Today's phrase is: Technically speaking.

"I've had a look at your books and, technically speaking, you should be paying tax on your income from overseas customers."
"I thought I was."
"Well, you are but not enough given the current regulations."
"Is there any way round this?"
"There is a loophole that allows you to pay this sort of income into an off-shore account. That means you wouldn't have to declare it in this country."
"Can you set that up for me?"
"It'll take a couple of weeks but it shouldn't be a problem."

Useful words and expressions:

books - financial accounts.
technically speaking - according to an official interpretation of the facts.
overseas - foreign.
a way round - a way to avoid something.
loophole - a mistake in the way a law has been written that allows people to avoid the doing what the law states but without breaking any law.
offshore account - bank account in a country that has more relaxed tax rules than your own.
declare - officially report something, e.g. your income to the tax
authorities.
set up - arrange.
a couple - two.