# Wisconsin · retail · cost floor — State below-cost motor fuel selling laws and minimum-markup percentages

For Wisconsin · retail · cost floor, state is Wisconsin; applies to is retail; rule is cost floor; law name is Unfair Sales Act; statute citation is Wis. Stat § 100.30, recorded from its source on 2026-08-20; source re-checked 2026-09-01.

- **State:** Wisconsin _(our reading, not quoted from the source)_
- **Applies to:** retail _(our reading, not quoted from the source)_
- **Rule:** cost floor _(our reading, not quoted from the source)_
- **Law name:** Unfair Sales Act _(verified: appears in the quote below)_
- **Statute citation:** Wis. Stat § 100.30 _(verified: appears in the quote below)_
- **How "cost" is defined:** the greater of either invoice or replacement cost (as noted above) plus a cost of doing business markup of 6%, or the “average posted terminal price” plus a cost of doing business markup of 9.18%. _(verified: appears in the quote below)_
- **Fixed markup percentage:** 6% _(verified: appears in the quote below)_

## What the source says

> The statutory definition of cost for retail sales of motor vehicle fuel is the greater of either invoice or replacement cost (as noted above) plus a cost of doing business markup of 6%, or the “average posted terminal price” plus a cost of doing business markup of 9.18%.

## Source

- https://datcp.wi.gov/Pages/Programs_Services/UnfairSalesAct.aspx

Last verified: 2026-09-01. Review by: 2027-02-16.
Part of [State below-cost motor fuel selling laws and minimum-markup percentages](https://referencesource.org/motor-fuel-minimum-markup-laws-by-state/).