# Guides: worked examples for duty and print usage

As of 2026-10-23 (USITC HTS 2026 Revision 21), StoreCalc uses explicit purchase and layout assumptions to explain rate gaps, entry fees, film usage, origin savings and what each fulfillment route costs. Each guide links back to its calculator.

https://storecalc.com/en/guides/

## [Why US import duty differs so much between cotton and polyester](cotton-vs-polyester.html)

Compare cotton and synthetic general rates, China totals and duty per unit on the same shipment.

## [How to allocate MPF per unit](mpf-per-unit.html)

See how informal entry, the formal-entry minimum and the cap affect fees per unit at different shipment values.

## [How much DTF film do you need, and does rotation save any?](dtf-film-rotation.html)

Compare upright, rotated and automatically selected layouts at the same roll width, margins and spacing.

## [How much duty can production in Vietnam or Bangladesh save?](origin-savings.html)

Compare total rates and duty savings per unit across origins for common apparel, hats and totes.

## [US fulfillment vs shipping from China: what one T-shirt really costs](us-vs-china-fulfillment.html)

The same 180 gsm cotton tee with a front DTF print: product price, shipping, import duty and delivery time compared.

## Sources and data date

[Site data sources and methodology](../sources.html)