For Thai freelancers

Invoicing software for freelancers with automatic withholding tax

Create quotations, invoices, receipts, and tax invoices with 3% withholding tax calculated automatically. Ditch Excel, track unpaid invoices, and accept payments via PromptPay QR — all in one place.

Free 15 docs / 30 days. No credit card required.

Common freelancer pain points

Withholding tax math errors

Manual Excel calculations lead to mismatched take-home amounts. Flowly auto-computes 3% WHT on every invoice.

Documents scattered everywhere

Quotations in Word, invoices in Excel, receipts handwritten — bring them all into one searchable system.

Forgetting to chase payments

Too busy to remember who still owes you. Flowly flags overdue invoices and sends reminder emails automatically.

Features freelancers actually use

Built for solo freelancers without an accounting team.

  • Turn a quotation into an invoice, then into a receipt in one click
  • Auto-compute 3% withholding tax — both 40(2) and 40(8) income categories
  • Recurring invoices for retainer clients — set once, auto-issued every month or week
  • PromptPay QR on every document for fast client payment
  • Three polished PDF templates ready to send
  • Annual tax report to simplify Thai PND 90/91 filing
  • LINE notification when a client pays

Freelancer FAQ

I'm not VAT-registered. Can I still use Flowly?

Yes. Flowly supports both non-VAT freelancers and VAT-registered businesses. The system adjusts based on your workspace settings.

Does it really calculate 3% withholding tax?

Yes. Enable withholding tax per invoice and Flowly separates net, withheld amount, and prints them on the document. Choose 40(2) or 40(8) income category.

How do I send invoices to clients?

Download PDF for email/LINE, or share a public link — clients view the invoice in-browser without signing up.

I work with many clients. Can I save them for reuse?

Yes. Clients and products/services are saved. Creating the next invoice takes just a few clicks.

Send your first invoice in 2 minutes

Free, no credit card, full feature trial.

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