Business bookkeeping services that keep your US and UK books straight

One named, qualified accountant for both your US entity and your UK company, on a fixed monthly fee.

Expanding into the United States is exciting until the admin lands. You have a new US entity, an Employer Identification Number (EIN, your US federal tax ID) you cannot get online without a US Social Security Number, a tax year that runs to a different rhythm than your UK one, and investors who expect clean books from day one. Our bookkeeping services take the financial side off your desk. One named, qualified accountant keeps your US books to the standard American investors expect, keeps them cleanly separate from your UK records, and gives you a straight answer within 72 hours. Pricing is fixed at £129, £250 or £499 a month, billing is rolling monthly, and there is a 30-day money-back guarantee.

  • 4.9 Google · 63 reviews
  • CIMA-regulated
  • 30-day money-back
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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.

What do our outsourced bookkeeping services cover each month?

When you hand your books to us, you are buying a finished monthly result, not another login to check. Our bookkeeping services cover the full monthly cycle for your US entity. We connect your US bank and card feeds, reconcile every transaction, categorise income and expenses to a US chart of accounts, and record any transactions between your UK and US companies. The result should feel like less admin, not another job on your list, so you get a clean set of numbers each month without chasing anyone.

Bookkeeping data entry services

The unglamorous part, entering and coding every invoice, receipt and bank line, is done for you and checked by a person. We connect feeds so nothing is typed twice, then review the coding so your reports are right the first time, not corrected three months later.

Bookkeeping management services

Beyond the raw data, we run the whole file: month-end close, reconciliations signed off and locked, and a documented treatment for anything out of the ordinary. You always know the books are current, so a board request or a lender question never catches you three months behind.

How do small business bookkeeping services work with a US entity?

Most of the founders we help run a UK company and a US subsidiary at the same time. We keep both ledgers aligned, so a US number is a US number and your UK accounts are not muddled by dollar transactions. Your US entity stays ring-fenced, with intercompany charges documented, such as a UK parent invoicing the US company for services, and transfer-pricing-sensitive items recorded with a clear reason. One accountant sees both sides, so nothing falls between the two countries' books, whether you run the US arm beside an established UK company or a brand new one.

Can you combine bookkeeping and accounting services across both countries?

Yes. Bookkeeping and accounting services work best when the same team does both, because the person who codes the transactions is the person who prepares the reports. We keep the books monthly and produce management accounts from them, so you are not handing a messy file to a separate accountant at year end. For UK taxes such as Value Added Tax (VAT) and Corporation Tax we work from the same records. For the US return we hand a tidy, reconciled trial balance to a US-licensed preparer rather than overstating what a UK practice can sign.

Fractional bookkeeping services

When you need more than a monthly close, your accountant steps up to senior finance work on the same fixed fee: cash-flow forecasting across both entities, board-pack numbers, and figures a US investor can rely on during due diligence. You get that judgement without hiring a full-time finance lead before you can justify one.

Do you offer payroll and bookkeeping services together?

If you have staff, payroll and the books should sit in one place. We run your US payroll through the tools you already use, such as Gusto or ADP, and feed it straight into the books so wages, taxes and pension amounts land in the right accounts automatically. For your UK team we handle PAYE (Pay As You Earn, the way HM Revenue and Customs, HMRC, collects Income Tax and National Insurance from wages) through your UK payroll. Either way, one accountant keeps the payroll and the ledger in step, so nothing is entered twice and nothing is missed.

How do virtual bookkeeping services for small business keep my data safe?

Working with a UK firm on your US books does not make your data less safe. Handling the books remotely is now normal, not novel, and the questions that matter are simple: who holds your data, do you own it, and how fast does a human reply. With us, your books live in your own accounting software, usually QuickBooks Online, under your account. We work inside it with permissioned access, not by emailing spreadsheets, and you can revoke that access in one click. A named person replies within 72 hours.

Working with a bookkeeping services company

You are not handing your finances to a faceless platform that could switch off and lock you out. Your records stay in your own software, so if you ever leave, you keep everything. There is no exit fee and no data held hostage. A clear way out is part of what you pay for, not a line you find later.

What monthly reports will you actually receive?

Bookkeeping is only worth paying for if it tells you something. Every month your accountant sends a plain set of management accounts for your US entity: a profit and loss account (the income statement), a balance sheet, and your cash position, all reconciled to the bank and presented to the GAAP standard (Generally Accepted Accounting Principles, the US reporting standard) that investors and lenders expect. These are the same monthly management accounts we produce for UK companies, prepared to US rules. You see how the US side is performing on its own, not buried inside your UK figures. When your board asks how the US entity is doing, the answer is ready rather than a spreadsheet you have to explain.

What about bookkeeping and tax services at year end?

Clean books make tax season boring, which is the goal. Our bookkeeping and tax services keep your US entity filing-ready all year. We track obligations such as the annual report and franchise tax that apply to Delaware and Wyoming companies, flag deadlines early, prepare your 1099 contractor information, and keep an eye on US sales tax nexus as you sell into more states. For the US income tax return itself we coordinate with a US-licensed preparer, a Certified Public Accountant (CPA) or an Enrolled Agent, so clean numbers go straight to them. That handover is usually where the real cost and stress of a US tax season comes from.

Your bookkeeping services agreement, in plain English

Everything is set out before you start: what we do each month, what it costs, and how either side can end it. No annual lock-in and no surprise add-ons. You know exactly what you are getting and what you are paying for.

Why it pays off

What you actually get.

  • One named accountant, both countries

    You deal with the same 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 £129, £250 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 much do our bookkeeping services cost?

Our bookkeeping services are priced simply: fixed and rolling monthly, with no setup fee and a 30-day money-back guarantee, so you know the cost before you absorb US formation and registered-agent fees on top. The three plans build on each other, and we confirm the right one with you on a short call before you commit.

Essentials, £129 a month

Core bookkeeping for your US entity, reconciled monthly management accounts, records kept filing-ready for year end, and a dedicated qualified accountant. Suits an early US entity with straightforward activity.

Premium Plus, £250 a month

Everything in Essentials, plus payroll handling and fuller reporting across both your UK and US entities. Suits a trading US entity with staff on the books.

Enterprise, £499 a month

Everything in Premium Plus, plus senior finance support: cash-flow forecasting across both entities, board-pack financials, and diligence-ready numbers for a US raise.

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.

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Common questions

Frequently asked questions.

QuickBooks Online is our main platform. We connect to it by secure link for bank feeds, invoicing and reporting, and it suits most US small businesses. If you are on Xero, Wave, FreshBooks or NetSuite, we can either run the books in that software or move the file to QuickBooks Online at no charge during onboarding.

Each month we review your costs against the right US categories for your entity, whether that is a sole proprietor, an S-Corp or a C-Corp, so legitimate deductions such as home office, mileage, professional fees, software and equipment are coded correctly the first time. Doing this monthly, rather than in a year-end rush, is what stops deductions slipping through.

Bank and card feeds into QuickBooks Online, payroll from Gusto or ADP, expense cards from Ramp or Brex, payment processors such as Stripe, Square and PayPal, and ecommerce platforms such as Shopify and Amazon. Each connection removes manual entry, so nothing is typed twice.

Yes. We track economic nexus (the point at which your sales into a state create a tax duty there) in each state where you sell, register for a sales tax permit when a threshold is crossed, and file the periodic returns. For higher-volume sellers we connect a tool such as TaxJar or Avalara so calculation, collection and remittance run automatically.

Yes, and most founders who come to us are behind rather than ahead. In the rush to launch a US entity, months of transactions often go unreconciled. We take the backlog on as the first job: reconcile it against your US bank and card feeds, agree the treatment of anything unusual, and get you to a clean, current position before the monthly cycle starts. Catch-up work is quoted separately once we have seen the scope, so you are never surprised by the bill.

We can take over from an existing US bookkeeper or a UK accountant without disruption. We take read access to your QuickBooks Online file and bank feeds, review what is already there, and pick up your bookkeeping services from the next monthly close. Onboarding usually takes a couple of weeks, and your named accountant stays the same point of contact throughout, so you are not re-explaining your structure to a new face every time.

Word of mouth

What clients actually say.

  1. I’ve had an excellent experience working with Zmartly. Harvey and the team are professional, responsive, and genuinely supportive. They explain things clearly, stay on top of deadlines, and always look for practical ways to save tax and improve…
    Google reviewer land4 success (chill feel good)
    land4 success (chill feel good)Verified Google review · 6 months ago
  2. I’ve used several accountants in the past, but hands down there is no one better than Harvey at Zmartly. He really understands exactly what advice you’re looking for and explains everything clearly and professionally. Nothing ever feels rushed…
    Google reviewer Heena
    HeenaVerified Google review · 4 months ago
  3. I started working with Zmartly Accountants after having serious issues with my previous accounting firm. They were missing deadlines, incorrectly calculating VAT, constantly late, and extremely difficult and frustrating to communicate with. Switching to Zmartly was a huge…
    Google reviewer Jorge Carballo Gomez
    Jorge Carballo GomezVerified Google review · 5 months ago
  4. I've had a terrible experience with multiple accountants. Zmartly have been incredible. If you do ecommerce / Amazon FBA you definitely need to go with someone who understands the complexities with it. Thanks to Harvey and his amazing…
    Google reviewer Sean Barrington
    Sean BarringtonVerified Google review · 6 months ago
  5. Its not easy to find accountants who understand ecommerce especially Amazon and these guys know Amazon very well. Always helps us with advice if they spot something we incorrectly. Super easy to speak with someone if you have…
    Google reviewer Darius Jaselskis
    Darius JaselskisVerified Google review · 6 months ago
  6. I’ve had an excellent experience working with Zmartly. Harvey and the team are professional, responsive, and genuinely supportive. They explain things clearly, stay on top of deadlines, and always look for practical ways to save tax and improve…
    Google reviewer land4 success (chill feel good)
    land4 success (chill feel good)Verified Google review · 6 months ago
  7. I’ve used several accountants in the past, but hands down there is no one better than Harvey at Zmartly. He really understands exactly what advice you’re looking for and explains everything clearly and professionally. Nothing ever feels rushed…
    Google reviewer Heena
    HeenaVerified Google review · 4 months ago
  8. I started working with Zmartly Accountants after having serious issues with my previous accounting firm. They were missing deadlines, incorrectly calculating VAT, constantly late, and extremely difficult and frustrating to communicate with. Switching to Zmartly was a huge…
    Google reviewer Jorge Carballo Gomez
    Jorge Carballo GomezVerified Google review · 5 months ago
  9. I've had a terrible experience with multiple accountants. Zmartly have been incredible. If you do ecommerce / Amazon FBA you definitely need to go with someone who understands the complexities with it. Thanks to Harvey and his amazing…
    Google reviewer Sean Barrington
    Sean BarringtonVerified Google review · 6 months ago
  10. Its not easy to find accountants who understand ecommerce especially Amazon and these guys know Amazon very well. Always helps us with advice if they spot something we incorrectly. Super easy to speak with someone if you have…
    Google reviewer Darius Jaselskis
    Darius JaselskisVerified Google review · 6 months ago
4.9
Google · based on 63 reviews
Zmartly Ltd12 Hammersmith Grove, London W6 7AP020 8175 5145[email protected]
Free · 30 minutes · No obligation

Stop overpaying tax. Start filing in 5 days.

Thirty minutes with a 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.

Google reviewer land4 success (chill feel good)Google reviewer HeenaGoogle reviewer Jorge Carballo GomezGoogle reviewer Sean BarringtonGoogle reviewer Darius Jaselskis
Joined by 240+ UK businesses this year
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