Gross to net — how to calculate salary

Calculating gross‑to‑net is not difficult, but the result depends on several factors that can significantly change the outcome. Below is a practical step‑by‑step overview.

See also: When net pay changes and Minimum wage take‑home. Quick calculation: net salary calculator.

Gross vs net — the basics

• Gross is the contractual amount before deductions.
• Net is what you receive “in hand” after contributions and tax.

The difference comes mainly from employee ZUS contributions, health contribution and PIT advance.

Step‑by‑step: net pay under employment contract

1. Employee ZUS contributions — calculated from gross.
2. Health base — gross minus social contributions.
3. PIT advance — based on taxable base with KUP and reliefs.
4. Net — gross minus ZUS contributions, health contribution and PIT advance.

The fastest way: net salary calculator.

What most affects the result

Key factors:

• costs of earning (KUP) — reduce PIT base,
• reliefs and declarations (e.g., PIT‑2, youth relief),
• contract type (employment, mandate, contract for work),
• additional deductions (e.g., PPK, enforcement).

If you want to see how it changes, check: When net pay changes.

Gross‑to‑net under other contracts

Note: the net salary calculator is for employment contracts. For other contracts use the dedicated calculators below.

With a mandate or contract for work, net pay can differ for the same gross depending on contribution obligations.

• Mandate: net depends on insurance titles.
• Contract for work: usually fewer deductions, but different tax rules.

Quick comparison: mandate calculator and contract‑for‑work calculator.

Common mistakes

• comparing gross to net without contributions,
• ignoring the contract type,
• skipping KUP and reliefs,
• expecting net to grow proportionally with gross.

Short example (no numbers)

You receive a gross raise. Net increases, but not linearly — contributions and PIT advance grow as well. If you cross a tax threshold, part of the raise is absorbed.

Quick gross‑to‑net checklist

• identify contract type,
• check contribution obligations,
• include KUP and reliefs,
• use the calculator,
• compare with your payslip.

Related topics

• Minimum wage take‑home — how much is net
• Employee cost vs salary — key differences

Legal sources

• PIT act
• Social insurance system act
• ZUS — information for employees