TTo accurately project future SG&A costs, some companies attempt to forecast each individual component. Some fixed costs, such as office rent, may be quite predictable. Other SG&A costs, such as shipping costs or sales commissions, will vary. Still others, such as the costs of renting new retail locations or deploying a new website, are linked to business strategy, and accurate SG&A projections depend on researching the potential costs. Fast-rising SG&A costs make it more difficult to sustain profitability, so if a company projects SG&A cost increases will outstrip revenue growth it may decide to prioritize cost-control measures for the relevant business areas.