The phrase "a flat payment" is correct and usable in written English.
It can be used to describe a fixed amount of money that does not vary based on other factors, such as time or performance.
Example: "The contractor agreed to a flat payment for the entire project, regardless of how long it took to complete."
Alternatives: "a fixed fee" or "a set amount".
Veterans today have only the Montgomery G.I. Bill, which requires a service member to pay $100 a month for the first year of his or her enlistment in order to receive a flat payment for college that averages $800 a month.
But Turner realized that for someone in Naegele's tax bracket a flat payment like that made no sense.
But the criticism was so harsh that the group changed its policy and began offering a flat payment of $200.
ASCL advocates establishing a national funding formula across the country, with a flat payment for all pupils regardless of where they live.
Under the NEF proposal, the tax-free personal allowance would be scrapped and the proceeds used to fund a flat payment of £48.08 a week for every adult.
Those who were warned of the change in the cap – customers facing redemption charges – will receive a flat payment of £250, while the others will receive payments based on the difference in repayments caused by the change in the rate.
What stops buyers is that the initial payment is some 20% lower than a flat-payment annuity would render.
This is particularly true if only a price is guaranteed, and not a specified flat payment.
A flat balloon payment is 40 years away".
Tory-led Lancashire will vote next month on plans to move to a flat shift payment of £59.16 to employers, falling to £47.43 in October.
The Hatch bill creates 10 categories of victims, offering them compensation that ranges from medical monitoring to a flat $1 million payment for people with mesothelioma, an asbestos-related cancer.
