Moving your own money is not income. Everything around it might be.

It is a movement of money you already own. Tax attaches to income, gains and gifts, not to the act of moving your own funds. So a transfer between accounts in your own name changes nothing about what you owe.

Not by itself. Neither country taxes the movement of money you already owned and have already reported. The savings you built from taxed salary stay taxed salary after they cross the Atlantic.

What changes is visibility. Banks ask questions, balances shift between accounts, and forms that depend on balances start to bite.

Consequently the planning is about reporting rather than about tax. Those are different problems with different deadlines.

When it comes from a non-US person and the amounts get large. The instructions to Form 3520 require a US person to report receipts of more than $100,000 from a nonresident alien individual or a foreign estate that were treated as gifts or bequests.

A separate threshold applies to gifts from foreign corporations and partnerships, and that one is adjusted for inflation each year.

Reporting is not taxing. A gift from your British mother is not income to you, and the form simply records it.

One warning matters here. Form 3520's penalty is proportional to the amount involved rather than a flat charge, so a late form on a large gift is expensive.

The US taxes givers rather than receivers, which is the reverse of what most people expect. The IRS explains the mechanics in its gift tax questions, including the annual exclusion and when Form 709 becomes necessary.

Gifts to a spouse who is not a US citizen follow their own limit rather than the unlimited marital treatment. That catches plenty of cross-border couples.

Britain has no gift tax at all. Instead, gifts interact with inheritance tax through the seven-year rule, which is a different mechanism with a different timeline.

So a single gift can be reportable in America and irrelevant in Britain until someone dies.

Transfers move balances, and balances drive reporting. A US person whose foreign accounts together exceed $10,000 at any point in the calendar year files an FBAR.

A transfer that sits in a UK account for three days still counts, because the test looks at the highest balance rather than the year-end position.

Form 8938 runs alongside it with higher thresholds for people living abroad, and the IRS publishes a comparison of the two.

Our article on Form 8938 and the FBAR sets out which one catches what.

Here is the part that genuinely creates tax. The US measures everything in dollars, so a debt denominated in pounds changes in dollar terms as the rate moves.

Repaying or refinancing a UK mortgage can therefore produce a taxable gain, even though the pound amount never changed.

Nothing about this depends on transferring money across the Atlantic. It follows from holding a foreign currency obligation while filing in dollars.

Our article on foreign currency mortgage gains explains the calculation and when it applies.

For the transfer itself, none, because nothing about it needs reporting. For whatever the money represents, the ordinary rules apply and the rate at the time of each item governs. You convert a salary when you earn it and a gain when you realise it, regardless of when the funds later cross the Atlantic.

That distinction saves confusion. You convert income when you receive it, not when you happen to move it.

Our guide to filing from the UK sets out how those amounts reach the return.

Anti-money-laundering rules sit behind most of it, and they are separate from tax. Banks verify the source of funds because their regulator requires it, not because a tax authority asked.

Answering plainly is usually enough. A sale contract, a payslip history or a completion statement resolves the vast majority of queries.

Delays are common on large transfers, especially the first one. Build a week into any timetable that depends on the money arriving.

Expect the questions to repeat for each new corridor. A first transfer to a new account in a new country restarts the checks, however established your relationship with either bank.

Property purchases concentrate every issue in one week. A deposit arrives, an account balance spikes, a gift may fund part of it, and a mortgage in a second currency begins.

Sequence the paperwork before the money moves. Gift letters, account records and the source of each tranche are far easier to assemble in advance.

Our article on buying property in the UK covers the purchase itself, including the charges that fall due on completion.

Lenders add their own timetable to all of this. A mortgage offer often requires the deposit to be in a UK account for a set period before completion, which pushes the transfer earlier than the purchase suggests.

Yes, and the distinction matters more than the paperwork suggests. A genuine loan creates a debt rather than a gift, so no reporting threshold for gifts applies to it. However, a loan needs the features of a loan: terms, a rate of interest and some evidence that repayment is expected.

Family arrangements often lack all three. Where nothing was ever repaid and no terms existed, the substance looks like a gift.

Interest on a real loan is income to the lender, which introduces a second question. So the cheap option administratively is often the expensive one later.

Regular support payments raise the same questions as a lump sum, spread thinner. Money from a non-US relative still counts towards the annual total that drives Form 3520.

Additionally, several small transfers can cross a threshold that no single payment approaches. Totalling them once a year takes minutes and prevents the surprise.

Our article on supporting parents abroad covers the position when the money runs in the other direction.

Three columns are enough: date, amount and whose money it was. That last column does the work, because it separates your own savings from gifts and loans.

Keep the bank's confirmation and, for gifts, a short note from the giver stating what it was. A gift letter written at the time is worth far more than a recollection years later.

In practice our clients who log transfers as they happen answer every later question in one email.

Work through this before the first large transfer rather than after it.

Timing deserves a thought, though not the one people expect. Transferring money ahead of a move does not change what either country taxes, because tax followed the income rather than the funds. What it does change is which accounts hold what on 31 December, and therefore which reports fall due.

Furthermore, a large balance parked abroad before you arrive can produce interest that is taxable once you are resident.

So the planning question is rarely whether to move the money. It is which account should hold it at the year end.

The reverse journey is simpler, because the US taxes you wherever the money sits. Moving funds back to a dollar account produces no income and removes nothing from the return.

Two things do change, however. Your foreign account balances fall, which affects next year's reporting thresholds, and a pound balance converted to dollars can crystallise a currency result on the underlying position.

Consequently the account you close in December is worth a note in the file. Closed accounts still appear on the FBAR for the year they existed.

In short, keep the statements even after the account has gone.

Take an illustrative case. An American in Bristol receives £180,000 from her British father towards a house, then moves $60,000 of her own savings across to complete the purchase.

The gift is not income, though it exceeds the threshold and goes on Form 3520. Her own savings are simply hers, and the transfer is invisible for tax.

Both movements push her UK account balances well past the FBAR limit, so that filing follows. The figures are illustrative, and the pattern is one we see every spring.

First, assuming a large transfer is itself taxable and paying tax that was never due. Second, missing Form 3520 on a family gift, where the penalty is proportional.

Third, ignoring the FBAR because the money only passed through. Fourth, treating a gift from a US parent and a gift from a UK parent identically, when the reporting falls on different people.

Fifth, forgetting the mortgage. Our clients are rarely surprised by the transfer and quite often surprised by the currency behind it.

Sixth, relying on a transfer service's reassurance about tax. Those firms answer a payments question competently and have no view on your filing position, which is a different subject with different forms behind it.

We look at the whole movement rather than the transfer: whose money it was, what it funded, and which balances it touched. That is usually a twenty-minute conversation that prevents a five-figure penalty.

Our US federal return service covers the reporting forms alongside the return itself, including Form 3520 where a gift needs recording.

If money has already moved and nothing was filed, tell us the dates and amounts and we will set out the position and the way back.