The IRS Thinks Your Tax Return Might Be Identity Theft: What Letters 5071C, 4883C, and 5747C Mean
IRS Letters 5071C, 4883C, and 5747C freeze your refund until you verify your identity — online, by phone, or in person.
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Tax Filing
Tax filing procedures, deadlines, and best practices
IRS Letter 105-C: Your Refund Claim Was Disallowed — What the 30-Day Response Window and the Two-Year Suit Deadline Mean for You
IRS Letter 105-C fully disallows your refund claim — respond within 30 days and protect the two-year suit deadline, which Appeals never pauses.
Never Filed a Business Return? Why the IRS Has No Deadline to Audit You
No return means no time limit: the IRS can assess unfiled years anytime, then bill you through an SFR with zero deductions.
Tucson's New 10% Short-Term Rental Tax: A Host's Bookkeeping Checklist
Tucson taxes short-term rentals at 10% since March 1, 2026 — above the 9% hotel rate. Arizona hosts now owe 16.05% total with state and county layers.
Living on a Fellowship or Research Stipend? What the IRS Taxes, What It Doesn't, and How to Report It With No W-2
Fellowship stipends spent on living expenses are taxable under Section 117 — report them on Schedule 1, line 8r and pay quarterly estimates.
Your Tax Deadline Falls on a Weekend. Do You Owe Penalties on Monday?
IRS Section 7503 moves any tax deadline landing on a weekend or D.C. holiday to the next business day — but state dates and EFTPS cutoffs don't always follow.
Leaving the US? You May Need an IRS Sailing Permit Before You Board
Most non-citizens leaving the US need an IRS sailing permit: file Form 2063 or 1040-C in person 2 weeks to 30 days before you depart.
File Even If You Can't Pay: How IRS Late Penalties Stack to 47.5% of What You Owe
IRS failure-to-file costs 5% a month vs 0.5% for failure-to-pay under Section 6651, stacking to 47.5% — file on time, then request first-time abatement.
Selling U.S. Property as a Foreign Owner? How to Shrink the 15% FIRPTA Withholding and Get the Excess Back
Buyers must withhold 15% of your gross U.S. sale price under FIRPTA. File IRS Form 8288-B before closing to cut it, or claim the excess on Form 1040-NR.
The IRS Is Holding Your Refund — But Only for 3 Years
Unclaimed tax refunds become Treasury property 3 years after the return's due date — 2023 money expires April 15, 2027. File now.
IRS Letter 12C: Why Your Return Is On Hold and How to Respond in 20 Days
IRS Letter 12C is a processing hold, not an audit — fax or mail the requested forms within 20 days and skip Form 1040-X; refunds follow in 6–8 weeks.
Brunei's BND 1 Million Tax-Free Line: What the Corporate Tax Exemption Means for Your Books
Brunei companies with turnover up to BND 1 million owe no corporate income tax but must still file by June 30 — revenue cut-off decides which side you're on.