Consultants and freelancers: the most common mistakes when opening a PJ

Opening a company seems simple: register it with the commercial board, get the CNPJ (company tax ID), issue invoices. But anyone who jumps in without planning stumbles into mistakes that are expensive to fix. Vivian Sampaio lists the five most frequent mistakes among consultants and freelancers and shows how to avoid them.

Why do consultants and freelancers make mistakes when opening a PJ?

The main reason is a lack of information at the moment of formation. Often the professional rushes to get the CNPJ in order to close a contract and skips a full analysis of what the corporate structure actually requires. The result: the wrong tax regime, an inappropriate CNAE (economic activity code), no separation of personal and business assets, and the surprise of monthly obligations that were never on the radar.

No tax planning before opening

The most serious mistake is opening the company without defining the tax regime. The choice between Simples Nacional (simplified tax regime), Lucro Presumido (presumed-profit regime) and Lucro Real (actual-profit regime) must be made before registration, because it affects pró-labore (owner’s salary) planning, the cost structure and the profit-distribution strategy.

The calculation to identify the best regime considers:

• Expected average monthly revenue
• Operating expenses (rent, employees, tools)
• Growth projection over the next 12 months
• Withdrawal goal (pró-labore or profit distribution)

Without this calculation, the professional pays more tax than necessary for years — and only realizes it when the accountant runs a review.

Mistaking the company for a personal checking account

A single account is the everyday mistake. When the professional uses the company account as an extension of the personal one, they lose control over:

• how much is available for distribution
• how much they need to pay in taxes
• how much is being reinvested in the business

The tax consequence: loss of control. The operational consequence: surprises at the quarterly or annual close, when taxes turn out higher than expected.

Mistake 1: choosing the wrong tax regime

The wrong regime is the mistake that costs the most money. It stays invisible while revenue is low and becomes a growing problem as income rises.

Signs that you are in the wrong regime

• You pay an effective tax burden above 15% of revenue and don’t understand why
• Profit distribution is being limited by Simples Nacional (simplified tax regime) rules
• The “fator r” (payroll-to-revenue ratio) is not being optimized
• You bill more than R$ 60,000/month and stay in Simples without any analysis

How to fix it without closing the company

The regime correction is done by the accountant when changing the corporate structure or choosing the assessment regime. The accountant can evaluate the change at the start of the calendar year, and the switch is made by filing the DEFIS (Simples Nacional information return) at the start of the following fiscal year.

Important: changing the regime does not require closing the company. It is done through a registry update and a change of tax regime.

Mistake 2: not separating personal and business finances

A single checking account: tax consequences

When all financial activity flows through a single account, the tax authority may consider that there is no separation between personal and company assets. This compromises the asset protection that the corporate structure is supposed to provide.

Moreover, without control of inflows and outflows, tax assessment is compromised: personal expenses get confused with corporate ones, and actual or presumed profit becomes distorted.

How to separate correctly

The minimum correct structure includes:

1. A business bank account (CNPJ as the holder)
2. A fixed monthly transfer to the personal account (pró-labore or distribution)
3. Keeping receipts for all corporate expenses
4. Monthly bank reconciliation between the company account and the personal account

This is not bureaucracy — it is protection. And it is what allows the company to truly exist in the eyes of the tax authority.

Mistake 3: choosing a CNAE incompatible with the activity

The wrong CNAE triggers assessments

The CNAE (National Economic Activity Code) defines the classification of the company’s main activity. Using a CNAE that does not reflect what the company actually does is a documentary mismatch that the Federal Revenue detects through data cross-checks.

Example: a marketing consultant with a “software development” CNAE will have a discrepancy between what they declare as revenue and what the CNAE suggests the company does. The result is a request for explanations or, in serious cases, an assessment.

How to choose the right CNAE for consulting

The most common CNAEs for consultants include:

• 62.01-5: Data processing and internet hosting (IT consulting)
• 63.11-9: Portals and information services (digital consulting)
• 73.19-0: Advertising agencies and market research (marketing consulting)
• 70.22-0: Business management consulting (business consulting)
• 82.99-7: Telemarketing activities (for operations consultants)

The rule: the CNAE must reflect the main activity — the one that generates most of the revenue. Secondary CNAEs are allowed for complementary activities.

Mistake 4: not having advisory accounting

Why Simples Nacional is not enough

Having a CNPJ under Simples Nacional (simplified tax regime) is not the same as having an optimized tax structure. Simples is a simplified regime, but it is not a regime designed for revenue growth.

As revenue increases, Simples charges progressive rates that can reach 33% of revenue. Revenue of R$ 100,000/month under Simples can result in a tax burden of R$ 28,000 to R$ 33,000 — whereas under Lucro Presumido (presumed-profit regime) the burden would be around R$ 11,200 + ISS.

The value of an accountant who understands your business

The ideal accountant for a consultant or freelancer is not the one who only does the monthly bookkeeping — it is the one who:

• Understands the dynamics of variable revenue
• Calculates the “fator r” and optimizes the payroll
• Reviews the tax regime annually
• Advises on profit distribution and pró-labore
• Warns before deadlines, not after

Does this accountant charge more? Yes. But the tax savings they generate usually pay for themselves within the first three months.

Mistake 5: not planning monthly tax payments

The Federal Revenue does not forgive delays

Paying taxes late generates interest (SELIC + 1%) and fines that can reach 75% of the amount due. For overdue taxes, the Federal Revenue offers no forgiveness — only installment plans, which charge heavy interest.

Organizing cash flow for monthly tax payments must be done from the first month of operation. The accountant should provide a tax due-date calendar with the estimated amounts.

How to organize the tax cash flow

Three essential steps:

1. Identify the taxes the company must pay (GPS, IRPJ, CSLL, ISS, Simples)
2. Calculate the estimated monthly amount based on revenue
3. Set aside a fixed percentage of revenue for tax payments (suggestion: reserve at least 25%)

In practice, many consultants discover they are behind on taxes only when the accountant presents the quarterly DARF. Prevention is monthly control.

How to avoid these mistakes from the start

The path to avoiding the five mistakes is simpler than it seems:

1. Run the tax-regime calculation before opening the company. The accountant can project the best regime based on expected revenue.
2. Open a business bank account on day one. Don’t wait for the first month.
3. Choose the CNAE that reflects the real activity. Not the one that seems simplest.
4. Hire an accountant who understands consultants and freelancers. Not a generic accountant.
5. Set the monthly tax-payment calendar in the first month. And set the money aside.

These five mistakes come exactly from the kind of concrete question that gives rise to the content of the Naprática hub: we start from what we hear in our advisory work — not from theory — to show where opening a PJ truly gets expensive when done on improvisation.

For IT professionals weighing the move from CLT (employee status) to PJ, see the full analysis in this article.

And if you have already opened the company and want a review, talk to the VMAHUB team to identify where the mistakes are and how to fix them.

If you don’t yet have an organized filing system, see how to open a company as an independent professional to structure it from the start.

And if you want a personalized analysis, talk to the VMAHUB team.

For freelancers and IT professionals deciding between CLT and PJ, check out this full analysis.

For professionals in other fields who are also weighing the change, check out the full analysis of the tax regime for doctors — the logic is the same.