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United States Financial Glossary

Learn the definitions of key financial terms, tax acronyms, and mortgage jargon commonly used in United States. Updated for 2026.

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US financial terms you need to know in 2026

The One Big Beautiful Bill Act changed the game for American families in 2025. New tax-advantaged accounts, tip and overtime deductions, and IRS penalty relief programs created terminology that did not exist two years ago. This glossary covers the specific Section 530A, OBBBA, and IRS procedural terms that apply to your 2025-2028 tax filings.

Section 530A Trump Accounts and OBBBA deductions

The OBBBA introduced four new above-the-line deductions (tips, overtime, senior, auto loan interest) and a new children's investment account (Section 530A). Each has specific MAGI phase-outs, filing requirements, and interaction rules with existing retirement vehicles. The $5,000 annual contribution cap, $1,000 federal seed, and the pro-rata basis split on withdrawals are the mechanics that matter most for family planning.

IRS penalty relief: Form 843, abatement, and protective claims

The IRS offers three documented paths to penalty removal: First-Time Abatement (clean 3-year history, no questions asked), Reasonable Cause (documented circumstances beyond your control), and Protective Claims (preserving refund rights during pending litigation like Kwong v. United States). Form 843 is the single form that handles all three paths. Filing electronically through your IRS Online Account became available July 2026.

Frequently Asked Questions

Verified Financial TermsBuilt by Galvin Mendonca, Finance Researcher
All figures from primary government sources. Last updated July 2026.