The round table debate was organised in Zagreb on Monday by the Croatian Tax Payers' Association (HUPA).
Frequent changes are harmful for the business community, and cause a lack of trust in the system, rendering the well-thought business planning impossible, participants in the event said.
The first task of a tax system is to help enhance the country's competitiveness, economist Guste Santini said.
"Fiscal and social functions of taxes should be respected as much as possible, but the tax systm must aims at the increasing of the competitiveness," Santini told the round table debate.
He went on to say that a tax system reform must prefer economic effects to the largest possible extent.
Tax expert Srdjan Kliska called for the retainement of all current forms of excise duties and for increasing their share in tax revenues.
Amendments to the income tax law and to the law on special crisis tax went into force on 1 July, enabling 1.48 million Croatians to get higher salaries for July.
On 1 July the lower crisis tax rate of two percent on salaries and pensions ranging between HRK 3,000 and 6,000 was revoked. This applies on salaries of some 720,000 employees and pensions of 190,000 pensioners, the tax administration has reported.
The amendments to the income tax law introduce new tax rates on the income of 12, 25 and 40 percent.
The three income tax rates will replace the previous four rates. Thus, the 12-percent tax is imposed on incomes by HRK 3,600, 25-percent on incomes from HRK 3.601 to HRK 10,800 and 40-percent on incomes exceeding HRK 10,800.
In addition, some parafiscal charges are reduced.
However, some tax reliefs are abolished such as the payment of life insurance premium, private additional health insurance and the payment into the voluntary pension funds in the so-called third column.