SBA Loan Calculator — Free 7(a), 504 & Microloan Payment Tool 2026

The bank quoted you a conventional business loan at 9.5%. Your SBA lender quoted 12.75% variable. The SBA rate looks worse — until you see the term. The conventional loan is 5 years. The SBA 7(a) is 10 years. Same monthly budget, two very different amounts you can actually borrow. And neither quote included the SBA guarantee fee — which adds thousands to your total cost upfront.

This calculator handles all four SBA loan types — 7(a) Standard, 7(a) Express, SBA 504, and Microloan — with the guarantee fee auto-calculated, true APR shown after all fees, an eligibility quick-check, and a direct comparison between SBA and conventional business loan costs. No lender redirect. No lead form.

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What This SBA Loan Calculator Shows

SBA Loan Payment Calculator — Monthly Payment Across All Loan Types

Enter your loan amount, type, and purpose and the tool instantly shows your estimated monthly payment. For 7(a) loans, it calculates both the variable rate (Prime + spread) and fixed rate options. For SBA 504, it separates the bank portion and SBA debenture portion into a blended monthly payment.

True APR With SBA Guarantee Fee and Lender Fee

Most SBA loan calculators — including those from Bankrate and NerdWallet — show payment based on the stated interest rate only. This tool calculates your True APR by factoring in the SBA guarantee fee (auto-calculated from your loan amount using SBA’s published schedule) and the lender fee you enter. On a $250,000 7(a) loan, the guarantee fee alone is $5,625 — adding it to the APR calculation moves your effective rate from 12.75% to 13.86%.

SBA Guarantee Fee Auto-Calculation

The SBA guarantee fee is charged on the guaranteed portion of your loan — not the full loan amount. The fee tier depends on loan size and term. The tool calculates this automatically when you enter your loan amount so you don’t need to reference SBA’s fee schedule manually.

SBA 7(a) vs Conventional Business Loan Comparison

The comparison table at the bottom shows your SBA loan payment, total interest, and total cost side by side against a conventional business loan at the current average rate. For $250,000: SBA adds approximately $35,959 in total cost versus conventional — but the SBA loan term is longer, the monthly payment is lower, and the down payment requirement is 10% versus 20–30% conventional. The comparison shows the full tradeoff.

Eligibility Quick-Check

Enter your credit score, years in business, and annual revenue. The tool flags whether you meet SBA’s basic eligibility thresholds (650+ minimum credit score, 680+ preferred; 2+ years in business; revenue to support debt service). This isn’t an approval — it’s a pre-screen to tell you whether applying makes sense before you spend time on paperwork.

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SBA Loan Payment Calculator — How Your Payment Is Calculated

What Drives Your Monthly SBA Loan Payment

Your SBA monthly payment depends on four variables: loan amount, interest rate type (variable or fixed), loan term, and loan purpose (which determines your maximum term). Variable rate loans use Prime + a lender-set spread. Fixed rate loans lock the rate at closing for the full term.

Variable vs Fixed Rate SBA Loans

Variable Rate (Prime + Spread)

Most SBA 7(a) loans are variable rate. The rate = Prime Rate + lender spread. In 2026, the Prime Rate is 6.75%. SBA caps the spread lenders can charge based on loan size and term:

Loans under $50K: Prime + up to 6.5%
Loans $50K–$250K: Prime + up to 6% (max 12.75% variable)
Loans $250K–$350K: Prime + up to 4.5%
Loans over $350K: Prime + up to 3%

The rate tier hint below the rate field shows exactly which spread tier applies to your loan amount.

Fixed Rate SBA Loans

Fixed rate SBA loans are available but less common. The fixed rate is negotiated with the lender and typically runs 0.5%–2% above the variable rate equivalent at origination. Fixed rates offer payment certainty — useful for businesses that need stable forecasting. The tool lets you toggle between variable and fixed and shows the payment difference.

SBA Loan Term by Purpose

Working Capital and Equipment — 7 or 10 Years

SBA 7(a) working capital loans: maximum 10 years. Equipment loans: maximum 10 years. The tool pre-selects 7 years for working capital and allows extension to 10 years. Shorter terms mean higher monthly payments but significantly less total interest.

Real Estate — Up to 25 Years

SBA 7(a) real estate loans: maximum 25 years. SBA 504 loans for real estate: 10 or 25 years. The 25-year term is only available for commercial real estate purchase or construction. The tool unlocks 25-year term only when “Real Estate” is selected as loan purpose — consistent with SBA guidelines.

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SBA 7(a) Loan Calculator — The Most Common SBA Loan Type

What Is an SBA 7(a) Loan?

An SBA 7(a) loan calculator estimates payment, total cost, and guarantee fee for the SBA’s primary program. The 7(a) is the most flexible and widely used SBA loan type — maximum loan amount: $5 million. The SBA guarantees 85% of loans up to $150,000 and 75% of loans above $150,000 — meaning if you default, the SBA pays the lender that percentage, reducing lender risk and enabling longer terms and lower down payments than conventional business loans.

SBA 7(a) Standard vs Express — Key Differences

7(a) Standard

Maximum loan: $5 million. Full SBA review and approval required — processing time: 5–10 business days for SBA’s portion, longer for lender underwriting. Lower rates than Express. Best for larger loans where rate matters more than speed.

7(a) Express

Maximum loan: $500,000. The SBA 7(a) Express program allows lenders to handle approval without SBA review — decision in 36 hours or less. Slightly higher rates than Standard due to lender taking on more risk without full SBA review. Best for urgent needs or smaller amounts under $350K where the rate premium is offset by speed.

SBA 7(a) Loan Calculator — Guarantee Fee Explained

The SBA guarantee fee is the fee paid to the SBA for guaranteeing a portion of your loan. It is typically financed into the loan (added to the balance) rather than paid upfront. SBA’s 2026 guarantee fee schedule:

Loans up to $150,000: 0% (waived by SBA for 2026)
Loans $150,001–$700,000: 3% of the guaranteed portion
Loans $700,001–$1,000,000: 3.5% of the guaranteed portion
Loans over $1,000,000: 3.5% on the first $1M guaranteed portion + 3.75% on the remainder

On a $250,000 7(a) loan with 75% SBA guarantee: guaranteed portion = $187,500. Fee at 3% = $5,625. This $5,625 is typically added to your loan balance and financed over the loan term — it appears in your total loan cost but not your stated rate. The calculator adds it to True APR automatically.

When SBA 7(a) Beats a Conventional Business Loan

SBA 7(a) wins when: your business lacks the 20–30% down payment required for a conventional commercial loan; you need a term longer than 5–7 years to make the payment affordable; your revenue history is solid but brief (2–3 years); or you’re acquiring a business where the SBA’s favorable acquisition financing terms apply. The calculator’s comparison table shows the total cost difference so the tradeoff is explicit.

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SBA 504 Loan Calculator — Real Estate and Equipment Financing

What Is an SBA 504 Loan?

An SBA 504 loan is a commercial real estate and heavy equipment financing program with a unique structure: 50% from a conventional lender (bank or credit union), 40% from an SBA Certified Development Company (CDC), and 10% from the borrower as down payment. This structure allows businesses to acquire commercial real estate with only 10% down versus 20–30% for conventional commercial mortgages.

SBA 504 Loan Structure and Payment Calculation

The 504 payment has two components — the bank portion and the CDC/SBA debenture portion — each at different rates and terms. The bank portion typically runs at market commercial rates (6%–10% variable). The CDC debenture is fixed rate, currently around 6%–7% for 2026 for 25-year term debentures. The tool blends these into a single estimated monthly payment.

SBA 504 vs 7(a) — Which to Use for Real Estate

SBA 504: Fixed rate on the CDC portion, 10% down payment, maximum project size up to $20 million (SBA portion up to $5.5M), only for real estate and major equipment. SBA 7(a): Variable rate typically, 10–20% down, maximum $5M, flexible use including real estate, working capital, acquisition. For pure commercial real estate purchase, 504 is usually preferred for the fixed-rate certainty on the larger CDC portion.

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The SBA Guarantee Fee — What Most Calculators Don’t Include

Why Missing the Guarantee Fee Distorts Your Cost Estimate

When you calculate an SBA loan payment using most online calculators — including Bankrate’s business loan calculator and NerdWallet’s SBA estimates — the guarantee fee is absent. This makes the SBA loan appear cheaper than it actually is on total cost.

On a $500,000 SBA 7(a) loan: guaranteed portion = $375,000. Guarantee fee at 3% = $11,250. Financed over 10 years at 12.75%, that $11,250 in added balance costs approximately $7,900 more in total interest — bringing the real total cost difference versus the stated rate to over $19,000.

How the Guarantee Fee Affects Your True APR

True APR on an SBA loan = the interest rate that makes the present value of all payments equal to the net loan proceeds you actually receive. When the guarantee fee is financed into the loan (added to balance), your net proceeds equal your loan amount but you owe more — so the fee-adjusted APR is higher than the stated rate. The tool calculates this automatically.

The Lender Fee — What It Is and What’s Normal

In addition to the SBA guarantee fee, lenders charge their own fee — typically 0.5%–2% of the loan amount for SBA loans. On $250,000, a 1% lender fee is $2,500. Some lenders charge higher fees for smaller loans (where underwriting cost is proportionally larger relative to loan revenue). The disclaimer box on the tool notes the typical range so you know whether your lender’s fee is within market norms.

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SBA Loan Eligibility Calculator — Quick Pre-Screen

SBA Basic Eligibility Requirements

The SBA doesn’t approve loans directly — it sets eligibility criteria that participating lenders apply. Core requirements for SBA 7(a) and 504:

Business Requirements

The business must be for-profit, operate in the United States, and be small by SBA size standards (varies by industry — most service businesses qualify up to $8M annual revenue; manufacturers up to 500 employees). The business must have exhausted other financing options — SBA loans are available when conventional financing is not accessible on reasonable terms, not simply as a cheaper alternative.

Credit Score — 650 Minimum, 680+ Preferred

SBA doesn’t set a hard credit score floor, but most participating lenders require a minimum FICO of 650, with 680+ strongly preferred for competitive rates. Below 650, approval is possible but rare and typically requires additional collateral. The eligibility quick-check flags if your entered score is below these thresholds.

Years in Business — 2+ Years Preferred

Two or more years of business history is the standard expectation. Startups (under 2 years) face significantly higher scrutiny and typically require strong personal credit (720+), personal collateral, and an industry-specific business plan. The SBA Microloan program is more accessible for early-stage businesses.

Annual Revenue — Sufficient to Cover Debt Service

Lenders calculate your Debt Service Coverage Ratio (DSCR) — your annual net operating income divided by annual debt payments including the new SBA loan. SBA lenders typically require DSCR of 1.25 or higher. At $360,000 annual revenue (the tool’s reference threshold), a $250,000 SBA loan at $4,514/month requires approximately $54,168 in annual debt service — feasible if net operating income exceeds $67,700.

SBA Microloan Calculator

SBA Microloans are administered through nonprofit intermediary lenders. Maximum loan: $50,000. Average loan: approximately $13,000–$15,000. Terms up to 6 years. Rates: typically 8%–13% depending on the intermediary. Microloans are specifically designed for startups, early-stage businesses, and businesses that don’t qualify for conventional SBA 7(a) loans. The calculator’s Microloan option reflects these shorter terms and adjusted rate ranges.

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SBA Loan Amortization Calculator — How Your Balance Decreases Over Time

How SBA Loan Interest Is Calculated Monthly

SBA 7(a) variable rate loans use simple interest calculated on the outstanding balance monthly. Monthly interest = (Outstanding Balance × Annual Rate) ÷ 12. On a $250,000 loan at 12.75%: first month interest = ($250,000 × 0.1275) ÷ 12 = $2,656. Your $4,514 payment covers $2,656 in interest and $1,858 in principal. As the balance decreases each month, the interest component falls and more goes to principal — standard amortization.

Variable Rate Recalculation Risk

Because most SBA 7(a) loans are variable rate (Prime + spread), your payment changes when the Prime Rate changes. The Federal Reserve adjusts the federal funds rate periodically, which moves Prime directly. A 1% Prime Rate increase on a $250,000, 10-year SBA loan raises your monthly payment by approximately $133. The tool calculates at the current 2026 Prime Rate of 6.75% — your actual payments may differ if Prime moves during your loan term.

SBA Loan Repayment Calculator — Total Cost Over Loan Life

On a $250,000 SBA 7(a) loan at 12.75% variable over 7 years: monthly payment $4,514, total interest $129,183, SBA guarantee fee $5,625, lender fee (1%) $2,500, total cost $387,308. The same loan over 10 years: monthly payment $3,717, total interest $195,740, total cost $453,865. The $803/month payment reduction costs $66,557 in additional interest over 3 extra years. The tool shows this math in the results panel.

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Real SBA Loan Scenarios With Actual Numbers

Scenario 1: Working Capital — Restaurant Expansion

Maria owns a restaurant generating $680,000 annual revenue. She needs $180,000 to open a second location — kitchen equipment, build-out, and 3 months operating capital. She has 680 credit score, 4 years in business.

SBA 7(a) Standard, $180,000 at 12.75% variable, 7 years. Monthly: $3,293. SBA guarantee fee (3% of 75% guaranteed): $4,050. Lender fee (1%): $1,800. True APR: 14.1%. Total loan cost: $276,612. Conventional business loan at 9.5%, 5 years: $3,786/month, total cost: $227,160 — but requires $45,000 down payment (25%) she doesn’t have.

Verdict: SBA wins for Maria — she qualifies, preserves cash, and the longer term keeps payments manageable while the business scales.

Scenario 2: Commercial Real Estate — SBA 504

David’s manufacturing company has $2.1M annual revenue. He wants to buy a $1.2M commercial building rather than continue renting $12,000/month. His lease is up in 14 months.

SBA 504: $600,000 bank portion + $480,000 CDC debenture + $120,000 (10% down). Bank portion at 7.5%, 25yr: $4,426/month. CDC debenture at 6.8% fixed, 25yr: $3,291/month. Total monthly: $7,717. Current rent: $12,000/month. Monthly savings: $4,283. The building appreciation is his — not a landlord’s.

Verdict: SBA 504 saves $4,283/month versus leasing and builds equity in a business asset. Payoff in 25 years; property owned free and clear.

Scenario 3: SBA vs Conventional — The True Cost Comparison

James needs $400,000 for equipment acquisition. His bank offers a conventional business loan at 9.5%, 5-year term. His SBA lender offers 7(a) at 12.0% variable, 10-year term.

Conventional: $8,388/month, total cost $503,280, requires 20% down ($80,000 James doesn’t have liquid).
SBA 7(a): $4,829/month, SBA guarantee fee $10,500, lender fee $4,000, total cost $590,480, 10% down ($40,000).

SBA costs $87,200 more total. But James preserves $40,000 in cash and cuts his monthly payment by $3,559 — cash that goes back into operations.

Verdict: SBA isn’t cheaper — it’s more accessible. The comparison table shows exactly how much the accessibility premium costs.

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Should I Get an SBA Loan? — Decision Framework

Get an SBA Loan If:

Your business needs a longer term than conventional lenders offer (10–25 years versus 3–7 years). You lack the 20–30% down payment required for conventional commercial loans. Your revenue history is strong but brief (2–3 years). You’re acquiring a business and need favorable acquisition financing terms. Your credit is solid (680+) but not stellar — SBA lenders are more flexible than conventional.

Consider Conventional Business Financing First If:

You have 20–30% down payment available. Your loan amount is under $150,000 — the guarantee fee is waived but SBA processing still adds time. You need funds in under 2 weeks — SBA processing takes longer than conventional. Your revenue is well above debt service requirements and you can negotiate competitive conventional terms directly.

What Is a Good Interest Rate for an SBA Loan in 2026?

A good SBA 7(a) variable rate in 2026 is Prime + 2.5% to Prime + 4% for loans over $350,000 — putting the effective rate at 9.25%–10.75%. For smaller loans under $250,000, Prime + 5.5% to Prime + 6% is typical, yielding 12.25%–12.75%. If you’re quoted above these ranges, shop at least two additional SBA-approved lenders.

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Frequently Asked Questions

What is an SBA loan calculator?

An SBA loan calculator estimates your monthly payment, total interest, SBA guarantee fee, true APR, and payoff date for SBA 7(a), 504, or Microloan programs based on your loan amount, rate, term, and loan purpose. A complete calculator also compares SBA loan cost against conventional business loan financing.

How is the SBA guarantee fee calculated?

The SBA guarantee fee is calculated on the guaranteed portion of your loan — not the full loan amount. For loans over $150,000, SBA guarantees 75% of the loan. The fee is 3% for loans between $150,001–$700,000 and 3.5% for loans $700,001–$1,000,000, with additional tiers above $1M. This calculator applies these tiers automatically based on your entered loan amount.

What is the current SBA 7(a) interest rate in 2026?

SBA 7(a) variable rates in 2026 are tied to the Prime Rate (currently 6.75%) plus a lender-set spread. For loans $50,000–$250,000, the maximum spread is 6%, making the maximum variable rate 12.75%. For loans over $350,000, the maximum spread is 3%, capping the rate at 9.75%. Fixed rate SBA loans are also available and typically run slightly higher than the variable equivalent at origination.

What credit score do I need for an SBA loan?

Most SBA-approved lenders require a minimum credit score of 650, with 680+ strongly preferred for competitive rates and streamlined approval. Below 650, approval is possible for borrowers with strong collateral and revenue but is uncommon. The SBA itself doesn’t set a hard credit score requirement — individual lenders apply their own overlays within SBA guidelines.

How long does SBA loan approval take?

SBA 7(a) Standard loans typically take 30–90 days from application to funding — lender underwriting plus SBA review. SBA 7(a) Express loans are approved within 36 hours by the lender (no SBA review required), with funding in 7–30 days. SBA 504 loans often take 60–90 days due to the two-lender structure. If speed is critical, the Express program or conventional financing may be more appropriate.

Can I use an SBA loan for real estate?

Yes. SBA 7(a) loans can finance commercial real estate purchase or construction up to $5 million with a 25-year term. SBA 504 loans are specifically designed for commercial real estate and heavy equipment — with a 10% down payment, bank portion (50%), and CDC debenture portion (40%) that typically carries a fixed rate. For real estate over $1M, SBA 504 is generally the preferred structure.

What is the SBA 504 loan vs SBA 7(a)?

SBA 504: Real estate and major equipment only, 10% down, fixed rate on the CDC portion, up to $5.5M SBA portion, used for owner-occupied commercial real estate and large equipment. SBA 7(a): Flexible use (working capital, equipment, real estate, acquisition, debt refinance), variable rate typically, up to $5M total, any SBA-eligible business purpose. For pure real estate, 504 is usually preferred. For flexibility, 7(a) wins.

Does the SBA loan calculator include the guarantee fee?

Yes — this calculator auto-calculates the SBA guarantee fee based on your loan amount and adds it to the True APR calculation. Most online SBA loan calculators do not include the guarantee fee, which understates your true borrowing cost by thousands of dollars on larger loans.

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Data Sources

Accuracy & Verification

SBA interest rate caps and guarantee fee schedules are based on SBA Standard Operating Procedure 50 10 7 (SOP 50 10 7) and SBA Notice 5000-846620. Prime Rate (6.75%) sourced from the Wall Street Journal Prime Rate as of April 2026. SBA 504 debenture rates from NADCO (National Association of Development Companies) April 2026 debenture sale data. Eligibility thresholds reflect SBA’s published 7(a) program eligibility requirements. Last verified: April 2026.

This tool provides estimates for informational purposes only. SBA guarantee fees, rates, and terms are subject to SBA program updates. Actual rates, fees, and approval depend on your lender, credit profile, business financials, and SBA program requirements. Consult an SBA-approved lender for official loan terms and eligibility determination.

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Related Calculators

Tools That Connect to This One

If you’re evaluating whether an SBA loan makes financial sense for your business, the break-even calculator shows exactly how many units or revenue dollars you need to cover your new monthly debt service — before you sign anything.

For business owners buying commercial property through SBA 504, the commercial mortgage calculator models your blended payment, DSCR, and balloon payment across Bank, SBA 504, CMBS, and Bridge loan structures side by side.

And to see how this loan obligation affects your business’s overall financial position — assets versus liabilities — the net worth calculator maps everything in one view.

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