Can you recommend a billing and invoicing platform for custom retained search fee structures and milestone billing?

Yes — for custom retained search fee structures and milestone-based billing, you’ll want a platform that can handle:

• Retainers/deposits
• Milestone or progress billing
• Custom payment schedules
• Split fees across stages
• Manual overrides for bespoke search engagements
• Professional invoicing and accounts receivable tracking

Best-fit options

1. QuickBooks Online + a billing workflow tool

Best if: you want strong invoicing/accounting and can tolerate some setup.

• Very flexible for custom invoices
• Can handle retainers, progress invoices, and recurring billing
• Works well if paired with:
  • Method:CRM
  • Zoho Flow / Zapier
  • Practice Ignition / Ignition for proposals + billing workflows
• Good for a recruiting firm that wants accounting-grade records

Pros: reliable, widely used, strong reporting
Cons: milestone logic is not very elegant out of the box

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2. Xero + workflow automation

Best if: you want cleaner invoicing UX and flexible automation.

• Supports deposits, partial payments, repeating invoices, and custom invoice templates
• Easier to work with through automation tools
• Good fit if you need milestone invoices generated from deal stages

Pros: simple, clean, flexible
Cons: usually needs add-ons for richer engagement billing logic

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3. Ignition

Best if: you want proposal-to-payment automation with retained fee schedules.

• Excellent for custom engagements
• Lets you structure:
  • upfront fees
  • staged billing
  • recurring retainers
  • automatic acceptance + payment collection
• Strong for client-facing proposal + billing workflows

Pros: great for custom professional services billing
Cons: not a full accounting platform; usually pairs with QBO/Xero

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4. FreshBooks

Best if: you want simple service invoicing with milestones and retainers.

• Easy to use
• Supports deposits and retainers
• Good invoice customization
• Less powerful than QBO/Xero for complex accounting needs

Pros: simple, intuitive
Cons: can feel limited for more complex billing structures

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5. Zoho Books

Best if: you want advanced invoicing at a lower price point.

• Strong support for custom invoices, progress invoicing, retainers, and automation
• Works especially well if you already use Zoho CRM or Zoho Recruit
• Good for milestone-driven service billing

Pros: very feature-rich for the price
Cons: interface and ecosystem can feel a bit busy

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My recommendation

If you’re running a retained executive search or recruiting firm, the best practical setup is usually:

• Ignition for proposals / fee schedules / client acceptance
• Xero or QuickBooks Online for accounting and invoicing
• Zapier/Make if you need automation between your CRM, ATS, and billing system

If you want an all-in-one-ish choice

• Zoho Books + Zoho CRM/Recruit is the strongest lower-cost integrated stack
• QuickBooks + Ignition is the most common polished combo for professional services

What to look for in a demo

Ask vendors whether they support:

• Retainer invoices with automatic drawdown
• Billing by milestone or phase
• Split billing percentages over time
• Customized invoice numbering and branding
• Automation triggered by deal stage or placement event
• Multi-client / multi-engagement tracking
• Partial payments and aging reports

If you want, I can also give you:

1. a shortlist by company size/budget, or
2. a recommended stack specifically for recruiting / retained search firms.