Most finance teams have a handle on revenue, margin, and EBITDA. Fewer have a tight grip on the three numbers that actually determine whether cash is available to operate and grow: DSO, DPO, and inventory days.
In today's environment with payment terms stretching, supply chains still shifting, and the cost of capital higher than it's been in years, getting these right matters more than ever. This is a strategic refresher on what each metric measures, where the real levers are, and how financing tools interact with each one.
💡 Key takeaways
DSO, DPO, and inventory days are the three components that make up the cash conversion cycle
Each metric has both operational and financial levers – and they interact with each other
Improving all three compounds: shaving days off each one adds up faster than most finance teams expect
Financing can be used strategically to influence each metric without changing underlying commercial terms
The goal isn't to optimize each in isolation – it's to manage them as a system
DSO: Days Sales Outstanding
DSO measures how long it takes to collect payment after a sale is made.
DSO = (Accounts Receivable ÷ Revenue) × 365
A DSO of 60 means that, on average, customers are paying 60 days after the invoice is issued. For product brands selling through retail or wholesale channels, DSO of 45–90 days is common. For those selling direct-to-consumer online, it can be as low as 1–3 days.
High DSO is one of the most common working capital drains in product businesses – and one of the most underestimated. It doesn't show up as a cost on the P&L, but it has a very real impact on cash availability. A brand doing $5 million in annual revenue with a DSO of 90 days has roughly $1.25 million sitting in unpaid invoices at any given time.
What drives high DSO:
Retail and wholesale payment terms (30–90 days is standard; some large retailers push to 120)
Inconsistent invoicing – invoices going out late, with errors, or to the wrong contact
Weak credit controls and no systematic follow-up on overdue payments
Customer concentration – a few large accounts that dictate terms
How to improve it: The most immediate lever is process: invoice immediately on delivery, automate payment reminders, and chase overdue accounts consistently. These steps alone can take 5–10 days off DSO without touching any commercial relationships.
Beyond process, the commercial conversation is worth having. Early payment discounts – typically 1–2% for payment within 10 days – can shift the economics for some customers and meaningfully reduce DSO across a portfolio. This has a cost, but it's often cheaper than the alternative of financing the gap.
For brands with a strong wholesale or retail order book, invoice financing is the structural solution. It allows you to access cash from outstanding invoices before they're due, effectively decoupling your cash flow from your customers' payment behavior. DSO from a cash perspective drops to near zero – you receive funds almost immediately after issuing the invoice, while the financing provider waits for the customer to pay. Learn more about invoice financing using Treyd.
DPO: Days Payable Outstanding
DPO measures how long you take to pay your suppliers.
DPO = (Accounts Payable ÷ Cost of Goods Sold) × 365
Unlike DSO and inventory days, a higher DPO is generally positive. It means you're holding onto cash longer before it goes out – which reduces the amount of working capital you need to fund operations at any given time.
A DPO of 45 means you're paying suppliers 45 days after receiving goods or services. Getting that to 60 or 75 days can make a significant difference to your cash position, particularly on large production runs.
What drives low DPO:
Supplier payment terms that haven't been renegotiated as the business has grown
Early payment defaults – paying before terms require it, often because of poor AP process
Supplier concentration – one or two critical suppliers with significant negotiating leverage
New supplier relationships where you haven't yet established favorable terms
How to improve it: The most direct route is negotiation. As order volumes grow and you become a more important customer, the conversation about extending payment terms from 30 to 60 or 90 days becomes more credible. It's a conversation most finance teams delay longer than they should.
Internally, making sure you're actually using the full terms you already have is often the fastest win. Many businesses pay suppliers ahead of schedule simply because the AP process isn't tight. Systematic payment runs aligned to due dates – rather than ad hoc payments – can extend effective DPO by 10–15 days without any supplier negotiation at all.
For brands that can't or don't want to renegotiate supplier terms directly, inventory financing effectively achieves the same outcome. You pay the supplier on time – or even upfront, which some manufacturers require before production starts – while the financing provider extends the actual cash outflow by 30, 60, 90, or 120 days. Read how invoice financing works with Treyd. From a working capital perspective, the effect on DPO is equivalent to having negotiated extended terms.
Inventory days
Inventory days measures how long products sit in stock before being sold.
Inventory Days = (Average Inventory ÷ Cost of Goods Sold) × 365
A high inventory days figure means capital is sitting in a warehouse rather than generating revenue. For product businesses with international supply chains and seasonal demand patterns, inventory days is often the largest single driver of a long cash conversion cycle.
What drives high inventory days:
Inaccurate demand forecasting – over-ordering to avoid stockouts
Long supplier lead times that force larger, less frequent orders
Wide SKU ranges where slower-moving lines inflate the average
Seasonal businesses that hold large amounts of pre-season stock
How to improve it: Better demand forecasting is the primary lever – and the hardest to execute well. Connecting inventory planning to actual sell-through data, channel by channel, reduces the buffer stock that most brands carry as a hedge against uncertainty. Every SKU you carry that moves slowly is tying up capital that could be working elsewhere.
SKU rationalization is underused in growing brands. Cutting slow-moving lines frees up working capital and simplifies the supply chain, even if it feels like leaving revenue on the table. Often it isn't – the margin improvement and capital release more than compensate for the lost top line.
Lead time reduction – negotiating faster production and shipping, or shifting to suppliers closer to key markets – directly reduces the minimum inventory days you need to carry as safety stock.
Financing doesn't directly reduce inventory days, but it changes the cost of carrying them. When inventory financing covers the gap between production payment and customer receipt, the cash cost of holding 90 days of stock becomes manageable rather than constraining – which means brands can make better stocking decisions without being forced into under-ordering to preserve liquidity.
How the three metrics connect
DSO, DPO, and inventory days aren't independent variables. They combine directly into the cash conversion cycle: → The cash conversion cycle explained
Cash Conversion Cycle = Inventory Days + DSO − DPO
This formula makes the interaction explicit. Improvements in any one metric reduce the cycle. Improvements in all three compound. A brand that takes 10 days off inventory days, 10 days off DSO, and adds 10 days to DPO has improved their cash conversion cycle by 30 days – which, at scale, is a significant amount of working capital freed up.
It also highlights where the real risk sits. A brand that's growing fast will typically see inventory days increase (larger orders) and DSO increase (more retail distribution) at the same time. If DPO stays flat because supplier terms haven't been renegotiated, the cash conversion cycle can lengthen quickly – even when the underlying business is performing well.
Tracking all three metrics monthly, and understanding the direction of travel in each, is what separates a reactive cash flow management approach from a proactive one. Working capital for product brands: The practical guide.
How financing affects each metric
Financing is often framed as a last resort – something you turn to when the numbers have already gone wrong. For product businesses managing complex working capital cycles, that framing misses the point.
Used strategically, financing tools interact directly with each metric:
Invoice financing and DSO. Advancing outstanding invoices effectively reduces your cash DSO to near zero, regardless of what customers are actually paying. Your operational DSO – the number that appears in your accounts – stays the same. But your cash position reflects payment almost immediately. The practical effect is that you can extend retail payment terms to win larger accounts without it costing you liquidity.
Inventory financing and DPO. Financing supplier payments – whether upfront deposits or full invoice amounts – extends the cash outflow without changing the supplier relationship. The supplier is paid on time. Your effective DPO, from a cash perspective, is extended by the financing term. This is particularly relevant for brands dealing with manufacturers who require payment before production starts, where traditional DPO negotiation isn't available.
Inventory financing and inventory days. When cash isn't the constraint, inventory decisions can be made on commercial merit rather than liquidity pressure. Brands using inventory financing can place larger, more strategic orders – reducing unit costs, meeting retailer minimums, and planning further ahead – without the working capital position forcing a more conservative approach.
The key is using financing as a planned tool rather than an emergency measure. Finance teams that model their cash conversion cycle, identify where the gaps are, and build financing into the plan before the gap appears are in a fundamentally better position than those who reach for it under pressure.
How this can play out in real life
A wholesale brand has the following metrics:
Inventory days: 75
DSO: 80
DPO: 35
Cash conversion cycle: 75 + 80 − 35 = 120 days
The finance team identifies three initiatives:
Tighten AP process to use full supplier terms – effective DPO moves from 35 to 50 days
Introduce invoice financing for key retail accounts – cash DSO reduces to 15 days
SKU rationalization removes slowest 20% of range – inventory days reduce to 65
New metrics: 65 + 15 − 50 = 30 days
That's a 90-day improvement in the cash conversion cycle. On a $3 million annual COGS base, that frees up approximately $740,000 in working capital – capital that was already inside the business, just not available.
Not every initiative will move as far as this example, and some take longer than others to implement. But the directional point holds: these three levers, pulled together, have a compounding effect that's worth modeling explicitly.
Summary
DSO, DPO, and inventory days are the operational metrics that determine how much working capital a product business needs to function. They're not just accounting outputs – they're active levers that finance teams can influence through process improvements, commercial negotiations, and strategic use of financing tools.
Managing them well doesn't require a transformation program. It requires visibility, a clear model of how they interact, and a plan for each one. The brands that do this consistently find that working capital stops being a constraint on growth and becomes a source of competitive advantage – the ability to move faster, take on larger orders, and say yes to opportunities that cash-constrained competitors can't.
About Treyd
Treyd is working capital built for product businesses. We help fast-growing brands, wholesalers, and distributors close the gap between paying suppliers and getting paid by customers – so cash flow stops being the thing that slows you down.
Buy first, pay suppliers later. Advance your customer invoices. No collateral, no lengthy bank process – just a simple, human experience built around how product businesses actually work.
Over 1500 brands trust Treyd to fund their growth. See how at treyd.io/customers →
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