The Most Common Errors Detected by ZUS and How an Accounting Office Supports Businesses During an Inspection

The most common errors detected by ZUS are usually not the result of bad faith on the employer’s side. More often, they stem from changing regulations, complex contribution rules and the lack of ongoing verification of payroll and HR documentation. Businesses employing workers and contractors under various forms of cooperation are particularly exposed to risk.

It is worth noting that the detailed course of a ZUS inspection and the scope of the institution’s powers are discussed in our article regarding ZUS inspections. In this article, we focus on what entrepreneurs care about most – the most common errors identified during inspections and how a professional accounting office helps minimise risk.

The Most Common Formal Errors Detected by ZUS

Late Registration for Social Insurance

One of the most common errors in ZUS settlements involves delays in registering employees or contractors for social insurance. Employers are required to register workers within a legally specified timeframe. In practice, delays are often caused by internal organisational changes, rushed hiring processes or an inefficient flow of documentation.

Such irregularities may result in document corrections, outstanding contribution payments and additional explanations during an inspection.

Errors in Contribution Calculations and Settlements

Understated Contribution Bases

One of the most serious inspection areas concerns errors in calculating social security contributions. ZUS carefully analyses situations in which the contribution base appears to be artificially lowered.

Common issues include:

• excluding parts of remuneration,
• incorrect classification of benefits,
• improper treatment of salary supplements,
• incomplete contribution settlements for employee benefits.

If ZUS determines that contributions were underpaid, the employer may be required to pay outstanding amounts together with statutory interest.

Incorrect Contribution Treatment of Salary Components

Another frequent issue concerns misinterpretation of which remuneration components are subject to social insurance contributions.

In practice, inspectors verify among others:

• bonuses,
• incentive payments,
• additional benefits,
• reimbursement equivalents,
• in-kind benefits.

These mistakes are particularly common in businesses without ongoing payroll support.

Errors in Benefits, RSA Reports and Insurance Breaks

ZUS carefully reviews documentation related to sickness, maternity and care benefits.

The most common ZUS-related mistakes include:

• incorrect reporting of insurance breaks,
• errors in RSA documents,
• incomplete benefit documentation,
• incorrectly calculated benefit bases,
• inconsistencies between payroll documentation and declarations submitted to ZUS.

These are among the areas where inspectors most frequently request additional explanations.

Civil Law Contracts Under ZUS Scrutiny

Contract for Specific Work vs Contract of Mandate

The topic of contract of mandate inspections by ZUS attracts significant attention from entrepreneurs for a reason. Civil law contracts are among the most frequently audited areas.

ZUS regularly examines whether a contract for specific work was used solely to avoid social insurance contributions. Inspectors primarily assess the actual nature of the work and expected outcomes.

If responsibilities are repetitive, ongoing or resemble service provision, there is a substantial risk that the contract may be challenged.

Contract of Mandate vs Employment Relationship

ZUS also verifies whether a contract of mandate actually contains features of an employment relationship.

Special attention is given to:

• employee subordination,
• fixed working hours,
• supervision of work,
• designated workplace,
• continuity of cooperation.

If the inspection determines that the relationship effectively resembled employment, the employer may be required to pay overdue social insurance contributions.

Sham Employment

ZUS carefully analyses situations involving sudden salary increases before benefit claims or employment initiated shortly before planned maternity or sickness benefits.

Inspectors examine whether:

• work was genuinely performed,
• the scope of duties was realistic,
• evidence of work performance exists,
• remuneration was proportionate.

How Does an Accounting Office Minimise the Risk of a ZUS Inspection?

Ongoing Document Verification

Professional payroll and HR support enables businesses to identify irregularities before an inspection occurs.

An accounting office continuously monitors:

• employee registrations and deregistrations,
• correctness of ZUS codes,
• consistency of HR documentation,
• completeness of declarations,
• timeliness of settlements.

This significantly reduces the risk of corrections and costly consequences.

Correct Calculation of Contributions

One of the most important support areas involves accurate contribution calculations. Specialists verify contribution bases, assess salary components and ensure documentation consistency.

This is particularly important for businesses employing individuals under multiple cooperation models.

Civil Contract Review

A professional accounting office helps evaluate whether a given cooperation model is safe from a ZUS perspective.

The review includes:

• scope of responsibilities,
• work performance structure,
• risk of contract reclassification,
• contribution obligations.

This allows entrepreneurs to avoid disputes and expensive corrections.

ZUS Inspection and the Role of an Accounting Office – What Does Real Support Look Like?

Preparing Documentation for Inspection

The phrase “ZUS inspection accounting office” is increasingly searched online for good reason. Entrepreneurs highly value professional support from the moment inspection notice is received.

An accounting office helps organise documentation, prepare declarations, contracts, payroll records and HR files.

Communication with ZUS Inspectors

Support from an accounting office during a ZUS inspection also includes communication with inspectors, providing explanations and responding to questions regarding settlements.

This means entrepreneurs are not left alone to deal with administrative complexities and can continue focusing on business operations.

Explanations and Objections to Inspection Reports

Following the inspection, ZUS prepares an inspection report. If the entrepreneur disagrees with the findings, formal objections may be submitted.

An accounting office provides support through:

• analysing inspection findings,
• collecting supporting documentation,
• preparing explanations,
• building factual arguments.

Support in Appeals Against ZUS Decisions

If ZUS issues an unfavourable decision, entrepreneurs have the right to appeal.

At this stage, accounting office support usually includes:

• documentation analysis,
• preparation of evidence,
• settlement summaries and calculations,
• cooperation with legal counsel.

Well-prepared documentation significantly improves the chances of a positive outcome.