ServicesUS & International

US Bookkeeping. Done right.

US-ready books, EIN and fractional CFO support for UK founders crossing the Atlantic.

Expanding to the US is exciting until the admin lands: a new entity, an EIN you can't get online without an SSN, a US tax year that runs to a different rhythm than your UK one, and investors who expect clean, GAAP-style books from day one. Zmartly handles the financial side end to end. Your ACCA-qualified, named accountant sets up bookkeeping that satisfies both your UK records and your US filings, keeps the two entities cleanly separated, and gives you fractional CFO support when you need a number for a board pack or a fundraise. Replies land within 72 hours, pricing is fixed (£99, £199 or £499 a month), billing is rolling monthly, and there's a 30-day money-back guarantee. You stay focused on selling into the US market; we keep the books, the deadlines and the structure straight.

  • 4.9 Google · 63 reviews
  • ACCA-qualified
  • 30-day money-back
Book your callSee pricing
Manhattan skyline at dusk
Our expertise covers

Everything in this service, in one bill.

  • 01

    Delaware or Wyoming incorporation

    We help you choose the right US entity before you file, not after. If you intend to raise US venture capital, a Delaware C-Corp is almost always the answer: investors know the case law and most funds cannot hold an LLC, so starting elsewhere means paying to convert later. If you're running a bootstrapped or e-commerce operation with no near-term equity round, a Wyoming LLC is cheaper to form and run and keeps founder details off the public record. We talk you through the trade-offs for your specific plan and coordinate the formation.

  • 02

    EIN registration without a US SSN

    Every US entity needs an Employer Identification Number to open a bank account, run payroll or file tax. As a UK founder with no US Social Security Number, you can't use the IRS online tool. We prepare Form SS-4 correctly, including the responsible-party line where founders most often trip up, and submit it by fax or phone to the IRS international line. We manage the back-and-forth so you get your EIN with the least friction.

  • 03

    US bookkeeping done to US standards

    We keep your US entity's books in QuickBooks Online (or your preferred ledger), reconciled monthly, with revenue, expenses and intercompany transactions cleanly recorded. We connect your US bank feed and payroll tools, categorise to a chart of accounts that maps to US reporting, and keep the US entity ring-fenced from your UK company so neither set of accounts contaminates the other.

  • 04

    UK and US entity coordination

    Most of our clients run a UK company and a US subsidiary or sister entity at the same time. We keep both ledgers aligned, document intercompany charges (such as a UK parent invoicing the US entity for services), and make sure transfer-pricing-sensitive transactions are recorded with a clear rationale. One named accountant sees both sides, so nothing falls between the two countries' books.

  • 05

    Fractional CFO support

    When you need more than bookkeeping, your accountant steps up to fractional CFO work: cash-flow forecasting across both entities, board-pack financials, budget-versus-actual reporting, and clean numbers for due diligence ahead of a US raise. You get senior financial judgement on a fixed monthly fee instead of hiring a full-time finance lead before you can justify one.

  • 06

    US tax filing readiness

    We keep your books in the state US accountants expect, so year-end filing is straightforward rather than a scramble. We track filing obligations such as the annual report and franchise tax that apply to Delaware and Wyoming entities, flag deadlines early, and hand a tidy, reconciled trial balance to your US tax preparer. We coordinate with US-licensed tax advisers on returns themselves rather than overstating what a UK practice can sign off.

Why it pays off

What you actually get.

  • One named accountant, both countries

    You deal with the same ACCA-qualified accountant for your UK and US books, not a rotating support queue. They understand how the two entities interact, so you're never re-explaining your structure.

  • Fixed monthly pricing

    Plans are £99, £199 or £499 a month with no surprise add-ons. You know the cost before you commit, which matters when you're already absorbing US formation and registered-agent fees.

  • Rolling monthly, cancel anytime

    No annual lock-in. Billing is rolling monthly and backed by a 30-day money-back guarantee, so you can scale support up as the US entity grows and down if plans change.

  • Investor-ready from day one

    Books kept to a standard US investors and acquirers recognise mean diligence doesn't derail your raise. When a term sheet appears, your numbers are already clean.

  • 72-hour replies you can plan around

    Every query gets a response within 72 hours. Across a five-hour time difference, that predictability keeps US deadlines and board dates from slipping.

How we deliver

Four steps from first call to filed.

  • 01

    Discovery

    Understanding your business needs.

  • 02

    Solution Design

    Crafting your custom accounting strategy.

  • 03

    Onboarding

    Quick and easy integration.

  • 04

    Regular Rhythm

    Consistent monitoring and reporting.

See the full process
Further reading

Related guides.

Related services

More from US & International.

Trusted by leading innovators
Partner brand 1
Partner brand 2
Partner brand 3
Partner brand 4
Partner brand 5
Partner brand 6
Partner brand 7
Partner brand 8
Partner brand 9
Partner brand 10
Partner brand 11
Partner brand 12
Common questions

Frequently asked questions.

QuickBooks Online is our primary platform - we integrate via secure API for bank feeds, invoicing, and reporting - and it suits 90% of US small businesses. For clients on Xero, Wave, FreshBooks, or NetSuite we can either run the books in-platform or migrate the file to QBO at no charge during onboarding.

Monthly review against Schedule C categories (sole prop), 1120-S (S-Corp), or 1120 (C-Corp) so legitimate deductions - home office, mileage, professional services, software, depreciation, Section 179 - are categorised correctly the first time. Most new clients show 8-15% in previously missed deductions in the first quarter of cleanup.

Bank and credit card feeds direct into QBO, payroll sync with Gusto or ADP, expense cards from Ramp or Brex, payment processors (Stripe, Square, PayPal), and e-commerce platforms (Shopify, Amazon Seller). Each integration eliminates manual entry - the goal is for nothing to be typed twice.

Yes - we track economic nexus thresholds in every state where you have sales, register for state sales tax permits when thresholds are crossed, and file the periodic returns. For volume sellers we integrate with TaxJar or Avalara so calculation, collection, and remittance happen automatically across all states.

Every transaction is backed by a digital document (receipt, invoice, contract) stored in QBO; monthly reconciliations are signed off and locked; year-end review packs document the treatment of any non-routine items. If the IRS sends a notice, we respond on your behalf and have the supporting documentation already organised.

Got a different question?
Zmartly Ltd20-22 Wenlock Road, London N1 7GU020 8175 5145info@zmartly.co.uk
Free · 30 minutes · No obligation

Stop overpaying tax. Start filing in 5 days.

Thirty minutes with an ACCA-qualified accountant. Most owners uncover £1,000-£3,000 in annual savings on the first call. If we are not the right fit, you walk away with a free tax review on the house.

Book my Tax Health CheckCall 020 8175 5145
Google reviewer HeenaGoogle reviewer land4 success (chill feel good)Google reviewer Jorge Carballo GomezGoogle reviewer Auris Property AcademyGoogle reviewer Sean Barrington
Joined by 240+ UK businesses this year
4.9 Google< 72h reply time30-day money-back