Update Maine income tax parameters for 2025

[PavelMakarchuk]

Summary

• Add 2025 bracket thresholds for all filing statuses (single/separate: $26,800/$63,450; HOH: $40,200/$95,150; joint/surviving spouse: $53,600/$126,900)
• Update personal exemption to $5,150
• Update personal exemption phaseout start thresholds (single: $333,450; MFS: $200,050; HOH: $366,750; joint: $400,100)
• Update standard/itemized deduction phaseout start thresholds (single/MFS: $100,000; HOH: $150,000; joint: $200,050)
• Update itemized deduction cap to $36,300
• Update pension exclusion cap to $48,216 (2025 max SSA benefit: $4,018/month x 12)
• Add 2025 Tax Rate Schedule and Form 1040ME Instructions references to 24 parameter files
• Dependent exemption credit 2025 changes (multiplier, phaseout thresholds) were already encoded; added 2025 Instructions references

Note: The new pension income deduction phaseout for 2025 (per 36 M.R.S. §§ 5122(2)(M-2), 5403(8)-(10)) requires new parameters and formula changes - should be addressed in a separate PR.

Test plan

• All 208 Maine income tax tests pass
• make format applied

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (8e36043) to head (20190e3).
⚠️ Report is 106 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##             main     #7384       +/-   ##
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+ Coverage   73.03%   100.00%   +26.96%     
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  Files        3819         1     -3818     
  Lines       55013        15    -54998     
  Branches      274         0      -274     
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- Hits        40177        15    -40162     
+ Misses      14815         0    -14815     
+ Partials       21         0       -21     

Flag	Coverage Δ
unittests	100.00% <100.00%> (+26.96%)	⬆️

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[DTrim99]

PR Review

🟢 Overall Assessment: APPROVED

This PR correctly updates Maine income tax parameters for 2025 including bracket thresholds, personal exemption, deduction phaseouts, itemized deduction cap, and pension exclusion cap. All 2025 references to official Maine tax forms and rate schedules have been properly added.

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✅ What's Correct

Parameter	2025 Value	Status
Tax brackets (Single/Separate)	$26,800 / $63,450	✅ Referenced
Tax brackets (Joint)	$53,600 / $126,900	✅ Referenced
Tax brackets (HOH)	$40,200 / $95,150	✅ Referenced
Personal exemption	$5,150	✅ Referenced
Personal exemption phaseout (Single)	$333,450	✅ Referenced
Standard/itemized phaseout (Single)	$100,000	✅ Referenced
Itemized deduction cap	$36,300	✅ Referenced
Pension exclusion cap	$48,216	✅ Referenced

Reference Quality: All 24 modified parameter files now include 2025 references to:

• Maine 2025 Individual Income Tax Rate Schedules
• 2025 Instructions for Form 1040ME (with page numbers)

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🟡 Should Address (Non-Blocking)

1. Missing 2025 Test Coverage

No tests exist for the 2025 parameter values. While uprating provides some confidence, explicit tests would prevent regressions.

Recommended tests to add:

• Tax bracket boundary tests for 2025 thresholds
• Personal exemption ($5,150) and phaseout tests for 2025
• Pension exclusion cap test verifying $48,216 limit
• Itemized deduction cap test verifying $36,300 limit

2. Pre-existing Issues (Not introduced by this PR)

File	Issue
credits/dependent_exemption/phase_out/step.yaml	Trailing zero: 7.50 should be 7.5
credits/fairness/property_tax/cap.yaml	Unit typo: currency_USD should be currency-USD
credits/fairness/property_tax/cap.yaml	2024 reference title points to 2023 URL

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🟢 Suggestions (Optional)

1. The PR description correctly notes that the new pension income deduction phaseout (per 36 M.R.S. §§ 5122(2)(M-2), 5403(8)-(10)) should be addressed in a separate PR - good scoping decision.

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Validation Summary

Check	Result
Regulatory Accuracy	✅ Values match 2025 Tax Rate Schedules
Reference Quality	✅ All files have 2025 references with page numbers
Code Patterns	✅ Proper formatting, no new issues
Test Coverage	⚠️ No 2025 tests (existing tests cover 2021-2024)
CI Status	✅ All checks passing

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Summary

The PR is well-constructed with proper 2025 parameter updates and comprehensive references to official Maine revenue sources. The missing 2025 test coverage is a suggestion for preventing future regressions but is not blocking given that:

1. All 208 Maine income tax tests pass
2. Uprating formulas provide inflation-adjusted values
3. References to official 2025 forms verify the values

🤖 Generated with Claude Code

[DTrim99]

Add some 2025 tests for coverage

[MaxGhenis]

LGTM - Comprehensive update of Maine income tax parameters for 2025. All bracket thresholds, personal exemption ($5,150), phaseout starts, itemized deduction cap ($36,300), and pension exclusion cap ($48,216) are correctly updated with proper references to 2025 Form 1040ME Instructions. Dependent exemption credit base amount updated from $300 to $305 with test expectations correctly adjusted. Also fixes an incorrect NY reference URL in me_taxable_income.py. All 9 CI checks pass.