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Links Property Finance · Free calculator from a Sydney mortgage broker: BAS Income Calculator for Self-Employed Borrowers

Low doc lenders check your declared income against your BAS turnover. See the range your turnover implies.

Reviewed by Charles Touma Updated 18 October 2026

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Estimate your income from your BAS

Your four most recent quarters

Indicative only, not credit advice and not any lender's formula. Lenders do not derive income from turnover by a fixed percentage; they compare a declared income against turnover for plausibility. Margins vary enormously by industry, and your accountant determines your actual income.

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Self-employed? How much could you borrow on your BAS turnover?

Low doc lenders do not lend straight off turnover. They check the income you or your accountant declares against your BAS sales as a plausibility test, then assess borrowing on that income.

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Enter four quarters of sales, excluding GST, to see the income range those sales imply at different margins.

Part of the employment and income home loans guide.

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How does alt-doc lending use BAS?

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  • Under an alt-doc arrangement your income is generally declared by you and supported by your accountant, with BAS statements and business bank statements used as corroboration.
  • The lender is asking whether the declared figure is credible against the turnover reported to the ATO. It is a sense check, not a calculation, and a declared income wildly out of step with turnover invites questions.

Why do margins vary so much?

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  • A services business with low overheads may retain a high proportion of turnover.
  • A business carrying stock, wages and premises may retain far less on much larger turnover.
  • Neither is better; they are different shapes.
  • That is precisely why no lender applies a single percentage across all industries, and why any calculator claiming to derive your income from turnover alone should be treated carefully.

When is alt-doc the right route?

Where the business is strong but the paperwork lags: a recent structural change, a year not yet lodged, or financials that understate current trading. It is a legitimate product at transparent pricing, generally higher than full-doc lending because the lender holds less verification.

Our low doc guide covers the trade-offs.

What is the route back to mainstream?

Alt-doc should usually be a stage rather than a destination. Once two years of clean financials exist, refinancing to full-doc pricing is the plan that should be discussed at the outset rather than discovered later.

If nobody mentions the exit when arranging the entry, that is worth asking about.

Common questions about BAS and alt-doc

Can I get a home loan using BAS statements?

Yes, with some lenders’ alt-doc loans: your income is declared and supported by an accountant, with BAS and business bank statements as corroboration. Lenders differ on how many quarters they want and what must come with them.

Does turnover determine my income?

No, and any tool suggesting a fixed conversion is misleading. Margins vary enormously by industry and by business. Lenders use BAS to check that a declared income is plausible against reported turnover, not to calculate income from it. This calculator shows a range for that conversation rather than an answer.

Is alt-doc lending more expensive?

Generally yes, because the lender holds less verification and prices for that. How much more varies, and it should be compared against waiting for full financials. Where the business is strong, the premium buys you the ability to act now rather than in eighteen months.

How many BAS statements do lenders want?

Commonly the four most recent quarters, sometimes more, and often alongside business bank statements covering a similar period. The specific requirement differs by lender and by product, so it is worth confirming before assembling paperwork.

Should I use alt-doc or wait for financials?

It depends on what waiting costs you and what alt-doc costs you, and those are both numbers rather than opinions.

If your next financial year will be lodged in a few months and the market is not moving against you, waiting may be cheaper. If the opportunity is now, alt-doc exists for exactly that.

Check the estimate with a broker

Charles can tell you whether alt-doc is needed, or whether a full-doc lender would take the file as it stands.

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Charles Touma, mortgage broker at Links Property Finance
Reviewed by Charles Touma Director & Mortgage Broker · MFAA member · Credit Representative 579003 under ACL 389328 About Charles · All calculators

Estimates only, not credit or financial advice. This tool uses general assumptions and cannot see your credit file, verify your income or apply any particular lender's policy. Your position is confirmed in a full assessment.