Have and have got

There is no difference in meaning between these two sentences:

I have a car.
I‘ve got a car.

The important thing is not to mix the two forms.

If you use the “have” form, have is the main verb and so to make a question or negative sentence, we need an auxiliary verb:

Have

Tense	Positive	Negative	Question
Present simple	I have a car.	I don’t have a car.	Do you have a car?
Past simple	I had a car last year.	I didn’t have a car last year.	Did you have a car last year?
Present perfect	I have had a car for a long time.	I haven’t had a car for long.	Have you had a car for long?
Future with will	I’ll have a car soon.	I won’t have a car soon.	Will you have a car soon.

Have got

Positive	Negative	Question
I’ve got a car.	I haven’t got a car.	Have you got a car?
I’ve got brown eyes.	I haven’t got brown eyes.	Have you got brown eyes?

Note we use the “have got” form only in the present.
With “have got”, the auxiliary verb is have and the main verb is got.

Look at the difference when we make a question

	Question word	Auxiliary	Subject	Verb
Have	What kind of car	do	you	have?
Have got	What kind of car	have	you	got?

When we write in a formal way we usually use the “have” form and not the “have got” form.