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Education
How do Polish grade averages and admission points work?
Learn when to use an ordinary or weighted grade average and how Polish exam, school and university admission points differ.
4 August 2026
Guides
Featured guide
How can Polish VAT, salary and interest calculators be used safely?
Finance and taxReviewed: 30 September 2026
Guides
All guides
Practical explanations of Polish formulas, rules and everyday calculations.
8h
Employment
How should Polish working-time, leave and pay results be read?
Understand the difference between Polish working time, seniority, leave, compensation, overtime and notice periods.
30 September 2026
PLN
Finance and tax
How can Polish VAT, salary and interest calculators be used safely?
Learn how to prepare rates for Polish VAT, gross-to-net salary, interest and mortgage-overpayment calculators.
30 September 2026
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Business and leasing
How should Polish B2B and leasing scenarios be compared?
Learn how to prepare transparent assumptions for simplified Polish B2B cash flow and model leasing payments and cost.
22 September 2026
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Savings and investing
Deposits, bonds, savings and ROI — what should be compared?
Understand simple interest, compounding, regular contributions and the limitations of a simple return-on-investment ratio.
22 September 2026
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Health and fitness
Pace, sleep, BMR, TDEE and calories — how should estimates be read?
Learn what pace and sleep tools measure and how indicative BMR, TDEE and an entered-intake comparison differ.
22 September 2026
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Pregnancy and family
Pregnancy age, due date and cycle — what do the dates mean?
Understand gestational age, conception date, estimated due date and the limits of a calendar-based fertile window.
22 September 2026
24h
Time and date
Date differences, hours and age — how can off-by-one errors be avoided?
Learn whether a date result includes the starting day, how to calculate across midnight and how complete calendar age works.
23 September 2026
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Mathematics
Percentage of a number, ratio and percentage change — how do they differ?
Understand three common percentage operations, the correct denominator for change and cases where a result is undefined.
23 September 2026
km
Automotive
Fuel consumption, journey cost and tire size — how are they calculated?
Learn how to calculate l/100 km and journey fuel cost and interpret tire-diameter geometry and speedometer differences.
23 September 2026
ID
Polish documents and numbers
Polish tax microaccount — how can the number be checked safely?
Learn how to select a PESEL or NIP, recognise tax-microaccount structure and officially confirm the result before paying.
30 September 2026
Aa
Text and fonts
Decorative Unicode and Polish characters — how does it work?
Learn why decorative Unicode letters are not a font, how Polish marks are preserved and where rendering or accessibility can fail.
23 September 2026
8h
Employment
How to calculate Polish employer sick pay in 2026
Prepare the Polish employer sick-pay basis, check the 33 or 14-day limit and follow a gross-payment example. Practical guide and calculator for 2026.
30 September 2026
8h
Employment
Polish sickness allowance in 2026: amount and benefit period
Learn which days to enter, how to prepare the Polish sickness-allowance basis and how the 182 or 270-day limit affects a gross estimate in 2026.
30 September 2026
8h
Employment
Polish domestic business travel 2026: meals, allowances and advances
Check Poland’s 8 and 12-hour thresholds, PLN 45 daily allowance, meal deductions and hotel costs. Worked domestic travel settlement with an advance.
30 September 2026
8h
Employment
Polish foreign business travel 2026: allowances, currency and hotels
Choose the destination and currency, measure the foreign travel leg and deduct meals. Germany example, hotel limits and advance settlement under Polish rules.
30 September 2026
8h
Employment
Polish umowa-zlecenie in 2026: how to calculate net pay
Calculate Polish mandate-contract net pay: ZUS, PIT-2, student status, youth relief and payer cost. Follow a PLN 5,000 gross example for 2026.
30 September 2026
8h
Employment
Polish umowa o dzieło in 2026: net pay and 20% or 50% costs
Calculate Polish umowa o dzieło net pay. See 20% and qualifying 50% cost examples, the copyright cap, PIT-2 and the separate small-contract mode.
30 September 2026
PLN
Finance and tax
How to calculate mortgage repayments and a purchase budget in Poland
Prepare the mortgage amount, down payment and interest rate. Compare equal and decreasing payments, fees and LTV without treating the model as a bank offer.
30 September 2026
PLN
Finance and tax
How to calculate cash-loan payments and costs in Poland
Calculate loan payments and compare cash-paid versus financed fees. Follow equal and decreasing repayment examples and distinguish nominal interest from APR/RRSO.
30 September 2026
PLN
Finance and tax
Polish net-to-gross salary in 2026: finding gross pay
Convert Polish employment net pay to gross for 2026. Check PIT-2, costs, ZUS limits and PPK, with a PLN 3,738.19 net example explaining payroll rounding.
30 September 2026
PLN
Finance and tax
Polish annual PIT for 2026: tax bands, advances and refunds
Estimate individual Polish tax-scale PIT for 2026. Separate income, social deductions and advances; follow refund and amount-due examples and check exclusions.
30 September 2026
PLN
Finance and tax
How to calculate a Polish pension from ZUS balances
Understand the Polish pension model: indexed contributions, initial capital, eligible subaccount and GUS divisor. See an example and why this is not a forecast.
30 September 2026
PLN
Finance and tax
Borrowing capacity and your budget: calculating a scenario
Estimate financing from your household budget, debts and chosen rate buffer. Follow a worked example and understand why the result is not bank approval.
30 September 2026
ID
Polish documents and numbers
How to check a Polish NIP and read the validation result
Check Polish NIP format and checksum step by step. Follow an example, diagnose common errors and distinguish technical validation from VAT-status checks.
1 October 2026
ID
Polish documents and numbers
How to check a Polish PESEL, encoded date and checksum
Understand Polish PESEL date, century and checksum checks. Follow a leap-day example, recognise common failures and learn the local validator’s limits.
1 October 2026
ID
Polish documents and numbers
How to generate test NIP values for form validation
Prepare test NIP values without customer data. Learn environment isolation, passing and failing checksum modes, and the limits of batches of 1–20 values.
1 October 2026
ID
Polish documents and numbers
How to generate test PESEL values without real people’s data
Generate test PESEL values with a synthetic date and sex marker. Check checksum modes, leading zeros, copy output and isolation from production.
1 October 2026
Content review: 4 August 2026