cost-calculation
SBA 504 Loan Payment Calculator (2026) — Bank + CDC Blended Payment, Equity Injection
SBA 504 is the SBA's owner-occupied real-estate and heavy-equipment loan program. The structure is a three-piece capital stack: a bank takes a 1st lien for 50% of project cost (at a variable bank-tier rate), a Certified Development Company (CDC) takes a 2nd lien for 40% funded via SBA-guaranteed debentures at a fixed below-market rate, and the borrower puts in 10-25% equity. This calculator estimates the blended monthly payment so you can see what the deal actually costs each month.
Educational estimate based on the inputs you entered — not financial, legal, or tax advice. Verify against your specific situation before acting on this output.
How it works
Methodology
Inputs
- Total project cost
- Combined acquisition + improvement cost. CDC portion caps at $5.5M per 13 CFR §120 Subpart H — excess shifts to the bank piece in this calculator.
- Borrower equity injection (%)
- 10% standard, 15% special-use property, 20% new business (under 2 years), 25% both. Determined by SBA SOP 50 10.
- Bank portion term (years)
- Amortization length of the bank 1st lien. Common: 10, 20, or 25 years. Typically matches CDC term for clean structures.
- CDC portion term (years)
- Fixed at 10yr (equipment), 20yr (mixed-use), or 25yr (real estate) under the 504 program.
- Bank rate (%)
- Bank 1st-lien rate. Typically variable (Prime-indexed) bank-tier pricing based on your file.
- CDC fixed rate (%)
- Set monthly when SBA debentures sell. Default 6.56% reflects the 2026-09-10 debenture pricing cycle — verify against current SBA 504 debenture rate.
Formula
CDC portion = 40% × project cost (capped at $5.5M, overflow shifts to bank) Bank portion = (100% − equity % − 40%) × project cost (+ any CDC overflow) Equity = equity % × project cost Monthly payment (each piece) = P × r × (1+r)^n / ((1+r)^n − 1) Blended monthly payment = bank monthly + CDC monthly Effective blended APR = (bank principal × bank rate + CDC principal × CDC rate) ÷ (bank principal + CDC principal)
Assumptions
- Bank piece is modeled as fully amortizing (no balloon). Some bank 1st liens on 504 deals amortize over 25 years with a 10-year balloon — verify your bank's structure.
- CDC rate is pre-filled at 6.56%, reflecting the 2026-09-10 debenture pricing cycle. Actual rate is set at funding when SBA debentures sell.
- Doesn't model CDC processing fees, SBA guaranty fee on the debenture, third-party reports (appraisal, environmental, title), or bank origination — those typically add 2-4% of project cost to closing.
- Assumes 40% CDC portion (the standard split). Some manufacturing and energy-efficiency projects qualify for higher CDC portions ($6.5M cap for manufacturing).
- Not an offer, not approval, not a binding pre-qualification. Actual structure depends on full underwriting at a specific bank + CDC.
- For scale: the SBA approved 77,600 loans through 7(a) and 6,750 loans through 504 in fiscal year 2025 — a combined 84,400 loans, the highest annual volume on record for the agency's two flagship guarantee programs.
Worked examples
$1.5M owner-occupied real estate · 10% equity
- Project cost
- $1,500,000
- Equity injection
- 10% ($150,000)
- Bank (1st lien)
- $750,000 @ 8.00% / 25yr
- CDC (2nd lien)
- $600,000 @ 6.54% / 25yr (fixed)
Blended monthly payment ≈ $9,855 ($5,789 bank + $4,066 CDC). Effective blended APR ≈ 7.35% on $1.35M financed. Total interest over life ≈ $1.61M.
$3M restaurant build-out · 15% equity (special-use)
- Project cost
- $3,000,000
- Equity injection
- 15% ($450,000)
- Bank (1st lien)
- $1,350,000 @ 8.50% / 25yr
- CDC (2nd lien)
- $1,200,000 @ 6.54% / 25yr (fixed)
Blended monthly payment ≈ $19,003 ($10,871 bank + $8,133 CDC). Effective blended APR ≈ 7.58% on $2.55M financed. Special-use equity injection materially reduces the financed amount.
$10M project · CDC at cap, overflow to bank
- Project cost
- $10,000,000
- Equity injection
- 10% ($1,000,000)
- Bank (1st lien)
- $3.5M @ 8.00% / 25yr
- CDC (2nd lien)
- $5.5M @ 6.54% / 25yr (capped)
CDC portion hits the $5.5M cap. Overflow ($500K) shifted to bank, making bank piece $4M instead of standard $5M. Blended monthly payment ≈ $68,147. Verify higher CDC cap eligibility for manufacturing / energy-efficiency projects.
Frequently asked
Questions readers ask
How is the SBA 504 capital stack structured? +
Standard 504 structure: 50% bank 1st lien (variable rate, bank-tier terms) + 40% CDC 2nd lien (fixed rate via SBA debenture) + 10% borrower equity injection. Equity injection rises to 15% for special-use property (hotel, gas station, restaurant), 20% for businesses under 2 years old, and 25% if both conditions apply. The CDC portion caps at $5.5M (or higher for manufacturing / energy-efficiency projects).
Is the SBA 504 CDC rate really fixed? +
Yes — the CDC portion is fixed at funding when SBA sells the underlying debenture. The rate resets monthly with each new debenture pool; your locked rate at funding is whatever the market priced that month. The bank 1st lien is typically variable (Prime-indexed). The calculator pre-fills 6.56%, reflecting the 2026-09-10 debenture pricing cycle (10-yr 6.600%, 20-yr 6.534%, 25-yr 6.541%) — verify against the current SBA 504 debenture rate before quoting a borrower.
What are the SBA 504 maximum loan terms? +
CDC portion: 10 years (equipment), 20 years (mixed-use), or 25 years (owner-occupied real estate). Bank 1st lien is typically 10, 20, or 25 years matching the CDC term — bank can also amortize over a longer schedule with a balloon. The blended payment in this calculator assumes both pieces are fully amortizing over their stated terms (no balloon).
When does SBA 504 make sense vs SBA 7(a)? +
504 wins for owner-occupied commercial real estate (≥ 51% owner-occupied) and major heavy equipment because the fixed-rate CDC portion locks in long-term certainty and the structure typically prices lower than a 7(a) on the same project. 7(a) wins for working capital, partner buyouts, business acquisitions without real estate, and any deal where you need a single-lender close. If the project is 80%+ real estate, default to running 504 math first.
What is the minimum equity injection for SBA 504? +
10% standard for established businesses (≥ 2 years operating) buying general-use property. 15% if the property is special-use (single-purpose: hotels, gas stations, car washes, restaurants, bowling alleys, etc.). 20% if the business is new (< 2 years). 25% if both conditions apply (new business + special-use property). 13 CFR §120 Subpart H sets these requirements.
Are there closing costs on top of the equity injection? +
Yes — 504 has CDC processing fees, SBA guaranty fees on the debenture, third-party report costs (appraisal, environmental, title), bank packaging and origination fees, and standard real-estate closing costs. The CDC and SBA fees are typically financed into the CDC debenture rather than paid out of pocket. Bank fees vary. Expect total third-party + closing costs in the 2-4% of project cost range — talk to your CDC and bank for specifics on your deal.
Can SBA 504 finance equipment, not just real estate? +
Yes — 504 finances long-lived heavy machinery and equipment with a useful life of 10+ years, alongside owner-occupied commercial real estate. The 10-year CDC term option exists specifically for equipment-heavy deals. The bank piece and equity-injection rules work identically for equipment as they do for real estate.
Read more
This tool is for educational purposes only and is not financial, legal, or tax advice. Final terms and eligibility depend on lender underwriting; consult a tax professional before acting on tax-tool output. ClearValue Lending is a funding platform.
https://clearvaluelending.com/tools/sba-504-payment-calculator