Progress Billing professional & compliant
Learn how to create progress invoices, partial invoices, and final invoices correctly. Secure your cash flow on large projects.
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Progress Billing: Key Facts at a Glance
Partial Payment
Invoice for work already completed on a project
Secure Cash Flow
Regular payments instead of waiting until project end
Sequential Numbering
Each progress invoice needs a unique number
Contract Reference
Clear reference to quote or contract required
Tax Timing
VAT due when invoice is issued, not when paid
Final Invoice
Deduct all progress payments from total at the end
What is Progress Billing?
Progress billing is a method of invoicing where you bill clients in stages as work is completed, rather than waiting until the end of a project to invoice the full amount.
Important: Progress invoices differ from advance payment invoices. While an advance is requested BEFORE work begins, progress invoices are issued for work already completed.
Benefits: Progress billing ensures steady cash flow, reduces financial risk on large projects, and provides clients with transparency on project costs.
Types of Project Billing
Advance Invoice
Issued BEFORE project starts. Client pays a deposit before work begins. Typically: 30% of total.
Cover material costs, secure commitment
Progress Invoice
Issued DURING the project for completed work. Based on percentage of completion or milestones.
Construction, trades, long-term services
Milestone Invoice
Invoice for completed project phases. Has the same legal effect as a final invoice for that portion.
Clearly defined project phases, deliverables
Final Invoice
Complete invoice after project completion. All previous payments are deducted, remaining balance is due.
Project completion, final delivery
Billing Methods: Individual vs. Cumulative
Individual Invoices
Each invoice stands alone and contains only the current work performed.
Vorteile:
- Easier to create
- Clear for few invoices
- Flexible
Nachteile:
- Less overview of total progress
- More complex final invoice
Cumulative Billing
Each invoice shows total progress and deducts previously paid amounts.
Vorteile:
- Full transparency on project status
- Industry standard
- Simpler final invoice
Nachteile:
- More complex to create
- More documentation needed
Required Information on Progress Invoices
- Full name and address of the issuer
- Full name and address of the client
- Tax number or VAT ID of the issuer
- Invoice date
- Unique, sequential invoice number
- Label "Progress Invoice" + number (e.g., "Progress Invoice #1")
- Reference to contract/quote (date, number)
- Description of completed work
- Service period for billed work
- Net amount
- Applicable tax rate
- Tax amount
- Gross amount (total)
Creating Progress Invoices: Step by Step
Follow this guide for compliant progress invoices:
Define payment schedule in quote
Specify in your quote when and how much progress payments are due (e.g., 30% at contract signing, 40% at structural completion, 30% at project end).
Document work progress
Keep verifiable records of project progress: project diary, photos, meeting notes. This protects you in case of disputes.
Create progress invoice
Create the invoice with all required information, label it "Progress Invoice #X" and reference the contract.
List completed work
Describe exactly what work is being billed. For cumulative billing: total progress minus amounts already paid.
Handle VAT correctly
Show VAT on the invoice and report it in your next VAT return (accrual basis).
Create final invoice
After project completion: Total amount minus all progress payments = remaining balance. List all progress invoices individually.
Industries Using Progress Billing
Construction
Building projects, trades
Architecture
Design phases
IT & Software
Development projects, sprints
Agencies
Campaigns, web projects
Consulting
Long-term engagements
Manufacturing
Custom orders, prototypes
Pro Tips for Progress Billing
Define payment schedule
Specify in your quote when and how much progress payments are due.
Document progress
Keep a project log or photos to prove work completion.
Consistent numbering
Use clear labels: "Progress Invoice #1", "Progress Invoice #2", etc.
Consider tax timing
VAT is due when you issue the invoice, not when payment is received.
Frequently Asked Questions About Progress Billing
What is the difference between progress billing and advance payment?
An advance payment invoice is issued BEFORE project start to receive a deposit. A progress invoice is issued DURING the project for work already completed. With advance payment, work has not started yet; with progress billing, you are invoicing completed work.
When is VAT due on a progress invoice?
In most cases, VAT is due when the invoice is issued, not when payment is received. You must report and pay VAT in your next VAT return. This is called accrual basis accounting.
How many progress invoices can I issue?
There is no legal limit. You can issue a progress invoice for each portion of completed work. Monthly billing or billing at defined milestones is common. The key is that actual work has been performed.
What must be included on a progress invoice?
A progress invoice must contain all required invoice elements: sender, recipient, tax number/VAT ID, date, invoice number, service description, net/gross amount, tax rate and amount. Additionally, mark it as "Progress Invoice #X" with reference to the contract.
How do I create the final invoice after progress payments?
In the final invoice, list the total project amount. Below that, list all progress invoices received with number, date, and net amount, then subtract them. The remaining balance plus tax is the final amount due.
What is the difference between individual and cumulative billing?
With individual invoices, each one stands alone. With cumulative billing, each invoice shows total progress and deducts previously paid amounts. Cumulative is standard for construction contracts and provides better overview on large projects.
Can small businesses use progress billing?
Yes, small businesses can use progress billing. If you are VAT exempt, the VAT timing issue does not apply. Just ensure you include any required small business exemption notices on each invoice.
What if a client does not pay a progress invoice?
You can send payment reminders like any other invoice. With continued non-payment, you may stop work as you have a legal right to progress payments. As a last resort, legal action is possible.
Do I have to offer early payment discounts on progress invoices?
No, discounts are voluntary. If you generally offer early payment discounts, you should apply them to progress invoices too. Note the discount terms on each invoice.
How do I number progress invoices correctly?
Each progress invoice needs a unique invoice number from your regular numbering sequence. Additionally, number the progress invoices sequentially: "Progress Invoice #1", "Progress Invoice #2", etc., for clear project tracking.
Is progress billing required for construction contracts?
Not required, but it is standard practice. Contractors have the right to progress payments for completed work. Cumulative billing is common and provides the documentation needed for contract compliance.
What is milestone billing and how does it differ from progress billing?
Milestone billing is for completed project phases and has the same legal effect as a final invoice for that portion (including warranty start). Progress billing refers to general project advancement without final effect.
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