Yes, they can if the country where your offshore company is registered automatically exchanges fiscal information with other national states. If the country where your company is domiciled is not a member of this group, your tax authorities can request the information from the bank where your company has a corporate account. The list of countries working by the CRS (Common Reporting Standards) and exchanging fiscal information is constantly growing, so you cannot conceal your offshore company ownership from the tax authorities in your home country.