The Accounting Term for Unpaid Invoices (AR, and What "Bad Debt" Really Means)

The accounting term for unpaid invoices is accounts receivable (AR). That's the label for money a customer owes you for goods or services you've already delivered and invoiced. Once it's clear a customer will never pay, the term changes: the invoice becomes a bad debt, and the amount is written off as an expense. Between those two points sits the reporting tool most small businesses ignore — the aging report.

This post covers the exact vocabulary, what each term means in your books, and how long an invoice can sit unpaid before you have to treat it differently.

The terms, defined precisely

Accounting is fussy about labels because each one changes how a number appears on your financial statements. Here's the mapping:

Accounts receivable — the outstanding balance a customer owes you. It's recorded as a current asset on the balance sheet, because you expect to collect it within a normal operating cycle (typically within a year). An unpaid invoice is the document; accounts receivable is the balance.

Trade receivables — essentially a synonym, but more specific: receivables arising from normal sales to customers, as opposed to loans you've made to someone.

Outstanding / open invoice — operational language rather than strict accounting language. An invoice is "open" until paid. Software usually splits this into due (inside the payment window) and overdue (past the due date).

Bad debt — a receivable you've concluded is uncollectible. Once written off, it comes off the balance sheet and hits the income statement as an expense.

Allowance for doubtful accounts (also called the provision for credit losses) — a contra-asset estimate of how much of your AR you don't expect to collect. It sits against AR, so the balance sheet shows the amount you actually expect to receive. Larger businesses are often required to estimate this; the specific method and thresholds depend on the accounting standards your business follows and your country.

Interest on overdue invoices / late fees — a contractual charge, not an accounting category. Whether you can charge it depends on your invoice terms and the rules where you operate.

If you're on cash-basis accounting, the terminology matters less in practice, because you don't record income until the money arrives — so an unpaid invoice doesn't hit your books at all. On accrual accounting, the invoice counts as revenue immediately, which is exactly why the AR entry exists. Which basis applies to you depends on your business structure, size, and local rules — worth confirming with a local accountant rather than assuming.

Photo by Jakub Żerdzicki on Unsplash

Aging: the report that tells you which term applies

Accountants don't decide a receivable is bad based on gut feel. They use an aging report, which buckets every unpaid invoice by how many days past due it is. A common structure looks like:

• Current (not yet due)
• 1–30 days past due
• 31–60 days
• 61–90 days
• 90+ days

The exact bucket boundaries aren't standardized — different companies and lenders use different cutoffs — but the logic is universal: the further down the buckets an invoice sits, the lower the probability of collection and the more seriously you need to provision against it.

Most accounting rules won't let you declare a receivable dead the moment it's late. Write-off thresholds depend on your jurisdiction, your evidence that you've pursued collection, and the thresholds set by your tax authority. In many places you need to show genuine collection efforts before a write-off is accepted for tax purposes. Check your local rules — this is a place where guessing gets expensive.

That's also the practical argument for tracking this yourself rather than waiting for an accountant at year-end. The Invoala payment tracking view shows which invoices are paid, due, or overdue, so the aging picture is visible as it forms rather than reconstructed months later.

Ready to try it? Create a professional invoice in under two minutes with Invoala's free invoice generator, no sign-up and no watermark.

Example: recording an unpaid invoice and its write-off

Say you invoice $2,400 for design work, with 8% sales tax on top, so the customer owes $2,592. Payment terms are net 30. The bookkeeping runs in three stages.

1. When you issue the invoice (accrual basis):

| Account | Debit | Credit |

|---|---|---|

| Accounts receivable | $2,592 | |

| Revenue | $2,400 | |

| Sales tax payable | $192 | |

You've earned $2,400 of revenue and you owe the tax authority $192 whether or not the customer pays. That second point surprises people — the tax liability is created by the sale, not by the payment, in most VAT/GST-style systems. Confirm the treatment for your own tax regime.

2. 60 days later, still unpaid. No journal entry is strictly required yet — the invoice is just an aging AR balance. Under the allowance method you might book an estimate, say 10% of the 61–90 day bucket, as bad debt expense with a matching credit to the allowance. $259 of expense, reducing net AR to $2,333. The specific percentage is a judgement call based on your own collection history.

3. You give up and write it off. Debit bad debt expense $2,592, credit accounts receivable $2,592. The receivable leaves the balance sheet. What happens to the $192 of sales tax you already remitted depends on your jurisdiction — many tax authorities allow a bad debt relief claim, but the conditions vary. Ask before you assume.

That total cost isn't the $2,400 of work — it's $2,592 of cash you never see, plus whatever you spent chasing it.

Photo by Kelly Sikkema on Unsplash

What this means for how you actually invoice

The accounting language is the easy part. The hard part is that AR only stays collectible if someone is watching it. A few habits that keep your receivable balance honest:

Put a clear due date on every invoice, not just "net 30." The due date, the invoice date, and a unique sequential invoice number are typically required on a valid invoice anyway. If you're drafting one from scratch, a step-by-step guide to creating an invoice covers the fields that actually matter.

Send reminders on a schedule, not when you remember. The 1–30 day bucket is where recovery rates are highest and where most small businesses lose the plot. Automated follow-ups exist precisely because the reminder you send on day 3 is far more effective than the one you send on day 60 after an awkward phone call.

Keep numbering and dates consistent. If you ever need to reconstruct an aging report or defend a write-off, sequential invoice numbers and clean issue dates are the difference between a five-minute answer and a bad afternoon.

How Invoala helps

If the reason your receivables tracking is shaky is that invoicing itself is a sprawl of half-finished Word documents, Invoala covers the steps this post walks through:

1. Create the invoice. Use the free invoice generator — fill in a form, add line items and tax, and download an A4-accurate PDF. No sign-up and no watermark, which matters if you're sending a handful of invoices a month and don't want an "unpaid invoice generator" banner on the bottom of a document you're chasing for money.

2. Get the required fields right. If you'd rather start from a known-good layout, the free downloadable invoice templates include the standard fields — invoice number, dates, itemised amounts, tax.

3. Track what's paid, due, or overdue. The tracking view gives you the live version of the aging report described above, so you know which bucket each invoice belongs in without building a spreadsheet.

4. Follow up without the awkwardness. The automated payment reminders handle the day-3-to-day-60 sequence that keeps invoices out of the 90+ bucket in the first place.

5. Issue estimates first. Sending a written quote before you start work reduces the disputes that later become uncollectible receivables — there's a free estimate generator for that.

Invoala is free to use, with an optional paid tier if you need more; details are on the pricing page.

The one-line answer to remember

If a customer owes you money for work already invoiced, call it accounts receivable on the balance sheet. If you've concluded it'll never arrive, call it bad debt on the income statement. Everything in between — aging buckets, allowances, reminders — exists to keep you from crossing that line unnecessarily. And when in doubt about a write-off, a tax treatment, or a provision estimate, check with a qualified accountant in your jurisdiction rather than a blog post, including this one.