IB Business Debt Equity & Efficiency Ratios

The Numbers That Show If Your Business Is Actually Any Good (Efficiency Ratios Explained)

Target question:

What are the main efficiency ratios in IB Business Management and how do you calculate them?

Right, let's go back to when you were 12 or 13 years of age, imagine you were running a lemonade stand. You got the recipe sorted, customers loved it, and you were making decent money. But - were you actually running it well? Like, properly well?

You might have been selling loads of lemonade, but if it took you three months to collect money from customers who said "I'll pay you back, mate," or if half your lemons were going mouldy in storage because you bought way too many, you got a problem. You were making money, sure, but you were doing it in the most inefficient, cash-draining way possible.

This is where efficiency ratios come in. They're basically the report card for how well you're using your resources. At IB Business Management level, examiners absolutely love asking you to calculate these and then suggest ways to improve them. So let's crack on.

Efficiency Ratios: IB Business Management Definitions

IB Business Management definition - Efficiency ratios:

Measure how effectively a business is using its resources - stock, credit terms, and capital structure - to generate sales and manage cash flow. Unlike profitability ratios, which focus on how much money a business ultimately makes, efficiency ratios reveal how well it manages the practical, day-to-day mechanics of turning stock and credit into usable cash.

IB Business Management definition - Stock turnover (also called inventory turnover):

Measures how many times a business sells and replaces its average stock in a year.

Stock Turnover = Cost of Sales ÷ Average Stock, or expressed in days as (Average Stock ÷ Cost of Sales) × 365, where Average Stock = (Opening Stock + Closing Stock) ÷ 2.

A higher stock turnover generally indicates efficient inventory management and strong demand, though the "ideal" figure varies enormously by industry - fresh food retailers turn stock over far more often than luxury jewellers, and both can be perfectly healthy.

IB Business Management definition - Debtor days:

Measures the average number of days a business takes to collect payment from customers who bought on credit. Debtor Days = (Debtors ÷ Total Sales Revenue) × 365. The lower the figure, the faster cash is coming into the business - a business with high debtor days is effectively lending money to its customers interest-free.

IB Business Management definition - Creditor days:

Measures the average number of days a business takes to pay its own suppliers. Creditor Days = (Creditors ÷ Cost of Sales) × 365. Businesses generally want this figure to be higher than their debtor days, since holding cash for longer before paying suppliers improves short-term cash flow.

IB Business Management definition - Gearing ratio:

Measures the proportion of a business's capital employed that comes from long-term debt rather than equity.

Gearing Ratio = (Non-current Liabilities ÷ Capital Employed) × 100, where Capital Employed = Non-current Liabilities + Equity.

A higher gearing ratio indicates greater reliance on borrowed money, which increases financial risk but can also fund faster growth.

The key working capital principle for IB Business Management exams: ideally, creditor days should be longer than debtor days, so a business collects cash from its own customers before it has to pay its own suppliers. Getting this the wrong way round - paying suppliers faster than customers pay you - is one of the most common causes of a cash flow crisis, even in a business that is otherwise profitable.

Stock Turnover: The "How Fast Can You Shift Your Stuff?" Ratio

Alright, stock turnover (or inventory turnover if you're feeling fancy) tells you how many times a business sells and replaces its stock in a year. Or, flipped around, how many days it takes to sell your average stock.

There are two ways to calculate it:

Option 1: How many times per year

Stock Turnover = Cost of Sales ÷ Average Stock

Option 2: How many days it takes

Stock Turnover = (Average Stock ÷ Cost of Sales) × 365

Where: Average Stock = (Opening Stock + Closing Stock) ÷ 2

IB Business Management Real-life Example: Zara vs. Your Local Jeweller

Let's talk about Zara for a second. Those people turn over their stock 12 times a year. Twelve! That means every single month, pretty much everything in the shop gets sold and replaced with new stuff. The company can move from design concept to store shelf in just two weeks, and they sell 85% of their clothing at full price - incredible numbers these days when you think about it.

Compare that to a luxury jeweller selling Rolex watches. They might only turn their stock over 2-3 times a year, but that's completely fine because each sale makes them a fortune and the products don't go out of style or, you know, rot.

UK supermarkets like Tesco (with £61.45 billion annual turnover) and discount chains like Aldi and Lidl have been expanding aggressively, with Aldi planning to open 40 new stores in 2025. Why? Because their entire business model depends on high stock turnover. Fresh milk doesn't wait around.

When High Stock Turnover is Brilliant

• Supermarkets and fresh food: Your bananas will be brown mush if you don't shift them quick

• Fast fashion: Trends change faster than your brain allows you to think

• Tech: Last year's iPhone is basically ancient history

When Low Stock Turnover is Actually Fine

• Luxury goods: Limited edition trainers, designer watches, high-end cars

• Property developers: You can't exactly knock out houses every fortnight

• Furniture retailers: People don't buy sofas that often

How to Improve Stock Turnover

1. Reduce or eliminate the dead stock - That inventory of fidget spinners from 2017? Bin it (or heavily discount it). Get rid of obsolete products that are just gathering dust and costing you money to store.

2. Narrow your range - Stop trying to stock every possible variation. Zara produces items in limited quantities, creating scarcity that makes customers buy immediately rather than wait. Focus on what actually sells.

3. Go Just-in-Time (JIT) - Only order stock when you need it. Scary? Maybe. Efficient? Absolutely. Your warehouse isn't a museum.

Worked Example Time: A business has average stock of £10,000 and cost of sales of £100,000.

• Stock turnover (times) = £100,000 ÷ £10,000 = 10 times per year

• Stock turnover (days) = (£10,000 ÷ £100,000) × 365 = 36.5 days

So they're selling and replacing their entire stock every 36-37 days. Not bad!

Debtor Days: The "How Long Until People Actually Pay You?" Ratio

This one's dead simple but absolutely crucial. Debtor days tells you how long it takes, on average, to collect money from customers who bought stuff on credit.

Debtor Days = (Debtors ÷ Total Sales Revenue) × 365

The lower the number, the better. Why? Because every day someone owes you money is a day you don't have cash to pay your bills.

IB Business Management Real-life Example: The Boohoo Situation

In early 2025, fast-fashion retailer Boohoo extended payment terms for some UK suppliers from 30 to 45 days, and international suppliers from 75 to 90 days. One supplier told reporters, "This will impact our business, especially as it's difficult to get credit insurance on Boohoo at the moment."

That's the drawback of debtor days - your debtor days are someone else's creditor days (more on that in a minute). When you take ages to collect payments, your own cash flow suffers. In 2024, the then-Boohoo Group withheld payment to some suppliers after alleging goods didn't meet standards, and suppliers reported being owed hundreds of thousands of pounds.

See the problem? Customers aren't paying you, but your suppliers still want their money. Cash flow crisis incoming.

How to Improve Debtor Days (Get Your Money Faster)

1. Offer cash discounts - "Pay within 10 days and get 2% off!" Suddenly everyone's got their wallets out.

2. Tighten credit terms - Maybe 60-day payment terms were too generous? Drop it to 30.

3. Actually chase the money - Send reminders. Make phone calls. Be polite but persistent. That invoice won't pay itself.

4. Credit check your customers - Only offer credit to people who've got a track record of actually paying their bills.

The industry average for debtor days varies, but the overall median across industries is 56 days, with clothing and home goods companies recording the lowest median debtor days due to their dependency on physical inventory and requiring faster post-transaction payments.

Creditor Days: The "How Long Can You Delay Paying Your Bills?" Ratio

Now we're on the other side. Creditor days measures how long you take to pay your suppliers.

Creditor Days = (Creditors ÷ Cost of Sales) × 365

You generally want this number to be higher than your debtor days. Why? Because if customers pay you in 30 days but you can pay suppliers in 60 days, you've got cash sitting in your account for 30 days. Free money to use!

But... delay too long and you'll damage relationships with suppliers, possibly face late payment charges, or they might just refuse to work with you altogether.

What is Reasonable?

Trade credit is typically 30-60 days, which is considered acceptable. The key is this: Creditor Days should be longer than Debtor Days (if possible) to improve your net cash flow.

If your debtor days are 45 and creditor days are 60, you're golden. If it's the other way around (collecting in 60 days but paying in 30), you've got a cash flow headache.

How to Improve Creditor Days

1. Negotiate extended terms - Ask your suppliers for longer payment periods. The worst they can say is no.

2. Find better suppliers - Shop around for suppliers offering better credit terms.

3. Consider paying cash instead - Wait, what? Sometimes paying cash gets you better prices or discounts that outweigh the benefit of delayed payment.

Gearing Ratio: The "How Much Are You Relying on Debt?" Ratio

Right, gearing. This one's about your capital structure - basically, how much of your business is funded by borrowing (debt) versus how much is funded by owners' money (equity).

Gearing Ratio = (Non-current Liabilities ÷ Capital Employed) × 100

Where: Capital Employed = Non-current Liabilities + Equity

High Gearing vs. Low Gearing

Highly geared = Loads of debt. Risky during a recession, vulnerable to interest rate rises, but can fuel rapid growth.

Low gearing = Mostly equity-funded. More financially stable, less risky, but might be missing growth opportunities.

IB Business Management Real-life Example: Tesla The Gearing Turnaround Story

Let me tell you about Tesla because it's a great example of how gearing can change dramatically. Tesla's debt-to-equity ratio declined significantly from 0.53 in 2020 to just 0.07 in 2022, indicating a major reduction in reliance on debt financing. By 2024, it had ticked up slightly to 0.11, but still remained very low.

Point is, Tesla went from being quite heavily geared to having one of the lowest debt ratios in the automotive industry.

How? Rising share prices and increasing profitability allowed Tesla to restructure its capital framework, leaning more heavily on equity-based funding rather than debt. When your shares are worth loads, you don't need to borrow as much.

When is High Gearing Actually Okay?

Here's the thing examiners want you to know: high gearing doesn't automatically mean "bad."

If you're a growing business with solid revenue, low interest rates, and big expansion plans, borrowing can make perfect sense. The debt finances growth, which generates more profit, which pays off the debt. Sorted.

It's only a problem when:

• Interest rates spike and your repayments become crippling

• A recession hits and your revenue drops but debt payments stay the same

• You can't generate enough profit to service the debt

How to Reduce Gearing

1. Pay off some debt - Obvious but effective. Use profits to reduce your non-current liabilities.

2. Improve working capital - Better stock control and faster debtor collection generates cash you can use to pay down debt.

3. Use internal finance - Retained profits and share capital instead of loans for your next expansion.

Why Efficiency Ratios Are Relevant

Here's what you need to understand for your exams (and for life, frankly): profitability and efficiency go hand-in-hand.

You can have brilliant profit margins, but if your cash is tied up in stock no one's buying, or customers who aren't paying you, or if you're drowning in debt repayments, you're going to struggle. Fast fashion brands with turnover ratios around 12 annually have reduced markdowns by about 15% because faster-moving stock needs fewer discounts to clear shelves.

Think about it this way:

• Stock turnover = How quickly you convert inventory into cash

• Debtor days = How quickly you convert sales into cash

• Creditor days = How long you can delay cash leaving your business

• Gearing = How much financial risk you're carrying

Learn these, and you're understanding how businesses actually survive and thrive in the real world.

Practise This Topic: The IB Business Management Activity Book

Efficiency ratios are exactly where students lose marks - not on the calculation itself, but on the evaluation that follows. Module 3 Units 3.5 and 3.6 of the IB Business Management Activity Book includes worked case studies covering stock turnover, debtor days, creditor days and gearing side by side, so you can practise the calculation and the "so what does this actually mean for the business" argument examiners are looking for, all with full model answers and marking schemes.

The IB Trainer's IB Business Management Activity Book covers:

• ✓ All 6 IB Business Management modules (5 Modules + the Complete IB Business Management Toolkit broken down unit-by-unit

• ✓ 2-6 case studies per unit (some units need more practice than others)

• ✓ Every IB Business Management Assessment Objective (AO) explicitly addressed

• ✓ All 15 IB Business Management Toolkit tools with worked examples

• ✓ IB Business Exam Socially responsible companies (business as force for good)

• ✓ Platform access with supporting video content

Stay well,

Frequently Asked Questions: Debt, Equity and Efficiency Ratios (IB Business Management)

What is stock turnover and how do you calculate it?
Stock turnover measures how many times a business sells and replaces its average stock over the course of a year. It's calculated as Cost of Sales ÷ Average Stock, or expressed in days as (Average Stock ÷ Cost of Sales) × 365, where Average Stock = (Opening Stock + Closing Stock) ÷ 2. A high stock turnover, like Zara's roughly 12 times a year, generally signals strong demand and efficient inventory management, while a low figure can indicate overstocking or slow-moving products - though for luxury goods or property, a low turnover is entirely normal and doesn't signal a problem.

What is a good number of debtor days for a business?
There's no single "good" figure - it depends heavily on the industry and the credit terms a business offers. The overall median across industries sits around 56 days, though clothing and home goods businesses tend to record lower debtor days because they depend more on physical inventory turning into cash quickly. What matters most for IB exam answers is the trend and the comparison to industry norms: rising debtor days over time, or debtor days significantly above the sector average, both signal a business is taking longer to collect what it's owed.

Why should creditor days be longer than debtor days?
If a business collects payment from its own customers faster than it has to pay its own suppliers, it effectively holds free cash for the gap between those two dates, easing pressure on working capital. If the relationship is reversed - paying suppliers faster than customers pay the business - the business can face a cash flow shortage even while trading profitably, since it's committing cash out the door before the matching cash has come in. This is exactly the kind of timing mismatch that pushed retailers like Wilko toward crisis, even with genuine sales happening in-store.

What does the gearing ratio measure, and is high gearing always risky?
Gearing measures what proportion of a business's capital employed comes from long-term debt rather than equity, calculated as (Non-current Liabilities ÷ Capital Employed) × 100. High gearing isn't automatically bad - a growing business with strong revenue and low interest rates can use debt to fund expansion profitably, as Tesla did in its earlier years. It becomes genuinely risky when interest rates rise, revenue falls, or profit can't comfortably cover the debt repayments, which is why examiners want to see gearing evaluated in the context of the wider economic environment, not judged against a fixed "ideal" number.

What's the difference between debtor days and creditor days?
Debtor days measures how long it takes a business to collect money it's owed by its own customers, while creditor days measures how long that same business takes to pay money it owes to its own suppliers. They're mirror images of the same trade credit relationship - one business's debtor days are effectively another business's creditor days - and comparing the two tells you whether a business is a net lender or net borrower of short-term cash within its own supply chain.

Related Content:

Continue Learning: IB Business Management Blog

• IB Business Insolvency vs. Bankruptcy Explained - poor efficiency ratios, especially slowing stock turnover and rising debtor days, are often the early warning signs that precede an insolvency crisis like Wilko's.

• IB Business Cash Flow Exposed - why the timing gaps measured by debtor days and creditor days matter just as much as overall profitability for short-term survival.

• IB Business Profitability and Liquidity Ratios - the other two ratio families examiners expect you to combine with efficiency ratios for a full financial health evaluation.

• IB Business Management Finance and Accounts - your complete hub for all Module 3 topics

• IB Business Management - your complete IB Business Management resource

• IB Business Management Toolkit - all 15 analytical tools you need for the three IB Business Management exam papers and the IA

Take Your Revision Further

Want to practise calculating all four efficiency ratios and building the evaluative argument examiners reward around them? Module 3 of the IB Business Management Activity Book includes efficiency ratio case studies with worked examples and model answers demonstrating the full AO1 to AO4 argument structure.

Explore the IB Business Management Activity Book here.

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