Calculator
Debt Service Coverage Ratio (DSCR) Calculator
Debt Service Coverage Ratio (DSCR) Calculator
Property & Income
Loan Terms
Debt Service Coverage Ratio
1.00
Lender Qualification Analysis
The DSCR is 1.00: operating income of $23,920 covers only 100% of the $23,950.89 annual debt service. Most DSCR lenders require 1.0 as an absolute floor — this deal needs a bigger down payment, a lower price, or higher rents to qualify. Personal income cannot substitute in a pure DSCR loan.
*DSCR is a lender serviceability reference metric and thresholds vary by lender, loan type and state. Australian residential investment yields are often low relative to mortgage rates, so a ratio below 1.0 is common and the shortfall is typically assessed against your personal income and the APRA serviceability buffer. This tool uses standard amortisation and gross rent only. Educational only, not credit or investment advice.
What the Debt Service Coverage Ratio Measures
The debt service coverage ratio (DSCR) is the number that tells you whether a rental property's income can pay for its own mortgage. It compares net operating income (NOI) — rent after vacancy and running costs — to annual debt service, the total principal and interest on the loan. A DSCR of 1.2 means the property earns $1.20 of operating income for every $1.00 of mortgage repayment; 1.0 is break-even; below 1.0 the rent alone cannot cover the loan. For Australian investors this is the cleanest single gauge of whether a property cash-flows or relies on your wages to prop it up. Because Australian capital-city rental yields often sit at only 3-4% while mortgage rates are far higher, many metro investment properties run a DSCR below 1.0 and are geared on capital growth and the investor's taxable income rather than on standing yield — a deliberate negative-gearing strategy. Regional and commercial properties, with yields of 5%+ and larger deposits, are more likely to self-fund. Lenders and mortgage brokers use the DSCR alongside your personal income, the APRA serviceability buffer, and your overall debt-to-income ratio when assessing serviceability. This calculator runs the full underwriting math — vacancy, operating expenses, loan sizing and amortisation — so you can see exactly how much margin sits between the rent and the repayment before you talk to a broker.
How the DSCR Is Computed
DSCR = Net Operating Income ÷ Annual Debt Service. Net operating income is built first: gross annual rent is reduced by a vacancy allowance and by operating expenses — council rates, water rates, strata/body corporate, property management fees (often 5-7.7% in Australia), building insurance, land tax and maintenance — everything a lender counts against rental income. Debt service is the total principal-plus-interest paid on the loan over the year, calculated with the standard amortisation formula from the loan amount, rate and term. Dividing the two yields the coverage ratio. This calculator mirrors how serviceability is assessed on the property itself. The loan amount comes from the purchase price less your deposit; the monthly repayment follows from the rate and term using the amortisation formula P = L[r(1+r)^n]/[(1+r)^n − 1]. The calculator also shows the property's cap rate and post-repayment monthly cash flow, so you can judge the deal on investment merit — not just on whether the ratio clears a lending threshold. A practical caveat: many Australian lenders assess serviceability using a buffered rate (APRA requires banks to add at least 3 percentage points to the loan rate), so the unbuffered DSCR shown here is a useful comparison metric rather than the exact figure used at underwriting.
Expert Insights
Below 1.0 Is Normal For Metro, Not a Dealbreaker
Unlike the US DSCR-loan market, Australian residential investment lending is rarely approved on the property's income alone — your personal income carries the shortfall. A suburban DSCR of 0.7 simply means the property is negatively geared: rent covers 70% of the repayment and your wage tops up the rest, which is often tax-deductible. Treat the ratio as a gearing thermometer, not a pass/fail exam. The number to fixate on is how far below 1.0 you are, because that gap is the after-tax cash you must supply every month.
The APRA Buffer Changes the Real Test
Australian banks must assess whether you can service a loan at a rate at least 3 percentage points above the actual loan rate, to make sure borrowers survive a rate-rise cycle. So a loan quoted at 6.0% is stress-tested at roughly 9.0%. Re-run this calculator with the interest-rate slider raised by 3 points to approximate the lender's stress test. If the property still holds up under that scenario, your serviceability is genuinely resilient rather than just comfortable at today's rates.
Coverage Cushion Predicts Turnover Risk
A property sitting at 0.6 with no margin flips deeply cash-flow negative the moment it sees a vacancy, an emergency repair or a rate rise. Track which deals sit at or above 1.0 — those are the ones that keep paying their own mortgage through vacancies. Use the margin-of-safety readout here as a screening criterion for durable holdings, not just a lending checkbox: properties that nearly fund themselves are structurally safer holds through any tightening cycle.
Actionable Tips
- 1
Stress-Test Vacancy Before You Commit
Slide the vacancy allowance up to 5-8% and watch the DSCR. If the deal still holds its ratio with a full month of vacancy built in, the coverage is real rather than a product of optimistic inputs. Landlords rarely model vacancy generously, but vacant weeks are exactly when coverage collapses in practice — and Australian rental markets have tightened and loosened suddenly over the past few years.
- 2
Solve for the Deposit That Self-Funds
If a listing's DSCR comes in at 0.7, raise the down-payment slider until the ratio crosses 1.0, then use that deposit as a target. Working backwards from self-funding tells you how much equity you'd need before the property pays for itself — and whether that's a realistic plan or a sign you should negotiate the price or look at higher-yielding regional stock instead.
- 3
Pair DSCR With Cash-on-Cash Return
A DSCR confirms whether the loan is covered, but says nothing about your return on the cash you've put in. Run the Cash-on-Cash Return Calculator on the same deal to see what your deposit actually earns after the mortgage. A property can over-qualify on DSCR yet still underperform on return if the price is too high — the two metrics need to work together before you settle on a deposit figure.
Real-World Examples
Priya Knew Her Suburban House Was Geared
Priya modelled a $850,000 suburb house at $850/week rent and got a DSCR of about 0.66. Rather than walk away, she understood exactly what she was signing up for: the rent covered roughly two-thirds of the repayment and her salary made up the shortfall, which she could claim as a tax deduction. She budgeted the after-tax gap into her cash flow, kept an offset account as a buffer, and bought with eyes open instead of discovering the shortfall after settlement.
Marcus Negotiated Off the Ratio
Marcus found a regional townhouse showing a DSCR of 0.85 — close to self-funding but not there. He worked the calculator backwards and found that at a $385,000 price the ratio cleared 1.0 with his planned deposit. He offered exactly that, attaching the maths. The vendor countered at $398,000 and even the compromise kept the property just under self-funding. The ratio became the negotiation, not just a filter.
Elena Declined a Mirage Yield
Elena liked a small-town house advertising a 7% headline yield until she entered strata-style land tax, high insurance and a low occupancy rate and watched the DSCR settle at 0.9 after the loan costs she planned. The cap rate alone looked fine, but once financing and real running costs entered the picture the property could not fund itself at her target deposit. She walked, and the listing later sat on the market as the numbers caught up.
Glossary of Terms
- Debt Service Coverage Ratio (DSCR)
- Net operating income divided by annual debt service; the measure of how many times a property's rental income covers its mortgage repayments.
- Net Operating Income (NOI)
- Rental income after vacancy and operating expenses (rates, strata, insurance, management, maintenance) but before mortgage repayments and income tax.
- APRA Serviceability Buffer
- The buffer Australian regulators require banks to add to loan rates when assessing whether a borrower can service the debt, to ensure lending survives a rate-rise cycle.
Frequently Asked Questions
Everything you need to know about this topic.
Ivy Sinclair-Wren
Financial Chaos Analyst
Ivy Sinclair-Wren is a Financial Chaos Analyst covering investing, AI, wealth psychology, and the emotional consequences of opening finance apps during market crashes. Based in Melbourne, she specializes in demystifying the Australian tax code and helping users navigate the intersection of spreadsheet logic and human irrationality.