21 guides in this topic. Browse all guides →
Got an IRS Notice? What Each Letter Means
CP2000, CP14, CP504 and penalty letters decoded — with the deadlines and the right responses.
IRS Penalty Abatement: How to Get Penalties Removed
First-time abatement, reasonable cause, and how $25,000 Form 5472 penalties get waived.
Unfiled Back Taxes: How to Catch Up Safely
The six-year rule, transcript pulls, SFR traps and the exact filing order.
IRS Payment Plans: Installment Agreements Explained
Short-term vs long-term plans, what they cost, and the mistakes that void them.
Business Tax Extensions: Form 7004 & 4868
Free, automatic, stigma-free — and the payment rule everyone forgets.
Amended Returns: When and How to Fix a Filed Return
1040-X, entity amendments, superseding returns and the 3-year refund window.
ITIN Application Guide: How to Get One From Anywhere
The W-7 process, certified passport copies, acceptance agents — and the mistakes that cause rejection.
Form 1040-NR: The Non-Resident's US Tax Return, Explained
ECI vs FDAP, treaty positions and when 'no tax owed' still means 'filing owed'.
Shopify Seller Taxes: The Complete US Guide
Shopify collects at checkout — registration, filing and remittance are yours. The full map.
Crypto Taxes for US Businesses and LLCs
Property rules, per-lot basis and the 1099-DA era — what business crypto really requires.
FBAR (FinCEN 114): Who Must File and What It Costs to Skip
The $10,000 foreign-account trigger, the deadline, and the penalties that make FBAR the most expensive form to forget.
W-8BEN vs W-9: Which Form Do You Actually Sign?
US person or not — that one question decides the form, and signing the wrong one can cost 30% in withholding.
Single-Member LLC Taxes, Explained in Plain English
Disregarded entity, Schedule C, self-employment tax, the S-corp option — and the flipped rules for foreign owners.
Hiring US Contractors: 1099-NEC Rules for Business Owners
W-9s up front, 1099-NEC by January 31, and the contractor-vs-employee test that catches growing teams.
Form 5472 Explained for Foreign-Owned LLCs
Form 5472 for foreign-owned US LLCs, who must file, the $25,000 penalty, what counts as a reportable transaction, and h
S-Corp vs LLC: Which Actually Saves More Tax?
S-corp vs LLC explained in plain English, how the S-corp election lowers self-employment tax, when it's worth it, and w
US Tax Filing Checklist for LLC Owners (2026)
A complete US tax filing checklist for LLC owners, forms, deadlines, deductions and the mistakes that trigger IRS notic
ITIN vs EIN vs SSN: What Each Is and Who Needs It
The three US tax IDs explained simply, what each is for, who needs which, and how non-residents get one without an SSN.
Estimated Quarterly Taxes: Dates, Penalties, How to Pay
Who owes quarterly estimated taxes, the 2026 due dates, how the underpayment penalty works, and the simplest way to pay on time.
Reasonable Salary for an S-Corp Owner (How the IRS Decides)
How to set a defensible reasonable salary as an S-corp owner, the factors the IRS weighs, and why getting it wrong is costly.
1099-K Threshold Changes: What Sellers Need to Know
What the changing 1099-K thresholds mean for online sellers, why a 1099-K is not new taxable income, and how to reconcile it.
Prefer it handled?
Everything in these guides is work we do daily — flat fees, CPA & EA reviewed.