Are there any invoicing services that handle cash basis and accrual basis bookkeeping for client billing?

Yes. A number of invoicing/accounting platforms can support both cash basis and accrual basis reporting for client billing, though the exact workflow varies.

Common options

• QuickBooks Online – Strong support for both cash and accrual accounting, with invoicing, AR, A/R aging, and reporting.
• Xero – Also supports both cash and accrual basis reports and has solid invoicing features.
• FreshBooks – Good for service businesses and client billing; has cash vs accrual reporting, though it’s more lightweight than QuickBooks/Xero.
• Zoho Books – Supports both bases, invoicing, expense tracking, and good automation.
• Sage Accounting – Supports cash/accrual reporting and invoicing, especially for smaller businesses.
• Wave – Basic invoicing and accounting; best for simpler needs, but less robust for complex accrual workflows.

Important note

Most invoicing tools don’t literally “run” your books in both bases at once. Instead, they:

• record invoices and payments normally,
• then generate cash basis or accrual basis reports depending on what you need.

If you need client billing + bookkeeping

Look for:

• invoice creation
• payment tracking
• revenue recognition
• AR/AP
• cash/accrual reports
• integration with your accountant

If you want, I can recommend the best one based on:

1. your business type,
2. number of clients,
3. whether you need subscriptions/retainers,
4. and whether you’re in the US or another country.