https://knowledgenavigator.pwc.com/vat-gst-global/news/revenue-regulations-on-vat-reliefs-for-persons-with-disability-pwd/
Revenue Regulations on VAT reliefs for Persons with Disability (PWD)
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https://www.legislation.gov.uk/sdsi/2025/9780111063712/contents/data.xht?view=snippet&wrap=true
The Revenue Scotland and Tax Powers Act (Record Keeping) Amendment Regulations 2025 No. 375
https://www.irs.gov/ht/retirement-plans/treasury-regulations
Treasury regulations | Internal Revenue Service
Final and proposed IRS positions on the interpretation of Internal Revenue Code sections specific to retirement plans.
treasuryregulationsinternalrevenueservice
https://www.irs.gov/privacy-disclosure/tax-code-regulations-and-official-guidance
Tax code, regulations and official guidance | Internal Revenue Service
Different sources provide the authority for tax rules and procedures. Here are some sources that can be searched online for free.
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https://www.irs.gov/vi/faqs/irs-procedures/code-revenue-procedures-regulations-letter-rulings
Code, revenue procedures, regulations, letter rulings | Internal Revenue Service
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https://find.library.upenn.edu/catalog/9952031793503681
Regulations 45. Relating to the income tax and war profits and excess profits tax under the Revenue...
Access 'Regulations 45. Relating to the income tax and war profits and excess profits tax under the Revenue Act of 1918.' through the Penn Libraries catalog.