Missouri Merchandising Practices Act (MMPA) — Post-2020 SB 591

The Missouri Merchandising Practices Act (MMPA) — codified at Mo. Rev. Stat. § 407.010 et seq. — prohibits deceptive practices in trade or commerce. For vehicle defect cases, MMPA adds punitive damages under § 407.025(1) and mandatory attorney fees. However, the 2020 SB 591 reforms significantly narrowed MMPA’s historical strength — requiring careful post-SB 591 pleading.

What MMPA prohibits

§ 407.020 prohibits “the act, use or employment by any person of any deception, fraud, false pretense, false promise, misrepresentation, unfair practice or the concealment, suppression, or omission of any material fact in connection with the sale or advertisement of any merchandise…”

For vehicle cases, key MMPA hooks include:

Misrepresentation of vehicle condition, options, history.
Failure to disclose prior damage, salvage, known defects.
Deceptive warranty practices.
Deceptive F&I add-on practices.
Lemon Law violations historically MMPA per se (post-SB 591 requires specificity).

The 2020 SB 591 reforms

Missouri Senate Bill 591 (effective August 28, 2020) made the following changes to MMPA:

1. Ascertainable loss requirement

§ 407.025(1) now requires plaintiff to plead and prove “ascertainable loss of money or property, real or personal” with specificity. Historic broad pleading is no longer sufficient.

For vehicle cases, ascertainable losses include:

Purchase price.
Sales tax + registration.
Finance charges.
Repair costs (out-of-warranty).
Diminished value (with expert testimony).
Cost of substitute transportation.

2. Reasonable consumer standard

The deceptive practice must be material to a reasonable consumer. Subjective complaints alone are insufficient.

3. Heightened pleading requirements

§ 407.025(7) — fraud-like specificity now required for MMPA pleadings. Allegations must include who, what, when, where, why with detail.

4. Caps on intangible loss

Emotional distress, mental anguish, and intangible losses are limited.

5. Punitive damages standards

Punitive damages must meet heightened “clear and convincing evidence” standard for willful, wanton, or reckless conduct.

6. Class action limitations

§ 407.025(8) — additional procedural barriers to class actions.

Punitive damages — discretionary

Under § 407.025(1), Missouri courts may award punitive damages for willful violations:

Discretionary — court “may” award.
Post-SB 591: clear and convincing evidence standard.
Common-law based — Missouri’s general punitive damages framework applies.

Strong cases with clear manufacturer knowledge + refusal to cure remain MMPA-actionable.

Mandatory § 407.025(1) attorney fees

Although § 407.025(1) says “may,” Missouri courts treat MMPA fees as functionally mandatory for prevailing plaintiffs — provided pleading meets post-SB 591 standards.

5-year SOL

Under § 516.120(2), MMPA actions must be brought within 5 years from the violation. Among the longer UDAP SOLs:

Missouri MMPA: 5 years.
Pennsylvania UTPCPL: 6 years.
Minnesota Private AG Statute: 6 years.
Connecticut CUTPA: 3 years.
Tennessee TCPA: 1 year — shortest.

The 5-year MMPA SOL provides solid runway after the 1-year Lemon Law window closes.

MMPA in vehicle-defect cases

Post-SB 591 best practices:

Plead ascertainable loss with specificity — itemized damages list.
Establish reasonable-consumer materiality — survey evidence, market data.
Document manufacturer knowledge — TSBs, prior complaints, recall history.
Itemize repair costs and diminished value.
Avoid vague intangible damage claims.

Pre-suit notice — strongly recommended

MMPA does not require pre-suit notice, but best practice is to send notice giving the manufacturer opportunity to cure. This:

Triggers willfulness analysis (post-notice refusal supports willful conduct).
Preserves punitive damages exposure.
Shifts settlement leverage.

Bottom line

MMPA was narrowed by 2020 SB 591 but remains a meaningful Missouri remedy layer — providing punitive damages, mandatory attorney fees, and 5-year SOL. Post-SB 591 pleading requires ascertainable loss specificity — careful attorney drafting is essential.

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