KPiR – the Tax Book of Revenue and Expenses
The Tax Book of Revenue and Expenses (KPiR) is a form of record-keeping intended for entrepreneurs taxed under the tax scale (12%/32%) or the flat-rate (liniowy) tax (19%). Unlike the lump-sum tax, it takes deductible costs into account – so you can legally lower your tax base. TAX NINJA keeps your KPiR for you – we watch over every entry, deadline and return.
Our process
We collect documents
Invoices, receipts, bank statements — all online.
We record them
We enter the documents into the KPiR and settle VAT.
We report
We inform you about the tax due and file the returns.
You can change your form of taxation up to the 20th day of the month following the month in which you earned your first revenue in the tax year. Don't miss the deadline – get in touch with us well in advance.
Who keeps a KPiR?
The KPiR is used by:
- Sole proprietorships (JDG) on the tax scale or the flat-rate (liniowy) tax
- Partners in civil-law and general partnerships (individuals)
- Entrepreneurs for whom costs are a significant part of the business
What does keeping a KPiR with TAX NINJA cover?
- Ongoing recording of revenue and expenses
- Fixed-asset register and depreciation schedule
- Calculating monthly or quarterly income-tax advances
- VAT settlements – JPK_V7 returns
- Annual PIT-36 or PIT-36L return
- ZUS settlements and the health-insurance contribution
- Liaison with the US (tax office) and ZUS on the client's behalf
- KSeF integration and e-invoice handling
Flat-rate (liniowy) tax or the tax scale? We'll help you choose.
Choosing a form of taxation is one of the most important decisions when starting a business or changing it. TAX NINJA offers a free analysis before you sign the agreement – we'll check which form is more advantageous for your situation.
The benefits of a KPiR with TAX NINJA
- Fully remote service – you send documents via the app or by e-mail
- Proactive reminders about tax and ZUS deadlines
- Cost optimisation – we make sure you don't overpay your taxes
- Access to your accounting data 24/7
- Professional liability (OC) insurance of the accounting firm
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