Use ～てもさしつかえない to state that some action or condition causes no problem or inconvenience — a formal, softened equivalent of ～てもいい／～ても問題ない. It appears in business email, contracts, and internal reports, especially when granting permission or confirming that a deviation is acceptable. Because 差し支える literally means "to hinder," the phrase frames approval as "nothing gets in the way," which sounds more deferential and less like personal authorization than ～ても構いません.