Tax filing
Federal, state, VAT and local — what you owe, when it’s due, and how we file it for you.
10 guides
How to apply for an ITIN
An ITIN is a personal US tax number for people who can't get an SSN. Here's when a non-resident actually needs one, and how Form W-7 works.
How to file a UK self assessment return
Who must file, registering for a UTR, the 5 Oct, 31 Jan and payments-on-account deadlines, non-resident dividend income, and the £100 penalty.
How to file Form 1120 with Form 5472
A foreign-owned single-member LLC files a pro-forma Form 1120 as a cover page for Form 5472. Here's exactly what that means and how to do it.
What is double taxation, and how to avoid it
Double taxation means the same income gets taxed twice. Here's the corporate kind, the cross-border kind, and how founders actually avoid each.
US LLC taxes for non-residents, explained
A foreign-owned US LLC doesn't automatically owe US tax — it turns on whether you have effectively connected income. Here's the real mechanism.
UK VAT registration for non-resident companies
Own a UK Ltd from abroad? You might owe VAT from your very first UK sale, with no turnover threshold. Here's when you register and how returns work.
Form 5472 — what foreign-owned US LLCs must file
If a non-US person owns a US LLC, the IRS wants Form 5472 and a pro-forma 1120 every year. Miss it and the penalty starts at $25,000. Here's the plain version.
Form 1040-NR: when LLC owners must file
Form 1040-NR is your personal US return as a non-resident. Here's exactly when an LLC owner must file one, and how it differs from Form 5472.
Sales tax and nexus for foreign-owned US LLCs
US sales tax is state-level and triggered by "nexus" — even with no US presence. How economic nexus, thresholds, and marketplace rules hit foreign founders.
ITIN vs EIN vs SSN: which one do you need?
Three US tax numbers, three different jobs. Here's what an SSN, ITIN, and EIN each do — and which ones a non-resident founder actually needs.
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