Thirty one days decides whether you can elect in early

Figures relate to tax year 2025-26 (UK) · 2025 (US)

The first year choice is an election with two arithmetic conditions, and almost everything about it turns on them. You need a block of thirty one consecutive days in America, and presence on three quarters of the days from that block to the end of the year.

Meet both and you can move your residency start date earlier than the default rules would place it. Miss either and the option simply is not there.

What makes this worth planning is that both conditions depend on travel you may still control. A trip home in the wrong week breaks the consecutive block, and nobody tells you until the return is being prepared.

Key takeaways

• The election needs 31 consecutive days of presence in America.
• It also needs presence on 75 per cent of the days to year end.
• Up to five days of absence are ignored in that second test.
• You must meet the ordinary day count in the following year.
• It moves your residency start date earlier, not to January.
• A second election is needed to cover the whole year.
• Once filed, it cannot be reversed without IRS consent.

What is the first year choice?

The first year choice lets you count as an American resident from an earlier point in your arrival year than the normal rules allow. According to IRS guidance, it applies where you were not a resident in the previous year but will be in the following one.

The point is to escape dual status filing. Starting residence earlier can let you count as resident for the whole year, which unlocks the reliefs a split year denies.

It is a choice rather than a default. Nobody applies it for you and the normal split applies unless you actively elect.

What are the conditions?

You must be present in America for at least 31 consecutive days in the year of arrival. You must also be present for at least 75 per cent of the days in the period running from the start of that 31 day block to the end of the year.

You may ignore up to five days of absence when applying the 75 per cent test. That allowance gives a little room for a trip home without breaking the calculation.

You must also meet the day counting rule in the following year. The election depends on becoming a full resident next year, so you make it looking forward.

What counts as a day of presence?

Any calendar day on which you were physically in America, including the day you arrived and the day you left. The election uses the same counting basis as the ordinary residence test.

That matters for the 31 consecutive day block, because a single day out of the country breaks the run. A weekend trip to Toronto in the middle of your qualifying period can cost you the election.

Plan any travel in that window deliberately rather than by accident.

Does it make you resident for the whole year?

Not by itself. The first year choice moves your start date to the beginning of your qualifying presence period, which may still sit months into the year. A second election is what actually covers the whole twelve months.

A separate election, open to anyone with an American or resident spouse, treats you as resident for the entire year. Advisers often use the two together.

Our guide to a nonresident alien spouse covers that second election. It is what actually delivers joint filing.

How do you actually make it?

By attaching a statement to your arrival year return, saying that you are making the first year choice and showing how you meet each condition. The statement is short, but the timing around it needs care.

There is a timing problem. You often cannot meet the following year test by the normal filing deadline, so you will usually need an extension.

File the extension before the deadline rather than after. Missing it can cost you the election entirely.

Is the election reversible?

Not without consent from the IRS, which it rarely grants. Treat it as permanent for that year once the return goes in. That finality is exactly why the modelling has to happen beforehand.

That finality is why the modelling matters. A choice made on a hunch cannot usually be unwound when the numbers turn out differently.

Keep the calculation that supported the decision. It explains the position if anyone asks later.

Does it apply to green card holders?

Rarely, because a green card makes you resident from the day you arrive holding it. The residency start date is already early, so there is nothing for the election to improve.

It matters instead to people arriving on work visas, who become resident through day counting rather than status. That is where the split year problem actually bites.

Our guide to green card holders in the UK covers the status route.

What if your spouse arrives separately?

Each person has their own residency start date and their own qualifying period, so a spouse who arrives two months later runs a completely separate calculation. Nothing about your own election carries across to them automatically.

The joint filing election can still pull everything together, because it depends on marital status rather than matching arrival dates. That is usually the simpler route for couples.

Work out each position separately first, then look at the joint election.

What if you move in December?

The 31 consecutive day requirement becomes very hard to meet, since there are not many days left in the year. A December arrival usually cannot make the election at all.

That is not necessarily bad news. With almost no American presence in the year, a dual status return covers very little income anyway.

The election matters most for arrivals between roughly June and October.

A worked example

The figures below are illustrative. They use round numbers so you can follow each step and substitute your own.

Tom and his wife move from Bristol to Boston on 1 October 2025 for his new job. She does not work. Without an election he is a dual status filer for 2025.

As a dual status filer he loses the standard deduction and cannot file jointly. America taxes his October to December income at single rates with no deduction at all.

Making the first year choice moves his residency start date to 1 October, and a further election then treats him as resident for the whole year. He files jointly and claims the full standard deduction.

The cost is that his British income from January to September enters the American calculation. Because British rates are higher, foreign tax credits usually absorb that, leaving him better off overall.

Why is dual status filing a problem?

Because it strips out several reliefs that ordinary residents take for granted. A dual status filer cannot claim the standard deduction, which for 2025 is worth around $15,000 for a single filer and roughly $30,000 for a couple.

They also cannot file jointly with a spouse, so the wider married brackets are unavailable. For a single-earner household that difference alone can be worth thousands.

Certain credits narrow as well. The combination is why the first year choice exists at all.

The two routes compared

The table sets out what each gives you. The right column is what the election buys.

When does it not help?

Where your British income before arrival was large and lightly taxed. Bringing it into the American calculation then creates real tax that credits cannot absorb. A capital gain realised before the move is the usual culprit here.

A capital gain realised before the move is the common example. Britain may have charged little or nothing, leaving a substantial American charge with no credit behind it.

Model both outcomes before electing. The answer depends entirely on the shape of your pre-arrival income.

Does it interact with the exclusion?

It can, because becoming resident earlier changes which income enters the American system and when. The foreign earned income exclusion may then cover your British salary for the months before you arrived.

You cannot claim the exclusion and the credit on the same income, so compare the two rather than combining them.

Our guide to Form 2555 and the exclusion covers the choice between them.

What about foreign account reporting?

Electing earlier residence stretches the period over which your British accounts become reportable. A full year election pulls the entire year into scope rather than only the months following your arrival in America.

For 2025 the threshold remains $10,000 across all accounts at any point in the year, so most people with British banking cross it easily.

Our guide to FBAR deadlines and penalties covers the obligation. Factor the extra reporting into the decision.

Does your UK pension get caught?

Growth inside a British pension is generally protected by the treaty whether or not you make the election, so earlier residence does not expose it. Contributions and employer payments follow their own treaty rules.

What does change is the reporting. A longer resident period means a longer window in which the pension appears on your foreign asset disclosures.

Nothing about the election changes the underlying treaty protection.

Our guide to employer pension contributions covers the treaty mechanics.

Does it affect your UK return?

Not at all. HMRC applies its own residence rules and ignores any American election, so your British position for the year of departure stays exactly as it was. The two systems split the year independently.

British split year treatment may apply separately on your side. The two countries can therefore split the same year at different dates.

Our guide to the statutory residence test covers the British analysis.

How does it affect state tax?

Not at all directly. States run their own residence rules and pay no attention to a federal election, so your state position depends entirely on when you actually arrived there.

That can create an awkward mismatch. You might be a federal resident from January under the election while the state treats you as arriving in October.

Our guide to US state tax for expats covers the state analysis.

What records should you keep?

A complete day by day record of your presence in America for the arrival year, plus evidence of your British income and the tax paid on it before you moved.

The presence record supports the 31 day and 75 per cent tests. The British income record supports the credits that make the election worthwhile.

Six years is the sensible retention period for all of it.

Keep the comparison calculation too. It shows why you chose the route you did.

How to decide

1. Establish your actual arrival date and first day of presence.
2. Check whether you have 31 consecutive days of presence.
3. Apply the 75 per cent test from that block to year end.
4. Confirm you will meet the day count next year.
5. Total your British income for the months before arrival.
6. Work out the British tax paid on it and the credit available.
7. Compare the dual status outcome against the full year one.
8. File an extension if the following year test is not yet met.

Mistakes and penalties we see with the first year choice

The first is assuming a later residency start date is always better. For a married single-earner household the lost deduction and joint rates usually outweigh the extra income.

The second is making the election without modelling the pre-arrival income. A lightly taxed British gain can turn a saving into a cost.

The third is missing the extension. The following year test often cannot be met by April, and the election goes with the deadline.

The fourth is forgetting the extra foreign account reporting that earlier residence brings. The penalties there are per account per year.

How US UK Tax Accountants helps

We model both outcomes on your actual numbers before you file anything, because the right answer depends entirely on your pre-arrival income and your marital position. Then we file the statement and the extension correctly.

Where the election does not help, we prepare the dual status return properly instead. Our US federal return service covers both routes.

If you are moving to America this year, get in touch before December. The election depends on presence patterns you can still influence.

Last reviewed 11 October 2026. This article is general information and not personal tax advice. Every move turns on its own facts, so take advice on yours before electing.