The phrase "highest sum" is correct and usable in written English.
It can be used in contexts where you are discussing the maximum total or aggregate of a set of numbers or values.
Example: "In the final round of the competition, the team with the highest sum of points will be declared the winner."
Alternatives: "maximum total" or "greatest aggregate."
An oil painting, The Steps, Irk Place, 1928, went for the highest sum – £713,250.
The letter's purpose was "people-raising" rather than fund-raising, Ms. Meyers said, because the gallery had raised $80,000 this year, the highest sum ever.
The highest sum paid in personal expenses – £33,526 – was given to Prof Gavin Henderson of the Royal Central School of Speech and Drama.
The UK has committed £125m – the second highest sum after the US although aid agencies say help is still not reaching the ground – as well as 750 troops.
Pablo Picasso's painting Women of Algiers (Version O) holds the record for the highest sum ever paid for an artwork at auction.
The second highest sum being returned is the £61,403 "profit" on the property in Kennington, south London, owned by the Democratic Unionist Gregory Campbell.
He ordered the players to pay compensation toward the cost of their prosecution, with the highest sum, about $49,600, imposed on Butt.
For this, they have a $101 million payroll, by far the league's highest sum and one that will lead to a projected $82 million luxury-tax statement.
Mattthias Prinz, the lawyer acting Alexandra, daughter of Princess Caroline and Prince Ernst August of Hanover, said it was the highest sum "ever awarded to a minor in a German trial over the rights of the press".
That is climbing towards what is believed to be the highest sum paid for any car, the $35m paid last year for another Ferrari – the 1962 GTO 250 made originally for British racing legend Sir Stirling Moss.
Michael Bolton's Love Is a Wonderful Thing: In 1994, Bolton was ordered to pay what was, until the ruling on Blurred Lines, the highest sum for a copyright case in history – over $5m.
