Businesses will be required to declare profits from overseas if they are to claim tax relief on their Irish income tax.
It will apply to companies that do not have a physical presence in Ireland and are in a country that does not tax the company.
The rules are meant to prevent multinationals hiding profits overseas to avoid paying tax.
Businesses that are located in a tax haven, such as Singapore, can use the overseas tax rules to avoid reporting their profits to the tax authorities.
If a company has a turnover of more than €100m it will be able to declare that profit as an overseas income.
This is because the value of a company’s assets is determined by the tax system.
Companies that have a turnover greater than €1bn, for example, would be able get a tax deduction on that turnover, rather than a deduction for a loss.
Companies in the tax haven can use foreign tax credits to offset the value they have made abroad, and then claim a tax credit on any earnings in Ireland, which is taxed at the lower rate.
The main point of the tax-saving rules is that it will help businesses in Ireland that do nothing in the country.
The government has proposed a bill that will be introduced next week that will provide tax relief for the country’s biggest multinationals and is expected to be voted through.
It is likely to be challenged in the Irish courts.
The UK has also introduced a new tax-sheltering system that will allow the UK’s biggest companies to claim a 10% tax credit if they have less than €150m of turnover in the UK.
The plan is designed to encourage businesses to move to Ireland to avoid the tax.
The US and the EU have similar tax-dodging plans.
The plans have been opposed by the UK government, which says that the tax avoidance will undermine public services and create a huge burden on taxpayers.
The European Union has said that the plans will hurt the UK and the economy.
The tax-savings plans have also been criticised by Irish businesses, which have been asked to prove that they have created jobs in Ireland by bringing their businesses into the country, while not claiming a tax break on overseas income and therefore benefiting from the tax savings.
There is also opposition in the US, where President Donald Trump has also threatened to withdraw from the Trans-Pacific Partnership (TPP) trade deal, which was designed to boost trade with other countries.
Ireland has been in the talks for two years, which has been a lengthy process.
The negotiations are now in their fourth year and are expected to take a further year.
The EU has also been in negotiations for over a year.