There is no immediate need for people to panic and remake their will, according to Birmingham solicitors Williamson & Soden.
It follows the Government rethink over taxing trusts confirmed in the Financial Bill 2006.
"The amendments to the Finance Bill 2006 in respect of taxation on assets over and above £285,000 held in Interest in Possession Trusts and trusts for bereaved young people are welcome, because they are not as far reaching as originally proposed," said solicitor Catriona Attride, who heads the private clients team.
"There is no longer an urgency for individuals to review wills, but it is important the arrangements in place are appropriate and practical, especially if they have made provision for assets to pass to minors."
Tax and legal advisers criticised the way proposals were rushed through in the Budget without consultation and campaigned vigorously for amendments.
A number of revisions were made and the new rules become law this month.
The spouse exemption on a gift under a will to a widow or widower left an IIP trust will be retained.
IIP trusts for spouses are used for a number of reasons notably by people in second marriages who use them to make provision for their spouse while securing the underlying capital for children from previous relationships.
The Government has also relaxed its stance on IHT payable by children.
Trusts that pay out to beneficiaries at 18 will not be affected by the new regime, while a proportionate charge of up to 4.2 per cent is payable on trusts that distribute assets to beneficiaries aged 18 to 25.
The new rules will impact on children over 18 due to inherit over the nil-rate band. Although changing a trust so beneficiaries inherit at 18 is an option, Ms Attride points out circumstances and the p ersonalities of those involved, may mean this is not viable.
"The changes to the Inheritance Tax of trusts are complicated," she said. "We are pleased that the Government has responded to lobbying by 11 professional bodies and although the revisions do not go as far as we would have liked, they are certainly a step in the right direction.
"In our opinion the majority of people will remain unaffected by the changes."