Interest
The cost of borrowing money, calculated as a percentage of principal; in contracts, interest provisions set the rate, accrual method, compounding, and default penalties.
While straightforward in theory, many businesses fail to actively track obligations tied to this concept - often resulting in missed deadlines, unintended renewals, penalties, or loss of contractual rights.
US Law · For business owners and foundersWhat is a Interest?
Interest is the cost of borrowing money, typically expressed as an annual percentage of the borrowed amount (principal). In contracts involving loans, credit, payment terms, or any delayed payment of money, interest clauses specify the interest rate, how it is calculated, when it accrues, when it must be paid, and what happens if payment is late.
Interest clauses are critical in commercial contracts because they define the true cost of credit to the borrower and the return to the lender. A 5% interest rate looks different if interest is simple (calculated only on principal) versus compound (calculated on principal plus accrued interest). A default interest rate - a higher rate triggered by late payment - incentivizes timely payment and compensates the lender for additional risk.
In practice, many teams rely on a contract expiry tracking system to stay on top of dates and obligations tied to clauses like this.
Key Elements
Interest Rate
The percentage of principal charged annually. A 6% interest rate on a $100,000 loan means $6,000 per year in interest. Rates can be fixed (same rate throughout the loan term) or floating (adjusted periodically based on a benchmark like SOFR or prime rate).Accrual Method
How interest is calculated. Simple interest is calculated only on the principal amount: 5% of $100,000 = $5,000 per year. Compound interest is calculated on principal plus accrued interest. If interest compounds monthly, you earn "interest on interest." Compound interest is more expensive for borrowers.Accrual Period
When interest accrues - annually, quarterly, monthly, or daily. Daily accrual means interest starts building immediately and is more expensive than annual accrual. Most consumer and commercial loans accrue daily or monthly.Default or Late Payment Interest
Many contracts specify a higher interest rate that applies if a payment is late. For example, the base interest rate might be 4%, but if payment is 15+ days late, the rate jumps to 10%. Default interest incentivizes on-time payment and compensates the lender for the risk of non-payment.Usury Limits
Most states impose a maximum interest rate (usury ceiling) that lenders cannot legally charge. Exceeding the usury limit can make the interest unenforceable or void the entire loan. Federal lenders (banks, credit unions) have different limits than non-bank lenders.Real-World Example
SmallCo borrows $50,000 from a business lender at 8% annual interest, simple interest, payable monthly in arrears. The loan term is 3 years. If payment is more than 5 days late, the rate increases to 12%. SmallCo misses a payment in month 8.
SmallCo's monthly interest cost under the 8% rate is approximately $333 (8% ÷ 12 × $50,000). When the payment is late, the interest rate jumps to 12%, so the new monthly rate is ~$500. The late payment clause incentivizes SmallCo to catch up quickly. If the loan is in a state with a usury ceiling of 10%, the 12% default rate would be unenforceable, and interest would cap at 10%.
This is why many businesses adopt automated deadline tracking to ensure no critical dates are missed before they pass.
Sample Clause Language
Interest Rate and Default Interest ProvisionWatch Out For
Accepting a floating interest rate without a cap or floor
If interest is tied to SOFR or prime rate with no cap (ceiling), a spike in benchmark rates could dramatically increase your borrowing costs. Always negotiate a cap on floating rates and, if possible, a floor. For example: "Rate = SOFR + 2%, but not less than 3% and not more than 10%."Ignoring state usury laws
Interest rates that exceed your state's usury ceiling may be unenforceable. Federal lenders (national banks) are exempt from state usury laws, but non-bank lenders are not. If you are borrowing from a non-bank lender, verify the interest rate is within your state's legal limit.Not understanding compound vs. simple interest
Compound interest is significantly more expensive than simple interest over time. A loan described as "8% compound quarterly" is more expensive than "8% simple interest." Always confirm the accrual method and calculate the true cost before accepting.Don't let interest deadlines catch you off guard
Key dates tied to interests - renewal windows, expiry cutoffs, notice periods - can easily slip through the cracks when tracked manually. Missing them triggers automatic extensions, penalties, or lost rights. ExpiryEdge tracks every critical deadline and sends automated reminders before they're due - so nothing slips.
Instead of relying on spreadsheets or manual follow-ups, a centralized renewal reminder system ensures every deadline is visible, tracked, and actioned automatically.
How to Use This in Your Favor
Negotiate the lowest rate and the smallest default interest premium
Interest rates are often negotiable, especially for commercial loans and vendor financing. A 0.5% reduction on a $1M loan saves $5,000 per year. For default interest, push for the smallest premium necessary to cover the lender's cost of collection - often 2-4 percentage points above the base rate.Include an early repayment provision with no prepayment penalty
If you may want to pay off a loan early, negotiate a clause allowing prepayment without penalty. This preserves your option to save interest costs if rates drop or your business cash flow improves.Specify daily accrual and monthly payment to minimize cost
Daily accrual with monthly payment is standard and reasonable. Avoid contracts requiring higher-frequency accrual (hourly) or compounds that reinvest accrued interest automatically.Related Terms
Frequently Asked Questions
What is the difference between APR and APY?
APR (Annual Percentage Rate) is the nominal rate stated in the contract, typically calculated on principal only (simple interest). APY (Annual Percentage Yield) accounts for the effect of compounding and shows the true cost of borrowing. A loan with 8% APR and monthly compounding will have an APY higher than 8%. Always ask for the APY to understand true cost.
Can interest be charged on accrued interest?
Yes, if the contract provides for compound interest. Compound interest calculates interest on both the original principal and all previously accrued interest. This is more expensive for the borrower but is standard in many loan agreements. Simple interest charges interest only on the original principal.
Is it legal to charge interest on late payments?
Yes, in most states. Lenders regularly charge a higher default interest rate on late payments to incentivize on-time payment. However, the rate must comply with your state's usury ceiling. Some contracts also allow penalties beyond interest, such as late fees.