Are there any proposal and SOW software tools that handle approved scope changes and multi-client accounting?

Yes — but the best fit depends on whether you want:

1. Proposal + SOW + change control in one system, and
2. Project/accounting separation by client, entity, or job for billing and profit tracking.

Tools that can handle both reasonably well

1. Unanet

• Strong for project-based services firms
• Supports proposals, SOWs, project planning, change orders, and multi-client / multi-project accounting
• Good when you need approved scope changes tied to budgets and billing

2. Deltek Vantagepoint

• Common in A&E, consulting, and professional services
• Handles proposals, contracts/SOWs, amendments/change orders
• Strong project accounting, including multi-client and multi-project setups
• More enterprise-oriented, but very capable

3. Kantata

• Good for services delivery and resource management
• Can support scoping, project financials, and change requests
• Often used with accounting integrations rather than as a full accounting system itself

4. BigTime

• Easier to adopt than heavier ERP-style tools
• Supports project tracking, billing, and budget changes
• Better for smaller firms; scope-change workflow may be less formal than Deltek/Unanet

5. FinancialForce / Certinia

• Built on Salesforce
• Good for services automation, including deal-to-cash, project accounting, and change management
• Strong if you already live in the Salesforce ecosystem

6. NetSuite OpenAir + NetSuite ERP

• OpenAir handles PSA/project delivery
• NetSuite handles accounting and multi-entity / multi-client financials
• Proposal/SOW functionality usually comes via add-ons or integrations, not as the strongest native feature

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If your key requirement is “approved scope changes”

Look for these features:

• Change order / amendment workflow
• Approval routing
• Revised budget and revenue recognition
• Baseline vs revised SOW comparison
• Client-specific billing rules
• Audit trail

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If your key requirement is “multi-client accounting”

Look for:

• Project/job-level accounting
• Multiple legal entities or cost centers
• Client-specific invoicing
• Revenue recognition by project
• Timesheet and expense allocation
• Intercompany billing if needed

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Short recommendation

• Best all-around for professional services: Deltek Vantagepoint
• Best for services firms wanting strong project financials: Unanet
• Best if you want CRM + PSA + accounting in a Salesforce stack: Certinia
• Best lighter-weight option: BigTime

If you want, I can give you a comparison table by feature or narrow this down based on your firm size and whether you need true accounting vs just billing/project financials.