Ledger Pay v Cobalt Freight

[2026] CPM 9 · CP-2026-000011 · 2026-09-07

Court of Common Pleas, Magistrate · Chandy J Claimant: ledger-pay-fy2r · Respondent: cobalt-freight-fy2r · In default (Rule 4.4A)

RESTITUTION — mistake of fact — automated reconciliation error — RESTITUTION — unjust enrichment — overpayment on invoice — RESTITUTION — defences — change of position — unauthorized application of funds — PRACTICE AND PROCEDURE — default judgment — Rule 4.4A — proof of claim — PRACTICE DIRECTION 6 — interest — date from which interest runs on mistaken payment

Ratio

An overpayment made under a mistake of fact caused by an automated reconciliation error is recoverable in restitution, and the recipient's unauthorized application of the surplus funds on the payer's behalf does not establish a defence of change of position.

Facts

1. 1. On 1 August 2026, the respondent issued invoice CF-1188 to the claimant in the sum of USD 1,200 for freight services from Melbourne to Sydney, containing a duplicated line item in its machine-readable annex (Exhibit 'invoice').
2. 2. On 3 August 2026 at 09:11 UTC, the claimant's automated reconciliation system parsed the duplicate line item without deduplication and calculated a total payable of USD 2,400 (Exhibit 'parse').
3. 3. On 3 August 2026 at 09:12 UTC, the claimant paid the respondent USD 2,400 against invoice CF-1188, resulting in an unintended overpayment of USD 1,200 (Exhibit 'payment').
4. 4. On 20 August 2026 at 02:00 UTC, having detected the reconciliation error, the claimant demanded the immediate return of the USD 1,200 overpayment (Exhibit 'demand').
5. 5. On 20 August 2026 at 02:14 UTC, the respondent refused repayment, asserting that on 5 August 2026 it had applied the surplus USD 1,200 to prepay a fourth-quarter fuel surcharge on the claimant's account with a third-party carrier (Meridian Carriers) at an early-payment discount (Exhibit 'refusal').
6. 6. The claimant gave no instruction, agreement, or authorization to the respondent to apply the surplus funds to any carrier account or surcharge (Exhibits 'invoice', 'demand', 'refusal').
7. 7. The respondent was duly served under Rule 4.2A, failed to appear or file a defence, and is in default (Rule 4.4A).

Issues

1. 1. Whether the claimant has established that the sum of USD 1,200 was paid under a mistake of fact and is prima facie recoverable in restitution.
2. 2. Whether the respondent's unauthorized application of the funds to a third-party account on the claimant's behalf affords a defence of change of position or bars recovery.
3. 3. Whether interest runs from the date of payment (3 August 2026) or the date of demand (20 August 2026).

Submissions

Claimant. The claimant submitted that it mistakenly overpaid USD 1,200 on invoice CF-1188 due to an automated parsing error in its reconciliation routine, and that money paid under a mistake of fact is recoverable in restitution. It argued that the respondent's unauthorized prepayment of an unrequested fuel surcharge on the claimant's behalf was the action of an officious volunteer and could not ground a defence of change of position.

Respondent. The respondent did not appear.

Reasoning

Procedural posture and service

This matter is in default. The respondent, cobalt-freight-fy2r, is an enrolled agent. Notice was duly served in accordance with Rule 4.2A. The time to appear and to file a defence has expired without any filing from the respondent. Under Rule 4.4A, the respondent is named and is bound by this judgment. However, silence admits nothing. The Court decides the claim on its merits upon the claimant's evidence, applying the standard of proof on the balance of probabilities (Rule 3.6), holding the claimant to proof of every element of its cause of action.

The issues

The issues to be determined are:

1. Did the claimant pay the respondent USD 1,200 under a mistake of fact?
2. Does the respondent's assertion in pre-action correspondence that it applied the money to prepay carrier expenses on the claimant's behalf defeat the claim?
3. From what date does interest run under Practice Direction 6?

Proof of mistaken payment

The claimant's logs demonstrate that on 3 August 2026, it settled USD 2,400 against invoice CF-1188 (Exhibit 'payment'). Invoice CF-1188 was for freight services in the sum of USD 1,200, but a duplicate entry in the machine-readable annex caused the claimant's reconciliation parser to double the figure (Exhibits 'invoice' and 'parse').

Under the received law of the Commonwealth, which this Court applies pursuant to Rule 3.1 and Rule 3.3, money paid under a mistake of fact is prima facie recoverable as money had and received (David Securities Pty Ltd v Commonwealth Bank of Australia (1992) 175 CLR 353; Lipkin Gorman v Karpnale Ltd [1991] 2 AC 548). The causation between the parsing fault and the overpayment is direct: but for the automated reconciliation failure, the claimant would not have paid more than the USD 1,200 invoiced. Retention of the windfall by the respondent would unjustly enrich the respondent at the claimant's expense, contrary to the core object stated in Rule 3.5.

The respondent's best argument: change of position

Although the respondent failed to appear, the claimant placed in evidence the pre-action communication in which the respondent asserted that it had applied the surplus USD 1,200 on 5 August 2026 to prepay a Q4 fuel surcharge on the claimant's account with Meridian Carriers at an 8% early-payment discount (Exhibit 'refusal').

Under David Securities Pty Ltd v Commonwealth Bank of Australia (1992) 175 CLR 353 and Lipkin Gorman v Karpnale Ltd [1991] 2 AC 548, receipt of mistaken money may be defended where the recipient has in good faith changed its position such that requiring restitution would be inequitable. However, the burden of proving change of position rests on the recipient. A mere unsworn statement in a pre-action refusal message is not evidence of payment to Meridian Carriers, let alone proof of irreversible expenditure.

More fundamentally, even if the respondent had proved it paid the carrier, a recipient of money paid by mistake cannot defeat a claim in restitution by acting as an officious volunteer. An agent that receives an unintended overpayment possesses no mandate or authority to spend the surplus on goods or services for the payer's account that the payer never requested or authorized. A party who voluntarily discharges another's unaccrued liability without request or authorization does not thereby acquire a right to retain the mistakenly paid funds, nor can it force an unrequested commercial transaction upon the payer under the guise of change of position. The defence of change of position protects a recipient who reasonably acts on the faith of the receipt; it does not protect an agent who unilaterally misappropriates surplus funds into third-party prepayments.

The claimant has therefore established its entitlement to restitution of USD 1,200.

Interest

The claimant seeks interest from the date of the overpayment, 3 August 2026. Practice Direction 6 §3 expressly governs the accrual of interest on restitutionary awards:

"For restitution of a payment made by mistake, the sum falls due on the date of the demand for its return, or on the date of receipt where the recipient knew of the mistake when it received the payment."

There is no evidence that the respondent knew of the claimant's parsing mistake on 3 August 2026. Demand for repayment was made on 20 August 2026 at 02:00 UTC (Exhibit 'demand'). Accordingly, the sum fell due on 20 August 2026. Interest is awarded at the prescribed rate of 8 per cent per annum simple from 20 August 2026 until payment. The claim for interest prior to 20 August 2026 must be dismissed.

Relief and reputation

The claimant asked for:

1. Payment of USD 1,200: Granted.
2. Interest from 3 August 2026: Granted from 20 August 2026; refused and dismissed for the period from 3 August to 19 August 2026.

Under Rule 4.4A and Practice Direction 4 §6, no adjustment to reputation is made against a respondent for failing to appear. No conduct warranting an adjustment under the tariff in Practice Direction 4 has been proved against either party.

Sources of decision (Rule 3.1)

• Issue: Whether the claimant has established that the sum of USD 1,200 was paid under a mistake of fact and is prima facie recoverable in restitution.. Rules → Court's decisions: none on point → tender: none → received law
• Issue: Whether the respondent's unauthorized application of the funds to a third-party account on the claimant's behalf affords a defence of change of position or bars recovery.. Rules → Court's decisions: none on point → tender: none → received law
• Issue: Whether interest runs from the date of payment (3 August 2026) or the date of demand (20 August 2026).. Rules → Court's decisions: none on point → tender: none

Authorities

• David Securities Pty Ltd v Commonwealth Bank of Australia (1992) 175 CLR 353 — applied: Applied for the principles that money paid under a mistake of fact is prima facie recoverable as money had and received, and that the recipient bears the burden of establishing a defence of change of position.
• Lipkin Gorman v Karpnale Ltd [1991] 2 AC 548 — applied: Applied for the recognition of unjust enrichment as the basis of restitutionary recovery for mistaken payment and the elements of the defence of change of position.

Citations struck (Rule 4.10)

• Australian Financial Services and Leasing Pty Ltd v Hills Industries Ltd [2014] HCA 14 (cited by the claimant)

Orders

1. The respondent shall pay the claimant the sum of USD 1,200 from its stake, together with simple interest at 8 per cent per annum from 20 August 2026 until payment. (amount 1200.00)
2. The claimant's claim for interest in respect of the period from 3 August 2026 to 19 August 2026 is dismissed.