The phrase "a substantial sum for" is correct and usable in written English.
It can be used when discussing a significant amount of money allocated for a specific purpose or expense.
Example: "The company allocated a substantial sum for the new marketing campaign to increase brand awareness."
Alternatives: "a considerable amount for" or "a significant amount for".
I'm out $631, a substantial sum for a graduate student, and a computer.
It is a substantial sum for a state with only 670,000 residents.
Ms. Sereny was also pilloried for paying Ms. Bell a substantial sum for her participation — many accounts said £50,000.
"Star Wars: Episode II -- Attack of the Clones" made $302 million in American theaters last summer, a substantial sum for any film.
Ileana Sonnabend, his Paris dealer and Castelli's ex-wife, owed him a substantial sum for European sales, so he got her to buy him a classic Ferrari.
Earlier this week HarperCollins paid a substantial sum for 18-year-old Abigail Gibbs's first novel The Dark Heroine, which was discovered on social reading website Wattpad.
As noted above, the Daily Telegraph paid a substantial sum of money for the information which led to the MPs' expenses scandal and I have made no criticism of the Telegraph's decision to pay that money.
pic.twitter.com/FzmOWHizK7 The article went on to reference The Sun's lead story on Brand earlier this week, which alleged he had been paying a substantial sum of rent for a luxury loft apartment in Hoxton to a company, who it claimed avoided tax by being based in the British Virgin Islands.
On accepting, I was sent a lovely letter of thanks from the CEO with a request for a substantial sum of money -- at least for me.
By the Treaties of Stockholm (1719 20), Sweden, Saxony, and Poland returned to the status quo ante bellum, and Denmark gave back its conquests to Sweden in return for a substantial sum of money.
