---
schema_version: "secwatch.filing_event.v1"
accession: "0000943374-23-000391"
form_type: "8-K"
ticker: "MBBC"
cik: "0001835385"
company_name: "Marathon Bancorp, Inc. /MD/"
filed_at: "2023-09-20T23:59:59+00:00"
generated_at: "2026-06-10T12:28:04.254133+00:00"
event_type: "other_material"
sentiment: "negative"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# Marathon Bancorp restates FY2022 & FY2023 quarterly statements due to deferred tax liability error

## Summary
- Audit committee concluded prior audited FY2022 and unaudited quarterly periods from Sep 2021 to Mar 2023 should no longer be relied upon.
- Error: erroneously recorded a deferred tax liability for pre-1988 excess tax bad debt due to misinterpretation of thrift status after 1993 charter conversion.
- Correction requires a $481,798 adjustment to opening retained earnings as of July 1, 2021.
- Unrecaptured pre-1988 federal bad debt reserve of ~$1.5 million; no deferred tax liability provided as management does not intend to trigger recapture.
- Restated financials will be included in the pending FY2023 10-K.

## SEC filing metadata
- accession: 0000943374-23-000391
- form_type: 8-K
- ticker: MBBC
- cik: 0001835385
- company_name: Marathon Bancorp, Inc. /MD/
- filed_at: 2023-09-20T23:59:59+00:00
- event_type: other_material
- sentiment: negative
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 4.02
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1835385/000094337423000391/0000943374-23-000391-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1835385/000094337423000391/form8k_091923.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000943374-23-000391
- JSON: https://secwatch.observer/filing/0000943374-23-000391.json
- Plain text: https://secwatch.observer/filing/0000943374-23-000391.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.