The phrase "a hefty increase on" is correct and usable in written English.
It can be used when discussing a significant rise in a quantity, price, or value of something.
Example: "The company reported a hefty increase on their quarterly profits compared to last year."
Alternatives: "a substantial rise in" or "a significant boost to".
To spell out the details: HL is distributing a total of 90% of post-tax profits and the 10.1p a share payment is a hefty increase of nearly 30% on last year.
Restrictions on Internet advertising, a hefty increase in the tax on tobacco products and new antismoking campaigns are also among the initiatives.
However, others close to the Labour leader favour raising revenue through a hefty increase in the levy on banks.
It would raise money to subsidize policies for low-income residents through what Mr. Schwarzenegger calls shared responsibility — a tax on hospital revenues, a hefty increase in tobacco taxes and assessments on employers who do not contribute to their workers' health care.
This year, Hobart City Council announced a contribution of $700,000 for the next three years of the festival, with the state government handing over $2.1m for 2016 alone (a hefty increase from the $3m bestowed on the festival for the three years prior).
On May 22nd Morgan Stanley's board approved a hefty increase in the base pay of several senior executives, including its two co-presidents, whose salaries are rising from around $300,000 to $800,000 a year.
House Republicans have proposed an alternative package including a 5% income-tax cut, a freeze on dividend and capital-gains taxes and a hefty increase in the deductions families can claim for children.
On the factory floor, production is expanding, a point underscored by government data released Friday showing a hefty increase in March for orders of long-lasting manufactured items.
The review led to a hefty increase in pay, a symptom also of a generally lax approach to public finances.
