Bilbx Learn

How we research and review these guides

Last updated 22 September 2026

Who writes these

Hazem Elsawy

Founder & Software Engineer, Bilbx - Perth, WA

I built Bilbx after experiencing the challenges of managing receipts and invoices while working for myself. Along the way, I kept coming back to the same practical questions: which records to keep, how long to keep them, and what they mean for tax time, returns and warranties.

I research and review these guides to make those questions easier to navigate. My approach is to work from official sources, explain the rules in plain language, and link to the original guidance so readers can check it for themselves.

As the founder, I take responsibility for the clarity and care behind what we publish. The aim is to help you understand your records, organise your expenses and have better-informed conversations with your accountant.

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Where the facts come from

We work from primary sources. Our guides are built from the legislation, regulations and official guidance themselves rather than from someone else’s summary of them, and a few also link a consumer body where it explains a right more plainly than the statute does. These sources include:

• Australia: The Australian Taxation Office (ato.gov.au) for tax records and deductions; the Australian Competition & Consumer Commission (accc.gov.au) and Australian Consumer Law for returns, refunds, and warranties.
• United States: The Internal Revenue Service (irs.gov) for business expense records and Schedule C requirements; the Federal Trade Commission (ftc.gov) and the Magnuson-Moss Warranty Act for written warranties, and each state’s Uniform Commercial Code for the implied warranties that sit underneath them. Treasury Regulations and the Internal Revenue Code where a rule turns on the exact wording.
• United Kingdom: HM Revenue & Customs (gov.uk/hmrc) for VAT, Self Assessment and Making Tax Digital record-keeping; and legislation.gov.uk for the statutes themselves - the Consumer Rights Act 2015 for a retailer’s obligations and remedies, the Limitation Act 1980 for how long a claim survives, and the VAT Regulations 1995 for what an invoice has to show.

Source links accompany our guides so you can read the original guidance, check the context and explore the details that matter to you. We aim to make that information easier to understand and use when organising your records or preparing questions for your accountant.

Corrections and feedback

If you notice an outdated figure, a broken link or an explanation that could be clearer, please let us know. Include the guide and the detail you want us to check, along with an official source if you have one. We review reported issues against the relevant sources and update our guides where a correction is needed.

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