British citizenship and naturalisation

Most applications turn on two things: the residence calculation, and good character. The second has changed significantly and the change is not widely understood.

The requirements

For naturalisation as a British citizen, in outline:

Residence. Usually five years in the UK, with indefinite leave to remain or settled status held for the final twelve months. For spouses of British citizens, three years, and the twelve-month wait does not apply.

Absences. Within the permitted limits across the qualifying period and in the final twelve months. Discretion exists but is not to be relied on.

Life in the UK test and English language at the required level.

Good character.

Intention to continue living in the UK, on most routes.

Good character — what changed

This is the part that now defeats applications that would previously have succeeded.

From 10 February 2025, Home Office guidance directed that a person who entered or arrived in the UK illegally would normally be refused citizenship — regardless of how long ago the entry occurred. That was a significant departure from the previous approach, which generally assessed conduct over a limited recent period rather than treating a historic irregular arrival as a permanent bar.

Revised guidance took effect on 30 April 2026, which the Home Office described as technical clarification rather than a change of substance. It does, however, set out exceptions more clearly.

Where the entry was outside the person’s control — the guidance cites children and victims of trafficking who could not reasonably be held responsible — it will usually be appropriate to disregard it.

Article 31 of the Refugee Convention is addressed expressly: a refugee with a valid legal defence for how they entered must not be refused citizenship on that basis alone.

If you have been refused on good character grounds, or you are holding off applying because of a historic entry, the exceptions are worth taking advice on. A refusal in 2025 does not necessarily mean a refusal now, and the way an application is framed makes a material difference.

Good character beyond entry

It is a broad assessment covering criminal convictions and cautions, including motoring matters; civil judgments and bankruptcy; financial soundness, including tax and National Insurance compliance; immigration history — overstaying, breaches of conditions, deception; and non-disclosure in earlier applications, which is treated seriously.

The most damaging category is deception, including in applications made years before, and including matters the applicant did not regard as deception at the time.

Disclose everything. A minor matter disclosed is usually survivable. The same matter discovered is frequently not, because non-disclosure becomes the issue.

Where applications go wrong

Absences miscounted, particularly in the final twelve months, where the limit is tighter.

Applying too early — before the twelve months with ILR, or before the residence period is complete.

Referees who do not meet the requirements.

Unpaid tax or unfiled returns, especially for the self-employed.

A historic matter not disclosed because the applicant thought it irrelevant.

What we do

Review your history before you apply — residence, absences, and anything that engages good character. Advise honestly on whether to apply now, apply with an explanation, or wait. Prepare the application. And where an application has been refused, advise on reconsideration, a fresh application, or judicial review.

For anyone with a complicated history, the pre-application review is the point at which the outcome is decided.

What it costs

A fixed fee, quoted before we begin. Where there is a good character issue or a complex residence history, we quote separately — it is a different piece of work. Home Office fees and the citizenship ceremony fee are additional.

Questions

Questions people ask us

I entered the UK illegally many years ago. Can I ever naturalise?

Possibly. Since February 2025 illegal entry has normally led to refusal, but the guidance revised on 30 April 2026 sets out exceptions — including where entry was outside your control, and where a refugee has a valid Article 31 defence. How the application is framed matters a great deal. Take advice rather than assuming either way.

I was refused on good character grounds. Can I reapply?

Often yes. There is no statutory bar on reapplying, and the guidance has been revised since many refusals were issued. Whether to reapply, and when, depends on the reason given — send us the refusal letter.

Do I have to wait twelve months after getting ILR?

Generally yes, unless you are the spouse or civil partner of a British citizen, in which case the twelve-month wait does not apply.

How many days can I have been outside the UK?

There are limits across the qualifying period and a tighter limit in the final twelve months. Discretion exists but should not be planned around. Count properly before applying.

I have unpaid tax. Does that affect good character?

It can. Financial soundness, including tax compliance, forms part of the assessment. Resolving it before applying is usually better than explaining it afterwards.

Does a caution or a speeding fine matter?

It depends on what and when. Many minor matters do not prevent naturalisation, but all of them should be disclosed — non-disclosure is treated far more seriously than the underlying matter usually is.

The hub

Immigration →

Also in this area

Skilled Worker visa →

Also in this area

Global Talent visa →

Start with a conversation

A free 20-minute call. Tell us what has happened and we will tell you whether we can help, what it would involve and roughly what it would cost.

No charge

A free 20-minute call

Tell us what has happened and we will tell you whether we can help, what it would involve and roughly what it would cost. No advice is given on this call and there is no charge for it.

£350 plus VAT

A paid strategy session

One hour with a partner, followed by a written summary of your position and options. For people who want proper advice without instructing a firm yet. Credited in full against your fees if you go on to instruct us.

Or reach us directly

0207 112 8818

WhatsApp +44 7476 045967

[email protected]

We answer enquiries the same working day.