Professional Invoices & Proposals for Consultants
Bill your expertise with confidence — clear invoices and proposals that reflect the value you deliver to clients.
Consulting engagements range from one-off strategy sessions to long-term retainers. OwnedWork gives you the flexibility to invoice hourly, per project, or on a recurring basis. Create polished proposals that win engagements, then convert them into invoices when the work is done.
The Document Headache for Consultants
How OwnedWork Helps
Flexible Billing Models
Invoice by the hour, by the project, or on a monthly retainer. OwnedWork adapts to however you structure your consulting fees.
Recurring Invoices
Set up monthly retainer invoices that generate automatically. Adjust the scope description each month to reflect work delivered.
Expense Line Items
Add travel, accommodation, and other expenses as separate line items on your invoice. Keep consulting fees and expenses clearly separated.
Professional Proposals
Win new engagements with proposals that outline your approach, deliverables, timeline, and fees. Share via link or export as a branded PDF.
Receipt Generation
Issue receipts for every payment received. Maintain clean financial records for your accountant and HMRC.
Example Invoice for Consultants
How to Invoice as a Consultant
Consulting invoices should clearly state the engagement, the period covered, and the work delivered. Whether you bill hourly or on a fixed-fee basis, your client needs to see exactly what they are paying for.
Include your business details, invoice number, payment terms (typically 14 or 30 days), and bank details. If you are billing expenses alongside your fee, list them as separate line items for transparency.
OwnedWork generates professional invoices in seconds. For a complete guide to writing invoices, see our invoicing guide.
Managing Retainer Invoicing for Consultants
Retainer billing requires consistency. Send your invoice on the same date each month with a clear description of the work delivered during that period. This builds trust and avoids disputes about what was covered.
With OwnedWork's recurring invoice feature, you can automate monthly retainer billing. Adjust the description each month to reflect specific deliverables — strategy calls, reports, or workshops attended.
Tip: Include a brief summary of hours or deliverables on each retainer invoice. Even on fixed-fee retainers, this demonstrates the value you are providing and reduces the risk of scope disagreements.
Writing Consulting Proposals That Convert
A winning consulting proposal demonstrates your understanding of the client's challenge before jumping to pricing. Start with a summary of the brief, outline your methodology, and specify deliverables and timelines.
Be explicit about what is included and what is not. If the engagement is time-bound, state the number of days or hours. If it is outcome-based, define the deliverables clearly.
- Open with the client's problem and your understanding of it
- Outline your approach and methodology
- Break fees into phases or milestones
- Include terms, payment schedule, and validity period
Frequently Asked Questions
Should I invoice hourly or per project as a consultant?
It depends on the engagement. Hourly billing suits ongoing advisory work, while fixed-fee pricing works better for defined projects with clear deliverables. Many consultants use a blend of both.
How do I bill expenses alongside my consulting fee?
Add expenses as separate line items on your invoice. Include a brief description (e.g. train to London, hotel 2 nights) and the amount. OwnedWork keeps fees and expenses clearly separated.
What payment terms should I set for consulting invoices?
14 days is common for smaller clients, while 30 days is typical for corporate engagements. Always agree terms in your proposal before starting work.
Can I convert a proposal into an invoice?
Yes. OwnedWork lets you convert an accepted proposal into an invoice with a single click, carrying over the line items, rates, and client details.
How do I handle retainer billing in OwnedWork?
Set up a recurring invoice with your retainer fee and billing cycle. OwnedWork generates the invoice automatically each month — just review and send.
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