The SBA 504 loan is the government's long-term, fixed-rate program for buying buildings, building buildings, and financing heavy equipment — often with just 10% down. But 504 has its own rulebook: occupancy tests, size standards, job-creation goals, and a three-party structure involving a bank, a CDC (Certified Development Company), and you. This guide covers exactly what you must qualify for and what you'll need to hand over, so you can walk into the process prepared.
How a 504 loan is structured (and why requirements come from two lenders)
A 504 project is funded by three parties, which is why you're effectively underwritten twice:
| Piece | Who funds it | Typical share | Terms |
|---|---|---|---|
| First mortgage | Bank or credit union | ~50% | Bank's own rates and terms, usually 10–25 years |
| CDC/SBA debenture | CDC, backed by an SBA-guaranteed bond | Up to 40% | Fixed rate, 10-, 20-, or 25-year term |
| Borrower contribution | You | 10%–20% | Cash or, in some cases, equity in land you already own |
The CDC portion is capped at $5 million per project ($5.5 million for small manufacturers and certain energy projects). The bank's half has no SBA cap, so total projects well above $10 million are common. Program rules live at SBA.gov's 504 page — everything below tracks that rulebook.
Both the bank and the CDC must approve you. The bank cares most about collateral and cash flow; the CDC also verifies SBA eligibility, size standards, and economic-development goals.
Business eligibility requirements
To qualify, your company must check every one of these boxes:
- For-profit operating business located in the U.S. (or its territories). Passive real-estate investment companies don't qualify — though a common, allowed structure is a holding LLC that owns the building and leases it to your operating company (an "EPC/OC" structure).
- Meets the 504 size standard: tangible net worth of $15 million or less and average net income after federal taxes of $5 million or less for the two fiscal years before you apply.
- Doesn't operate in an ineligible industry: lending, life insurance, gambling, speculation, and certain others are excluded.
- Owners of 20%+ provide a personal guarantee, and all owners must meet SBA character requirements (a criminal-history questionnaire is part of the file).
- Good standing on federal debt — prior defaults on government-backed loans (including SBA or federal student loans, in some cases) can disqualify you.
Eligible uses — and the occupancy test
504 proceeds must fund fixed assets. Eligible uses include:
- Purchasing an existing building (and the land under it)
- Ground-up construction of a new facility
- Major renovations or expansions, including some site improvements, parking, and utilities
- Long-life equipment — machinery with a useful life of at least 10 years (think manufacturing lines, printing presses, medical imaging)
- Refinancing qualifying existing commercial debt, under the 504 refinance rules
Ineligible uses: working capital, inventory, most goodwill in a business acquisition, rolling stock in most cases, and speculative or rental-only real estate. If your project mixes needs — say, a building purchase plus $200,000 of working capital — the working capital piece typically needs a separate SBA 7(a) loan or line of credit.
The occupancy requirement is where many deals die, so measure your square footage before you apply:
| Project type | Your business must occupy |
|---|---|
| Existing building | At least 51% at purchase |
| New construction | At least 60% immediately, with plans to occupy 80% within roughly 10 years |
You can lease out the remainder, which makes 504 a legitimate way to buy a building bigger than you currently need — but an Owner-Occupied use is non-negotiable.
The down payment: 10%, 15%, or 20%?
Your required Down Payment (Equity Injection) depends on two risk factors:
| Situation | Required contribution |
|---|---|
| Established business, general-purpose property | 10% |
| Business under 2 years old (startup) OR special-purpose property | 15% |
| Startup AND special-purpose property | 20% |
"Special-purpose" means a building that's hard to convert to another use — hotels, gas stations, car washes, wineries, bowling alleys, and similar. Land you already own can often count toward your contribution at appraised value.
Worked example — $1,500,000 building purchase, established HVAC contractor:
- Bank first mortgage (50%): $750,000
- CDC/SBA debenture (40%): $600,000
- Your contribution (10%): $150,000
If the same building were a car wash (special-purpose), your contribution rises to 15% ($225,000) and the CDC piece drops to 35% ($525,000). Compare that with conventional commercial real estate financing, which usually wants 20%–30% down — the 504's smaller injection is its single biggest advantage.
Repayment ability: what underwriters actually check
Both lenders will test whether your cash flow covers the combined new payments. The key metric is your Debt Service Coverage Ratio (DSCR) — annual cash flow available for debt service divided by annual debt payments. Most banks and CDCs want to see roughly 1.15x to 1.25x or better, calculated on your historical tax returns, not just projections.
They'll also look at:
- Personal credit of all guarantors — no SBA minimum, but mid-600s+ is the practical floor for most lenders
- Business credit and payment history, including any tax liens or judgments
- Trends — declining revenue two years running invites hard questions even if DSCR technically clears
- Post-project liquidity — you shouldn't be draining every dollar of savings into the injection
- Management experience, especially for startups or acquisitions, usually documented with resumes
One underappreciated benefit: for many owners currently renting, the new 504 mortgage payment is comparable to (or less than) rent, which makes the DSCR math straightforward. A one-page rent-vs-payment comparison in your application file helps underwriters see it quickly. Our 504 rates guide covers how the fixed debenture rate is set.
SBA 504 document checklist
Here's what a complete file looks like. Gathering these before you approach lenders can shave weeks off the 60–90 day typical timeline.
Business financials
- Business tax returns — last 3 years
- Interim Profit & Loss Statement (P&L) and Balance Sheet (dated within 60–90 days)
- Business Debt Schedule listing every existing loan, balance, payment, and lender
- Accounts receivable and payable agings (some lenders)
Personal (each 20%+ owner)
- Personal tax returns — last 3 years
- Personal Financial Statement (PFS) — SBA Form 413
- Government-issued ID and personal history questionnaire (SBA Form 1919)
Project documentation
- Purchase agreement or letter of intent for the property
- Construction cost estimates, contractor bids, and plans (for construction/renovation)
- Equipment quotes with useful-life documentation (for equipment projects)
- Current lease agreements for any tenant space
- Rent rolls, if the building has existing tenants
Entity documents
- Articles of Incorporation or organization, operating agreement or bylaws
- Business licenses and EIN documentation
- Franchise agreement, if applicable
Ordered during underwriting (lender-driven, but budget for them)
- Commercial appraisal
- Environmental report (Phase I, sometimes Phase II)
- Title work and survey
Where deals go sideways — and how to protect yours
The most common 504 failure points, in rough order of frequency:
- Occupancy miscalculation. Measure usable square footage carefully; 49% owner-occupancy is a dead deal.
- Injection sourced from another loan. Your contribution generally must not come from borrowed funds secured by project assets. Document the source of your down payment early.
- Special-purpose surprise. Owners budget 10% down, then learn their property type requires 15%. Ask the CDC to classify the property before you sign a purchase agreement.
- Environmental findings. A former dry cleaner or gas station on-site can trigger a Phase II study, adding cost and 30+ days.
- Stale financials. Interim statements older than 90 days get rejected; keep your books current throughout the process.
Because a 504 requires a willing bank for the first-mortgage half, the bank you choose matters as much as the CDC. Rates, fees, terms, and appetite on the bank portion vary widely — one bank may pass on your industry while another competes for it. That's where a financing marketplace helps: one application reaches multiple lenders who compete on the conventional piece, and you can compare 504 structures against 7(a) and conventional commercial real estate offers side by side before committing.