What form is utilized to calculate the tare weight correction factor?

The tare weight correction factor is specifically calculated using PS Form 8040. This form plays a crucial role in shipping and mailing processes by measuring the actual weight of a package minus its tare weight—the weight of the packaging itself. By using PS Form 8040, mailers can ensure that they are accurately accounting for the weight that will be charged by postal services, which can impact shipping costs and logistics.

The other forms mentioned do not serve this purpose: PS Form 3615 focuses on postage statements, PS Form 2866 is related to shipping and customs, and PS Form 1000 deals with postal service forms for merchandise. Therefore, selecting PS Form 8040 is the correct choice as it directly pertains to the tare weight correction factor calculation.