The foreign tax credit carryover nobody tracks

Foreign tax you paid that your US return could not use this year. The US tax on the same income caps the credit, so where the foreign tax is higher the excess has nowhere to go. It carries instead of lapsing.

One year back and ten years forward. IRS Topic 856 sets the limit for unused foreign tax at a single year behind you and a decade ahead. That order is fixed, so a surplus looks backwards before it starts moving forwards.

So the first move is backwards, into the prior year.

Only then does the remainder run forward.

Ten years is long enough that most people forget it exists well before it expires.

Because British tax on the same income frequently exceeds the American tax. The credit can only wipe out the US liability, so the surplus has nowhere to land in that year.

Higher earners see this most.

So do people with large one-off UK liabilities, such as a bonus year.

In short, the carryover is a by-product of paying more tax in Britain than America charges on the same income.

Yes, and that order is not a matter of choice. Topic 856 puts the one-year carryback first and the ten-year carryforward second, so a surplus goes back a year before it starts running forward. In practice that means amending the earlier return, which is why many people never bother.

However, the amendment can pay for itself. A refund from an earlier year arrives as cash, rather than as a credit you may never use.

The decision turns on that earlier year. If American tax then already soaked up its own credits, the carryback achieves nothing and the surplus moves forward instead.

So ask the question once, in the year the surplus arises. By the time a balance is five years old, nobody wants to reopen the paperwork.

It is worth whatever US tax it later offsets. So its value depends on having a future year where American tax exceeds the credit generated in that year. That happens more often than people expect.

A year back in the United States is the obvious case.

So is a year with US-source income, or a year where UK tax falls while American income does not.

So put a figure on it before deciding what it deserves. A small surplus expiring in two years is a different proposition from a large one with eight years still to run.

On Schedule B of Form 1116, which the IRS calls the Foreign Tax Carryover Reconciliation Schedule. It exists for exactly this problem. The schedule reconciles the balance from one year to the next, so the number has a home on the return rather than living in a preparer's working papers.

Ask for that schedule by name. It is the one page showing where the balance came from and how much remains in each category.

Also check that it runs through every year. A single gap in the reconciliation is how a ten-year balance quietly becomes a five-year one.

So the schedule is the record. Schedule B is worth a look even where somebody else completes it.

Because it lives on a schedule rather than in an account. Nobody sends a statement. No bank shows a balance. It exists only because a preparer carried it from one return to the next.

Change preparer and the chain can break.

A new adviser who never receives the prior schedules cannot use what they cannot see.

In our practice this is the single most common piece of value lost when people move firms.

The prior returns as filed, and the schedules behind them. For this purpose the carryover schedule matters more than almost anything else, because nobody can reconstruct it from memory. Ask for it by name.

A return copy alone may not show the detail.

Our guide to choosing accountants for US and UK tax lists what else to take with you.

Yes, and the choice is annual. Topic 856 allows a deduction for eligible foreign taxes in place of the credit, and it requires the same treatment for every foreign tax you paid in the year.

So it is all or nothing within a year.

A deduction reduces taxable income rather than tax, so it is usually worth less.

However, it can suit a year where no credit would be usable at all, and the IRS sets out the choice.

Considerably, and this is where a carryover gets given up without anyone noticing. Excluding foreign earned income removes that income from the American calculation, and the foreign tax paid on it goes with it.

So no credit arises on the excluded slice.

No credit means no surplus and no carryover.

Our comparison of the exclusion and the foreign tax credit works through the choice, and the IRS explains the exclusion.

No, and this limits how usable a carryover is. The credit works within categories of income, so a surplus in one category does not touch American tax in another, however large the balance looks on paper.

That is why a large carryover sometimes sits unused for years.

The income it could offset never arrives in the right category.

So the headline number can overstate what you will actually recover, and Form 1116 is where you work the categories out.

That is the moment the carryover becomes useful. US-source income generates American tax with no foreign tax to credit against it, so a stored surplus can finally do some work. The timing matters though.

The clock runs from the year the credit arose.

So somebody who spent twelve years abroad may find the earliest slices have already expired.

That gets complicated, and it is worth advice rather than assumption. A carryover lives on a return, so years with no return leave gaps in the chain. Catching up on filings can restore the picture.

Our guide to the Streamlined routes covers what catching up involves.

Either way, deal with the unfiled years before you rely on the carryover.

Write it down somewhere that is not a tax return. A single sheet listing the year, the amount and the category survives changes of adviser, software and country. Keep it with your basis records.

Both are long-lived numbers that nobody else stores for you.

Our guide to tax records sets out what else belongs in that file.

Also note the year each slice arose. Expiry runs from that year, so the list only helps you if it carries dates as well as amounts.

A short routine that keeps the number alive.

Less, but not none. Someone who stays in Britain permanently may still have years where American tax exceeds the credit generated that year. US-source income is the usual trigger. So is a year where the exclusion is not used and the income mix shifts.

However, for a settled expatriate the honest answer is that much of a large carryover will never do any work.

In effect yes, by using the exclusion instead of the credit where that suits your position better. That trade is the real decision underneath the carryover question. A carryover you will never use is worth nothing.

So building one is not automatically a good outcome.

In short, the choice should rest on what you expect the next few years to look like.

Find the schedule, read the numbers, and write them down somewhere outside your tax software. That takes an hour and protects a balance that can run to thousands. Then check the oldest slice.

If it expires within a year or two, that is worth knowing before the window closes.

So the task is bookkeeping rather than tax planning, and it is the kind that quietly pays for itself.

Consider an American in London paying UK tax at a higher rate than her US liability for six years running. Each year the credit covers the American tax and leaves a surplus.

By the time she returns to Boston the carryover is substantial. Her new preparer asks for prior returns, gets them, and uses the stored credit against US-source income.

Had she switched advisers twice in Britain without passing the schedules along, the number would simply have stopped existing.

These figures are illustrative. The mechanism, though, is ordinary, and so is the way it gets lost.

The first treats the carryover as automatic. It only exists if somebody carries it.

The second changes adviser without collecting the schedules, which ends the chain quietly.

The third assumes any future US tax can use it. Categories limit where it can go.

The fourth claims the exclusion without checking which credit it gives up in exchange.

We track the schedule between years, so the number survives changes of software and of adviser.

We also model the exclusion against the credit before the first return, because that choice decides whether a carryover arises at all.

Our US federal returns service covers the filing, and fees stay fixed and agreed in writing. How we work sets out the process.

If you are switching firms, talk to us before the old one closes your file.