Interest Only Business Loans: Evidence and Repayments

An interest-only business loan requires interest payments during an agreed period while the principal remains outstanding. Assess whether the business can pay that interest and repay the principal when the contract requires it. Lower payments during the interest-only period can preserve operating cash, but they leave the business with a later repayment obligation.

For a broker or commercial credit assessor, the repayment schedule and the principal repayment plan must agree. A forecast that covers monthly interest alone doesn’t show whether the business can meet a final lump sum or later principal repayments.

Confirm the Business Purpose and Facility

Record what the business will buy or fund, who will borrow and why the requested interest-only period fits that purpose. Include the loan amount, total term, proposed security and the date interest-only payments end. Name the borrowing company, trustee, partnership or sole trader precisely and separate the borrower from any guarantor or security owner.

A business term loan provides an agreed amount for a defined term. An overdraft or revolving facility allows drawings and repayments within an approved limit, subject to its terms. Paying interest on a drawn balance doesn’t make those facilities interchangeable with an interest-only term loan.

Where a business-purpose loan is secured by commercial property, an interest-only commercial mortgage describes the repayment structure and property security together. The property doesn’t determine when principal must be paid. Keep the repayment assessment here and use the commercial property loan guide for valuation, lease and property-security checks.

Residential investment mortgages have a different purpose and product contract. Use the interest-only investment home loan guide for that assessment. Don’t carry a residential interest-only period or consumer-law assumption into a business facility merely because a home secures the debt.

Explain the Repayment Structure

Interest-only repayments pay the interest due without reducing principal through the scheduled payments. The contract determines whether the business then starts principal and interest repayments or pays the remaining balance in full. Amortisation means repaying principal progressively through instalments.

For a transition to amortisation, show the new payment and the remaining repayment term. The business has fewer instalments left to repay the outstanding principal after an interest-only period. If the contract instead requires full repayment at maturity, enter that amount as a separate cash outflow on its due date.

A bullet loan has its principal due as one final payment. The label alone doesn’t tell you whether interest is paid regularly, deducted upfront or added to the debt. An interest-only loan with regular interest payments and all principal due at maturity can also have a bullet repayment.

Compare the written schedules on these points.

Repayment structure	Interest during the term	Principal obligation
Interest-only, then amortising	Paid on the agreed dates	Paid progressively after the interest-only period
Interest-only, then full repayment	Paid on the agreed dates	Remaining balance due at the specified maturity
Bullet principal with capitalised interest	Added to debt where the contract permits	Principal and accrued unpaid interest due under the final repayment terms
Principal and interest from the start	Included in regular payments	Principal reduces throughout the term

Capitalised interest increases the debt instead of being paid from current cash. Model the resulting balance and any interest charged on that balance under the contract. Never describe a period with capitalised interest as debt staying constant.

Test Cash Flow and the Principal Exit

Reconcile the business forecast with financial accounts and bank statements, then test both the interest payments and the principal repayment date. Use actual receipt timing, operating costs, tax payments, owner drawings and existing debt commitments. Explain why any forecast growth differs from the business’s recent trading results.

The business loan cash-flow forecast guide helps organise the monthly evidence. Include a base forecast and downside cases for lower receipts, delayed customer payments and higher financing costs. A profitable year can still contain a month when cash falls below the amount needed for payments.

A Fictional Interest-Only Business Loan

Assume a business borrows $300,000 for an asset purchase under a fictional 12-month facility. The example assumes monthly interest payments and full principal repayment at month 12. All amounts are Australian dollars, and the 8% annual rate is an illustration, not a current lender quote.

The business starts the forecast with $50,000 cash after the purchase. It receives $30,000 each month, pays $25,000 in operating outgoings and pays $2,000 on existing debt. Operating outgoings include tax and owner drawings for this example.

Monthly interest is $300,000 multiplied by 8%, divided by 12, which equals $2,000. This simplified calculation assumes equal monthly interest periods and excludes loan fees. A real schedule must use the lender’s interest calculation and include all fees.

Scheduled amount	Months 1 to 11, each month	Month 12
Interest payment	$2,000	$2,000
Principal payment	$0	$300,000
Principal still owed after the interest payment, before principal repayment	$300,000	$300,000
Operating cash increase after existing debt and new interest, before any asset sale or principal repayment	$1,000	$1,000

After 12 months, operating cash is $62,000 before the asset sale and principal repayment. The business has paid $24,000 interest and still owes $300,000 principal. Paying interest on time has left the principal unchanged.

Suppose an asset sale is expected to provide $330,000 at maturity, net of sale costs, taxes and any other secured debt. That receipt covers the $300,000 principal, with $30,000 left over. Support the expected sale date and net proceeds with evidence, then model a weaker outcome.

If monthly receipts fall 10% to $27,000 and the illustrative rate rises to 10%, monthly interest becomes $2,500. Cash falls by $2,500 a month, leaving $20,000 after 12 months. A 20% reduction in net sale proceeds leaves $264,000, so principal is short by $36,000.

Even using all $20,000 cash leaves $16,000 unpaid in that combined downside case. It also leaves the business without operating cash. The proposed structure needs an evidenced additional repayment source or a different loan amount or repayment schedule.

Test delayed receipts separately. In the base forecast, moving a $15,000 receipt from month 3 to month 4 reduces month 3 closing cash to $38,000. Month 4 cash returns to $54,000 when the receipt arrives, assuming every other base figure stays unchanged.

For a refinance exit, model a lower new lending amount and the cash contribution needed to repay the existing facility. For example, a hypothetical $270,000 refinance against $300,000 outstanding leaves $30,000 to fund, before refinancing costs. Treat refinancing as dependent on a new credit decision and the business’s position at that time.

An asset sale delayed beyond maturity creates a repayment problem even if the eventual sale price is enough. Record a funded alternative that covers the due date. An assumed extension isn’t a repayment source.

Compare Lender Conditions

Compare lender offers using the same business purpose, amount, security and forecast. Separate published product choices from the terms approved for that applicant. The signed offer must identify the actual interest-only end date and what happens next.

As at October 2026, National Australia Bank (NAB) lists interest-only and principal and interest repayments for its Business Options Loan. It also permits a combination of those repayment structures. Its page describes full repayment after interest-only and structures that switch to principal and interest.

The applicant’s offer determines which schedule applies. Record that schedule before assessing the principal repayment plan.

NAB permits additional repayments on its variable-rate option. Redraw requires its agreement. Its fixed-rate description excludes extra repayments and redraw during the fixed period, so a proposed voluntary principal reduction must fit the approved rate structure.

Westpac’s business loan application guide, as at October 2026, lists interest-only or principal and interest repayments for its variable-rate Secured Business Loan. That statement is about the named secured product. It doesn’t establish the same repayment choice for every Westpac business loan.

Capture the conditions that affect the decision.

Condition	What the comparison must record
Eligible purpose and entity	Whether the lender accepts this use of funds and this borrower
Security and guarantees	Assets charged, security priority, guarantors and the obligations each party accepts
Evidence	Required financial periods, current trading records, bank statements and forecast support
Repayment dates	Interest frequency, interest-only duration, later instalments and final balance due
Costs	Quoted rate basis, establishment and ongoing fees, early repayment costs and discharge costs
Reviews and covenants	Review dates, reporting duties and any financial conditions the borrower must meet
Flexibility	Rules for extra principal payments, redraw, extensions and other variations

Confirm whether interest is paid from cash or capitalised into debt. Record any limit and approval condition on capitalisation in the forecast. For an extension or repayment change, obtain the lender’s written decision and revised schedule before treating the change as available.

Package and Review the Credit File

Submit a file that lets the assessor trace the interest payments and principal exit back to evidence. Include the purpose record, borrower and ownership details, security information, financial accounts, bank statements and forecast. Attach the principal repayment plan and the evidence supporting its timing and amount.

Keep unresolved conditions visible in the submission. Assign each condition to a named person with a due date, such as obtaining a valuation or documenting an additional cash contribution. Distinguish a requested structure from an approved one.

Set a review before the interest-only period ends and before facility maturity. Allow time to gather updated financial evidence and complete any proposed sale or refinance. Review actual trading against the forecast and revise the principal repayment plan if its assumptions have weakened.

Retain every variation request and the lender’s written response with the file. If the lender approves a change, replace the working repayment schedule with the approved version. The file is ready for a credit decision when both regular interest payments and the principal due date have an evidenced funding source.