Many people get confused about tax filing in Nigeria because they mix up personal income tax and company income tax

Let me explain

The First thing you must understand is that Personal income tax and company income tax are not the same

If your business is a small business under your name like a sole proprietorship or enterprise, then you will file personal income tax

If your business is registered as a limited liability company, then it will file company income tax

Now let me explain the timing in a way that even Mama Ngozi that sells Tomatoes in the Village will understand.

Imagine:

Mama Ngozi starts her tomato business in January 2026

From that day, she begins to record everything she sells and all her income

She cannot file tax immediately because she has not completed one full year of business

She will keep records from January to December 2026

After the year ends, she will now calculate everything she made

Then she will file her tax in 2027

That is how it works

Now here is the key difference many people don’t know

Personal income tax deadline is always March 31 every year

Company income tax is usually filed after the company has completed 12 months of operation

Let me tell you Another important truth

Even if you just started a business in 2026, if you had personal income in 2025, you are still expected to file your personal income tax for 2025 before March 31 2026

That is because tax is always based on the previous year

Another important thing is business commencement date

YES… When you register with FIRS, now Nigeria Revenue Service, they will ask for your business start date

That date is very important because that is when your tax record begins

From that date, you count 12 months of business operation before filing

In Simple English…

If it is personal income tax, file every year before March 31

If it is company income tax, file after one full year of business

Tax is not about when you register, it is about when you start earning and recording income

Once you understand this, you will never miss your tax deadline again and you will stay compliant without stress