How Much Does a Cross Border Tax Accountant Cost in 2026?

How much does a cross border tax accountant cost? There is no single market price, because the fee follows the work and not your income. What a US/UK accountant charges depends on how many returns, information forms, investment funds, US states, companies and catch-up years your situation involves, and whether the fee is fixed or hourly. No regulator or professional body publishes a survey of US/UK tax fees, so this guide does not print one. It explains what makes the fee small or large, so you can test the quote you are given.

If you want numbers to anchor on, our pillar guide to accountants for US and UK taxes has a table of illustrative ranges by scenario, clearly labelled as our own illustration.

How much does a cross border tax accountant cost, and why is there no standard price?

A cross border tax accountant's fee is the price of a list of documents. Two people on the same salary can receive quotes several times apart because one of them needs three documents filed and the other needs fifteen. A firm that quotes without asking what you hold is either pricing a different job or planning to revise the figure later.

Our guide to what tax preparation services for the US and UK include sets out which of these normally sit inside a standard fee and which are priced as extras. Here the question is narrower: what does each item add to the work, whether that is another return, another information form or another year?

What you have, and what it adds to the work

Count your own drivers before you ask for a quote. The table lists work, not prices.

What you have	What it adds to the work	Scales with
UK salary and ordinary bank accounts	Form 1040 with a foreign tax credit (Form 1116) or the earned income exclusion (Form 2555), plus an FBAR	Number of accounts
Foreign assets above the Form 8938 thresholds	Form 8938 attached to the return, listing accounts, pensions and other specified assets	Number of assets
UK funds, in an ISA or outside one	A separate Form 8621 for each fund that is a PFIC	Number of funds, and whether there were sales or distributions
Income HMRC does not collect through PAYE	A Self Assessment return with supplementary pages: SA106 for foreign income, SA105 for property, SA108 for gains, SA109 for residence	Number of pages and sources
A rental property in either country	Rental accounts under two sets of rules, US depreciation, currency conversion	Number of properties
Ties to a US state, or a part-year move	A resident, part-year or non-resident state return	Number of states
A UK limited company you own or control	Form 5471 with its schedules, drawn from the company's accounts	Number of companies
Years not filed	Three years of returns, six years of FBARs and a signed certification under the Streamlined procedures	Number of years and forms per year
An error on a return already filed	An amended US return on Form 1040-X, or an amended UK return	Number of years
A letter from the IRS or HMRC	Reading, replying and following up, often outside the annual fee	Time, which nobody can fix in advance

The fee drivers, one by one

FBAR and Form 8938

The FBAR is required when the combined value of your non-US financial accounts exceeds $10,000 at any time in the calendar year. Form 8938 has higher thresholds: for an unmarried taxpayer living abroad, more than $200,000 on the last day of the tax year or more than $300,000 at any time, and $400,000 and $600,000 for a couple filing jointly, according to the IRS comparison of Form 8938 and FBAR requirements (page reviewed September 2026). Each report needs the highest balance of every account in US dollars, so the work scales with the number of accounts. See our foreign income and FBAR service for what is reported where.

PFICs and Form 8621

This is the driver that surprises people most. The IRS instructions for Form 8621 (revised December 2025) state that a separate Form 8621 must be filed for each PFIC in which stock is held directly or indirectly. UK unit trusts, OEICs and most UK-listed funds are commonly PFICs for a US person, including when they sit inside an ISA. Ten funds can mean ten forms, each with its own cost history, distributions and election. Our PFIC reporting service page explains the regimes, and ISAs and the PFIC problem covers the ISA case.

US state returns

A federal return does not settle your state position. If you moved from a US state during the year, kept a home or rental there, or the state still regards you as domiciled, a state return may be due. Each state has its own form and its own treatment of foreign income, so each one is a separate piece of work.

UK supplementary pages

On the UK side the main SA100 return is short. The work is in the supplementary pages. A US brokerage account means SA106 foreign pages with dividends, interest and foreign tax converted to sterling. A let property means SA105, a sale of shares or property means SA108, and an arrival or departure year means SA109. Each page adds calculations that must then agree with the US return. Our UK Self Assessment service lists the pages we see most often.

Companies and Form 5471

Owning a UK limited company moves a US person into a different category of work. The Form 5471 instructions (revised December 2025) set out several categories of filer and a schedule-by-schedule chart of what each must complete, and state a $10,000 penalty for each annual accounting period of each foreign corporation where the required information is not furnished on time. The form needs the company's accounts restated into the layout the IRS asks for, which is why it is priced as a project of its own.

Streamlined catch-up years

Under the IRS Streamlined Foreign Offshore Procedures, a non-wilful filer living outside the US files delinquent or amended returns for the most recent three years, FBARs for the most recent six years and a certification on Form 14653. Every driver above is multiplied by the years involved: three years of funds means three years of Forms 8621. Our IRS Streamlined service page describes the package.

Amendments and correspondence

The Form 1040-X instructions require a separate Form 1040-X for each year being amended, so correcting three years is three jobs. Letters from the IRS or HMRC are the least predictable item of all. Some firms include a reply to a routine notice about a return they prepared; most price anything longer by the hour, so ask before you sign.

Fixed fee or hourly rate: which should you accept?

For annual compliance, accept a fixed fee in writing. The returns, forms, accounts, funds and years can all be counted before work starts, so the firm is able to price them and should carry the risk if the work takes longer than expected. Hourly billing on routine compliance moves that risk to you.

Hourly or separately scoped fees are reasonable where the amount of work cannot be known: an HMRC enquiry, an IRS examination, a disputed residence position, or planning before a move or a sale. Even then, ask for an estimate or a cap, and to be told before it is exceeded.

One fee basis is a warning sign in its own right. The IRS, in Topic no. 254, tells taxpayers to avoid return preparers who base their fees on a percentage of the refund. The same page says a paid preparer must have a Preparer Tax Identification Number, enter it on the return and sign it.

What should a written quote itemise?

A quote you can rely on reads like a scope, not a price. Before you compare two firms, check that each quote states the following. Our guide on how to compare US/UK cross border tax services providers explains how to send every firm the same brief.

1. The returns, by name and tax year. Form 1040 for the calendar year, Self Assessment for the UK tax year, and any state return.
2. The forms included, by number. Form 1116 or 2555, the FBAR, Form 8938, Form 8833 and the UK supplementary pages.
3. The unit price of anything that scales. The fee for each Form 8621, each additional state, each extra property or each additional year.
4. What is excluded. Amendments, prior years, company filings and planning advice, stated plainly.
5. Correspondence. Whether replying to an IRS or HMRC letter about the return is included, and the basis of charge if not.
6. VAT. Whether the figure is before or after VAT, and whether VAT applies to you at all.
7. What triggers a revised fee. And that you will be told before the extra work is done, not after.
8. Who prepares and signs each return, and when payment is due.

Is VAT added to a cross border tax accountant's fee?

It depends on where you live and where the firm is established. For services to a private individual, HMRC's VAT Notice 741A starts from a general rule that the place of supply is where the supplier belongs. A VAT-registered UK firm acting for a private client who lives in the UK therefore adds VAT at the standard rate, which GOV.UK lists as 20%.

Section 12 of the same notice makes an exception that matters for cross border clients. Certain services supplied to a private customer who belongs outside the UK, expressly including the services of accountants and consultants, are treated as supplied where the customer belongs and so are outside the scope of UK VAT. An individual belongs where they have their usual place of residence. A British citizen living in Texas who uses a UK firm for a UK return is therefore normally not charged UK VAT, while an American living in London is.

Can you deduct the fee from your tax in either country?

For a personal return, no, in both countries. The part that relates to a business or a rental property is treated differently.

United States. IRS Publication 529 states that tax preparation fees are a miscellaneous itemised deduction and can no longer be deducted. The suspension that began in 2018 was due to end after 2025; Congress removed that end date in Public Law 119-21, and the 2025 Schedule A instructions do not list preparation fees among the other itemised deductions still allowed. The business share survives: the 2025 Schedule C instructions (line 17) include fees for tax advice and for preparing tax forms related to your business, and the 2025 Schedule E instructions (line 10) include the same for rental real estate.

United Kingdom. HMRC's Business Income Manual at BIM46450 accepts normal recurring accountancy costs of preparing business accounts and agreeing the tax on them, but says the costs of completing a tax return or computing a Capital Gains Tax liability are not allowable. The Property Income Manual at PIM2120 takes the same line for landlords. GOV.UK's guidance for the self-employed says plainly that you cannot claim the cost of preparing and submitting your Self Assessment return.

The practical step is simple. If you have a trade or a let property, ask for the invoice to show the accounts work separately from the personal return, so the allowable part can be claimed on the right schedule in each country.

How to reduce the fee without cutting corners

You lower the fee by lowering the work, not by negotiating the rate.

• Send organised documents once. A single complete batch, with the year-end and highest balance for every account, costs less to process than six emails over three months.
• Consolidate funds. Because Form 8621 is per fund, holding three funds instead of twelve reduces the work every year. Selling a fund has tax consequences of its own, so take advice before you tidy up.
• Disclose events before the quote. A property sale, share vesting, an inheritance or a move changes the scope. Raised at the start it is priced; raised late it becomes an extra.
• Get the timing right. Records sent months ahead are prepared under less pressure than records sent in the weeks before a deadline, and late filing adds penalties and interest that no accountant can remove.
• Use one team for both returns. The same income, converted and analysed once, feeds both returns. Two unconnected firms each do that work and then charge to reconcile it.
• Catch up before a letter arrives. Eligibility for the Streamlined procedures depends on coming forward first. Our guide on when to hire cross border tax specialists for US and UK work explains the triggers.

Illustrative example: two Americans in Manchester earn the same UK salary. The first has two bank accounts and a workplace pension, and her UK tax is settled through PAYE. Her year is a Form 1040 with Form 1116 and one FBAR: three pieces of work. The second also holds a stocks and shares ISA with six UK funds, lets a flat in Leeds and moved from California in March. Her year is the same three pieces plus six Forms 8621, Form 8938, a Schedule E, a part-year California return and a Self Assessment return with SA105 and SA106 pages: fourteen pieces, several of which must agree with each other. Same income, very different fee. This is illustrative only and is not a quote.

What people get wrong about cross border tax fees

• Assuming the fee tracks income. A high earner on PAYE with no investments is a simpler client than a modest earner with an ISA full of funds.
• Comparing totals instead of scopes. The lowest quote is often the one that leaves out the FBAR, the state return or the UK side.
• Treating the UK return as optional. If the UK figures are not prepared properly, the US foreign tax credit rests on estimates and the cost returns later as an amendment.
• Forgetting VAT. Compare the amounts you will actually pay, with VAT included where it applies.
• Expecting the first year to be typical. Year one includes collecting history: cost bases, pension contribution records, prior elections. Later years on the same facts are usually less work.

Getting a figure for your own situation

The honest answer to the cost question is a quote built on your facts. List your accounts, funds, pensions, property, any company, your last US state and the years already filed, then ask for a fixed fee against that list. Our guide to tax specialists for US and UK covers the credentials to check while you do it.

US/UK Cross Border Tax — US CPAs and UK tax advisers working as one team; London, Manchester, New York, San Francisco. We quote a fixed fee in writing against a named scope before any work starts, through our cross border tax service. Send us your list and ask how much a cross border tax accountant would cost for your own situation.