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Finumero · financial decision tools

Make a better financial decision.

Calculators, comparisons and step-by-step paths — real numbers instead of marketing. Start from the question on your mind.

Most used:

SalaryCreditworthinessLoan instalmentB2B invoice
Decision paths

Not one calculator. The whole process.

Big decisions are made of small steps. Walk them in the right order.

Sections

Five areas, one standard of honesty

We break every category down to real costs and present it objectively. Choose what interests you.

Tool

Not sure where to start? Answer 5 questions

The finder matches an account to how you really use business banking.

How we read offers

We look at total cost, not the marketing slogan

“From PLN 0” can cost the most — on transfers, a conditional card, the spread or the APR. So we break every offer into real components and label advertising material.

Calculators

Work out the real cost of a business

Salary calculator

Gross to net — employment, mandate and task contracts. With PPK and youth relief.

Employment vs B2B

Compare take-home, ZUS and benefits. Find the break-even rate.

ZUS calculator

How much ZUS you'll pay as a sole trader: start relief, preferential and full ZUS.

Income-tax calculator

Tax scale, flat or lump-sum (all rates) — how much income tax you'll pay.

B2B invoice — take-home

What's really left from an invoice after ZUS and tax.

Loan instalment calculator

Equal and decreasing instalments, total cost and APR.

Creditworthiness calculator

How much you can borrow — the bank's method (DStI, KNF buffer). A real range.

Overpayment & early repayment

Shorten the term or cut the instalment — plus the fee refund you're owed (Lexitor).

Down payment calculator

Full cash to buy: down payment, PCC, notary. And how many months to save it.

Car leasing tax costs

CO₂-based limit, proportion, 50/100% VAT, 75% running costs — what you actually deduct.

Account for foreigners

Find your account in 4 questions — who opens without PESEL.

How to register a business

6 startup decisions + CEIDG checklist. An assistant that remembers your progress.

Leasing vs loan

A company car after the tax shield — with the new 2026 limits (100/150/225k).

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