What if I cannot remember the exact date?

Use the narrowest honest estimate and explain its basis. Update the entry if a reliable record is later found.

Should every message be a separate event?

Include messages that materially change the facts, request, response, deadline or outcome.

Can I add an event without supporting material?

Yes, but label it as a recollection or unsupported entry rather than implying a document exists.

How often should the timeline be updated?

Update it after a meaningful event, new document, response, payment, appointment or deadline change.

How to Build an Unpaid Invoice Timeline

How to build an unpaid invoice timeline

Start with the agreement, then record when goods or services were supplied, when the invoice was issued and due, every payment or credit, and each reminder or customer response.

General information only — not legal advice · Reviewed 2 October 2026

General organisation guideChoose country and region before relying on jurisdiction-specific legal steps or deadlines.

Choose location

Preserve the originals

Keep the original quote, contract, purchase order, invoice, delivery record, messages, emails and payment records. Do not overwrite the only available copy.

Start with fixed events

Add reliable dates first: quote acceptance, purchase order, delivery, completion, invoice issue, due date and payments.

Add changes and variations

Record agreed changes to scope, quantity, price, delivery or timing and link the record that supports each change.

Add reminders and responses

Summarise meaningful reminders and replies neutrally and keep the complete source message.

Reconcile the balance

List credits, adjustments and part payments separately. Keep the original invoice unchanged.

Mark uncertainty and gaps

Use labels such as approximately or date estimated rather than inventing precision.

Practical record

Date	Event	Amount	Supporting record	Status
3 March	Quote accepted	A$4,000	Accepted quote Q-104	Scope confirmed
12 March	Work completed	—	Completion sheet C-02	No defect noted
13 March	Invoice issued	A$4,000	Invoice INV-208	Due 27 March
1 April	Customer replied	—	Email E-05	Promised payment
5 April	Part payment	A$1,000	Bank entry P-01	Balance A$3,000

Synthetic example only. Dates, facts and amounts are fictional.

Important limitation

The timeline is an organisational aid. It does not prove that every event occurred as described or decide the legal importance of an item.

Related evidence guides

Keep building the record

Unpaid invoice evidence checklist Evidence when there is no written contract Start-to-finish unpaid invoice example

Continue the journey

Use the right tool for the next job

GetInstantProofReturn to the unpaid-invoice evidence checklist.GetInstantResolvePrepare the next payment-recovery step.GetInstantLawCheck legal information for your country and state or region.

Common questions