#irs-requirements
Meet IRS requirements for business tax compliance
Under Section 7502 a return mailed on or before its due date is deemed filed on the postmark date — but only if it actually arrives, and a postage-meter date never counts. Since December 24, 2025, USPS postmarks reflect regional processing rather than deposit, so certified mail or a free manual postmark is the proof that holds.
An IRS Letter 2800C orders you to withhold at a rate the agency sets, effective no sooner than 60 days out, and an employer who keeps withholding at the old rate is liable for the tax that should have been withheld. Here is the response checklist, the two narrow exceptions, and how to convert a pre-2020 allowance-based lock-in for modern payroll software.
If a payroll company withdraws your tax money and never deposits it, the employer still owes the full tax plus penalties. A payroll service provider or reporting agent assumes no liability, a Section 3504 agent shares it, and only an IRS-certified CPEO is solely liable for its work-site employees. This guide covers the Trust Fund Recovery Penalty that reaches owners personally, seven warning signs of a failing provider, and the monthly EFTPS verification habit that catches a missed deposit at a 2% penalty instead of 10%.
EPCRS gives small business 401(k) sponsors three ways to fix plan mistakes — self-correction with no fee, no filing, and no IRS contact through the third plan year for significant errors, a voluntary filing with IRS approval, or a negotiated closing agreement on audit — with standard fixes for late deferral deposits, missed eligible employees, plan loan failures, and missed RMDs.
The IRS's summer 2026 Business Tax Account update adds a digital notices library, self-service EIN verification letter (CP575) downloads, and online Offer in Compromise payments. Here's who qualifies, how setup works, and why disciplined bookkeeping makes these tools actually useful.
The IRS cut its Enrolled Agent exam fee from $99 to $66 per part in 2026, but new vendor PSI charges $251 versus Prometric's $168 — raising the total to $317 per part. The switch also brings a March–June testing blackout, a 200–800 scoring scale, and first-time remote proctoring for U.S. candidates.
Oral advice from the IRS is not binding — a private letter ruling is. Under Revenue Procedure 2026-1, 9100 relief for a missed tax election generally costs about $14,500, with reduced tiers near $3,450 and $9,775 for smaller organizations, and the IRS must make contact within 21 days of a complete request. Here's when a ruling is worth the fee, what the request must contain, and the no-fee alternatives — Form SS-8, Form 3115, and Rev. Proc. 2013-30 — that cover most common cases.
A safe harbor 401(k) automatically passes IRS ADP/ACP nondiscrimination testing in exchange for a fixed employer contribution — a 3% nonelective or a match of up to 4%. Here's how the three formulas compare in cost, the December 1 retroactive adoption deadline, and the 2026 limits ($24,500 deferral, $72,000 total additions, mandatory Roth catch-ups for high earners).
The "60/40 rule" for splitting S-corp salary and distributions has never appeared in any IRS regulation. What the IRS actually applies is a facts-and-circumstances test — the one that reclassified a CPA's $24,000 salary to $91,044 and cost him $23,000 in back payroll taxes. Here's how to set a defensible number.
Form 8275 lets taxpayers disclose debatable tax positions with the IRS to defeat the 20% Section 6662 accuracy-related penalty when a position has at least a reasonable basis. Covers when to use Form 8275 versus Form 8275-R, what counts as adequate disclosure, timing rules, and Section 6694 preparer-penalty protection.
With the second ERC Voluntary Disclosure Program closed since November 2024, small businesses with overstated Employee Retention Credit claims still have three remedies in 2026: claim withdrawal, self-amendment via Form 941-X, or responding to an IRS recapture letter. The IRS has a six-year audit window open through April 15, 2027 for Q3 and Q4 2021 claims, plus a 20% accuracy-related penalty for erroneous refunds.
Section 531 imposes a 20% accumulated earnings tax on C-corps that retain profits beyond a $250,000 credit ($150,000 for personal service firms) without specific, feasible plans. This guide explains the Bardahl working-capital formula, the Section 534 burden-of-proof statement, and the contemporaneous documentation that defends an accumulation in IRS audit.
