Thai tax invoices, PromptPay payments & 50 Bis — all in one app

No — BillsOS never holds your money. When a client pays by PromptPay, the funds go straight into your own bank account; the money never passes through BillsOS, and we take no cut or fee on what your clients pay you. Every bill generates a PromptPay QR with the exact amount already filled in, so clients scan and pay the precise sum instead of typing it themselves. That reduces wrong-amount transfers and lowers the risk of fake or doctored payment slips. You stay in full control of your cash flow from the first bill onward.

Yes — BillsOS tax invoices, receipts, and withholding-tax certificates (50 Bis) follow the format the Revenue Department (กรมสรรพากร) requires. You can issue both full tax invoices and short-form (abbreviated) tax invoices, depending on what your business needs. The system lays out the legally required fields for you, but you remain responsible for entering the correct details — names, addresses, and tax ID numbers. Please note that BillsOS is a document-generation tool: it does not file your taxes for you and does not provide tax advice. If you are unsure about your obligations, check with your accountant or the Revenue Department.

Not required — BillsOS works for both VAT-registered and non-registered businesses. You simply flip a VAT toggle to match your status, and when it's on, the system calculates and shows VAT on your documents automatically. If your business is below the threshold, leave VAT off and issue bills as usual. As helpful context: under Thai law, businesses with revenue above ฿1.8 million per year are generally required to register for VAT. So if your turnover is near or above that level, it's worth checking with the Revenue Department or your accountant about whether registration is mandatory for you.

Yes — BillsOS has no lock-in contract and no minimum commitment, so you can cancel a paid plan anytime from your account settings. You can start on the free plan with no credit card and upgrade only when your business is ready and needs more features. When you cancel, your paid-plan features stay active until the end of the billing period you have already paid for; after that, the account simply drops back to the free plan. Your existing data and documents remain in place, so you can try BillsOS without worrying about being tied in for the long term.