How to Normalize SDE: A First-Time Buyer's Guide

If you are evaluating a small business for the first time, you will quickly encounter a number called SDE — Seller's Discretionary Earnings. It is the single most important number in a small business acquisition. It determines what the business is worth, whether the deal passes SBA financing requirements, and whether you will be able to pay yourself after the loan closes.

The problem is that SDE as reported by a seller or broker is almost always wrong — not because they are lying, but because normalizing SDE requires judgment calls, and sellers have every incentive to make those judgment calls in their favor.

What Is SDE?

SDE stands for Seller's Discretionary Earnings. It represents the total financial benefit a full-time owner-operator receives from the business in a given year. The formula is:

Unlike EBITDA (used for larger businesses), SDE is designed for owner-operated businesses where one person runs the company and their compensation is wrapped into business expenses.

The Add-Back Problem

Add-backs are adjustments made to net profit to arrive at SDE. Legitimate add-backs include real expenses the business paid but that a new owner would not incur.

Legitimate add-backs:

• Owner salary and benefits
• Owner personal vehicle expenses run through the business
• One-time non-recurring expenses (roof repair, lawsuit settlement, one-time equipment purchase)
• Depreciation and amortization
• Personal travel or meals expensed through the business

Red flag add-backs:

• Discretionary expenses that are actually necessary to run the business
• Add-backs for employees the owner says you will not need
• Revenue from a contract that is expiring or not guaranteed to transfer
• Projected future revenue not yet earned
• Add-backs that appear in year one but not in prior years

How to Calculate Adjusted SDE Yourself

Step 1: Start with net profit from the most recent full-year tax return. Use tax returns, not P&L statements — sellers control their P&L, but the IRS controls their tax return.

Step 2: Add back the owner's total compensation — salary, health insurance, retirement contributions, and personal expenses run through the company.

Step 3: Add back genuine one-time expenses. Ask for documentation for every add-back over $5,000. If the seller cannot document it, do not add it back.

Step 4: Calculate your SDE margin. Divide adjusted SDE by total revenue. Compare to industry benchmarks. Unusually high margins are often a sign of over-aggressive add-backs.

Step 5: Run the same calculation for the prior two years. SDE should be consistent or growing. A business that shows dramatically higher SDE in the year it is being sold is a warning sign.

The SDE Margin Test

Industry SDE margin benchmarks:

If the seller-stated SDE margin is significantly above the top of the range for their industry, treat every add-back with skepticism.

What To Do With Your Adjusted SDE

Once you have calculated adjusted SDE, you can estimate the fair value range. Most small businesses in the $300K–$3M range sell for 2x–4x adjusted SDE depending on industry and quality. A $30,000 difference in adjusted SDE can mean $90,000–$120,000 difference in what the business is worth. Spend the time to get this number right before spending anything on attorneys or due diligence.