Form 1120 is the annual U.S. Corporation Income Tax Return every domestic C corporation must file, even in zero-income years. A 2026 walkthrough of deadlines, schedules C through M-2, estimated tax rules, and the eight most common filing mistakes.
A tax extension buys six months to file, not to pay. This guide explains exactly how to file Form 4868 (individuals) and Form 7004 (businesses), how to estimate a good-faith payment, and the state-level traps that cost filers real money.
A Substitute for Return is a 1040 the IRS files for non-filers using only third-party income data—no deductions, credits, or cost basis. This guide walks through the CP59, CP2566, and 90-day CP3219N sequence and the exact steps to replace an SFR with an accurate original return.
Calendar-year partnerships must file Form 1065 and issue Schedule K-1s by March 16, 2026. Late filing costs $255 per partner per month, up to 12 months. This guide covers every federal deadline, Form 7004 extensions, quarterly estimates, and the Rev. Proc. 84-35 safe harbor for small partnerships.
The 2026 standard deduction is $16,100 for single filers and $32,200 for joint filers, plus a new $6,000 senior bonus deduction for taxpayers 65+. Here is how to decide whether to take it or itemize.
Tax advisor pricing in 2026 ranges from about $150 for a simple Schedule C to $5,000+ for multi-state S-corp returns. This guide compares CPAs, enrolled agents, tax attorneys, and DIY software so you pay only for the tier you actually need.
How to check your IRS refund status in 2026, why refunds stall past the 21-day mark, and what the new direct-deposit freeze rules (CP53E notice) mean if your bank rejects the deposit.
Schedule A itemized deductions return in play for 2026 as the SALT cap rises from $10,000 to $40,400, charitable gifts face a new 0.5% AGI floor, and the $750,000 mortgage interest cap becomes permanent. This guide covers what qualifies, what changed under the OBBB, and how to decide whether itemizing beats the standard deduction.
Schedule C reports business income and expenses for sole proprietors and single-member LLCs. This guide walks through every line of the form, the $400 filing threshold, the home office and 70-cent-per-mile vehicle deductions, and the recordkeeping that holds up under IRS review.
Section 195 lets new businesses deduct up to $5,000 of startup costs and another $5,000 of organizational costs under Section 248/709 in the first year, with the remainder amortized over 180 months. Phase-out begins at $50,000 and eliminates the immediate deduction at $55,000.
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