Invoice Age vs Advance Calculator UK
How much you can borrow against an invoice depends on its age relative to payment terms. While an invoice is within terms, UK providers typically advance 85 to 90%. Once it goes overdue the advance rate falls in steps, and most providers refuse to fund an invoice that is more than around 60 days overdue, treating anything past 90 days as bad debt rather than working capital. This tool shows the typical advance available as an invoice ages.
| Invoice status | Typical advance rate | What providers do |
|---|---|---|
| Within payment terms | 85 to 90% (higher for investment-grade debtors) | Standard advance across most UK providers |
| 1 to 30 days overdue | 70 to 80% | Most still fund at a reduced rate; stronger debtors fare better |
| 31 to 60 days overdue | 40 to 60% | Heavily reduced; collection evidence wanted; some refuse |
| 61 to 90 days overdue | 0 to 40% | Most refuse; only investment-grade debtors may still fund |
| Over 90 days overdue | 0% | Treated as bad debt; pursue collection or write off |
Calculator
How much you can advance
£9,000
Invoice is within payment terms. Typical 90% advance available across most UK invoice finance providers.
| Item | Value |
|---|---|
| Invoice value | £10,000 |
| Days since invoice issued | 45 |
| Payment terms | 60 days |
| Days overdue | 0 (still within terms) |
| Customer credit quality | Investment-grade (large UK plc, govt, NHS) |
| Advance rate available | 90% |
| Advance amount | £9,000 |
| Status | Standard advance |
Source: Market Invoice invoice age vs advance calculator
Illustrative default scenario. Within terms, investment-grade debtors attract 90%, strong SMEs 88%, standard debtors 85%. The table above shows how the rate falls once an invoice goes overdue.
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### Worked example: £10,000 invoice, 45 days old on 60-day terms (default calculator scenario) | Item | Value | | --- | --- | | Invoice value | £10,000 | | Days since invoice issued | 45 | | Payment terms | 60 days | | Days overdue | 0 (still within terms) | | Customer credit quality | Investment-grade (large UK plc, govt, NHS) | | Advance rate available | 90% | | Advance amount | £9,000 | | Status | Standard advance | Source: Market Invoice invoice age vs advance calculator Illustrative default scenario. Within terms, investment-grade debtors attract 90%, strong SMEs 88%, standard debtors 85%. The table above shows how the rate falls once an invoice goes overdue.
“Advance rates track debtor quality far more than invoice age alone. A fresh invoice on a shaky customer can be advanced less than an older one on a blue-chip payer, so use this as a directional guide, not a guaranteed rate.”
What this tool tells you
How much can you borrow against an invoice depending on its age? UK providers reduce advance rates for older invoices and refuse some entirely past 90-120 days. This tool shows the typical advance available against a 30/60/90/120-day-old invoice.
All UK invoice finance providers serve businesses across the full UK. The numbers above are typical UK market rates for invoice age advance rate UK. For real quotes matched to your specific business, use our 60-second comparison tool.
Invoice age and advance rate FAQ
Why does invoice age change the advance rate?
The older an invoice gets relative to its payment terms, the more it looks like a collection risk rather than working capital. UK invoice finance providers respond by cutting the advance rate as an invoice moves overdue, and most stop funding entirely once it is well past terms, because an unpaid invoice that old is treated as bad debt.
How old can an invoice be and still be funded?
Within terms, expect a typical 85 to 90% advance. Once 1 to 30 days overdue the rate usually drops to 70 to 80%, and 31 to 60 days overdue it falls further with providers wanting collection evidence. Beyond about 60 days overdue most UK providers refuse, and past 90 days overdue it is generally treated as unfundable.
Does customer credit quality affect older invoices?
Yes. Investment-grade debtors (large UK plc, government, NHS) and strong, established SMEs hold a higher advance rate as an invoice ages than standard or smaller SME debtors. On a borderline overdue invoice, a strong debtor can be the difference between a reduced advance and a decline.