What is a statement of work (SOW)?
By Diljit Ramachandran, founder of The Invoice Generator. Published Oct 26, 2026.
A statement of work, or SOW, is a document that spells out the work to be done for a client: what you will deliver, by when, at what price, and how it will be accepted. It often sits under a main contract and is the reference your invoices should match.
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What does a statement of work include?
A scope of work, the list of work to be done, is one part of a SOW; people sometimes use the two terms interchangeably. A SOW covers:
- The scope of work
- The deliverables
- A timeline with milestones
- The price or rate
- How and when you will invoice
- What counts as accepted, and what is out of scope
Why does a SOW matter for invoicing?
Unclear work is a common cause of money disputes. When the SOW says what is delivered at each milestone and what it costs, each invoice is a simple match: the milestone, the agreed amount and the due date. Add the payment terms too. For staged jobs see progress billing.
What does a simple SOW look like?
Example only. Project: website redesign. Deliverables: five page designs and a build. Price: 4,000, paid 2,000 on design approval (15 April) and 2,000 on launch (30 May). Acceptance: client signs off in writing within 5 days. Extra pages are quoted separately. A longer statement of work example follows the same structure.
SOW, quote or contract: which do you need?
A quote prices the work before it starts. A contract sets the legal terms. A SOW defines the work in detail and often attaches to a contract, though a signed SOW can itself be binding. Small jobs may need only a quote; larger projects usually need a SOW. See what to put on an invoice.
Questions
- Who writes the statement of work?
- Either side can draft it. In freelance work it is usually the provider; in procurement the buyer often does. Both sides usually sign it.
- Can a SOW be changed?
- Yes, when both sides agree. Record the change in writing and invoice at the new price.
Keep every document in one place
- A free account saves a copy of each invoice, remembers your clients and items, and shows what is paid and overdue.
- Pro numbers your invoices for you, emails payment reminders, and repeats the ones you send every month.
Drafted with AI assistance from public sources and our own tool, and published by Diljit Ramachandran. It has not been checked by an accountant. It is general information, not tax or legal advice. Rules differ by place; check with an accountant or your local tax office.