An early payment discount is nearly always worth taking if you have the cash available, because the annualised cost of not taking it is far higher than most businesses realise – a typical 2/10 net 30 discount equates to a 37.2% annualised return, which is cheaper than almost any form of borrowing.
But “if you have the cash available” is doing a lot of work in that sentence. For many SMEs, the question is not whether the discount is a good deal in theory, but whether paying early will leave you short when your own bills come due. This article will help you do the maths and make the right call.
What Early Payment Discounts Actually Are
An early payment discount is a reduction offered by your supplier in exchange for paying sooner than the standard terms. The most common format is expressed as a shorthand:
2/10 net 30 means: take a 2% discount if you pay within 10 days, otherwise the full amount is due in 30 days.
Other common variations include 1/10 net 30 (1% for paying within 10 days) and 2/10 net 60 (2% for paying within 10 days instead of 60).
These discounts might look small. Two per cent off an invoice? Hardly worth the effort. But that instinct is wrong, and the reason is annualisation.
The Key Insight: Annualised Cost
A 2% discount for paying 20 days early is not a 2% saving. It is a 2% return on your money for a 20-day period. To compare it with other uses of your cash – or the cost of borrowing – you need to annualise it.
The formula is:
Annualised cost = (Discount % / (100% – Discount %)) x (365 / (Full payment days – Discount days))
For 2/10 net 30:
Annualised cost = (2 / 98) x (365 / 20) = 0.0204 x 18.25 = 37.2%
That means not taking the discount is equivalent to borrowing money at 37.2% annual interest. To put it another way, paying 20 days early to save 2% gives you an annualised return of over 37% on that cash.
For context, a typical business overdraft costs 6% to 12% per year. A revolving credit facility might cost 4% to 8%. Even a business credit card charges 20% to 25%. All of those are dramatically cheaper than the 37% you are effectively paying by not taking the discount.
A Worked Example
Your supplier sends you an invoice for £25,000 with terms of 2/10 net 30.
Option A: Pay within 10 days and take the discount.
You pay £24,500 (saving £500). The cash leaves your account 20 days earlier than it otherwise would.
Option B: Pay on day 30 at the full price.
You pay £25,000 but keep the £24,500 in your account for an extra 20 days.
That extra 20 days of holding £24,500 costs you £500. Over a full year, that is equivalent to paying 37.2% interest for the privilege of holding onto the cash.
Now, if you have £24,500 sitting in a business savings account earning 4%, it earns you roughly £54 over those 20 days. You would be giving up a £500 saving to earn £54 in interest. The discount wins by a wide margin.
What if you need to borrow to take the discount? Even borrowing at 10% on an overdraft to pay early and capture the 2% discount is worthwhile. The overdraft interest for 20 days on £24,500 at 10% is roughly £134. You are paying £134 to save £500 – a net benefit of £366.
When It Makes Sense to Take the Discount
You have the cash and no immediate competing need for it. This is the straightforward case. If paying early does not create a shortfall elsewhere, take the discount. It is one of the highest returns you will find on short-term cash.
You can borrow at a rate lower than the annualised discount. If the annualised cost of not taking the discount is 37% and you can borrow at 8%, borrow the money and take the discount. The arithmetic works clearly in your favour.
You are already going to pay before the full term anyway. If you habitually pay suppliers in 15 days on net 30 terms, you are already giving up most of the cash flow benefit of holding on. You might as well formalise it, pay in 10 days, and get the discount.
When It Does Not Make Sense
Paying early will create a cash crunch. If taking the discount means you cannot cover payroll, tax, or other essential payments, the 2% saving is not worth the risk. A missed payroll or a bounced payment to HMRC costs far more than 2% – in penalties, in reputation, and in stress.
You have higher-return uses for the cash. This is less common for most SMEs, but if you have an opportunity to deploy that cash at a return higher than the annualised discount rate, the opportunity cost calculation changes. In practice, few short-term investments beat 37%.
The discount period is impractical. Ten days is tight. By the time the invoice arrives, gets processed, and gets approved, you might have five days left. If your internal processes cannot reliably hit the discount window, you risk paying early without actually qualifying for the discount.
The DPO Trade-Off
There is a tension here with another piece of cash flow management. Days Payable Outstanding measures how long you take to pay your suppliers, and extending your DPO is a common strategy for improving cash flow. Taking early payment discounts pushes your DPO in the opposite direction – you are paying faster, not slower.
The right approach depends on your overall position. Use the DPO Calculator to see where you stand, then weigh the cash flow benefit of holding on against the financial benefit of the discount.
As a general rule: if you are in a comfortable cash position, take the discount. If cash is tight and you are actively managing DPO to preserve liquidity, hold on to the cash and pay at the standard term. Do not pay late – that damages supplier relationships and may cost you the option of discounts in future.
For strategies on managing this balance, see How to Extend DPO Without Damaging Supplier Relationships.
Making the Decision Systematic
Rather than evaluating each invoice ad hoc, set a simple policy:
- Calculate the annualised rate for every discount your suppliers offer. Any discount with an annualised rate above your cost of borrowing is worth taking if cash allows.
- Check your cash forecast. Before paying early, look at your cash position for the next 30 days. If you can take the discount without dipping below your minimum cash buffer, do it.
- Track the savings. Over a year, early payment discounts on regular supplier invoices can add up to thousands of pounds. Knowing the total makes it easier to justify the discipline.
You can use the DSO Calculator alongside the DPO Calculator to get a complete picture of how cash moves through your business – what you are owed, what you owe, and how the timing of both affects your position.
The Bottom Line
Early payment discounts are one of the simplest ways to improve your bottom line. A 2% discount sounds modest until you realise it is equivalent to earning 37% on your money. For most UK SMEs with adequate cash reserves, the answer is almost always: take the discount.
The only reason not to is if paying early puts your own cash position at risk. Good cash flow management is about the whole picture, not optimising one line item at the expense of another.
This article is for informational purposes only and does not constitute financial advice. Working capital needs vary by business. If you are unsure whether early payment discounts are appropriate for your situation, consider speaking with a qualified accountant or financial adviser.