How much work could you lose before a price change costs you money?
Contribution now is (price now − cost to deliver) × how many a month. At the new price, the number needed to keep that contribution is contribution now ÷ (new price − cost to deliver). Work you could lose is how many a month less that number.
- Not factored in
How price-sensitive your customers are: the threshold is the answer to that question, not an input to it.
Season, and the month the change lands in.
A rival opening, closing or moving price.
The VAT registration threshold, where turnover is near it.
The wider economy.
- Worst and best case
The new price settles a little low, in a quiet month.
The new price holds, in a busy month.