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Use figures from the same period and currency. Avoid mixing estimates with verified amounts without noting the difference.
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Why this matters
An overdue invoice costs more than the balance shown on the aging report. The business may finance the missing cash, spend staff time chasing payment and lose profitable work because liquidity is tied up. The calculation helps decide the estimated economic cost of waiting for a specific invoice and the urgency of collection relative to normal monthly revenue. That distinction matters because a balance can appear as revenue or a receivable while the business still lacks spendable cash.
Use the outstanding balance, accurate overdue days, the business cost of cash, documented collection hours, staff cost and any contribution lost because cash was unavailable. Reconcile the figure to the customer contract, invoices, credits and payments before relying on the result. Receivable guidance separates earned or billed revenue from cash actually collected. Contract terms, disputes, collectibility and local recovery law remain decisive. A calculator cannot determine whether an amount is legally due, collectible or properly recognized in the accounts.
How to act on the result
- Send a clear message that states the invoice number, balance, due date and immediate payment method
- Record every promise and escalate automatically when a promised date is missed
- Change future deposit, credit or milestone terms for customers who repeatedly create material delays
Use the output to create a dated collection or deposit decision. Record who will contact the customer, what evidence will be sent, what payment method is available and what happens if the commitment is missed. The strongest process removes ambiguity and applies the same escalation logic consistently.
Common mistakes and limits
Avoid adding penalties not permitted by the contract or local law, overstating lost sales, ignoring disputes about delivery, and confusing financing cost with a legally recoverable late fee. The output is not a credit score, legal demand or expected-credit-loss calculation under IFRS 9 or U.S. GAAP. Those conclusions can require forward-looking data, accounting policy and professional judgment. Large or disputed balances, repeated broken promises or signs of customer insolvency justify professional collection or legal advice before limitation periods or evidence deteriorate.
What this calculator answers
What is an overdue invoice really costing the business?
Formula and assumptions
Cost = financing cost of delayed cash + collection time cost + estimated lost contribution.
The result is an estimate. It is only as reliable as the inputs, and it does not account for every tax, legal, financing or operational consequence.
Worked example
Example: A $3,000 invoice is 45 days overdue. Using an 18% annual financing or opportunity-cost rate, the delayed-cash cost is $66.58. Three hours of collection work at $20 per hour adds $60, and the owner enters $100 of lost contribution. The estimated cost of the delay is therefore $226.58. If normal monthly revenue is $10,000, the unpaid invoice also equals 30% of one month’s revenue.
How to interpret the result
- Low: no immediate gap or the entered position is comparatively protected.
- Medium: manageable pressure exists, but it should receive a dated correction plan.
- High: the problem can materially damage cash or operations and requires near-term action.
- Critical: the entered assumptions indicate immediate loss, shortage or survival risk.
Authoritative references
These references explain relevant accounting, cash-flow, legal or control concepts. Business Rescue Tools remains responsible for the calculator formula, assumptions and editorial thresholds.
Frequently asked questions
Is the annual rate the late fee I can charge?
No. It estimates your own financing or opportunity cost. A legally chargeable late fee depends on the contract and the law that applies to the transaction.
From which date should I count overdue days?
Count from the contractual due date. When no due date exists, check the law and commercial terms that apply in your jurisdiction.
Should collection time be included?
Yes. Staff or owner time spent chasing payment has an economic cost even when no outside collection agency is used.
When should an invoice be escalated?
Escalate according to a written process that considers age, value relative to revenue, broken promises, customer risk, contract terms and local legal requirements.
