A complete US tax compliance reference — what records to keep and for how long, the key federal deadlines, the cost of missing them, and the habits that keep you compliant.
Accounting · Topic
US Tax
Expert guides, analysis and tool comparisons on US Tax from the kurums.com Accounting desk — written for business decision-makers and updated as the market moves.
- 25 guides
- Updated Jun 20, 2026
Latest in US Tax
IRS Penalties & Interest: Failure to File, Pay & Relief (2025)
How IRS penalties and interest work — failure-to-file vs failure-to-pay, accuracy and fraud penalties, compounding interest, and first-time and reasonable-cause relief.
IRS Audits Explained: Types, Triggers & How to Respond (2025)
How IRS audits really work — the three types, how returns are selected, what raises audit risk, how to respond, your rights, and the appeals process.
US Sales Tax & Use Tax: Economic Nexus After Wayfair (2025)
How US sales tax and use tax work in 2025 — economic nexus after Wayfair, the $100,000 threshold, use tax, the five no-sales-tax states, and how businesses comply.
US State Income Tax: Rates, No-Tax States & Residency (2025)
How US state income tax works in 2025 — the nine no-tax states, flat vs progressive rates, residency rules, multi-state income, and the real cost of state tax.
US Business Tax Deductions: Home Office, Depreciation & More (2025)
The major US business tax deductions for 2025 — home office, vehicle, depreciation, Section 179, permanent 100% bonus depreciation, startup costs, and record-keeping.
All guides
US QBI Deduction (Section 199A): The 20% Pass-Through Break (2025)
How the US QBI deduction (Section 199A) works in 2025 — the 20% pass-through break, income thresholds, wage limits, service-business rules, and OBBB Act permanence.
S-Corp vs C-Corp: US Corporate Tax Compared (2025)
S-corp versus C-corp taxation — pass-through vs double taxation, the 21% corporate rate, the S-corp salary strategy, eligibility limits, and which corporate status to choose.
US LLC Taxation Explained: Default Rules & S-Corp Election (2025)
How US LLCs are taxed in 2025 — default pass-through treatment, S-corp and C-corp elections, self-employment tax, the QBI deduction, and when electing S-corp pays off.
US Business Structures & Taxes: LLC, S-Corp, C-Corp Explained (2025)
How US business structures are taxed — sole proprietorships, partnerships, LLCs, S-corps and C-corps, pass-through versus double taxation, and choosing the right entity.
US HSAs & Tax-Advantaged Accounts: The Triple Tax Benefit (2025)
How US HSAs and other tax-advantaged accounts cut tax — the HSA triple benefit, the HSA as a retirement account, 529 college plans, FSAs, and how to combine them.
US Roth IRA & Roth 401(k): Tax-Free Retirement Explained (2025)
How US Roth IRAs and Roth 401(k)s deliver tax-free retirement income — after-tax contributions, income limits, the backdoor Roth, no RMDs, and when Roth beats traditional.