Business overdraft calculator: see your weekly repayment cost in seconds.
Enter your facility size, how much you plan to draw and your preferred term. Instantly see your weekly repayment, monthly cost and total interest for a business overdraft in Australia.
Business overdraft interest works differently to a loan: it is charged only on the balance you have drawn, not the full approved limit. Set the interest rate slider below (panel range 14.55% to 25% p.a., as at September 2026) and the calculator works out interest on your drawn balance, adds the weekly line fee on the full limit, and shows your true weekly cost. The undrawn portion of the facility never accrues interest - only the line fee.
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Written and reviewed by John Pierre Saliba, Director and Senior Finance Broker, MFAA Accredited. Last reviewed 18 September 2026.
Overdraft Repayment Calculator
Free. No sign-up required. Instant results.
Interest-only: what the facility costs per week while the balance is held constant.
$50,000
Total approved overdraft limit ($10,000 to $500,000)
60% ($30,000)
Percentage of the facility you expect to use
18.00% p.a.
Indicative panel range 14.55% to 25% p.a. - your rate depends on credit assessment
How long you expect to hold the facility
Your overdraft cost breakdown
Weekly cost
$126
Interest on drawn balance + line fee
Monthly cost
$549
Interest + line fee per month
Annual cost
$6,596
Interest-only, balance held constant
Component
Calculation
Amount
Drawn balance
$50,000 x 60%
$30,000
Weekly interest (18% p.a.)
$30,000 x 18% / 52
$103
Weekly line fee (0.046%/wk)
$50,000 x 0.046%
$23
Weekly cost to hold
Interest + line fee
$126
Indicative only. Rates start from 14.55% p.a. and are subject to change based on credit assessment, business profile, revenue, trading history and lender criteria. "Repay over term" assumes no redraws: it pays the drawn balance to zero on a declining-balance schedule - in practice you can redraw as you repay, which changes the interest you pay.
Get a real quote based on your numbers
Your indicative cost is above. Enter your details below and a broker will provide an actual quote from our panel of 50+ lenders. Free, no obligation, no credit check.
This calculator uses the standard pricing model for unsecured business overdrafts offered by non-bank lenders in Australia. There are two cost components: interest on your drawn balance and a line fee on the full facility limit. Rates start from 14.55% p.a. and are indicative only - actual pricing is subject to change and depends on your credit assessment, business profile, revenue, trading history and lender criteria.
Total interest = drawn balance x 14.55% x yearsTotal line fee = facility limit x 0.046% x (years x 52 weeks)Total cost = drawn balance + total interest + total line feeWeekly cost = total cost / (years x 52)Monthly cost = weekly cost x 52 / 12
Worked example: $50,000 facility at 60% drawn over 3 years
Facility limit: $50,000. Drawn balance: $30,000 (60% of $50,000). Term: 3 years (156 weeks).
Interest: $30,000 x 14.55% x 3 = $13,095. Line fee: $50,000 x 0.046% x 156 = $3,588. Total cost: $30,000 + $13,095 + $3,588 = $46,683. Weekly: $46,683 / 156 = $299. Monthly: $299 x 52 / 12 = $1,296.
Worked examples at a glance
All examples below assume 60% drawn over a 3-year term.
The fair comparison is the same funding need. Here is $30,000 borrowed for 3 years at the same indicative 18% p.a., both repaid on a declining-balance schedule.
$30,000 funding need, 3 year term, 18% p.a. both products - as at September 2026
Feature
Business overdraft ($30K limit, fully drawn)
Term loan ($30K)
Amount borrowed
$30,000
$30,000
Weekly repayment
About $263 ($249 + $14 line fee)
About $249
Total interest
About $8,875
About $8,875
Line fee over term
About $2,153 (0.046%/week on the limit)
None
Total cost of credit
About $11,028
About $8,875
Redraw as you repay
Yes - repaid funds become available again
No - reapply for new funds
Early repayment
No penalty
May incur break costs
At the same rate and funding need, the term loan is cheaper on paper - the difference is the overdraft's line fee, which is the price of redraw flexibility. The overdraft wins when your need is intermittent: hold only what you use and the interest-only cost of an undrawn facility is just the line fee. Both columns use an indicative 18% p.a. on a declining balance - actual rates are subject to change and vary with credit assessment and business profile.
These numbers are indicative. Your real quote takes 2 minutes.
One application, one credit enquiry, 50+ lenders compared. Free broker service - the lender pays us, never you. ACL 511092.
Weekly cost to hold: interest-only on 60% drawn, line fee on the full limit, balance held constant - as at September 2026
Facility limit
At 14.55% p.a.
At 18% p.a.
At 25% p.a.
$25,000
$53/week
$63/week
$83/week
$50,000
$106/week
$126/week
$167/week
$100,000
$213/week
$253/week
$334/week
$250,000
$534/week
$634/week
$836/week
$500,000
$1,069/week
$1,268/week
$1,672/week
Assumptions: 60% of the facility drawn and held constant (interest-only view), interest charged on the drawn balance, line fee of 0.046% per week on the full limit. Repaying the balance down is extra - use the "Repay over term" view in the calculator above for a declining-balance schedule. Indicative only; actual rates and fees depend on credit assessment, business profile and lender criteria. Facilities over $150,000 are assessed case by case. See what limit your revenue supports with how much can I borrow, or read the unsecured business overdraft guide.
Frequently asked questions
How is business overdraft interest calculated?
Interest is calculated only on the drawn (used) portion of your overdraft facility, at an indicative rate of 14.55% to 25% p.a. depending on your profile. If your facility is $100,000 but you only draw $60,000, you pay interest on $60,000 only. The unused portion incurs no interest.
What is a line fee?
A line fee is a small weekly charge applied to the full approved facility limit, regardless of how much you have drawn. It is typically 0.046% per week (approximately 2.4% per annum). This fee covers the lender's cost of keeping the facility available to you.
How much does a $100,000 business overdraft cost per week?
Holding $60,000 drawn on a $100,000 facility costs approximately $253 per week at 18% p.a. ($213 at 14.55% p.a.) - interest on the drawn balance plus a line fee of 0.046% per week on the full facility, with the balance held constant. Repaying the balance down over a term adds the principal on top: use the "Repay over term" view in the calculator for that schedule.
Do I pay interest on the full limit?
No. Interest applies only to the balance you have actually drawn. The full approved limit attracts only the line fee. That is the structural advantage of an overdraft over a term loan: money on standby costs a fraction of money borrowed.
What does a $50,000 overdraft cost per week?
Holding $30,000 drawn on a $50,000 facility costs approximately $126 per week at 18% p.a. ($106 at 14.55% p.a.) - interest on the drawn balance plus a line fee of 0.046% per week on the full $50,000 facility, balance held constant. Repaying the balance to zero over 3 years costs about $195 per week at 18% p.a. including principal.
Is the rate flat or reducing balance?
Business overdraft rates are typically quoted as a flat rate applied to the drawn balance. The rate you set in this calculator (14.55% to 25% p.a.) is applied flat to whatever amount you have drawn at any given time. Unlike a term loan, you can repay and redraw without penalty.
How accurate is this calculator?
This calculator provides an indicative estimate based on typical non-bank overdraft pricing in Australia. Actual rates and fees vary between lenders and depend on your credit profile, revenue and trading history. Use it as a planning guide, then speak with our team for a precise quote from our panel of 50+ lenders.
Do I need tax returns to apply?
No. Non-bank lenders assess your application using 6 months of business bank statements. No tax returns, BAS statements or financial statements are required for unsecured facilities under $150,000.
How fast can I get an overdraft?
Decisions are available from 1 hour with non-bank lenders. Funding lands same day in many cases, typically within 24 to 48 hours of approval. OverdraftMe handles the entire application process, from lender selection to settlement, at no cost to you.
Can I pay the overdraft off early?
Yes. Business overdrafts are revolving facilities with no loan-style repayment schedule (many non-bank lenders set minimum weekly repayments). You can repay the full drawn amount at any time without penalty. Once repaid, the facility remains available to draw on again without reapplying.
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