers may already be locked in. Your entity structure is what it is. Your books either support the story you have been telling, or they do not. Your working capital, payroll, debt, owner expenses, add-backs, receivables, fixed assets, and contracts are either clean enough for diligence, or they become bargaining chips for the buyer, which ultimately costs you money. This is why tax planning for a business sale should start twelve months before you expect to go to market.

Not every owner needs some complex tax shelter, and I’d wager to say most do not. The real reason is simpler: the tax result of a sale depends on the facts of the business, and those facts need time to clean up, document, and structure.

A good finance partner does not come in at the end and say, “Good luck, call me after closing.” A good finance partner helps you understand how the deal may be taxed, what you can control, what you cannot control, and which financial issues need to be fixed before a buyer finds them.

There are firms out there that can help with this and can save you quite literally hundreds of thousands of dollars for the cost of their fee. For instance, Pillar Advisors plays for owners preparing for a sale. Tax planning and financial cleanup are not separate projects. They feed each other.

What You Really Need to Ask Before Selling

The First Question: “How much tax will I owe?”

That is almost always the first question every founder wants answered. It is also usually the wrong starting point! The better first question is: What exactly am I selling?

A business sale can be structured in different ways. You may sell equity in the company. You may sell the assets of the business. You may sell certain assets and keep others. You may roll part of your ownership into the buyer’s new entity. You may receive cash at closing, seller financing, an earnout, or some mix of all three. Each version can produce a different tax result, and this can all be very confusing.

The IRS does not treat all business assets the same. A business may hold capital assets, depreciable property, real estate used in the business, inventory, receivables, goodwill, customer lists, and other intangible assets. The gain or loss is generally figured separately by asset class, and inventory can create ordinary income while capital assets may create capital gain.

That is why a founder cannot look at a $5 million sale price and assume the tax answer is clean. A $5 million stock sale is not the same as a $5 million asset sale. A deal with $4 million allocated to goodwill is not the same as a deal with heavy allocation to inventory, equipment, or receivables. A deal paid all in cash is not the same as a deal paid over five years. Ultimately, what I’m getting at is the headline price does matter, but the structure may matter more.

Asset Sale vs. Equity Sale: The Tax Fight Hiding Inside the Deal

In many lower-middle-market deals, buyers prefer asset purchases. They often want to pick the assets they are buying, avoid certain liabilities, and receive a stepped-up basis in the acquired assets. Sellers, on the other hand, often prefer selling equity because it can be cleaner and may create more favorable capital gain treatment. This tension is normal.

It is also one of the main reasons you want your tax team involved before you sign a letter of intent. In an asset sale, the purchase price usually must be allocated across the assets sold. Both the buyer and seller may have to report the allocation to the IRS when a group of assets that makes up a trade or business is sold. That allocation is not a side issue. It can decide how much of the sale gets taxed as capital gain and how much gets taxed as ordinary income.

For example, the seller may want more value assigned to goodwill because that often supports capital gain treatment. The buyer may prefer more value assigned to assets it can depreciate or amortize sooner. Neither side should treat the allocation as a closing-table afterthought because it belongs in the negotiation.

This is where a finance partner earns its keep. A firm like Pillar Advisors can help model the tax impact of different allocations before the founder agrees to terms. The goal is not to win every tax point. The goal is to understand the cost of each concession.

A buyer may offer a higher purchase price but push for a structure that creates more ordinary income to the seller. Another buyer may offer less headline value but a better structure. Without modeling, the founder may choose the wrong deal because the gross number looks better.

Capital Gains Are Only Part of the Story

Most founders hear “business sale” and think “capital gains”, and that is a fair, but incomplete thought.

Capital gain generally exists when you sell an asset for more than your adjusted basis. The IRS explains the basic rule this way: if you sell an asset for more than adjusted basis, you have a capital gain; if you sell it for less, you have a capital loss.

For many sellers, long-term capital gain rates are better than ordinary income rates. For taxable years beginning in 2025, the IRS says most net capital gain is taxed at no more than 15% for most individuals, with some gain taxed at 0% and higher-income taxpayers potentially subject to 20%. But business sales rarely fit into one neat bucket.

Depreciation recapture may apply. Inventory may be ordinary income. Consulting agreements may create ordinary income. Noncompete payments may have their own treatment. Earnouts may shift timing. Seller notes may raise installment sale issues. State taxes may change the answer again. All this means is that the founder’s tax estimate needs to include more than the capital gain rate.

It needs to include the character of the gain, timing of payments, other income in the year of sale, state tax exposure, entity-level tax, owner-level tax, and whether any special rules apply.

The Decisions Made Twelve Months Out Can Affect the Tax Outcome Later

This is where sale planning becomes practical. Twelve months before a sale, the founder may not know the final buyer or final structure, and that’s absolutely okay. The goal is not to predict every term. The goal is to get the business ready, so the founder has options.

If the books are messy, the buyer gains leverage. If personal expenses run through the business, the buyer may question EBITDA. If revenue recognition is sloppy, the buyer may push for a quality of earnings adjustment. If the fixed asset schedule does not match the tax return, the tax model gets harder. If related-party transactions are not documented, diligence slows down. If owner compensation is not clean, add-backs become a fight.

These are not just accounting issues. They become tax issues because the tax answer depends on the financial facts. When prepping for a sale, work needs to be done well before the buyer is sitting at your table. That can include normalizing the chart of accounts, cleaning up the balance sheet, reviewing debt and owner distributions, tying fixed assets to depreciation records, separating personal and business expenses, documenting add-backs, and preparing trailing twelve-month financials a buyer can trust.

This work is not glamorous, but it’s also one of the best ways to protect value. A founder who waits until diligence begins may spend the deal process defending the books instead of negotiating the deal.

The Purchase Price Is Not Always the Tax Base

Founders often assume the tax calculation starts with the purchase price. That’s a good assumption, but it doesn’t always work that way.

The tax calculation starts with proceeds, basis, liabilities, transaction costs, and allocation.

Basis matters because gain is measured against basis. If the founder has low basis, the taxable gain can be huge. If the entity has debt, the debt treatment may affect the calculation. If the owner has taken distributions, used losses, or changed ownership over time, basis may require a deeper review. The sooner this review starts, the better.

Some tax planning moves cannot be fixed at closing. Others may require months or years to work. Even when no major restructuring is possible, early review can prevent bad assumptions from driving the negotiation.

Payment Timing Can Be Just as Important as Price

Not every sale is paid in full at closing. Some deals include seller financing. Some include earnouts. Some include escrow holdbacks. Some include rollover equity. Each piece needs tax review.

Installment sale treatment may allow a seller to report gain over time when at least one payment is received after the tax year of sale. The IRS describes an installment sale as a sale of property where the seller receives at least one payment after the tax year of the sale.

That sounds simple, but it’s not always.

The installment method may not apply to everything. For instance, inventory is generally excluded. Depreciation recapture can still be recognized sooner. Interest must be handled. If the buyer defaults, the seller has a business problem and a tax problem.

Earnouts can be even messier. A founder may not know the final sale price until future performance targets are measured. That can create tax timing questions and reporting issues. It can also create tension if the founder no longer controls the business after closing, but the earnout depends on post-closing results.

A rollover can also be attractive, but it should be modeled. Rolling equity may defer some tax or keep the founder invested in future upside, but the details matter. What entity will hold the rollover interest? What rights does the seller have? What happens on a second sale? Is the rollover taxable now, partly taxable, or intended to be tax deferred? A founder should not agree to these terms based only on the business headline. The after-tax cash flow matters.

Clean Financials Support Better Tax Planning

Tax planning gets weaker when the accounting is weak.

A founder might want to argue that most of the value is goodwill. But if the financials do not support the earnings story, that argument loses weight. A founder might want to claim certain add-backs. But if those add-backs are not documented, the buyer may cut them. A founder might want favorable working capital treatment. But if receivables, payables, and deferred revenue are not clean, the negotiation gets harder.

This is why it can be important to have a firm like Pillar that combines tax planning with financial cleanup.

The tax model should tie back to the financial statements. The financial statements should tie back to tax returns. The tax returns should match the story being told to buyers. If those pieces conflict, buyers notice.

A strong finance team can help prepare the sale file before the buyer asks for it. That file may include monthly financial statements, tax returns, payroll reports, debt schedules, fixed asset listings, revenue detail, customer concentration, working capital schedules, owner add-backs, and support for one-time expenses.

Instead of scrambling, the seller can respond. Instead of explaining every inconsistency, the seller can show a clean trail. That does not make the deal easy. It makes the deal more controlled.

What a Good Tax Planning and Finance Firm Does

The best time to reach out to an outsourced firm is before the banker, broker, or buyer is driving the timeline.

The work usually starts with a sale-readiness review. That means understanding the entity structure, ownership, basis, historical tax filings, balance sheet, revenue streams, fixed assets, debt, and likely buyer profile.

From there, the advisor can build tax models around possible deal structures. What happens in a stock sale? What happens in an asset sale? What if part of the price is allocated to goodwill? What if there is seller financing? What if there is an earnout? What if the owner rolls equity?

The model will not be perfect because the deal is not final. But it gives the founder a decision framework.

At the same time, the advisors can help clean the financials that support the sale. That may mean improving monthly close, tightening reconciliations, cleaning up old balances, reviewing revenue and expense classification, documenting add-backs, and preparing financial packages that can survive buyer review.

Tax planning without clean financials is theory. Clean financials without tax planning can still leave money on the table. Owners need both.

Ultimately, the Real Goal Is Control

Selling a business is complex, as there are lawyers, bankers, buyers, lenders, tax advisors, and diligence teams. Each has a role, and each has an angle. The founder sits in the middle, trying to protect the value they spent years building.

The tax side can feel like one more moving piece. But when handled early, it becomes a source of control.

You know which deal terms matter. You know where the tax risk sits. You know what structure you prefer and what concessions cost. You know whether the books support the story. You know what questions the buyer is likely to ask. You know when to push back and when to accept a trade-off. All of this is the point of planning.

If you are thinking about selling in the next year, start now. Review your structure. Clean up the books. Model the tax outcomes. Get your finance team involved before the buyer sets the pace.

A sale is not just a transaction. It is the financial harvest of years of work. Treat the tax planning with the same care.