Business Line of Credit Interest Calculator

Calculate your monthly interest and facility fee costs on a business line of credit. See how costs change at different utilisation levels and compare against a term loan.

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Enter your facility details

$
$10,000$1,000,000
$
$0$100,000
%
%
Monthly interest cost
$333.33

on $50,000 drawn (50% utilisation)

Monthly facility fee
$83.33
1% p.a. on $100,000
Total monthly cost
$416.67
Interest + facility fee
Total annual cost
$5,000
$4,000 interest + $1,000 fee

Cost at different utilisation levels

UtilisationDrawnMonthly interestMonthly feeTotal / month
25% drawn$25,000$166.67$83.33$250.00
50% drawn(current)$50,000$333.33$83.33$416.67
75% drawn$75,000$500.00$83.33$583.33
100% drawn$100,000$666.67$83.33$750.00

Line of credit vs term loan comparison

Comparing the monthly cost of your current LOC draw ($50,000) against a 5-year term loan for the same amount at 8% p.a.

StructureMonthly costIncludes principal?Flexibility
Line of credit$416.67NoDraw and repay freely
Term loan (5yr)$1,013.82Yes — paid off in 5 yearsFixed schedule

Your LOC costs $597.15/month less than a term loan — but with no principal repayment, the balance remains. A LOC is best for short-term or variable needs.

What your scenarios reveal

Low utilisation (25%)

Drawing only 25% of your facility keeps monthly interest low while maintaining headroom for unexpected expenses. The facility fee is the same regardless, so your cost per dollar drawn is higher at low utilisation.

Typical usage (50%)

Many businesses maintain around 50% utilisation, balancing available headroom with the cost of carrying an unused facility. This level gives a realistic picture of ongoing monthly costs.

High utilisation (75%)

At 75% drawn, the interest cost dominates your total monthly expense. If you are consistently above 75%, a term loan for the base amount with a smaller LOC on top may be cheaper.

Fully drawn

Drawing the full facility means paying interest on the entire limit plus the facility fee. At this point, compare the total cost against a term loan — the term loan includes principal repayment but may have a lower total cost of funds.

How a business line of credit works

Interest on drawn balance only

You only pay interest on the funds you actually draw from the facility, not on the total approved limit. This makes a LOC cost-effective when utilisation fluctuates.

Facility fee on the full limit

Most lenders charge an annual facility fee on the entire approved limit — whether you draw $0 or the full amount. This is the cost of having the facility available.

Revolving access

As you repay drawn funds, those funds become available to draw again. Unlike a term loan, there is no fixed repayment schedule — you manage the balance.

Review and renewal

Most facilities are reviewed annually. The lender may adjust the limit, rate, or terms based on your business performance. Some facilities are on-demand (callable at any time).

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Frequently asked questions

Results are estimates only and should not be relied upon for financial decisions. Actual line of credit repayments will depend on the lender, your credit profile, and the specific terms offered. Interest rates used are for illustration purposes only and may not reflect current market rates.

Subject to lender approval, terms and conditions apply.

This calculator is general information only and is not financial advice.