How to Calculate Seller's Discretionary Earnings (SDE)

Start with the right base number

The calculation begins with net income, sometimes called net profit or the bottom line, taken from the business's tax return (Schedule C, Form 1120, 1120S or 1065, depending on entity type) or from an internal profit and loss statement if the numbers tie out to what's reported to the tax authorities. Tax return net income is generally preferred because it's harder to dispute — buyers and lenders trust a number the business has already reported and paid tax on more than one produced only for a sale.

If internal financials are used instead, expect a buyer to ask why they don't match the tax return, and be ready to explain any differences, such as accrual versus cash accounting or timing of large invoices. Unexplained gaps between internal books and tax filings are one of the fastest ways to lose a buyer's trust early in a deal.

It's worth calculating SDE for each of the last three years, not just the most recent one, because buyers and lenders want to see a trend, not a single snapshot. A business with rising SDE over three years tells a very different story than one with the same total achieved through a one-off good year, even if the most recent number looks identical.

Whichever base year you start from, keep a copy of the actual return or statement next to your add-back worksheet. Every add-back should trace back to a specific line on that document, not to a memory of what happened during the year.

The standard add-backs, one by one

Owner's salary and payroll taxes: add back the compensation paid to one owner-operator, plus the employer-side payroll taxes on that compensation. The logic is that a new owner will pay themselves out of the business's earnings rather than draw a separate salary line, so that cost isn't a real cost for valuation purposes. Only one owner's compensation is added back in a business with a single full-time working owner; a second working owner is treated differently, covered below.

Personal expenses run through the business: this covers things like a personal vehicle payment, a family member on payroll who doesn't work in the business, personal travel booked as a business expense, or a phone plan covering the whole family. Each of these needs its own paper trail — an invoice, a loan statement, a phone bill — showing what portion was personal rather than a business need.

Interest expense: interest on business loans or a line of credit is added back because financing decisions are personal to the current owner's capital structure, not a cost that necessarily carries forward. A new buyer will have their own financing, often on different terms, so the current interest expense doesn't tell them anything about future costs.

Depreciation and amortisation: these are non-cash accounting entries reflecting the declining book value of assets already purchased, not cash actually leaving the business in the current year. They're added back because SDE is meant to measure cash-generating capacity, and a buyer will make their own capital expenditure decisions and depreciation schedule going forward.

One-time and non-recurring costs: a lawsuit settlement, a flood repair, a one-off consulting project, or moving costs from relocating premises are added back if they are genuinely unusual and unlikely to repeat. The test is whether a reasonable buyer would expect to face a similar cost in a normal year of running the business; if the answer is yes, it isn't a legitimate add-back.

Above-market rent to a related party: if the business rents premises from the owner or a family member at a rate meaningfully above (or occasionally below) fair market rent, the difference is adjusted so the analysis reflects what an unrelated landlord would actually charge. This matters because rent paid to a related party is really a form of owner compensation, not a market cost.

Add-backs buyers routinely reject

Not everything a seller wants to add back survives scrutiny. A common rejected item is a management or working-owner deduction: if you plan to add back your entire salary but you personally do meaningful, skilled work running the business, a buyer will often insist on deducting a fair replacement salary for whoever would need to be hired to do that job, rather than accepting the full add-back with nothing put back in for labour.

Vague or undocumented "discretionary" spending is another frequent rejection — claims like "I spent $15,000 in cash on business meals and gifts" without receipts, or a lump-sum guess at personal use of a company credit card without an itemised breakdown. Buyers and lenders generally require a specific, dated list, not an estimate.

Costs that look one-time but recur in a different form each year are also pushed back on. If the business has "unusual" repair costs, equipment breakdowns, or legal fees every single year, even if the specific item differs annually, a buyer will treat that as a normal cost of doing business rather than a legitimate add-back, because the pattern shows it isn't actually non-recurring.

Finally, buyers reject add-backs that double-count. If depreciation has already been added back, a seller can't also add back a related capital expenditure as if it were a separate one-time cost, and if a personal vehicle expense is added back, the associated interest on that vehicle loan shouldn't also be added back separately as generic "interest expense" without adjustment.

Multiple owners and a working spouse

SDE is built around the idea of one owner-operator replacing themselves in the business, so the calculation gets more nuanced with more than one working owner. The standard practice is to add back the compensation of one owner in full — usually the one who could plausibly be replaced by a single incoming buyer — while treating a second working owner's pay as a real operating cost, since the buyer will still need to either do that second job themselves or hire someone to do it.

A working spouse who draws a salary and performs real duties — bookkeeping, scheduling, customer service — is treated the same way: unless a buyer would reasonably expect to eliminate that role entirely, the fair market cost of replacing that function should stay in as an expense rather than be added back with the rest of ownership compensation.

Where a spouse is on payroll but performs little or no actual work, that pay functions like the personal-expense add-back described earlier — it can be added back, but only with the same documentation standard: a description of the role, evidence of limited actual duties, and consistency with how the rest of the business's staffing is documented.

In partnerships with several equal working owners, it's often more useful to build the SDE calculation, then separately show a pro forma staffing cost reflecting what a single buyer-operator would actually need to hire to replace the other partners' labour. That approach tends to hold up better under buyer and lender scrutiny than trying to add back every partner's full compensation.

SDE versus EBITDA, and when a buyer switches

SDE assumes one owner-operator draws a full personal benefit from the business and is the standard measure for small, owner-run businesses, roughly those valued under $2 million to $5 million, where the buyer will step directly into the owner's role. EBITDA (earnings before interest, taxes, depreciation and amortisation) does not add back an owner's salary at all — instead it assumes the business pays a market-rate manager to run it, whether that's the current owner, a new owner, or a hired general manager.

Buyers and their advisors typically switch from SDE to EBITDA once a business has grown past the point where a single owner realistically replaces themselves, generally once there's a management layer in place, meaningful revenue and profit, and the business could keep running smoothly with the current owner gone for an extended period. Private equity firms, search funds, and other buyers looking at larger deals almost always think in EBITDA terms rather than SDE.

The practical difference in the calculation is a market-rate management salary: when converting from SDE to EBITDA, a fair replacement salary for whoever runs the business day to day is deducted, rather than the full owner benefit being added back. That single adjustment is usually the largest gap between the two figures for a given business.

It's a mistake to use whichever number happens to look more favourable — buyers and lenders both know which measure fits a given size and structure of business, and using the wrong one is often read as either inexperience or an attempt to inflate the number.

Documenting add-backs for a lender

A lender, most often one processing an SBA loan for the buyer, will require every add-back to be supported by a specific piece of paper, not a narrative explanation from the seller. A salary add-back needs payroll records; a personal vehicle add-back needs the loan or lease statement and an explanation of business versus personal use; a one-time legal cost needs the invoice and a brief description of what it was for.

Lenders typically want add-backs organised in a schedule that lines up year by year with the tax returns, showing the reported net income, each add-back with its dollar amount and supporting document reference, and the resulting SDE total for each of the last two to three years. A clean, well-organised schedule signals a business that's been run with good records, which itself supports the lender's confidence in the deal.

Items that can't be documented are usually removed from the calculation before the file goes to underwriting, even if the seller genuinely believes they're legitimate. It's far better to present a conservative, fully supported SDE figure than an aggressive one that gets challenged and reduced during underwriting, since a reduced SDE late in the process can put the whole financing — and the deal — at risk.

Sellers who plan to sell within the next year or two benefit from starting this documentation early: keeping receipts for anything unusual, noting on invoices why a cost was one-time, and keeping personal and business spending as separate as possible going forward. A seller who has to reconstruct three years of add-back evidence from memory during a live deal is at a real disadvantage compared with one who's been filing it away as it happens.

From SDE to price: applying a multiple

Once SDE is calculated, it's turned into an estimated price by applying a multiple, expressed as a number of times SDE. Multiples for small, owner-operated businesses commonly fall in a range of roughly 2x to 4x, depending on the industry, the size of the business, customer concentration, growth trend, and how dependent the business is on the current owner.

The multiple isn't a fixed industry number applied mechanically — it moves within a plausible range based on the specific business's risk profile. Two businesses with identical SDE can sell for very different prices if one has diversified, contracted, recurring revenue and a manager in place, while the other depends entirely on the owner's personal relationships and has no written customer agreements at all.

Because the multiple is applied directly to SDE, an inflated or poorly documented SDE doesn't just overstate profit — it overstates price by that same multiple. A $20,000 add-back that gets rejected during diligence doesn't just cost $20,000; at a 3x multiple, it can reduce the supportable price by $60,000, which is why getting the add-backs right matters as much as getting the multiple right.

This is also why an SDE calculation with fully documented add-backs, ideally reviewed by an accountant or valuation professional before a business goes to market, tends to hold up through diligence far better than one assembled quickly to produce an attractive number. A number that survives scrutiny is worth more in practice than a larger one that collapses during buyer diligence.