Business Loan Calculator for US Businesses

A US business loan calculator uses the standard amortisation formula to compute monthly repayments and total interest cost at prevailing 2026 US small business lending rates. With the Federal Funds rate sitting in the 4-5% range and Prime tracking at roughly 7-8%, the all-in cost of US SMB borrowing in 2026 spans a wide arc — from 7-10% on conventional bank term loans to 15-30% APR on alternative lenders. The SBA.gov website, Federal Reserve Senior Loan Officer Opinion Survey, and NFIB Small Business Economic Trends report are the authoritative sources for current US small business lending benchmarks.

US small business borrowing in 2026 has settled into a five-product market that this calculator handles cleanly:

1. SBA-7(a) — the workhorse of US small business lending - Up to $5 million principal, 10-year working capital / 25-year real estate amortisation - Pricing: Prime + 3.0% to 6.5% (tiered by loan size); larger loans get the lower spread - Typical 2026 all-in APR: 9-12% with Prime at ~7-8% - SBA guarantee: 75% on loans above $150k, 85% on loans below $150k - Use of funds: working capital, equipment, owner-occupied real estate, business acquisition, refinance

2. SBA-504 — fixed-asset and real-estate financing - Up to $5.5 million ($5M project portion, plus the lender's first-mortgage portion can push total to $20M+) - Structure: 50% bank first mortgage, 40% CDC/SBA debenture at sub-market fixed rate, 10% borrower equity - Pricing: 504 debenture portion ~6% fixed (2026 Treasury-plus), bank first mortgage at market - 10, 20, or 25-year amortisation

3. Conventional term loan - $50k-$10M+ - Pricing 7-10% APR for established borrowers with collateral - 3-7 year typical term - Bank or credit union, often relationship-based

4. Business line of credit - Revolving, $10k-$1M typical - Prime + 1.5% to 5% on drawn balances - Often interest-only during draw period

5. Alternative lenders (OnDeck, Bluevine, Funding Circle, Kabbage, Fundbox) - $5k-$500k - 15-30% APR effective on short-term and 6-18% on medium-term - Faster decisions (24-72 hours) but materially higher cost

Worked example — SBA-7(a): A US small business takes a $100,000 SBA-7(a) loan at 10% APR over 10 years to fund a build-out. Using M = P × [r(1+r)^n] / [(1+r)^n − 1] with r = 0.10/12 = 0.008333 and n = 120, the monthly payment is $1,321.51. Total paid over 120 months = $158,581. Of that, $100,000 is principal and $58,581 is interest — about 59% of the original principal paid in interest over the term.

The personal-guarantee reality: almost every US SBA loan requires personal guarantees from owners holding 20% or more equity. Most conventional small business loans also require personal guarantees until the business has substantial standalone credit history. This means SMB borrowing in the US is, in practice, secured by the owner's home and personal assets in most cases — the calculator's monthly payment is the public number, but the personal-asset exposure is the private one.

Origination and SBA guarantee fees: conventional lenders charge 0-5% origination fees that should be added to the principal when modelling true cost. SBA-7(a) borrowers also pay an upfront guarantee fee, tiered by loan size: 0% on loans up to $1M during current SBA fee-waiver windows, 0.55% on $1M-$1.5M, 0.75% on $1.5M-$2M, and 0.85% on $2M-$5M (check current SBA fee notices, as these are revised). On a $100k SBA-7(a) the guarantee fee under the current waiver is $0; on a $2.5M loan, roughly $20,000.

For authoritative current data, the SBA.gov SOP 50 10 7 sets the underwriting and pricing rules for 7(a) and 504 loans, the Federal Reserve's H.15 release publishes Prime daily, the Senior Loan Officer Opinion Survey tracks tightening or easing in SMB credit standards quarterly, and the NFIB Small Business Economic Trends survey publishes monthly SMB borrowing-needs data. Pair this calculator with /roi-calculator/us to test whether the debt-funded project actually pays off and /cash-flow-calculator/us to confirm the monthly payment fits projected cash flow.