Web - Expense - Tax rate column shows the default tax rate when tax rate is deleted

[lanitochka17]

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Version Number: 9.3.58-2
Reproducible in staging?: Yes
Reproducible in production?: N/A - new feature, doesn't exist in prod
If this was caught during regression testing, add the test name, ID and link from BrowserStack: #84769
Email or phone of affected tester (no customers): sdjnsoidjiondjosjsoj@gmail.com
Issue reported by: Applause Internal Team
Bug source: Exploratory - Significant User Experience Deterioration
Device used: Mac 26.2 / Chrome
App Component: Money Requests

Action Performed:

Precondition:

• Enable Taxes in workspace settings.

1. Go to staging.new.expensify.com
2. Go to workspace chat.
3. Create two expenses with 5% tax rates.
4. Go to workspace settings > More features.
5. Disable Taxes.
6. Open the expense report from Step 3.
7. Open any expense.
8. Click Tax field.
9. Click Delete tax.
10. Close report RHP.

Expected Result:

Tax rate column should be empty because tax rate is deleted.

Actual Result:

Tax rate column shows the default tax rate when tax rate is deleted.

Workaround:

Unknown

Platforms:

• Android: App
• Android: mWeb Chrome
• iOS: App
• iOS: mWeb Safari
• iOS: mWeb Chrome
• Windows: Chrome
• MacOS: Chrome / Safari

Screenshots/Videos

Bug7127008_1775845494597.14.mp4

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[melvin-bot]

You have been assigned to this deploy blocker because you recently merged this PR: #84769

[melvin-bot]

💬 A slack conversation has been started in #expensify-open-source

[github-actions]

👋 Friendly reminder that deploy blockers are time-sensitive ⏱ issues! Check out the open `StagingDeployCash` deploy checklist to see the list of PRs included in this release, then work quickly to do one of the following:

1. Identify the pull request that introduced this issue and revert it.
2. Find someone who can quickly fix the issue.
3. Fix the issue yourself.

[OSBotify]

Classification: Frontend bug | Causing PR: #84769 by @dominictb (High confidence) | Recommendation: REVERT

[OSBotify]

Evidence: PR 84769 (merged 2026-04-09) is in StagingDeployCash and was identified by melvin-bot. The bug is staging-only (new feature, not in production). The PR modifies src/components/ReportActionItem/MoneyRequestView.tsx, src/libs/Violations/ViolationsUtils.ts, and src/libs/MergeTransactionUtils.ts - all directly related to the affected tax functionality.

[OSBotify]

Root cause: PR 84769 introduces showTaxDisabledAlert() which calls updateMoneyRequestTaxRate with taxCode set to empty string to delete the tax. The getTaxName utility in src/libs/TransactionUtils/index.ts (line 2155) has this fallback: (transaction?.taxCode || defaultTaxCode). Since empty string is falsy in JS, this evaluates to defaultTaxCode after deletion, so getTaxName returns the workspace default tax rate name instead of undefined. The taxRateValue in MoneyRequestView then falls through to taxRateTitle and displays the default tax rate name rather than an empty field - matching the observed bug. Assigned: @dominictb @hoangzinh @youssef-lr @trjExpensify