The UK naturalization fee remains one of the highest in the world.  Looking back into history, the fee for filing a naturalization application has jumped from just £150 in some twenty years ago which is a 700% increase of currently prevailing prices.
| Naturalization Applications | British Citizen (£) | British Overseas Citizen (£) |
| 2003 | 150 | 150 |
| 2005 | 268 | 268 |
| 2007 | 575 | 575 |
| 2010 | 655 | 655 |
| 2014 | 906 | 661 |
| 2015 | 1005 | 740 |
| 2016 | 1236 | 925 |
| 2017 | 1282 | 962 |
| 2018 | 1330 | 1000 |
| 2019 | 1330 | 1000 |
| 2020 | 1250 | 1000 |
Source: UK Home Office
Renunciation
The Renunciation fee pretty much remained low and stable over 20 years. It only costed less than 100 pounds to renounce citizenship way back in 2003.
| Naturalization | Renunciation |
| 2003 | 81 |
| 2005 | 120 |
| 2014 | 144 |
| 2015 | 223 |
| 2016 | 272 |
| 2017 | 321 |
| 2018 | 372 |
| 2019 | 372 |
| 2020 | 372 |
UK compared with other countries
Here is a quick comparison of naturalization filing fee with other countries
United Kingdom – GBP 1250
United States – AUD 725
Canada – CAD 630
Australia – AUD 285
Switzerland – CHF 1700
Germany – €255
Ireland – €950
Spain – €100
Greece – €700
New fee for 2020
The UK home has published new fees for the 2020. The UK naturalization filing fee may well rise to £1500 post 2021.
| Fee Category | Current Fee | 2020/21 Proposed Fee | % Increase | 2020/21 Estimated Unit Cost | Maxima |
| Naturalisation (British Citizenship) | £1,250 | £1,250 | 0% | £372 | £1,500 |
| Naturalisation as a British Overseas Territories Citizen single application | £1,000 | £1,000 | 0% | £372 | £1,500 |
| Nationality (British Citizenship) Registration adult | £1,126 | £1,126 | 0% | £372 | £1,500 |
| Nationality (British Citizenship) Registration child | £1,012 | £1,012 | 0.0% | £372 | £1,500 |
| Nationality (British Overseas Territories Citizen / British Overseas Citizen / British Subject / British Protected Person) Registration adult | £901 | £901 | 0% | £372 | £1,500 |
| Nationality (British Overseas Territories Citizen / British Overseas Citizen / British Subject / British Protected Person) Registration child | £810 | £810 | 0% | £372 | £1,500 |
| Renunciation of Nationality | £372 | £372 | 0% | £372 | £400 |
