David W. Klasing Tax Law Blog

David W. Klasing Tax Law Blog

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Law firm analysis of individual, business, and international tax planning, controversies, and compliance.

What W-2 Withholding Anomalies Trigger an IRS Review?
NewsMay 8, 2026

What W-2 Withholding Anomalies Trigger an IRS Review?

Form W‑2 reporting drives the IRS’s post‑filing verification, matching employer‑reported wages and withholding against individual returns. Mismatches trigger CP2000 notices for taxpayers and CAWR discrepancy cases for employers, often escalating to deeper audits. Errors such as missing, incorrect, or late‑filed...

By David W. Klasing Tax Law Blog
Charitable Contribution Audits and Substantiation Pitfalls
NewsMay 7, 2026

Charitable Contribution Audits and Substantiation Pitfalls

Taxpayers risk losing charitable deductions when they fail to meet IRS substantiation requirements. Cash gifts over $250 need a contemporaneous written acknowledgment, while non‑cash contributions above $500 must be reported on Form 8283 and often require a qualified appraisal if valued...

By David W. Klasing Tax Law Blog
Instructions for S Corporation Election Timing- File Form 2553 Correctly
NewsMay 5, 2026

Instructions for S Corporation Election Timing- File Form 2553 Correctly

A timely Form 2553 election is essential for businesses seeking S corporation status and the associated pass‑through tax benefits. The IRS requires filing within 2 months and 15 days of the intended effective date, with proper signatures and shareholder consent;...

By David W. Klasing Tax Law Blog
Marketplace Facilitator Rules and CDTFA Audits
NewsApr 29, 2026

Marketplace Facilitator Rules and CDTFA Audits

California treats registered marketplace facilitators as the retailer for sales tax, but sellers must still prove each transaction’s facilitator status in a CDTFA audit. The audit focus shifts from the existence of the rule to whether sellers can separate marketplace...

By David W. Klasing Tax Law Blog
IRS Form 4180 Responsible Party Interview Preparation
NewsApr 24, 2026

IRS Form 4180 Responsible Party Interview Preparation

IRS Form 4180 is the interview record the Revenue Officer uses to decide who is responsible for payroll tax deposits and whether that person acted willfully, forming the basis of the Trust Fund Recovery Penalty (TFRP). The penalty equals the...

By David W. Klasing Tax Law Blog
IRS Form 4564 Information Document Requests
NewsApr 23, 2026

IRS Form 4564 Information Document Requests

Form 4564, the IRS’s Information Document Request (IDR), signals a critical audit juncture where taxpayers must supply only authentic, existing records. The IRS now demands narrowly scoped, issue‑specific requests, and any vague or overbroad demand should be challenged early. Supplying...

By David W. Klasing Tax Law Blog
ERC Audits and Documentation Failures That Create Civil Tax Fraud Exposure
NewsApr 2, 2026

ERC Audits and Documentation Failures That Create Civil Tax Fraud Exposure

The Employee Retention Credit (ERC) is now a top IRS audit target, with the agency cross‑checking eligibility against government orders, payroll data, and revenue declines. Aggressive marketing that promises quick refunds often skips required documentation, exposing firms to fraud investigations....

By David W. Klasing Tax Law Blog
Civil Fraud Penalty Risk and the Badges-of-Fraud Patterns Used by IRS Examiners
NewsApr 1, 2026

Civil Fraud Penalty Risk and the Badges-of-Fraud Patterns Used by IRS Examiners

The IRS’s civil fraud penalty, codified at IRC §6663, imposes a 75% surcharge on any underpayment proven to stem from intentional tax evasion. Examiners rely on “badges of fraud” – patterns such as unexplained income spikes, missing records, and contradictory statements...

By David W. Klasing Tax Law Blog
NFT Transactions, Valuation, and Basis Documentation Issues
NewsMar 31, 2026

NFT Transactions, Valuation, and Basis Documentation Issues

The IRS treats NFTs as taxable property, meaning every sale, exchange, or receipt for services triggers a gain or loss measured at fair‑market value. New broker‑reporting rules require Form 1099‑DA to disclose gross proceeds beginning in 2025, with basis reporting delayed...

By David W. Klasing Tax Law Blog
Basis Substantiation Audits for Partnerships and S Corporations
NewsMar 24, 2026

Basis Substantiation Audits for Partnerships and S Corporations

Basis substantiation audits focus on a taxpayer’s outside basis in partnerships and stock or debt basis in S corporations. The IRS examines how partners compute outside basis, especially liability allocations, while S‑corp shareholders must complete Form 7203 to prove loan documentation...

By David W. Klasing Tax Law Blog