Agency Work in Progress: How to Account for Unfinished Jobs

Key takeaways

• Agency work in progress is work you've done but haven't billed yet. It's a crucial asset on your balance sheet that shows your true financial position.
• You must value WIP to see accurate monthly profits. Ignoring it makes your profit look lower in busy months and higher in quiet ones, hiding real performance.
• The simplest method is to value WIP at cost. Add up the hours your team has worked on unbilled jobs and multiply by their pay rates.
• Good WIP accounting improves cash flow forecasting. It tells you exactly how much revenue is about to hit your bank account from work already completed.
• Regular WIP reviews prevent scope creep and underpricing. Tracking unbilled work helps you spot projects running over budget before it's too late.

What is agency work in progress in simple terms?

Agency work in progress, often called WIP, is the value of work your team has completed for clients but you haven't invoiced yet. Think of it as finished goods sitting in a warehouse that haven't been sold. For a marketing agency, this could be a website build that's 80% done, a month's worth of social media content created but not billed, or strategy work delivered before the retainer invoice date.

This unbilled work is a real asset to your business. You've already spent money on salaries and software to create it. Proper agency work in progress accounting means putting a value on this asset in your financial records. This stops your profit figures from being misleading.

Without tracking WIP, your profit and loss report only shows billed revenue. In a busy month where you do lots of work but bill little, your profit looks artificially low. In a quiet month where you invoice for past work, your profit looks artificially high. Tracking WIP smooths this out to show your true performance.

Why is accounting for agency work in progress so important?

Accounting for agency work in progress gives you an accurate picture of your profitability and financial health. It turns your management accounts from a simple record of cash in and out into a powerful tool for decision-making. You can see if you're actually making money on each project as it progresses, not just when the invoice is paid.

Most agencies we work with initially see WIP accounting as a compliance task. They quickly realise it's a commercial necessity. When you value your unbilled work, you understand your agency's real worth. Your balance sheet shows all your assets, including the intellectual property and labour you've invested in client projects.

This accuracy is vital for pricing and planning. If you only look at billed revenue, you might think you have a cash flow gap. In reality, you might have £50,000 of agency work in progress ready to invoice. Knowing this helps you plan payments, invest in growth, and negotiate with suppliers from a position of strength.

How do you calculate the value of your agency's WIP?

You calculate agency work in progress by adding up the costs you've incurred on unbilled client projects. The most common and straightforward method is the "cost basis" approach. You track the hours your team has spent on each job that hasn't been invoiced, then multiply those hours by what it costs you to employ them.

Here's a simple formula: (Team hours worked x their cost rate) + direct project expenses. Your team's cost rate isn't just their salary. It includes employer National Insurance, pension contributions, software subscriptions, and a portion of office costs. A typical fully-loaded cost rate for a mid-level marketer might be 1.3 to 1.5 times their base salary.

For example, if a designer (cost: £40/hour) has spent 15 hours on an unbilled branding project, and a strategist (cost: £60/hour) has spent 10 hours, your WIP value is (15 x £40) + (10 x £60) = £1,200. This £1,200 is an asset. You've spent that money, and you'll recover it when you invoice the client.

Some agencies use more complex methods, like percentage of completion. This estimates the value based on how much of the project is done. The cost method is simpler and less subjective, making it better for most marketing agencies. Specialist accountants for digital marketing agencies can help you set up the right system.

What does WIP accounting look like in your bookkeeping?

In your bookkeeping, agency work in progress appears as a current asset on your balance sheet. When you incur costs for an unbilled project, you don't put them straight to your profit and loss as expenses. Instead, you "capitalise" them by creating a WIP asset. This moves the cost from your P&L to your balance sheet temporarily.

Here's the journal entry: Debit "Work in Progress Asset", Credit "Salaries" or "Direct Costs". This keeps the cost off your P&L for now. When you finally raise the invoice to the client, you reverse this. You debit "Accounts Receivable" for the invoice amount, credit "Revenue", and then move the cost from the WIP asset to your "Cost of Sales" on the P&L.

This process matches the revenue with the cost of earning it in the same accounting period. It's called the matching principle. Your accounting software like Xero or QuickBooks can handle this with the right setup. You create a tracking category for each project and assign all time and costs to it.

The key is consistency. Do the same calculation every month. Review your WIP valuation regularly, ideally as part of your monthly management accounts process. This turns raw data into actionable insight about which projects are profitable and which are eating your margin.

What are the biggest mistakes agencies make with WIP valuation?

The biggest mistake is ignoring agency work in progress completely. Many agency founders run their business from their bank balance and billed revenue. This creates a rollercoaster of apparent profitability that makes planning impossible. You think you're having a terrible month when you're actually building valuable assets.

Another common error is inconsistent valuation. You might track time one month but not the next, or use different cost rates for different team members without reason. This makes your financial reports unreliable. Your WIP valuation should follow a clear, documented policy that you apply to every project.

Underestimating true costs is a major pitfall. If you value WIP at just raw salary cost, you're missing the full picture. Your true cost includes all employment overheads. If your fully-loaded cost is 30% higher than base salary, valuing WIP at salary understates your asset and overstates your monthly profit.

Finally, agencies often forget to write down worthless WIP. If a project has gone over budget with no chance of extra client payment, the WIP asset is impaired. The cost you've incurred won't be recovered. You need to write it down, moving it from the balance sheet to the P&L as a loss. Facing this quickly prevents bigger problems.

How can WIP data improve your agency's pricing and profitability?

Your agency work in progress data is a goldmine for pricing decisions. By tracking the actual cost of delivering work before you invoice, you see your real gross margin on each project type. You can compare this to your target margin and adjust your pricing model accordingly.

For example, you might price website builds at a fixed £15,000. Your WIP tracking shows the average cost to deliver is £11,000, giving a 27% gross margin. If your target is 50%, you know you're underpricing. You can increase your price, reduce your costs, or stop offering that service.

WIP analysis also reveals scope creep in real time. If a £10,000 project has £9,000 of costs recorded against it in WIP and is only 70% complete, you have a problem. You can have a conversation with the client about additional fees before you complete the work, protecting your margin.

This level of insight transforms your commercial strategy. You can identify which services, which clients, and which team members are most profitable. You can make informed decisions about where to focus your business development efforts. It moves you from guessing to knowing. Take our free Agency Profit Score to see how your current pricing stacks up.

What's the connection between WIP accounting and agency cash flow?

Agency work in progress accounting is directly linked to cash flow forecasting. Your WIP balance represents future cash inflows. It's work that's done and will be invoiced, so it's highly predictable revenue. By tracking WIP, you can forecast your cash position weeks or months ahead with much greater accuracy.

Look at your WIP report by client and project. You can see which invoices will be raised next week, next month, and next quarter. This helps you plan for tax payments, salary runs, and investment in new hires or software. You're not just looking at what's in the bank today.

This is especially important for agencies with long project cycles or milestone billing. A big website project might have three months of work before the first invoice. Without WIP tracking, those three months look like a cash flow black hole. With it, you can see the value building and plan your finances around the upcoming invoice.

Good WIP management also speeds up cash conversion. By regularly reviewing unbilled work, you identify projects that are complete or ready for a milestone invoice. You can get invoices out faster, reducing the time between doing the work and getting paid. This directly improves your working capital position.

How should different types of marketing agencies handle WIP?

Different agency models need slightly different approaches to agency work in progress accounting. For retainer-based agencies like SEO or social media managers, WIP often builds up throughout the month. You deliver services daily but invoice monthly in arrears. Your WIP value peaks just before your billing run.

For these agencies, WIP tracking ensures each month's profit and loss matches the work done that month, not the cash received. It prevents December (when you might invoice early) from looking amazing and January from looking terrible, when the actual workload was steady.

Project-based agencies, like web design or branding shops, need to track WIP by project phase. Value is built up until key milestones trigger invoices. Your WIP report should show the value against each milestone, helping you manage client conversations about progress and payments.

Performance marketing or PR agencies with success fees face a different challenge. Some of their work may only be billable if certain results are achieved. This requires careful judgement about whether to recognise WIP. Conservative practice suggests only valuing work where payment is virtually certain. Specialist advice is key here.

What tools and systems make WIP accounting easier?

The right tools automate agency work in progress tracking and save you hours of manual calculation. Start with integrated time tracking. Software like Harvest, Clockify, or Toggl Track allows your team to log time against specific projects and clients. This data feeds directly into your WIP calculation.

Your project management tool should connect to your finance system. Platforms like Accelo, Scoro, or FinancialForce are built for service businesses and handle WIP automatically. They create the journal entries in your accounting software based on time and cost entries.

For most agencies, a simpler setup works well: time tracking software plus a capable accounting platform like Xero or QuickBooks Online. Use Xero's Projects feature or QuickBooks' Jobs to allocate costs. You can then run a "Job Profitability" report that essentially shows your WIP and earned revenue.

The goal is to minimise manual spreadsheets. If you're copying and pasting data between systems each month, you're wasting time and risking errors. Automation gives you real-time visibility. You can check your WIP position any day, not just at month-end. This is a game-changer for proactive financial management.

When should you get professional help with WIP accounting?

You should consider professional help when your agency work in progress becomes material to understanding your finances. As a rule of thumb, if your unbilled work at month-end regularly exceeds 10-15% of your monthly revenue, you need a proper system. Ignoring it will significantly distort your profit reports.

Get help if you're struggling to implement a consistent valuation method. A good accountant will help you establish a WIP policy: how you track time, what cost rates to use, and how to record it in your books. This policy ensures your numbers are reliable month after month.

Seek specialist advice if you have complex billing arrangements. This includes milestone payments, success-based fees, or retainers with variable scopes. These scenarios make WIP valuation trickier. An accountant experienced with marketing agencies will know the appropriate accounting standards and practical solutions.

Finally, involve a professional before an audit, sale, or investment round. Potential buyers or investors will scrutinise your WIP valuation. They need confidence that your reported assets are real and recoverable. Clean, well-documented WIP accounting makes your agency more valuable and investable. It shows sophisticated financial management.

Getting your agency work in progress accounting right is a mark of a professionally run agency. It provides clarity, improves decision-making, and builds value. For a tailored view of your agency's financial health, take our free Agency Profit Score. It takes five minutes and gives you a personalised report on your profitability, cash flow, and efficiency.