Sole proprietorship: choosing a tax form and staying compliant

A sole proprietorship looks simple until the day you have to choose a form of taxation. That is when it turns out the decision is made once a year and its consequences show up in every transfer to the tax office and to the social insurance institution.

Three forms, three different ways of counting

There are three options: the progressive tax scale, flat-rate income tax and the lump sum on recorded revenue. The old tax card is being phased out and applies only to people who have used it continuously since before it closed to newcomers.

• The tax scale — tax on income, two brackets and a tax-free amount, with the option of joint filing with a spouse and family reliefs.
• Flat-rate tax — a single rate on income regardless of its size, but without the tax-free amount and without most family preferences.
• The lump sum — tax calculated on revenue with no deduction of costs; the rate depends on the type of activity and may differ between two services provided by the same person.

The rule of thumb is simple: the higher your real costs, the worse the lump sum looks. A developer working from a laptop has costs close to zero, so the lump sum usually wins. A renovation company buying materials and fuel counts costs in tens of thousands of zloty a year and, under the lump sum, cannot deduct a single one of them.

The health contribution can reverse the maths

The choice does not end with income tax. The basis of the health contribution is determined differently under the scale, under the flat rate and under the lump sum, and in the last case it also depends on the level of annual revenue. It happens that the form with the lower tax produces the higher total burden, which is why the comparison is always made on the combined amount — tax plus contribution — and never on the headline rate alone.

When the decision is really made

The form is chosen for a whole tax year, and the declaration of a change is filed within a deadline counted from your first revenue of that year, not from the first of January. Anyone starting a business mid-year is subject to the same mechanism: what counts is the month of the first sale.

1. Add up last year: revenue, actual costs and the total contributions you paid.
2. Run a simulation of all three variants on the same data, including the health contribution.
3. Check whether you are giving up reliefs you actually use — joint filing or the child relief.
4. File the declaration on time; once the deadline passes, the form stays for the whole year.

Records you have to keep

Under the scale and the flat rate you keep a tax book of revenue and expenses together with a fixed asset register. The lump sum requires a revenue register but no cost records — the simplest bookkeeping that exists in the Polish system. Once the statutory revenue limit is exceeded, a sole proprietorship moves to full accounting books, and that is usually the moment a company starts working with an accounting office permanently.

On top of that comes VAT, unless the business uses the exemption: sales and purchase records plus a standard audit file sent every month. Some industries cannot use the small-business exemption at all, regardless of turnover — this covers, among others, advisory work and selected legal services.

Social insurance: start-up reliefs and the deadline trap

A new business usually begins with the start-up relief, then moves to preferential contributions and only later to full rates. Each of these stages has its own duration and its own conditions. The most common mistake is missing the transition and paying too little, which the insurance institution then corrects retroactively together with interest.

• Put the end date of each stage in your calendar, not just the date you started the business.
• Check whether you are performing for a former employer the same tasks you performed as an employee — that rules out some of the reliefs.
• Remember that the reliefs cover social contributions; the health contribution is paid from the first month.

The first employee changes the category of your duties

Until you hire someone, your obligations come down to your own settlements. The first contract adds insurance registrations, payroll runs, the employee's tax advances, medical checks, initial training and annual tax statements. That is a different category of work from issuing invoices, and it is better handled by a tool than by a spreadsheet from day one — Księgowskaz Kadry keeps contracts, absences and payroll in one place, alongside the company's bookkeeping.

The right form of taxation is not the one with the lowest rate, but the one that fits the company's cost structure.