What are the procedures I need to complete as a trustee of a 7 figures inheritance settling?

Why do you keep mentioning 7 - figures as if this is relevant? If you are the trustee you are the trustee whether you have a trust of 2 cents or 2 million. However, if you have a trust over a million then you can afford to hire an estate/probate/trust lawyer to assist you with the necessary paperwork (accountings) and to have the money managed properly for the trust beneficiaries as well as other professionals (CPAs, money managers, etc.). The trust document should indicate what law governs the administration of the trust. It will not matter where the beneficiary or you live - what matters is the law governing the trust. If the beneficiary lives out of the country and the trust is in the US there may taxes that the beneficiary will pay from any disbursements in his/her country. Trusts are taxed by the state where the trust is located and the federal government. You would need to consult a tax professional about taxes if the lawyer is not a CPA or tax attorney. Many lawyers who handle large estates/trusts are qualified to give tax advice (I am not) or else they practice in a large firm that has such professionals on staff. Others are not and would require you to get a CPA. Avoid places like H&R Block or Jackson Hewitt. You have a complicated situation and you should go to a competent CPA familiar with all estate/trust taxes. Any fees for this advice or legal advice will be paid by the trust as a trust expense. If the trust is in trust is in Great Britain then you will need a solicitor who is familiar with and licensed to practice law in that country (England, Wales or Scotland). As a trustee you are bound (in the US at least) by what is called the "prudent man" or "prudent investor" rule. You are obligated to invest the money in the types of reasonably safe securities/banks/investment vehicles/assets that a reasonably prudent person would. Great Britain may have a similar requirement, but you would confirm that with the solicitor. That does not mean you stick the money in a money market account where you are earning zilch. However, it may entail you going to a company that is reputable and having the company manage the money for you. The company would allocate the money in to stocks and bonds which have a higher rate of return. Again, this would be a trust expense and if you have a 7-figure trust to administer then the trust can well afford to incur this expense to have the property managed correctly.