Accounting firm vs online accounting – which to choose

“Accounting firm or online accounting?” is a question that most new entrepreneurs ask themselves in 2026. The market offers many solutions: from simple invoice generators to advanced AI platforms. In the background are traditional accounting firms with a human accountant.

This article compares the two models pragmatically – on costs, scope of liability and typical pitfalls. Our perspective is from the other side of the counter: we have run an accounting firm since 2006, and over the years we have seen what works and what ends in trouble during a tax office (US) inspection.

Model 1: online accounting – who it is for

Online accounting is a web application (SaaS) with an interface for keeping the ledger, issuing invoices and filing returns yourself.

Strengths

• Low price – PLN 20–150 a month depending on the plan
• Available 24/7 – your data is always at hand in the browser
• Automation – import from online banking, automatic reading of invoices from scans (OCR), downloading invoices from KSeF (the national e-invoicing system)
• Visualisation – dashboards with reports and indicators
• Basic help – FAQ, chat with a consultant, a knowledge base

Weaknesses

• No professional liability – an error in your own use of the program is your risk
• No individual analysis – you will not get a discussion of IP Box, the Estonian CIT or a strategy for the coming years
• It requires knowledge – you must understand what you are doing: registered lump-sum tax vs the progressive tax scale, costs vs revenue, 0% VAT vs exempt (ZW)
• No contact with an accountant – an AI chat or a general consultant instead of a person who knows your company

Who it suits best

1. A sole trader (JDG) with a simple profile – a freelancer, a consultant, an online shop with a small turnover
2. Taxation on the tax scale or the registered lump-sum tax – the simplest forms
3. No employees, or 1–2 people on a contract of mandate (umowa zlecenia)
4. No VAT, or VAT only on simple domestic transactions
5. An owner who has the time and the wish to deal with the formalities alone

Model 2: an accounting firm – who it is for

An accounting firm is a service company in which your documents are handled by an accountant. You pay a monthly fee in exchange for full accounting, tax and often HR and payroll service. Check whether the firm has the mandatory professional indemnity insurance and who keeps the books there. No state licence or certificate is required today to keep the books.

Strengths

• Professional liability – the accountant’s professional indemnity insurance (compulsory insurance)
• An individual accountant – who knows your company, the conditions of your industry and your history
• Proactive pointing out of reliefs and risks – within the scope of the books being kept (tax advice and tax opinions going beyond day-to-day settlements are provided by tax advisers, in line with the Tax Advisory Act)
• Support in dealings with the authorities – inspections by the tax office and ZUS (Polish social insurance), preparing applications, JPK (Standard Audit File) files, KSeF (representation in proceedings – within the scope allowed by the Tax Advisory Act)
• Full bookkeeping – limited companies, joint-stock companies, accounting books
• HR and payroll – contracts, payroll lists, ZUS, PIT-11

Weaknesses

• A higher price – PLN 200–2,500 a month
• Dependence on the firm’s schedule – you deliver documents by set deadlines
• Varying quality of service – depending on the firm

Who it suits best

1. A sole trader with a high turnover or a complex profile (many suppliers and customers, VAT, exports/imports)
2. Limited companies, joint-stock companies, limited partnerships – where full bookkeeping is compulsory
3. With employees – HR and payroll require expertise
4. Using reliefs (R&D, IP Box, Estonian CIT)
5. The owner wants to focus on the business – not on paperwork

A cost comparison – concrete figures

| Company profile | Online accounting | Accounting firm | |---------------|---------------------|---------------------| | Sole trader on the tax scale, no VAT, up to 20 invoices a month | PLN 20–40 | PLN 150–250 | | Sole trader with VAT, 50 invoices a month | PLN 40–80 | PLN 250–400 | | Sole trader with 2 employees | PLN 80–150 | PLN 400–700 | | Limited company, small | PLN 150–300 | PLN 600–1,200 | | Limited company, 10 employees | Impractical | PLN 1,500–3,000 |

Liability for errors

The key difference between the models is who bears the consequences of a mistake.

With online accounting

You do. An online program is a tool, not an accounting service. If you forget to charge VAT, classify a cost wrongly or fail to report split payment (MPP), that is your responsibility. The platform provider is responsible only for the operation of the software.

With an accounting firm

You and the firm together – but the firm has mandatory professional indemnity insurance (Article 76h of the Accounting Act). If the accountant makes a mistake, the policy covers the loss within the scope of, and up to the sum stated in, its terms. The minimum sum insured is the equivalent of EUR 10,000 per event (§ 4(1) of the Regulation of the Minister of Finance of 6 November 2014, Journal of Laws 2014, item 1616). Unpaid tax is not a loss, and penalties and fines are personal and, as a rule, cannot be insured.

Formally it is you, as the taxpayer, who answers to the tax office – and any claims against the firm depend on the contract, the Civil Code and the terms of the policy.

What about KSeF 2.0

From 1 February 2026, KSeF has applied to the largest taxpayers (sales in 2024 above PLN 200 million), and from 1 April 2026 to all the others, including those exempt from VAT. Until 31 December 2026, the smallest taxpayers, whose sales documented by invoices do not exceed PLN 10,000 gross a month, may still issue invoices outside KSeF (Article 145m of the VAT Act). Both options cope with this:

• Online programs – integrated with KSeF, with automatic downloading/issuing
• Accounting firms – use their own system with KSeF integration, or access to your online program

The difference: with a firm, KSeF permissions are granted to an entity (the firm, by its NIP tax identification number), with the possibility of passing them on to the firm’s employees; with an online program, you manage them yourself.

The most common mistakes of online accounting clients

From our practice, these are the most common problems of clients who moved from online accounting to a firm after running into trouble:

1. Inconsistencies in JPK – wrong VAT rates, missing GTU markings (goods and services group codes), mistakes in MPP
2. Costs not booked – unsystematic collection of documents, invoices lost in email
3. Mistakes in ZUS – outdated rates, health contribution calculated wrongly
4. No documentation for reliefs – the client knows they use IP Box but does not keep the records
5. Late returns – the client forgot, the system did not remind them

Some problems lead to financial penalties from the tax office, others to the loss of the right to reliefs.

When to change model

Signs that it is time to move from online accounting to a firm:

1. Income exceeds PLN 500,000 a year – complexity grows and reliefs become worthwhile
2. The first employee – HR and payroll are a separate field
3. VAT registration – JPK_V7 reporting with the full GTU structure
4. A company instead of a sole trader business – full bookkeeping is compulsory
5. Planning reliefs (R&D, IP Box, Estonian CIT)
6. A specific industry – international e-commerce, construction (MPP, reverse charge), services for foreign customers
7. The first problems with the tax office – an inspection or a summons

Summary

Both options have their place. Online accounting is for a simple, small business with an owner who likes to deal with the formalities. An accounting firm is for growing companies, limited companies, VAT-registered profiles and those that use reliefs.

Our recommendation is simple: start with online accounting if your sole trader business is small and simple. Move to an accounting firm when one of the signs above appears. Many firms offer flexible models – full service or just taking over the returns, an audit once a quarter, advice on demand. See our services and book a 30-minute conversation with no obligation. You will find a full checklist of business costs in What to put in your sole trader costs.

Sources: biznes.gov.pl, the Accounting Act (Article 76h – the accountant’s professional indemnity insurance), the Regulation of the Minister of Finance of 6 November 2014 (Journal of Laws 2014, item 1616), market data for 2026.