No need to go offshore. There are investment opportunities that offer deductions that can even result in return on investments not just tax avoidance.
In 2012 I set-up a legal structure for an inventor who needed investors to develop his project. I found him investors willing to become part of the project. The business plan pointed out a potential tax return during the first decade.
A single investor who worked as an employee agreed to invest US$50,000 and since that time the US$10,971.27 in salary taxes his employer paid to the IRS on his behalf where entirly refunded to him each year since 2012. Within less than 55 months he was reaching break-even.
And at the 5th year after investing he made even a ROI of 1.93% on average per year in connection to the 2012 investment. In 2017 the 6th year after investing the average annual ROI reached 5.08% and in 2018 the ROI was 7.34% on average.
This year the projected ROI will be expected to reach 9.03% on annual average to reach at the end of 10 years an annual average ROI of 11.39%
So you see it is possible to avoid taxes without going offshore and it worked and still works like clockwork!