Unbilled Revenue Explained: Revenue Booked Before Invoice

A company reports ₹1,000 crore of revenue.

But part of that revenue has not yet been invoiced.

How can revenue exist before a bill is raised?

In many project and service contracts, revenue recognition and billing happen at different stages.

Under Ind AS 115, revenue is recognised when the relevant performance obligation is satisfied under the contract. Billing, however, may depend on a separate milestone, certification or contractual condition.

If the company has transferred goods or services but its right to payment is still conditional on something other than the passage of time, the amount is generally a contract asset.

Companies may use descriptions such as “unbilled revenue” for amounts with similar economics, although the exact presentation and terminology can differ by company.

For investors, the key question is:

How quickly does recognised but unbilled revenue convert into invoices, receivables and cash?

A Simple Example

An engineering company has a ₹100 crore contract.

By March 31, it has completed work that allows it to recognise ₹40 crore of revenue under the contract.

But the next billing milestone is reached only after additional testing.

Suppose the company has invoiced only ₹25 crore.

The remaining ₹15 crore may appear as a contract asset / unbilled amount if the company’s right to consideration is still conditional.

The company can therefore show:

Revenue recognised: ₹40 crore Amount billed: ₹25 crore Unbilled / contract asset: ₹15 crore

Revenue is not the same as invoice value.

Invoice value is not the same as cash collected.

Why Revenue Can Be Recognised Before Billing

The timing difference can arise because contracts contain separate:

• Performance obligations
• Billing milestones
• Certification requirements
• Customer approvals
• Measurement stages
• Testing requirements

This is especially relevant in:

• EPC
• Infrastructure
• Defence
• Engineering
• IT services
• Software implementation
• Construction
• Long-term service contracts

The existence of unbilled revenue is therefore not automatically unusual.

Ind AS 115: Contract Asset vs Receivable

The accounting distinction is important.

Ind AS 115 says a contract asset arises when the entity has transferred goods or services but its right to consideration remains conditional.

A receivable exists when the right to consideration is unconditional, meaning only the passage of time is required before payment becomes due.

So the economic sequence can look like:

Work performed → Contract asset / unbilled amount → Invoice / receivable → Cash

Not every company will use exactly the same labels.

But the conditional vs unconditional distinction is central.

Read Credivant’s full guide on contract asset vs trade receivable for the accounting difference.

Unbilled Revenue Is Not Automatically a Red Flag

A fast-growing project business may naturally accumulate contract assets.

Suppose execution accelerates near year-end but contractual billing happens after customer certification in April.

The March balance can look high even if invoices are raised soon after year-end.

This can be normal.

The problem begins when unbilled balances:

• Grow much faster than revenue
• Stay high for years
• Repeatedly fail to convert into invoices
• Coincide with weak cash flow
• Require frequent write-downs
• Depend on disputed milestones
• Become a large portion of net worth

The Most Important Question: Conversion

Investors should not only ask:

“How much unbilled revenue exists?”

Ask:

“How old is it and how quickly does it become billable?”

A company with ₹500 crore of unbilled revenue that converts rapidly after certification may be very different from a company carrying the same balance for several years.

Unfortunately, companies do not always disclose a perfect ageing schedule for every contract-asset category.

That makes management commentary and year-on-year movement important.

Compare Unbilled Revenue With Total Revenue

A useful ratio is:

Unbilled Revenue ÷ Annual Revenue × 100

Example:

Unbilled revenue = ₹300 crore Annual revenue = ₹2,000 crore

Ratio = 15%

Now track the same ratio over time.

This does not prove a problem.

It tells you that a larger part of recognised revenue is sitting before the normal receivable stage.

Connect It With Operating Cash Flow

Contract assets do not themselves equal cash.

If unbilled revenue grows sharply, operating cash flow can remain weak even while revenue and PAT rise.

This is why Credivant’s guide on profit up but cash flow down is directly relevant.

A company can report strong accounting earnings while cash is tied up in:

• Contract assets

• Receivables
• Inventory
• Retention money

The business may then require more working-capital borrowing.

Unbilled Revenue vs Trade Receivables

They are not the same.

Once the company has an unconditional right to consideration, the amount generally moves toward receivables rather than remaining a contract asset.

Unbilled Revenue vs Retention Money

These are also different.

Retention money is typically an amount deliberately withheld by a customer under contract until conditions such as:

• Completion
• Commissioning
• Performance testing
• Defect-liability period

are satisfied.

Unbilled revenue generally relates to recognised revenue that has not yet reached the invoice stage.

Credivant’s retention-money guide explains the difference in project businesses.

Unbilled Revenue vs Customer Advances

Customer advances are almost the opposite economic situation.

Unbilled revenue / contract asset

The company has performed more than it has billed or become unconditionally entitled to bill.

Contract liability / customer advance

The customer has paid or owes consideration before the company has fully performed.

So one can consume working capital while the other can fund it.

Why Project Businesses Can Become Cash Hungry

Consider:

A total of ₹900 crore is tied up across different stages of the billing and collection cycle.

The company may still be profitable.

But it needs cash to:

• Pay employees
• Buy materials
• Pay subcontractors
• Fund new projects
• Service debt

This is why growth can increase financing needs even when PAT looks strong.

Contract Assets Also Carry Expected Credit Loss

Ind AS 115 requires contract assets to be assessed for impairment under Ind AS 109.

So investors should not assume that an unbilled amount has no credit risk simply because an invoice has not yet been issued.

Credivant’s Expected Credit Loss guide explains how ECL can apply to both receivables and contract assets.

What to Search in an Annual Report

Search for:

“Unbilled revenue”

“Contract assets”

“Revenue in excess of billings”

“Unbilled receivables”

“Amounts due from customers”

Then check:

• Current vs non-current classification
• Year-on-year growth
• Contract-asset additions
• Transfers to receivables
• Impairment / ECL
• Management explanation
• Customer concentration
• Working-capital discussion

The terminology can vary, so do not search only one phrase.

A Useful Warning Combination

This pattern deserves deeper investigation:

• Revenue rising quickly
• PAT rising
• Unbilled revenue rising even faster
• Receivables also rising
• Operating cash flow weak
• Borrowings rising

It does not prove aggressive accounting.

But it means more reported revenue is waiting to move through the billing and collection cycle.

Credivant’s trade receivables growing faster than sales article covers the next stage of that cycle.

What Good Disclosure Looks Like

Useful disclosures help investors understand:

• What creates contract assets
• Typical billing milestones
• How balances convert
• Whether large amounts are linked to specific contracts
• Whether customers are government or private
• How much ECL is recognised
• Why current balances increased

The less visibility investors have, the more cautious they should be about assuming that every rupee will convert quickly.

Bottom Line

Unbilled revenue is not automatically suspicious.

In many legitimate project and service businesses, revenue recognition and billing simply occur at different times.

The key is conversion.

A strong business should eventually move recognised work through:

Contract asset → Receivable → Cash

When that chain keeps slowing, investors should investigate working capital, customer quality, billing milestones and ECL.

Disclaimer: This article is for educational and informational purposes only and is not investment advice or a recommendation to buy, sell or hold any security.