SBA loan calculator: payments, interest and amortization
Use this SBA loan calculator to estimate monthly payments, interest and fees. Compare SBA 7(a) loans and the bank and CDC portions of a 504 project, then download your amortization schedule for Excel.
Estimate your paymentsSBA programs and eligibilityEstimate your SBA payments
Choose a program, enter your proposed terms and see the repayment schedule. The starting rates are examples. Replace them with your lender’s quote or SBA disaster-loan terms.
Schedule uses monthly periods from the assumed initial disbursement. For 504, each loan portion has its own rows. A payoff amount appears separately from the regular payment.
| Loan portion | Month | Payment | Principal | Interest | Balloon | Fees | Balance |
|---|
How these calculations work
Amortizing loans: the monthly principal-and-interest payment is P × r ÷ [1 − (1 + r)−n], where P is principal, r is the annual nominal rate divided by 12 and n is the number of repayment months. At 0% interest, payment is P ÷ n. Interest is charged on the unpaid principal each month; it is not added to principal when scheduled payments are made.
Variable-rate scenario: one user-selected rate change recalculates the remaining payments. This is a stress test, not a rate forecast or a complete record of future resets.
504: the bank and CDC portions are calculated separately. The bank payment follows its amortization period, while the remaining balance becomes due at its maturity. The displayed initial payment adds both portions and any monthly fee allowance. It does not assume that a future refinance will be available.
Revolving facilities: the model holds one initial draw outstanding during the selected draw period, charging monthly interest. It then repays principal over the selected term-out, or shows principal due at maturity where that structure is permitted. Actual borrowing-base collections, further draws, daily accrual and lender clean-up requirements will change the schedule.
Disaster loans: selected deferred months have no interest and no payment. The remaining principal amortizes over the rest of the total term. This assumes one full disbursement at the start. It is not a COVID EIDL calculator.
Fees and rounding: upfront fees are paid in cash and are not financed or deducted from proceeds. Recurring fees are a constant monthly allowance, charged in repayment months; for 504 they run for the full modeled project period. Results are rounded for display, with full precision used for calculations. Interest plus entered fees is a dollar cost, not an APR. Actual day-count conventions, staged disbursements, rate changes and lender rounding can produce different payments.
Read more about how an amortization schedule works. The calculator does not determine program eligibility, aggregate affiliate exposure, collateral, tax treatment, prepayment penalties or every SBA fee.
How to use the SBA loan payment calculator
- Choose the program. The fields and explanation change with your selection. A 504 project needs separate bank and CDC terms; a revolving facility needs a drawn balance and repayment period.
- Enter proposed terms. Enter the loan amount, annual interest rate and repayment term from your quote. Start with the example values if you want to see how the calculator works.
- Add costs you will pay. Enter quoted fees paid separately at closing. Do not add a fee again if it is already included in the rate you entered. This tool does not automatically calculate SBA guaranty fees.
- Calculate and compare. Read the monthly estimate, then expand the cost breakdown. Check any balloon payment before deciding that the monthly amount fits your budget.
- Save the repayment schedule. View the table or download its CSV file. Change the inputs and calculate again to create a different scenario.
Compare the payment with the cash your business has available after expenses and existing debts. For seasonal businesses, check whether it also fits a slower month.
What would a $100,000 or $250,000 SBA loan cost per month?
At an illustrative 10% annual rate over 10 years, a $100,000 fully amortizing loan has a monthly principal-and-interest payment of about $1,321.51. A $250,000 loan on the same terms is about $3,303.77 per month.
| Loan amount | Monthly payment | Interest across 120 payments |
|---|---|---|
| $100,000 | $1,321.51 | $58,580.88 |
| $250,000 | $3,303.77 | $146,452.21 |
Examples assume a constant rate, monthly payments at month-end and no fees or prepayments. Totals use unrounded payments; a lender’s rounding can change the final payment.
A longer term usually lowers the monthly payment while increasing interest paid over time if the amount and rate stay the same. Compare both the payment and the full cost.
SBA 7(a) loan calculator: principal, rate and term
Choose a 7(a) term-loan option to estimate monthly principal and interest. For a level-payment loan, the payment is P × r ÷ [1 − (1 + r)−n], where P is principal, r is the annual rate divided by 12 and expressed as a decimal, and n is the number of monthly payments. At a zero rate, the payment is P divided by n.
Each month’s interest is based on the remaining principal in this model. The rest of the payment reduces the balance. That is why the interest portion falls as an unchanged-rate loan is repaid. A variable-rate loan can have a different payment after its rate resets; the tool can model one such change.
Use your proposed loan term, rather than choosing the longest term solely for a lower payment. Permitted terms depend on the use of funds. Read our SBA 7(a) guide for financing uses and requirements, and the SBA’s terms and conditions for program guidance.
SBA 504 loan calculator: two loans and your contribution
An SBA 504 project usually combines a bank loan, a Certified Development Company (CDC) loan and your contribution. Enter the project cost, your contribution, the bank’s share and the two loans’ terms separately. The tool calculates the CDC share from what remains.
For example, a $1 million project with a 10% contribution and 50% bank share leaves a $400,000 CDC portion. Using the example inputs of 8% for the $500,000 bank loan amortized over 25 years and 6% for the CDC portion over 25 years produces an initial combined payment of about $6,436.29, before fees.
If that bank loan matures in 10 years, its remaining principal comes due then. A 25-year amortization does not mean the bank has agreed to lend for 25 years. The calculator shows the balloon separately. See our SBA 504 financing guide for the project structure.
Download your SBA loan amortization schedule for Excel
The schedule shows how each modeled payment affects the debt: beginning balance, interest, principal, any balloon and ending balance. For a 504 scenario, it lists the bank and CDC portions separately, so there can be more than one row for a month.
Select View amortization schedule after calculating to see the table. Select Download schedule (CSV) to open your results in Excel or another spreadsheet. The file uses your last calculated results, so calculate again after changing any inputs.
Our amortization schedule explanation walks through principal and interest. Early repayments, actual payment dates, daily accrual and later rate changes can make a lender’s schedule different.
SBA calculator questions
Does the payment estimate include SBA fees?
Only the fees you enter. Closing fees are treated as cash paid separately, not financed into the loan. A recurring monthly fee is a constant allowance. The result’s interest-plus-fees total is a dollar amount, not an APR. Ask the lender for an itemized quote, including any applicable upfront SBA guaranty fee. The lender’s SBA annual service fee cannot be passed to the borrower.
Can I calculate an SBA down payment?
The 504 option calculates your contribution from the project cost and selected percentage. It does not determine all cash needed for closing, reserves or construction. For a 7(a) acquisition or other project, the required contribution depends on the transaction and underwriting. This calculator does not establish that requirement.
Can this calculate how much SBA financing I qualify for?
No. It estimates repayment on an amount you enter. A lender must review repayment ability, eligible use of funds and the applicable program rules. Start with our SBA loan requirements if you are still checking eligibility.
Does it calculate an EIDL award or COVID EIDL payment?
No. The disaster options model repayment assumptions for supported disaster loans, not the amount SBA will approve. The tool is not designed for existing COVID EIDL accounts, hardship arrangements or accrued balances. Use the terms and balance on your SBA account and loan documents for those questions.
Can I use it for PPP forgiveness or payroll calculations?
No. This tool does not calculate PPP borrowing amounts, payroll eligibility or forgiveness. Those searches concern a different program and require different inputs and rules.
Which calculator should I use for a non-SBA business loan?
Use our business loan calculator to compare conventional term-loan payments, fees and repayment structures. The SBA calculator adds program-specific assumptions, including the two loans in a 504 project.
Why does my lender’s payment differ?
Check the note rate, financed fees, exact term and payment timing first. Daily interest, staged disbursements, servicing charges and rounding can also change the result. The calculation-method panel under the tool explains the assumptions for each repayment structure.
Check the numbers before you compare offers
Use the same financing amount and purpose when comparing quotes. Look at cash needed at closing, monthly payments, total interest and fees, and any balance due at maturity. For program limits, documents and the application process, return to our SBA loans guide.
Methodology: this tool uses monthly planning models with user-entered rates and fees. Program information is based on the SBA’s 7(a) guidance and the sources linked in our SBA programs guide. Open the calculation notes in the tool for each model’s assumptions.