The Government has said that it is still awaiting "exact clarity" on tariffs following the decision by the US Supreme Court last week to strike down President Donald Trump's trade taxes.
A new 10% global replacement levy was introduced by the United States, with a threatened 15% tariff delayed for now.
Minister for Enterprise Peter Burke said nobody has "exact clarity" at this point in time.
He said the legal effect at the moment is for a 10% tariff and said that has an effect whereby, "it is added to the average tariffs of the EU, so that will bring it to about 14.5%".
"Working with the EU, working with Trade Commissioner Maroš Šefčovič, we're trying to stabilise the relationship, trying to get on a very solid, predictable footing again," Mr Burke added.
Asked if the court ruling undermines the trade deal reached last year between the EU and US, Minister Burke said he hopes not.
"I think that framework is very important for the carve outs that we have achieved. A lot of great work has been done in relation to the 15% deal, particularly in areas that are strategically important to the European economy."
Mr Burke advised business who export to the US to "keep doing what you're doing" and said it is important that Ireland always has a "a calm, cool, measured approach".
"That has stood us in good stead over the last number of months, and indeed years, in terms of the relationship, and it's absolutely vital that we continue along that modus operandi and work to try and ensure that we carve out new opportunities," the minister said.
"Despite all the noise, despite threats that have been ever present, trade continues to flow and it does so very freely between the EU and the US, and that's important."
The minister was speaking at the US Ambassador's residence in Dublin's Phoenix Park at a celebration for Irish companies with operations across the Atlantic.
The event was hosted by Ambassador Edward Walsh to highlight Irish firms investing and expanding in the US, "with a focus on those establishing operations through manufacturing and job creation".
The ambassador and minister will lead a delegation of around 40 Irish companies to the Select USA Investment Summit in Washington in May.
In an address, Ambassador Walsh said the Supreme Court's ruling "doesn't change the facts on the ground".
"We still have the largest trade deficit in the history of the world, and if we don't do something about it our economy will be in trouble," he added.
"President Trump has invoked Section 122 of the Trade Act of 1974 to impose a 10% universal, baseline tariff. This Section 122 action is similar in scope to existing tariffs. Per the law, this 10% tariff will last for 150 days.
"And that's all I have to say about that," Ambassador Walsh said.
Businesses attending the event said the renewed uncertainty is causing difficulties in planning.
Mary Sadlier, Chief Executive of Irish cream liqueur company Coole Swan, said prices have been kept low by certainty, but said now there is "so much volatility out there and we'd like to see it levelled off".
"We're effectively in the same position, vis-à-vis the pricing and the costing, but the uncertainty is a big issue.
"We're in the same position as we were on Friday. The 15% remains. But we don't know in 150 days where you're going to be," she said.
Ms Sadlier has called for "stability" and said if the tariff is going to going to be 15%, "let's call it, let's try and bed it down".
"It's the 150 days that's causing the problem. Because where do you go in 151 days? And does somebody order from me now, or do they wait 151 days when maybe there's no duty?"
The CEO of the Co Meath-based company said there is a "constant kind of guessing and difficulty being able to plan".
"So, if we could just get it where we just agreed it and it was there for the next 20 years, ten years or two years, we'd be very happy."
