A small online store owner hears about KSeF in the news and wonders whether they now need to process every receipt for a regular customer through the state system. Does this mean new obligations for sales to private individuals? We answer step by step, based on official sources.
On this page you'll learn exactly what changes for B2C sales, what the deadlines are, and what you can do right now — without ready-made sales solutions, only based on regulations. If you're looking for the broader picture on KSeF and invoicing automation, see the separate article on invoicing automation and KSeF — it covers what a system must be able to do, while here we focus only on consumer sales.
Is selling to consumers mandatory in KSeF?
Let's start with the most important piece of information, as it clears up the most doubts:
Issuing B2C invoices (for private individuals — consumers) in KSeF is voluntary — both before February 1, 2026 and after that date. The Ministry of Finance confirms this directly on the KSeF portal: consumers and individuals are not obligated to issue e-invoices in the KSeF system.
This is a key distinction: the KSeF obligation applies primarily to B2B transactions, i.e., between businesses. If your company sells mainly to private individuals, you don't need to go through KSeF for that part of sales.
Source: Ministry of Finance, KSeF portal — Consumers and individuals.
What does this mean in practice?
If you run a small online store and most of your customers are private individuals not running a business, you can safely continue the current way of issuing sales documents. You don't need to:
- register in KSeF solely for consumer sales,
- generate structured e-invoices for every receipt,
- submit documents to the KSeF system for every transaction with a private individual.
KSeF mandatory implementation deadlines — who does it affect?
The obligation to issue invoices in KSeF comes in two stages, but it applies only to B2B transactions, i.e., between businesses:
From February 1, 2026 — for taxpayers whose sales value (including VAT) exceeded 200 million PLN in 2024. These are large companies that must now prepare for the full transition to e-invoicing.
From April 1, 2026 — for other taxpayers, unless the value of sales documented by monthly invoices does not exceed 10,000 PLN gross. In this case, small companies have an additional exemption until the end of 2026.
Where these amounts come from: the 200 million PLN limit applies to the company's total turnover in 2024. The 10,000 PLN monthly limit applies to sales documented by invoices — not total sales, only the part for which invoices are issued at all.
Source: Ministry of Finance, KSeF portal — Scope of mandatory KSeF.
Why doesn't this apply to consumer sales?
The regulations clearly distinguish between two transaction types:
- B2B (business-to-business) — between two entrepreneurs, both conducting business and having a NIP (tax ID),
- B2C (business-to-consumer) — between an entrepreneur and a private individual not running a business (consumer).
Mandatory KSeF applies only to B2B transactions. Sales to consumers, even after February 1 and April 1, 2026, remain outside the mandatory e-invoicing system. You can issue traditional receipts, simplified invoices, or voluntarily use KSeF — the choice is yours.
Receipts with NIP up to 450 PLN — what can you still use?
Until December 31, 2026, it is possible to issue invoices using cash registers, including receipts with buyer's NIP up to 450 PLN (or 100 euros), which are recognized as simplified invoices. This solution continues to work and doesn't require transitioning to KSeF.
How does it work in practice?
A receipt with NIP issued for an amount up to 450 PLN gross is treated as a simplified invoice. The customer — a private individual running a business — can provide their NIP on the receipt, and you as the seller have the basis for VAT deduction. This mechanism works independently of KSeF and will be available until the end of 2026.
This is important for many small online stores: some customers are individuals running businesses (freelancers, small service providers) who buy for their company. They can provide a NIP on the receipt and receive a simplified document — without needing to generate a full invoice in the KSeF system.
What doesn't go to KSeF at all?
The Ministry of Finance has also defined documents that are never submitted to KSeF, regardless of company size:
- proforma invoices,
- internal invoices,
- internal documents,
- credit and debit notes,
- corrective notes — these were repealed as of February 1, 2026.
If you issue these types of documents in your store, you don't need to submit them to KSeF at all.
Cash register exemption — does your store even need one?
It's worth remembering one more thing: a small online store selling mainly to consumers may not need a cash register at all. There is a subjective exemption from the cash register requirement.
The exemption applies to taxpayers whose sales to private individuals not running a business or flat-rate farmers did not exceed 20,000 PLN in the previous tax year. The limit is calculated proportionally to the time of conducting business in a given year.
Source: biznes.gov.pl — Exemption from the cash register obligation.
What does this mean for a new store?
If you're just starting online sales and your customers are mainly consumers, you may not need a cash register at all — provided you don't exceed the 20,000 PLN annual turnover threshold from private individuals. In this situation, you issue ordinary receipts or sales documents without fiscalization, and the KSeF obligation doesn't apply to you in the B2C part anyway.
The exemption ceases to be valid after two months following the month in which the 20,000 PLN limit was exceeded. Then you must start recording sales using a cash register.
E-invoice — what is it and do you have to use it?
An e-invoice is an XML file containing a KSeF number issued by the system. It is archived in KSeF for 10 years and available to the recipient with a NIP in the system.
For a pure B2C store (selling only to consumers), the e-invoice remains an option, not an obligation. You can decide to voluntarily issue e-invoices, but regulations don't force you to.
When can an e-invoice be useful despite consumer sales?
There are situations where voluntary transition to e-invoices in B2C makes sense:
- Some of your customers are small businesses — even if most sales are consumers, you may have regular customers running businesses (e.g., small companies, sole proprietorships). For them, an e-invoice in KSeF is convenient because it goes directly to their accounting system.
- Process automation — if you plan to implement an invoicing automation system anyway, KSeF support can be part of it.
- For archival order — 10-year archiving in the state system may be more convenient than your own solutions.
The decision depends on your customer structure and willingness to invest in a system.
What actually changes for your store right now?
For most small online stores selling to consumers nothing changes in terms of documenting sales:
- You can still issue receipts from a cash register,
- Receipts with NIP up to 450 PLN still work as simplified invoices,
- You don't need to register in KSeF solely for B2C sales,
- You can voluntarily join KSeF, but you don't have to.
The only change that may affect you is the need to prepare for B2B transaction handling — if some of your customers are entrepreneurs (companies with NIP) and your turnover exceeds the mandatory KSeF thresholds. Then part of your sales (that made to other businesses) will need to be documented with e-invoices in the KSeF system.
Do it yourself: check your customer structure
Before making any decisions about KSeF, analyze your customer base. This will help you estimate what portion of sales is actually B2C and what are B2B transactions.
How to do it in three steps:
- Get data from the last quarter — extract a list of all orders from the last three months.
- Identify customers with NIP — check how many customers provided a NIP when purchasing. These are your B2B customers.
- Calculate the proportion — divide the number of customers with NIP by the total number of customers. Example with illustrative numbers — substitute your own: if 7 out of 100 customers gave a NIP, the B2B share is 7/100 × 100 = 7%. If your result is low, you probably don't need mandatory KSeF in the near future.
This simple analysis will help you make an informed decision: whether you need to worry about KSeF at all in the near term, or whether your sales are typically consumer-based. The order list with NIP is easier to review once the data is already organized — see reporting automation for how to set up numbers worth actually looking at. If you're only starting to organize processes in your store, also read where to start automation in a small business — customer structure is one of the thresholds worth starting from.
How it looks with a system: automation for your peace of mind
If you run an online store and want to organize sales documentation matters, an automation system can help with daily work — regardless of whether you use KSeF voluntarily or not.
Scenario with a system:
Customer order → system recognizes customer type (individual or company with NIP) → automatically generates appropriate document (receipt or invoice) → archives it for the required period.
For pure B2C: system issues receipts or simplified invoices, archives according to regulations, and doesn't require KSeF integration.
For mixed structure (B2C + B2B): the system can handle both document types — traditional for consumers, e-invoices in KSeF for businesses — depending on what's required. Business customers and their documents can be kept in CRM and automations, which hold data and contact history in one place instead of scattering them across spreadsheets.
The Online Stores service gives you a catalog, payments and delivery ready for launch, with returns and inventory handled in line with the law. The Integrations service connects the store with the cash register, CRM and spreadsheet in one data flow, with error handling and logs. For a rough cost of such an implementation, see how much does process automation cost in a company.
See how it works: go to Online Stores or ask about Integrations if you need to connect with an accounting or fiscal system.
When is it worth consulting a tax advisor?
Every company has a different revenue and customer structure. If you have doubts about your specific store situation — especially when:
- Some of your customers are companies, and turnover is approaching the thresholds of 200 million PLN or 10,000 PLN monthly,
- You run mixed sales (B2C + B2B) and don't know how to document individual transactions,
- Your company is only growing and you want to plan invoicing infrastructure in advance,
— it's worth asking a tax advisor for interpretation of regulations for your specific case. A tax advisor will help assess whether and when the KSeF obligation will apply to your company.
Frequently asked questions
Do I have to issue invoices in KSeF for all customers from February 1, 2026?
No. Mandatory KSeF applies only to B2B transactions — between entrepreneurs. Sales to consumers (private individuals not running a business) remain voluntary. You can still use cash registers and traditional receipts.
Does a small online store need a cash register?
Not necessarily. If sales to private individuals did not exceed 20,000 PLN in the previous year, you can use the subjective exemption from the cash register. In this case, you issue ordinary sales documents without fiscalization.
Do receipts with NIP up to 450 PLN still work?
Yes. Until December 31, 2026, receipts with buyer's NIP up to 450 PLN (or 100 euros) are treated as simplified invoices and don't require submission to KSeF. This solution works regardless of company size.
What happens if my turnover exceeds 200 million PLN in 2024?
Then you issue e-invoices for B2B transactions in KSeF from April 1, 2026 (from February 1 if your 2024 sales exceeded PLN 200 million), unless sales documented by invoices stay at or below PLN 10,000 gross a month — in that case the exemption runs until the end of 2026. Sales to consumers can still be documented outside the KSeF system, but transactions with businesses must be made as e-invoices.
Do I have to send proforma invoices and corrective notes to KSeF?
No. The Ministry of Finance clearly states that proforma invoices, internal invoices, internal documents, credit and debit notes are not submitted to KSeF. Additionally, corrective notes were repealed as of February 1, 2026.
Is it worth voluntarily switching to KSeF for B2C sales?
Voluntary transition to KSeF makes sense if some of your customers are small businesses that can use e-invoice in their accounting system, or if you plan invoicing automation and want 10-year archiving in the state system. For a typical purely B2C store, it's not necessary.