What is a B2B ecosystem?
Business apps that belong to one platform and share the account and the data, instead of being wired together through paid integrations.
Hong Kong · Companies Registry · Business Registration · Profits tax 8.25 % / 16.5 %
Company setup, profits tax, MPF and cross-border business in Hong Kong: what to do at each stage.
Doing business in Hong Kong looks simple on paper: no VAT or GST, a two-tier profits tax, and tax only on Hong Kong-sourced profits. In practice every company has to renew its Business Registration, deliver an annual return, have its accounts audited by a CPA every year and, once it hires, handle MPF contributions and the employer's return. The 4b2b suite offers general online tools alongside (PDF invoices and archive, a financial ERP, HR records, CRM, SMS and e-mail, hosting); it does not connect to the Companies Registry, the IRD or the MPFA.
Explore the topic map →Illustrative overview (not measured data)4B2B · LEDGER VIEW
18
Topics
3
Clusters
0
VAT
Invoicing & receiptsAccountingHR & payrollOther
Illustrative trend (not measured data)
Currency
HKD
Profits tax
8.25 % / 16.5 %
VAT / GST
None
Registry
Companies Registry
Start with the services you can use today
Subscribe online to the first applications of the 4b2b ecosystem, then add more modules to the same account whenever you need them.
Invoicing
Issue and manage invoices online, with plans that start with a free trial period.
from €1 /month
Price monitoring
Track your competitors' prices for your products, with alerts and price recommendations.
from €2 /month
Notifications
Send SMS, e-mail and WhatsApp notifications to your customers from one place.
from €49 /month
What makes Hong Kong different
No VAT, two-tier profits tax, compulsory audit — Hong Kong rules to get right from day one.
Hong Kong's tax system is simple; its administrative calendar is not. The Companies Registry, the Inland Revenue Department and the MPFA each run their own deadlines, and every limited company is audited regardless of size. The 4b2b products do not file anything with the government or connect to its systems; they provide general tools for invoices, books and staff records that you organise yourself for your accountant and auditor.
CR-BRCompanies Registry · Business RegistrationA limited company is incorporated through the Companies Registry e-Registry, with Business Registration applied for at the same time. Afterwards it must deliver an annual return (NAR1) within 42 days of each incorporation anniversary and renew its Business Registration Certificate on time.
PT-2TTwo-tier profits taxCorporations pay 8.25 % on the first HKD 2 million of assessable profits and 16.5 % on the rest; unincorporated businesses pay 7.5 % and 15 %. Under the territorial source principle only Hong Kong-sourced profits are taxed, and offshore claims must be well documented.
NO-VATNo VAT · free portHong Kong levies no VAT, GST or sales tax, and general goods move in and out without customs tariffs. Invoices carry no tax, but every invoice and receipt still underpins the audit and the tax return and has to be kept complete.
MPF-FPSMPF · FPS · HKDEmployers and employees generally each contribute 5 % of relevant income, capped at HKD 30,000 a month. The HKD is pegged to the USD, and FPS lets businesses collect instantly by mobile number, email or FPS ID.
01 · SETTING UP
Setting Up a Company in Hong Kong
Incorporating in Hong Kong is fast, but it is only the start. From the day the Certificate of Incorporation and Business Registration Certificate are issued, the company must keep books, prepare for its audit and watch Companies Registry and IRD deadlines. These six topics walk through each step — and where 4b2b helps.
6 · Open →
02 · OPERATIONS
Operations — Profits Tax, Invoicing, MPF, FPS
The operating rhythm of a Hong Kong company: invoices carry no tax, but the accounts are audited and profits tax is filed every year; once you hire, MPF is due monthly and the employer's return annually. These six topics cover each obligation.
6 · Open →
03 · CROSS-BORDER
Cross-border — Mainland, Greater Bay Area & Overseas
Hong Kong is a free port with a USD-pegged currency and close ties to the Mainland through CEPA — a natural gateway to China and Asia. Cross-border business brings opportunity, and with it multi-currency books, several tax systems and a lot of paperwork.
6 · Open →
How the 4b2b modules fit together for a Hong Kong company
Each product is subscribed and managed on its own brand domain — billing, support and licensing all live there. This view shows the general tools available to a company operating in Hong Kong.
4appointments.netOnline booking and appointment scheduling for service businesses.4buildsite.netWebsite and online-store builder with ready-made templates.4invoices.netInvoicing in 73 countries: PDF invoices, numbering, client records and payment links, with ANAF e-Factura integration in Romania.4notify.netSMS and WhatsApp notifications, with an API to send them from your own applications.4pricing.netPrice comparison: monitor competitors and adjust the prices in your online store.
Built on open standards
REST API, Webhooks, PDF invoices, e-mail and SMS. UBL and ISO 20022 are listed for information only: the ecosystem has no connection to the Companies Registry, the IRD, the MPFA or banks.
Local standards (informational)
UBL 2.1ISO 20022
Integrations
REST APIWebhooksPDF invoicesE-mail and SMS
Infrastructure
Hosting in EU data centres
Built for accounting firms, company secretaries and law firms
Hong Kong accounting and company-secretarial firms typically serve dozens of client companies, each with its own annual return, BR renewal, profits tax return and audit timetable. The ecosystem includes a multi-company financial ERP; the filings themselves are made with the Companies Registry, the IRD and the MPFA.
Accounting firms
Keep each client’s books in a multi-company financial ERP and invoices as PDFs in an archive. Share documents with the auditor as you agree.
Law firms
Issue fee invoices as PDF and keep client contacts in a CRM. How client data is handled under the PDPO remains your responsibility.
Company secretaries
Keep client contacts in a CRM and send your own SMS or e-mail reminders from 4notify. Annual returns, BR renewals and register updates are recorded and filed by you with the authorities.
IT & design agencies
Issue PDF invoices to local and overseas clients and keep client records in a CRM. Currency conversion follows your accountant’s method.
The 4b2b ecosystem
Why an ecosystem instead of separate apps
The 4b2b ecosystem is a group of business apps that share one account, one company record and one customer record. You switch on only the modules you need, and anything entered once shows up everywhere else — from invoicing through contracts to timesheets.
- One login for every module, with permissions set per role.
- Company and customer details are entered once, not six times.
- One subscription, with modules you turn on as you go.
- Local tax compliance included on every market we open.
Questions about the ecosystem
Short answers to what small companies ask most often before choosing. Each one has its own page, with worked examples and the mistakes to avoid.
What is the 4b2b ecosystem?
Invoicing, accounting, CRM, ERP, HR, projects, contracts and notifications under one account, with local compliance on each market.
How does an ecosystem cut software costs?
It removes parallel subscriptions and paid connectors: replacing six separate apps typically takes 40–60 % off the monthly bill.
What does Single Sign-On mean for a company?
One person signs in once and reaches every module; when they leave, access is revoked from a single place.
How is tax compliance handled across 70 countries?
Every market has its own e-invoicing format and channel, and the ecosystem applies them from the market you selected.
Partner programme — Hong Kong
Accountants, company secretaries and IT consultants earn a recurring commission for every active client they refer — not a one-off referral fee. The more modules a client uses, the higher the combined commission.
Accounting firms
20–30 %
Recurring commission on every client account you refer and retain.
Company secretaries
10–20 %
Earned on referrals arising from incorporation, Business Registration and annual return work.
IT partners
20–30 %
Tiered upward when you integrate several modules — invoicing, ERP, HR, notifications — for one client.
