SBA loans for other professional, scientific and technical services: the catch-all code, and what lenders need to see behind it

What SBA lenders approved, against the national figures

NAICS 541990 holds the professional and technical firms that the more specific codes do not: appraisers of things other than real estate, inspection firms that walk pipelines and utility lines, weather and meteorological services, patent brokers and a long tail of specialized advisory practices. From FY2024 through June 2026, SBA lenders approved 1,378 7(a) loans to them, worth $590,726,600, from 243 lenders. The median loan supported 4 jobs.

A quarter of loans were $75,000 or less, a quarter were $439,300 or more, and 144 loans, 10.4% of the total, were $1 million or more. Those are two different borrowers sharing one code: a small practice borrowing for working capital, often through SBA Express, and a larger firm being bought or buying its building.

A residual code means the underwriter starts from zero

When a lender sees a dental practice or a plumbing contractor, it already knows what the business earns on, what goes wrong and what the collateral is worth. A 541990 code tells it none of that. The first job of the file is to explain, in plain terms, what the firm sells, to whom, on what contract and how it gets paid. An underwriter who has to guess will guess conservatively.

The risks differ sharply by what the firm actually does, which is why the same code can produce a quick yes for one borrower and a long list of questions for another.

One document does most of the work here: a one-page description of the business, its customers and its revenue model, written for someone outside the field.

Cash flow carries the loan, because collateral is thin

Most of these firms own little that a lender can sell: computers, some field equipment, receivables and a brand. SBA does not decline a loan for thin collateral alone, but the lender must take the collateral that is available, which for an asset-light firm can include a lien on an owner's home. See SBA personal residence collateral. Every owner of 20% or more personally guarantees the loan.

So the decision rests on cash flow. SBA requires debt service coverage of at least 1.15x, and 1.0x globally once the owners' personal obligations are included. For a professional firm, the underwriter works through three things before trusting the number:

• Owner compensation. In a practice where the owner is also the lead professional, what the owner takes out has to be normalized to what it would cost to replace that work. An owner who pays themselves little makes the business look more profitable than it would be under someone else. See debt service coverage ratio.
• Customer concentration. Inspection and technical firms often live on a few large contracts. A lender will look at the share of revenue from the top customers and when those contracts end. See customer concentration in an acquisition.
• Timing of project revenue. Project-based firms bill in lumps. Cash-basis books can make one year look strong and the next weak for reasons that have nothing to do with the business. See cash versus accrual financials.

SBA caps variable 7(a) rates at the base rate plus 6.5% for loans of $50,000 or less, plus 6% from $50,001 to $250,000, plus 4.5% from $250,001 to $350,000 and plus 3% above $350,000. Those caps are why acquisition loans here, at a median of $605,000, priced at a median 9.5%, a point below the industry's 10.5%: larger loans sit under a tighter cap. Size does not explain the gap to the national 10.25%, since the industry's median loan is the same as the national one; that quarter point reflects how lenders priced these borrowers, not the cap. See SBA loan rates.

Buying a firm whose value is its people

157 loans, 11.4% of the industry's total, financed a change of ownership, at a median of $605,000 and a median rate of 9.5%. That is about four times the industry's median loan. Most of that price is usually goodwill: the value of relationships, credentials and know-how that currently live in the seller.

A lender financing that goodwill wants to see how it transfers. The seller may not stay on as an owner, officer or employee after a complete change of ownership, but may consult for up to 12 months, or up to 24 months under SOP 50 10 8.1 from 1 October 2026. In a technical firm, that consulting period is when client relationships and credentials move to the buyer, and the plan for it belongs in the file. The buyer's own background matters as much: a lender will ask whether the buyer can do or supervise the work. See buyer industry experience requirements.

The standard acquisition rules apply:

• Equity of at least 10% of total project costs. A seller note counts toward up to half of it only on full standby, with no principal or interest paid, for the life of the SBA loan. See seller notes and SBA standby.
• No earnout to the seller. A firm whose price depends on keeping a few large contracts cannot bridge that risk with a contingent payment; that risk has to be settled in the price instead. See earnouts and acquisition debt.
• An independent business valuation where the amount financed, less appraised real estate and equipment, exceeds $250,000, which covers the typical deal here. The loan cannot exceed the valuation.
• From 1 October 2026: financial due diligence on every change of ownership, a quality of earnings report where the purchase is $3 million or more excluding real estate, 1.25x coverage on historical results, and amortization of no more than 10 years except for any real estate.

Contracts need a look before the letter of intent is signed. Master service agreements with utilities and large companies often require the customer's consent to an assignment or a change of control, and a lender will want those consents in hand. See change-of-control consents.

In a professional firm, the lender is financing relationships. Show how each major one moves from the seller to the buyer.

Owning the office or the lab

169 SBA 504 loans went to firms in this code, at a median of $702,000, more than the median acquisition. These are firms buying the building they work from, which for a technical practice may include lab or workshop space. The 504 structure is typically 50% from a bank, 40% from the CDC and 10% from the borrower (15% for a new business or special-purpose property, 20% for both). The firm must occupy at least 51% of an existing building, or 60% of new construction. A 7(a) loan can also finance real estate, over up to 25 years. See SBA 7(a) vs 504.

Preparing a professional firm's SBA file

The standard SBA list comes first: business tax returns for 2–3 years, a P&L and balance sheet with a year-to-date P&L through last month-end, a debt schedule with copies of notes being refinanced, and personal tax returns and a personal financial statement for each owner of 20% or more. For a firm in this code, add:

• A one-page description of the business: what it sells, to whom, and how it is paid
• Revenue by customer for the last two full years, with the contract term for each major customer
• Copies of master service agreements or retainer agreements for the largest customers
• Professional licenses and certifications, and who holds them
• For an acquisition, the letter of intent and the target's latest full year of figures, never an older year
• The owner's or buyer's resume, which supports Form 1919's management experience

Transparent reads that file the way an underwriter will and builds the full lender package, financing model, lender presentation, blind teaser and underwriting memo, in a day once the documents are in. Its book holds 278 lenders that write SBA 7(a) and 504. For a residual code, matching the file to lenders that already understand the specific business is much of the value. On SBA loans the lender pays Transparent, not the borrower. For firms in neighboring codes, see engineering services and scientific and technical consulting.