Working capital management guide: How to calculate and build an action plan to improve it

Working capital management is the discipline of balancing accounts receivable (AR), accounts payable (AP) and inventory to fund operations without over-borrowing or straining vendor relationships. Without it, a monthly working capital summary can look healthy while AR ages, inventory piles up and payables get pushed to hit a target.

If your team is running working capital on a monthly summary that doesn’t tell you what to actually do next, this guide walks through the three drivers you can move, how they get stuck when your enterprise resource planning (ERP) system is NetSuite and what changes when the whole cycle runs on the same data.

Key highlights

• Working capital management is the discipline of balancing AR, AP and inventory so a business can fund operations without unnecessary borrowing or vendor damage.
• The three real drivers are DSO on the receivables side, DPO on the payables side and DIO on inventory – each gets stuck in specific ways when your ERP is NetSuite.
• The Hackett Group’s 2025 U.S. Working Capital Survey found $1.7 trillion trapped in excess working capital across the top 1,000 U.S. public companies, with an 18-day DSO gap between top and median performers.
• Zone’s AP and treasury platform solutions deliver working capital improvements inside NetSuite with no sync layer, one audit trail and a shorter cash cycle.

What is working capital management?

Working capital management is the discipline of balancing current assets and current liabilities so a business has the cash it needs to operate, without borrowing more than necessary and without straining vendor or customer relationships. The three parts are receivables (how fast customers pay), payables (how the business pays vendors) and inventory (how much stock is sitting on the balance sheet).

In a normal quarter, a NetSuite finance team running working capital management might look like this:

1. The controller reviews days sales outstanding (DSO) by customer segment and flags the top 10 aged accounts to the collections lead.
2. The AP manager scans the payables run for early-payment discount opportunities and pushes low-priority payments to the next cycle.
3. The operations team gets a report on slow-moving SKUs and adjusts safety stock.

All three drivers move in the same month, and the impact shows up in the cash conversion cycle (CCC). When any one of them stalls, working capital lengthens.

What are the three parts of working capital?

Working capital has three operating parts: accounts receivable, accounts payable and inventory. Each has its own metric, its own owner and its own risks of bottlenecks inside NetSuite.

Accounts receivable optimization

Accounts receivable optimization is the work of collecting cash from customers faster without damaging the relationship. The primary metric is DSO, and the three drivers are credit policy at the front end, invoicing accuracy in the middle and dunning cadence at the back end. The Hackett Group’s research found that accounts receivable is the largest share of excess working capital among companies – valued at $600 billion – driven by an 18-day DSO gap between top and median performers.

Cash application matters, too. An invoice paid but not applied to the customer record still shows as open AR and blocks the next order. In NetSuite environments, the common failures are invoices generated late because usage or contract data is scattered, cash applied manually by an AR clerk pattern-matching against remittance emails and collections triggered from a spreadsheet instead of the ledger. 

Accounts payable strategy

Accounts payable strategy is the work of extending days payable outstanding (DPO) to hold cash longer without triggering vendor escalations, late fees or supply disruptions. The work is paying on the right cadence, capturing early-payment discounts when they beat the cost of capital and cutting rushed one-off payments that break the batch. In NetSuite, AP typically gets stuck between invoice capture, approval routing and payment execution.

Every hour an invoice spends waiting in an inbox or approval queue is an hour that could have been added to DPO on purpose. When AP moves slowly, finance stops choosing when to pay and whoever holds the invoice longest makes that choice by default. And every payment rushed at month-end has a specific cost. It might be the early-payment discount that would have beaten the cost of capital, the negotiated term extension left on the table or the supplier relationship that would have flexed the next time cash got tight.

Inventory management

Inventory management is the work of holding just enough stock to serve demand without tying up cash in slow-moving or obsolete SKUs. The metric is days inventory outstanding (DIO), and the drivers are forecasting accuracy, safety stock policy and obsolescence write-off discipline. KPMG's analysis of U.S. public companies shows DIO rose from 73 days in 2020 to 80 days in 2024, indicating persistent inventory holding challenges. Inside NetSuite, inventory data is usually clean at the transactional level but hard to synthesize across categories, warehouses and entities without saved searches that break every time the schema changes. The finance and operations owners see different numbers on Monday morning and spend half the meeting reconciling before they can decide.

How is working capital management different from cash flow management?

Working capital management is a structural discipline focused on the balance sheet – AR, AP and inventory – over quarters and years. Cash flow management is an operational discipline focused on timing – when cash comes in and goes out – over weeks and months. Both matter, they overlap and the same team often owns them, but the metrics, decisions and cadences are different.

How do you calculate working capital, and why does the number lie?

Working capital is calculated as current assets minus current liabilities. The formula is deceptively simple, which is why a healthy working capital number can hide problems.

But the number you get can be deceptive in a few ways: 

1. Current assets include AR that may be aging or uncollectible. The balance sheet doesn’t distinguish between a receivable 30 days old and one 90 days old, so a top 10 account list that has quietly shifted 12 days to the right shows up nowhere in the headline number. 
2. Current assets include inventory at cost. The balance sheet doesn’t flag obsolescence until write-off time, so a product line sitting on 90 days of excess stock still counts at full value.
3. Current liabilities include AP that could have been paid strategically for discount or held longer without penalty. The number reveals nothing about the timing decisions behind it, so a payables run pushed into next month to hit a target reads exactly the same as a payables run timed to capture early-payment discounts.

Put those three together and a business showing $10 million of working capital where the AR is aging, the inventory is stale and payables are being rushed is in worse shape than a business with $6 million of clean, well-timed working capital.

A better measurement may be the cash conversion cycle:

It reflects how many days pass between paying for inventory and collecting cash from a customer, which is what actually drives operating liquidity.

How to tell if your working capital number is lying to you

The working capital calculation doesn’t distinguish between AR that’s aging and AR that’s fresh, or between inventory that’s turning and inventory that’s obsolete. Here are the red flags that suggest the number on your balance sheet is hiding the real picture:

• Your DSO has moved by more than three days over the last two quarters, but the working capital number on your management report hasn't moved.
• Your top 10 aged AR accounts represent more than 25% of total receivables, and none are in a scheduled dunning workflow.
• Your inventory turnover ratio has dropped year over year while inventory dollars on the balance sheet have grown.
• You've had at least one AP payment run pushed to hit a working capital target in the last two quarters.
• Your AR aging report and your general ledger (GL) receivables balance disagree by more than 1%.
• You can't produce a cash conversion cycle number for the current quarter in under an hour.

If more than two of these are true, the working capital number is telling a shorter story than the operating reality – and the fix starts with getting AR, AP and inventory data into one system that reflects what's actually happening.

Interactive tool: Build your working capital management action plan

How do you improve working capital in NetSuite?

Improving working capital in NetSuite comes down to shortening the cash conversion cycle across all three drivers, in the order the finance team can actually move them. The steps below are sequenced by speed to impact.

1. Fix AR days first

Fix AR first because it’s the fastest to move on working capital and the one most directly under finance’s control. Every day cut from DSO is a day of working capital freed for other uses. Here are some ways to improve AR days:

• Generate customer invoices automatically so no revenue sits waiting for a manual invoice generation step
• Automate cash application that matches customer payments to open AR without an AR clerk decoding remittance emails
• Implement a dunning workflow triggered from the ledger, not a spreadsheet.

2. Automate the AP approval cycle

Automate the AP approval cycle so that DPO becomes a decision, not a byproduct of how slowly invoices move through the business. With manual AP, invoices sit in inboxes waiting for approval, which locks the business into whichever payment date the delay produces, and rushed payments at month-end blow past discount windows.

Here are some tips for improving AP: 

• Match invoices to POs and receipts at intake so exceptions surface with weeks of runway to fix them, not hours before a payment run
• Route approvals dynamically by GL, department and threshold so a bill doesn't wait on an approver who's out of office
• Time payment runs to hit early-payment discount windows so DPO becomes a treasury decision, not a calendar default

3. Get a timely cash view

Get a timely cash view so working capital decisions run on current data instead of last Friday's spreadsheet. A working capital decision made without knowing today's cash position is a guess. Here are some ways to improve cash visibility:

• Connect bank feeds directly to NetSuite so today's cash balance reflects what actually cleared, not last Friday's download
• Reconcile daily instead of monthly so drift surfaces with hours to fix, not at close
• Consolidate cash positions across every account, entity and currency into one timestamped view so leadership sees the same cash number the controller does

4. Use liquidity data to drive working capital decisions

Use liquidity data to drive working capital decisions, not just report on them. Once cash is reconciled and positioned in one place, the working capital review stops being a backward-looking report and starts being a forward-looking operating decision. Here are some ways to use it:

• Model what-if scenarios (delaying a receivable, accelerating a payment, drawing on a credit line) against reconciled data before committing
• Build a rolling forward view that refreshes as AR, AP and bank balances move so the forecast doesn't age between manual pulls
• Track how each driver actually moved the number quarter over quarter so next quarter's plan starts from evidence, not intuition

‍Where finance teams overcorrect on working capital management

Working capital targets create incentives that don’t always align with the health of the business. Three common overcorrections show up when finance teams push too hard on a single driver.

1. Finance teams often stretch DPO past the point where vendors notice. DPO extension works until it starts costing more than it saves. Late fees, lost early-payment discounts and delayed shipments from stressed vendors can quietly consume the working capital gain. The right ceiling on DPO is the point where the next day of extension triggers a vendor call, not the point where the balance sheet looks best.
2. Reducing DIO below the operational floor. Cutting inventory improves working capital on paper, but understocking a fast-moving SKU can cost a large customer. Inventory reductions without a matched change in forecasting accuracy just move the problem to lost revenue.
3. Chasing DSO without diagnosing the root cause. Aggressive dunning on slow-paying customers can accelerate short-term cash without addressing why they're slow. If the invoice is going to the wrong contact, arriving with the wrong PO number or missing the required backup, the dunning workflow won't fix it. The DSO problem is upstream.

‍Get intelligent working capital management solutions inside NetSuite

Working capital management is about balancing its inputs – DPO, DIO and DSO – without adding more manual tasks to your team’s plate. Zone helps teams manage working capital and optimize AP days and days sales outstanding with an underlying foundation of data and cash visibility inside NetSuite, where your team already operates. 

Core capabilities finance teams get with Zone:

• Invoice on the day revenue is earned, and apply cash the day it lands. ZoneBilling generates subscription, AI usage and contract billing directly from NetSuite records, and automatically delivers invoices to customers to reduce DSO.
• Turn AP into a controlled workflow. ZoneCapture pulls invoice data with GenAI extraction, ZoneApprovals routes bills dynamically by GL, department and threshold and Zone AP Payments executes multi-currency batches without leaving NetSuite.
• Base cash decisions on live data. ZoneReconcile pulls bank data and matches transactions automatically, and ZoneLiquidity – coming soon – delivers a consolidated position across accounts and currencies with a timely cash view.

Zone & Co strategically uses AI to research and draft articles, but the final version is shaped by people. Our team carefully reviews content with multiple human-in-the-loop steps in the process to ensure accuracy, relevance, tone and alignment with readers’ interests.