polish-salary-calc 0.1.1

Polish salary calculator

Polish Salary Calculator

A precise and configurable salary calculator for the Polish tax and social contribution system. The library supports multiple contract types, including Employment, Mandate, Work Contract, and Self-Employment, with full control over contribution rates, cost deductions, and tax configuration.

This library is intended for:

• HR systems
• Payroll automation tools
• Business and accounting applications
• Financial simulations and benchmarking

All monetary calculations use Decimal for accuracy.

Features

• Employment Contract (Umowa o pracę)
• Mandate Contract (Umowa zlecenie)
• Work Contract (Umowa o dzieło)
• Self-Employment (B2B) including lump-sum, linear tax, and more
• Yearly salary summary and month-by-month adjustment
• Contract-to-contract cost comparison
• Export to Excel, CSV, JSON, and Pandas DataFrame
• Builder-based configuration interface

Installation

pip install polish-salary-calc

Basic Example

from decimal import Decimal
from polish_salary_calc.rates.rates import Rates
from polish_salary_calc.contracts.employment_contract import EmploymentContract
from polish_salary_calc.contract_settings.employment_contract_settings import EmploymentContractSettings
from polish_salary_calc.contracts.base_contract import SalaryType

rates = Rates()

settings = (
    EmploymentContractSettings().builder()
    .is_increased_costs(True)
    .build()
)

contract = EmploymentContract(rates, settings)
contract.calculate(Decimal("7000"), SalaryType.GROSS)

print(contract)

Year Summary Example

from polish_salary_calc.summary.contract_summary import YearContractSummary
year_summary = YearContractSummary(rates, settings, Decimal("8000"), SalaryType.NET)
year_summary.calculate()
print(year_summary)

Export

contract.to_excel("contract.xlsx")
year_summary.to_json("summary.json")

Python Version Requirement

Python 3.9+

License

MIT