Illinois Installment Loan Calculator: Payment, Total Cost, APR

When a bill outgrows a single paycheck, credit is priced in APR and repaid in equal monthly installments, and this calculator models that structure. Enter three inputs: amount, APR, and term in months. Each payment follows the standard amortization formula, while the sum of all payments and the interest within them reveal the full cost of the borrowing.

The defaults double as a worked example: $1,300 borrowed at 136% APR, repaid across six months, means a $305.82 monthly payment, $1,834.92 paid overall, and $534.92 of that is interest. Reset the APR to the state’s 36% cap and the payment slides to about $236.01 on $1,416.06 total. Identical principal, identical term: the APR alone produces the gap, and judging offers by monthly payment alone is how borrowers end up overpaying.

Two honest caveats: the tool presumes a fixed rate and no origination fee, and it prices the figures you type rather than whatever the lender bundles into the contract. Use the output as your baseline, then read the lender’s own contract carefully before signing. Illinois licenses consumer finance lenders through the Department of Financial and Professional Regulation, and those licenses carry the 36% APR cap.