Which KSeF software is best for a small business?

The best KSeF software for a small business supports its complete invoice process in the right plan. For straightforward invoicing, start with the Ministry of Finance's Taxpayer Application and invoicing plans. If you also need purchase invoices, a team or CRM, compare retrieval, permissions and limits.

Fakturownia and IFIRMA offer options for businesses working with their own accountant. wFirma requires an accounting module to retrieve purchases from KSeF. KSeFGPT is worth considering when invoicing sits alongside CRM, AI assistance or preparing your own sales data from PDFs.

This comparison covers five selected options and offers checked on September 18, 2026. The plan matters as much as the brand. A monthly figure may require annual payment, and OCR for supplier invoices may not process your own sales documents.

An owner issues an invoice, an employee checks purchases and the accountant needs a complete set of documents. Software that covers only the first stage can leave the rest in email and spreadsheets. A service business also needs customer agreements, sales stages and follow-up dates. KSeF is Poland's national e-invoicing system; this guide concerns businesses using it, including a Polish sole proprietorship, commonly called JDG. The plans and four example scenarios below help you select two options to evaluate against your actual needs.

This comparison is published by KSeFGPT, whose offer is also included.

Which software fits your business?

What does the right plan cost?

When should CRM and KSeF invoicing work together?

Four software selection scenarios

What should you check before buying?

How this comparison was prepared

Frequently asked questions

The KSeF 2.0 Taxpayer Application provides a free reference point. The Ministry of Finance confirms issuing and receiving invoices, corrections, XML/PDF downloads, official receipts (UPO) and permission management. For a straightforward process, first establish whether that covers your needs.

Fakturownia: consider Micro for very low sales volume, Start for one operational user and Standard for a team. One user with the system Accountant role is outside the user limit, including on Micro. The help centre describes purchase retrieval every 15 minutes and email or push notifications for the owner. Initial retrieval covers the current and previous month; older documents require a separate XML import.

IFIRMA: Faktura+ is an option for unlimited sales invoices, multiple users and sharing with an accountant. The cheapest plans exclude features such as recurring invoices and downloading a ZIP archive. If you need those functions, invoice volume alone does not decide the plan. Check purchase retrieval frequency for your selected offer.

wFirma: Fakturowanie i CRM covers sales and multiple users. Importing purchases from KSeF requires an accounting module. Księgowość offers manual retrieval or automatic overnight retrieval, together with purchase document processing through Magic Box. For a sole proprietor keeping their own books, this meets a broader need than issuing invoices alone.

KSeFGPT: combines invoicing with CRM, AI Chat and data imports. Check PDF, opportunity, task and organisation limits when choosing a plan. Accounting still requires an accountant or suitable accounting software.

Use the table to identify the required scope first. Then compare the price of the plan that actually includes it.

The amounts below are in Polish złoty (PLN), excluding VAT, based on offers compared on September 18, 2026. They cover the software and key purchase conditions. Bookkeeping services, extra integrations and every possible add-on are outside these headline prices.

Payment period: IFIRMA Faktura+ requires PLN 150 for a year. Fakturownia's website requires a minimum of 12 months for Start and 6 months for its other paid plans. Monthly purchases through its mobile app use a separate Apple/Google billing channel; check those prices separately.

Scope: wFirma Księgowość includes invoicing within PLN 60. Do not add another PLN 25 for Fakturowanie i CRM. Likewise, do not compare the sales-only price against another provider's plan covering both sales and purchase retrieval.

Add-ons: Fakturownia OCR counts pages, so a three-page invoice uses three scans. Its smallest extra package contains 250 pages for PLN 100 excluding VAT, valid for 90 days. Fakturownia's self-service accounting module is a separate add-on; hiring an accountant is another purchasing decision.

For a Polish sole proprietor keeping their own records, IFIRMA Księgowość internetowa is also relevant: PLN 54 excluding VAT with monthly payment, or PLN 49 per month when paid for six or twelve months. See the KSeF software cost comparison and the guide to subscriptions and perpetual licences for those separate decisions. In a service business, CRM can be another reason to consider a broader plan.

CRM helps when invoicing follows a longer customer relationship. A service business records agreements, follows an offer, schedules an action and then bills the sale. Keeping that information alongside invoices gives it a concrete reason to consider KSeFGPT, even without PDF imports.

Customer record: store company details, contact people and notes. Return to previous agreements when the conversation continues.

Opportunity and task: an opportunity records a sales stage; a task records a due date and responsible person. Linking a task to an opportunity is optional. Check whether that model fits the way you sell.

Invoice: starting an invoice from the customer record copies buyer details into the form. You still complete the number, dates, line items and payment details. Issuing it does not automatically attach it to an opportunity, complete a task or confirm payment. The guide to issuing an invoice from CRM shows the process.

Medium includes unlimited customer records and up to 10 opportunities and 10 tasks. Do not treat those limits as a monthly allowance that resets. Pro lists unlimited CRM. For team use, also confirm the organisation limit: Medium's description says a maximum of 2 and does not justify assuming it covers the owner plus two more people.

wFirma and IFIRMA also describe CRM. Check the same requirements with each provider: notes, contact people, opportunity stages, tasks and copying details to an invoice. A customer database alone does not establish that a product can replace your current CRM.

For preparing your own sales from files, KSeFGPT offers a PDF-to-draft processing queue. Review the result before a separate submission. Pro also includes spreadsheet imports of up to 300 invoices per month. Apply these capabilities to a specific scenario before choosing a subscription.

These examples are designed for your own evaluation. Their document counts are not legal thresholds, customer results or limits of the Ministry's tool. Each identifies a need and a condition that may change the decision.

A. Low sales volume: an owner and external accountant, with 3 sales invoices and 10 purchases per month, without OCR. Evaluate the Taxpayer Application, Fakturownia Micro and IFIRMA Darmowa Faktura. Ask what changes when you issue a fourth invoice: growth changes the conditions of the commercial free plans.

B. Purchase PDFs: an owner and accountant, 30 sales invoices and 80 purchases, including 10 PDFs outside KSeF, for example from foreign suppliers. Evaluate purchase processing in Fakturownia or wFirma Księgowość and the accountant's required export. A supplier's PDF must not become your own sales invoice. A sales-draft queue does not automatically replace purchase OCR.

C. Your own sales PDFs: an owner, employee and accountant, 100 sales invoices and 200 purchases monthly. Data from 40 of your own sales PDFs must be prepared before their first submission to KSeF. KSeFGPT Pro's stated PDF limit covers that volume; Medium allows 20. Confirm authority to issue the documents, that they have not already been accepted in KSeF, and access for all three people. Another tool's purchase OCR does not establish support for this sales import.

D. A service business using CRM: an owner issues 20 invoices monthly and needs agreements, sales stages and next actions in one place. In KSeFGPT, they can add a note, create an opportunity, add a task and start an invoice from the customer record after a real sale. Invoice volume does not determine opportunity volume. Check whether Medium's 10 opportunities and 10 tasks suffice or whether you need Pro or another CRM configuration.

Choose the closest scenario, replace its volumes with your own and evaluate two options against the same tasks.

Start with two products that meet your chosen scenario. Record the intended plan, payment period and add-ons for each. This keeps a broad trial from hiding the limits of the plan you will actually buy.

Documents: prepare a standard invoice draft and a correction, locate a purchase, and inspect XML/PDF files, processing results and UPO using available documents. Send fictional invoices only in an appropriate test or demo environment. In production, keep the evaluation to drafts and genuine authorised operations.

Collaboration: check a separate accountant or employee account, document visibility and the agreed export. For example, Fakturownia's ERP Optima export is a file exchange requiring configuration; it does not establish continuous synchronisation with every accounting practice.

CRM and files: complete your scenario, correct extracted values and record which data must be moved manually. Also assess support. Fakturownia lists phone and email, IFIRMA its customer support team, and wFirma technical support plus optional assistance. Scope depends on the offer.

Fakturownia and wFirma offer 30-day trials, IFIRMA describes 30 days for self-service accounting, and KSeFGPT offers 7 days of PRO. Explore KSeFGPT invoicing and current prices and limits, then decide using the tasks you completed.

The author, Rafał Zeidler, is involved in developing KSeFGPT. This article is published by the provider of a product included in the comparison. The selection covers five options for different small-business processes.

The comparison concerns declared features and conditions of specific plans, using Ministry of Finance materials, price lists and provider documentation checked on September 18, 2026. The KSeFGPT process references published tutorials. Scenarios and evaluation tasks are editorial examples for readers to apply themselves.

We do not award speed, usability or OCR accuracy scores without comparable results. Your business requirements should determine the choice. Staying with a current product that already meets them can also be the right decision.

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