Office and accounting tools
in one place
Pull e-invoices from KSeF, make quick and convenient payments, check tax rates and compare taxation options, and much more.
Find out for free how you can streamline your current or future business.
How will you use R4 Biuro?
Choose your path — we’ll tailor the tools and the initial setup of the app. You can always change this later in settings.
I’m a private individual
Calculators, NBP exchange rates and tools for personal finances — no business required.
- NBP rates & FX differences
- Interest & payroll calculators
- Contract & tax-form comparison
I’m thinking of starting up
See where to begin: tax forms, costs and simulations — before you register a business.
- Compare taxation forms
- Salary & contribution calculator
- Step-by-step start plan
I’m an entrepreneur
or I represent a company / accounting office
Full onboarding: KSeF, e-invoices, finances and multi-client management. A wizard sets the app up with you.
- KSeF Explorer & e-invoices
- Finances & cash-flow
- Multiple orgs & clients
Everything an accounting office needs
KSeF Explorer
Pull and browse invoices from the National e-Invoice System. Token + certificate auth (.p12 / .pfx / PEM).
NBP exchange rates
Current and historical NBP mid-market rates. Converter using the day-before-transaction rate.
FX differences
Compute exchange-rate differences between invoice date and payment date. PDF export.
Tax interest
Tax interest calculator using the current statutory rate (currently 10.50%).
Taxation forms
Compare progressive, flat-rate and lump-sum taxation — an interactive calculator for sole proprietors.
Payroll calculator
Gross/net payroll figures including ZUS contributions, income tax and tax-deductible expenses.
Multi-organisation account
Manage multiple companies from one account. Roles: Org Admin, Approver, Member.
Import costs
Import settlement covering customs duty, transport, handling fees and the NBP rate.
Ideas board
Submit and vote on new features. Your vote shapes the product roadmap.